Measurement of $\ddot{I}{‡}_{cJ}$ decaying into $\hat{I}{\cdot }^{\prime }{K}^{+}{K}^{-}$

BESIII Collaboration, M. Ablikim, M. N. Achasov +376

Using $(106.41\pm 0.86)\times 10^6$ $\ddot{I}ˆ(3686)$ events collected with the BESIII detector at BEPCII, we study for the first time the decay $\ddot{I}{‡}_{cJ}\to \hat{I}{\cdot }^{\prime }{K}^{+}{K}^{-}$, where $η'\toγυ

Measurement of the $D\to K^{-}\ddot{I}{€}^{+}\ddot{I}{€}^{+}\ddot{I}{€}^{-}$ and $D\to K^{-}\ddot{I}{€}^{+}\ddot{I}{€}^0$ coherence factors and average strong-phase differences in quantum-correlated $D\bar{D}$ decays

BESIII Collaboration, M. Ablikim, M. N. Achasov +505

The decays $D\to K^{-}\ddot{I}{€}^{+}\ddot{I}{€}^{+}\ddot{I}{€}^{-}$ and $D\to K^{-}\ddot{I}{€}^{+}\ddot{I}{€}^0$ are studied in a sample of quantum-correlated $D\bar{D}$ pairs produced through the process $e^+e^- \to ψ(3770) \to D\bar…

Improved measurement of the decays $\hat{I}{\cdot }^{\prime }\to \ddot{I}{€}^{+}\ddot{I}{€}^{-}\ddot{I}{€}^{+(0)}\ddot{I}{€}^{-(0)}$ and search for the rare decay $\hat{I}{\cdot }^{\prime }\to 4\ddot{I}{€}^0$

BESIII Collaboration, M. Ablikim, M. N. Achasov +617

Using a sample of 10 billion $J/\ddot{I}ˆ$ events collected with the BESIII detector, the decays $\hat{I}{\cdot }^{\prime }\to \ddot{I}{€}^{+}\ddot{I}{€}^{-}\ddot{I}{€}^{+}\ddot{I}{€}^{-}$, $\hat{I}{\cdot }^{\prime }\to \ddot{I}{€}^{+}\ddot{I}{€}^{-}\ddot{I}{€}^0\ddot{I}{€}^0$ and $η' \to 4 π^{…

Search for $K_S^0$ invisible decays

BESIII Collaboration, M. Ablikim, M. N. Achasov +650

Based on $(1.0087\pm 0.0044)\times 10^{10}$ $J/\ddot{I}ˆ$ events collected with the BESIII detector at the BEPCII $e^{+}{e}^{-}$ storage ring, we search for $K_S^0$ invisible decays via the $…

Observation of $\ddot{I}ˆ(3686)\to 3\ddot{I}•$

BESIII Collaboration, M. Ablikim, M. N. Achasov +651

Using $(2.712\pm 0.014)\times 10^9$ $\ddot{I}ˆ(3686)$ events collected by the BESIII detector operating at the BEPCII collider, we report the first observation of $\ddot{I}ˆ(3686)\to 3\ddot{I}•$ decay w…

Search for the semileptonic decays $D_s^{+}\to K_1(1270{)}^0{e}^{+}\hat{I}{½}_e$ and $D_s^{+}\to b_1(1235{)}^0{e}^{+}\hat{I}{½}_e$

BESIII Collaboration, M. Ablikim, M. N. Achasov +611

By analyzing 7.33\,fb${}^{-1}$ of $e^{+}{e}^{-}$ collision data collected at center-of-mass energies between 4.128 and 4.226 GeV with the BESIII detector, we search for the semileptonic de…

Updated model-independent measurement of the strong-phase differences between $D^0$ and ${\bar{D}}^0\to K_{S/L}^0\ddot{I}{€}^{+}\ddot{I}{€}^{-}$ decays

BESIII Collaboration, M. Ablikim, M. N. Achasov +688

The strong-phase differences between $D^0\to K_{S/L}^0\ddot{I}{€}^{+}\ddot{I}{€}^{-}$ and ${\bar{D}}^0\to K_{S/L}^0\ddot{I}{€}^{+}\ddot{I}{€}^{-}$ decays are one of the most important inputs in measuring the $CP$ violating a…

Measurement of the Integrated Luminosities of Cross-section Scan Data Samples Around the $\ddot{I}ˆ(3770)$ Mass Region

M. Ablikim, M. N. Achasov, S. Ahmed +460

To investigate the nature of the $\ddot{I}ˆ(3770)$ resonance and to measure the cross section for $e^{+}{e}^{-}\to D\bar{D}$, a cross-section scan data sample, distributed among 41 center-of-m…

Measurement of the Branching Fraction For the Semi-Leptonic Decays $D^{0(+)}\to \ddot{I}{€}^{-(0)}\hat{I}{¼}^{+}\hat{I}{½}_{\hat{I}}¼$ and Test of Lepton Flavor Universality

M. Ablikim, M. N. Achasov, S. Ahmed +432

Using a data sample corresponding to an integrated luminosity of $2.93\mathrm{f}{\mathrm{b}}^{-1}$ taken at a center-of-mass energy of 3.773\,GeV with the BESIII detector operated at the BEPCII…

Observation of $\ddot{I}ˆ(3686)\to K^{-}\hat{I}›(1520)\bar{\hat{I}}{ž}^{+}+c.c.$

BESIII Collaboration, M. Ablikim, M. N. Achasov +650

Based on $(2712.4\pm 14.3)\times 10^6$ $\ddot{I}ˆ(3686)$ events collected at the BESIII detector operating at the BEPCII collider, we present the first observation of the decay $ψ(3686)…

Search for $D^0\to {\hat{I}}^3{\hat{I}}^3$ and improved measurement of the branching fraction for $D^0\to \ddot{I}{€}^0\ddot{I}{€}^0$

BESIII Collaboration, M. Ablikim, M. N. Achasov +412

Using $2.92$ fb${}^{-1}$ of electron-positron annihilation data collected at $\sqrt{s}=3.773$~GeV with the BESIII detector, we report the results of a search for the flavor-changin…

Non-singlet structure functions: Combining the leading logarithms resummation at small-x with DGLAP

B. I. Ermolaev, M. Greco, S. I. Troyan

The explicit expressions for the non-singlet DIS structure functions obtained at small x by resumming the most singular logarithmic contributions are discussed and compared in deta…

Cross section measurements of $e^{+}{e}^{-}\to \ddot{I}‰\ddot{I}{‡}_{c0}$ from $\sqrt{s}=$4.178 to 4.278 GeV

M. Ablikim, M. N. Achasov, P. Adlarson +474

The cross section of the process $e^{+}{e}^{-}\to \ddot{I}‰\ddot{I}{‡}_{c0}$ is measured at center-of-mass energies from $\sqrt{s}=$ 4.178 to 4.278 GeV using a data sample of 7 fb${}^{-1}$ colle…

Measurement of the Cross Section for $e^{+}{e}^{-}\to$ hadrons at Energies from 2.2324 to 3.6710 GeV

BESIII Collaboration, M. Ablikim, M. N. Achasov +557

Based on electron-positron collision data collected with the BESIII detector operating at the Beijing Electron Positron Collider II storage rings, the value of $R\equivσ(e^{+}e^{-…

First Observation of the Semileptonic Decay $\hat{I}{›}_c^{+}\to p{K}^{-}{e}^{+}\hat{I}{½}_e$

BESIII Collaboration, M. Ablikim, M. N. Achasov +563

Using $4.5{\mathrm{fb}}^{-1}$ of $e^{+}{e}^{-}$ annihilation data samples collected at the center-of-mass energies ranging from 4.600~GeV to 4.699~GeV with the BESIII detector at the BEPC…

Determination of Spin-parity Quantum Numbers for the Narrow Structure Near the $p\bar{\hat{I}}›$ Threshold in $e^{+}{e}^{-}\to p{K}^{-}\bar{\hat{I}}›+c.c.$

BESIII Collaboration, M. Ablikim, M. N. Achasov +593

A narrow structure in the $p\bar{\hat{I}}›$ system near the mass threshold, named as $X(2085)$, is observed in the process $e^{+}{e}^{-}\to p{K}^{-}\bar{\hat{I}}›$ with a statistical significance greater…

Observation of an Altered $a_0(980)$ Line shape in $D^{+}\to \ddot{I}{€}^{+}\hat{I}\cdot \hat{I}\cdot$

BESIII Collaboration, M. Ablikim, M. N. Achasov +693

Using $20.3{\mathrm{fb}}^{-1}$ of $e^{+}{e}^{-}$ collision data collected with the BESIII detector at $\sqrt{s}=3.773\mathrm{GeV}$, we perform the first amplitude analysis of the decay $D^+\to…

Observation of $D^{+}\to K_S^0{a}_0(980{)}^{+}$ in the amplitude analysis of $D^{+}\to K_S^0\ddot{I}{€}^{+}\hat{I}\cdot$

BESIII Collaboration, M. Ablikim, M. N. Achasov +615

We perform for the first time an amplitude analysis of the decay $D^{+}\to K_S^0\ddot{I}{€}^{+}\hat{I}\cdot$ and report the observation of the decay $D^{+}\to K_S^0{a}_0(980{)}^{+}$ using 2.93 fb…

First Measurement of the Relative Phase between Proton Psionic Form Factors

BESIII Collaboration, M. Ablikim, M. N. Achasov +754

The relative phase between the time-like form factors of the proton is a crucial observable for a complete understanding of its internal structure, yet it has remained unmeasured d…

Future Physics Programme of BESIII

M. Ablikim, M. N. Achasov, P. Adlarson +482

There has recently been a dramatic renewal of interest in the subjects of hadron spectroscopy and charm physics. This renaissance has been driven in part by the discovery of a plet…

Experimental access to Transition Distribution Amplitudes with the PANDA experiment at FAIR

PANDA Collaboration, B. P. Singh, W. Erni +532

Baryon-to-meson Transition Distribution Amplitudes (TDAs) encoding valuable new information on hadron structure appear as building blocks in the collinear factorized description fo…

Amplitude analysis and branching fraction measurement of $D_s^{+}\to K^{+}{K}^{-}\ddot{I}{€}^{+}$

BESIII Collaboration, M. Ablikim, M. N. Achasov +484

We report an amplitude analysis and branching fraction measurement of $D_s^{+}\to K^{+}{K}^{-}\ddot{I}{€}^{+}$ decay using a data sample of 3.19 $\mathrm{f}{\mathrm{b}}^{-1}$ recorded with BESIII…

First measurements of the branching fractions of $J/\ddot{I}ˆ\to \hat{I}{ž}^0\bar{\hat{I}}›K_S^0+c.c.$, $J/\ddot{I}ˆ\to \hat{I}{ž}^0\bar{\hat{I}}{\pounds }^0{K}_S^0+c.c.$, and $J/\ddot{I}ˆ\to \hat{I}{ž}^0\bar{\hat{I}}{\pounds }^{-}{K}^{+}+c.c.$

BESIII Collaboration, M. Ablikim, M. N. Achasov +686

By analyzing $(10087\pm 44)\times 10^6$ $J/\ddot{I}ˆ$ events collected with the BESIII detector at the BEPCII, the decays $J/\ddot{I}ˆ\to \hat{I}{ž}^0\bar{\hat{I}}›K_S^0+c.c.$, $J/\ddot{I}ˆ\to \hat{I}{ž}^0\bar{\hat{I}}{\pounds }^0{K}_S^0+c.c.$…

Observation of the $J/\ddot{I}ˆ$ and $\ddot{I}ˆ(3686)$ decays into $\hat{I}\cdot \hat{I}{\pounds }^{+}\bar{\hat{I}}{\pounds }^{-}$

BESIII Collaboration, M. Ablikim, M. N. Achasov +572

The decays $J/\ddot{I}ˆ\to \hat{I}\cdot \hat{I}{\pounds }^{+}\bar{\hat{I}}\pounds {}^{-}$ and $\ddot{I}ˆ(3686)\to \hat{I}\cdot \hat{I}{\pounds }^{+}\bar{\hat{I}}\pounds {}^{-}$ are observed for the first time, using $(10087\pm 44)\times 10^6$ $J/\ddot{I}ˆ$ and $(448.1 \pm 2.9)\times 10…

First Observation of a Three-Resonance Structure in $e^{+}{e}^{-}\to$Nonopen Charm Hadrons

BESIII Collaboration, M. Ablikim, M. N. Achasov +619

We report the measurement of the inclusive cross sections for $e^{+}{e}^{-}$$\to$nOCH (where nOCH denotes non-open charm hadrons) with improved precision at center-of-mass (c.m.)…

Measurement of $e^{+}{e}^{-}\to \ddot{I}•\ddot{I}{€}^{+}\ddot{I}{€}^{-}$ cross sections at center-of-mass energies from 2.00 to 3.08 GeV

BESIII Collaboration, M. Ablikim, M. N. Achasov +600

Using data corresponding to an integrated luminosity of $651{\mathrm{pb}}^{-1}$ accumulated at 22 center-of-mass energies from 2.00 to 3.08 GeV by the BESIII experiment, the process…

Observation of $D\to {\bar{K}}_1(1270)\hat{I}{¼}^{+}\hat{I}{½}_{\hat{I}}¼$ and test of lepton flavor universality with $D\to {\bar{K}}_1(1270){\ell }^{+}\hat{I}{½}_{\ell }$

BESIII Collaboration, M. Ablikim, M. N. Achasov +651

By analyzing 7.93 $\mathrm{f}{\mathrm{b}}^{-1}$ of $e^{+}{e}^{-}$ collision data collected at the center-of-mass energy of 3.773 GeV with the BESIII detector operated at the BEPCII collider, we report t…

Test of lepton universality and measurement of the form factors of $D^0\to K^{\ast }(892{)}^{-}\hat{I}{¼}^{+}\hat{I}{½}_{\hat{I}}¼$

BESIII Collaboration, M. Ablikim, M. N. Achasov +643

We report a first study of the semileptonic decay $D^0\to K^{-}\ddot{I}{€}^0\hat{I}{¼}^{+}\hat{I}{½}_{\hat{I}}¼$ by analyzing an $e^{+}{e}^{-}$ annihilation data sample of $7.9{\mathrm{fb}}^{-1}$ collected at the c…

Precise measurement of the form factors in $D^0\to K^{\ast }(892{)}^{-}\hat{I}{¼}^{+}\hat{I}{½}_{\hat{I}}¼$ and test of lepton universality with $D^0\to K^{\ast }(892{)}^{-}{\ell }^{+}\hat{I}{½}_{\ell }$ decays

BESIII Collaboration, M. Ablikim, M. N. Achasov +688

We report a study of the semileptonic decay $D^0\to {\bar{K}}^0\ddot{I}{€}^{-}\hat{I}{¼}^{+}\hat{I}{½}_{\hat{I}}¼$ based on a sample of $7.9{\mathrm{fb}}^{-1}$ of $e^{+}{e}^{-}$ annihilation data collected at a center…

Search for a massless dark photon in $Λ^{+}_{c}\to p γ^{\prime}$ decay

BESIII Collaboration, M. Ablikim, M. N. Achasov +569

A search for a massless dark photon $γ^{\prime}$ is conducted using 4.5 ${\mathrm{fb}}^{-1}$ of $e^{+}{e}^{-}$ collision data collected at center-of-mass energies between 4.600 and 4.699…

Study of $\ddot{I}{‡}_{cJ}$ decaying into $\ddot{I}•$ $K^{\ast }(892)$ $\bar{K}$

M. Ablikim, M. N. Achasov, X. C. Ai +409

Using a data sample of 106 million $\ddot{I}ˆ(3686)$ events collected with the BESIII detector operated at the BEPCII storage ring, we study for the first time the decay $χ_{cJ}\toϕK^{0…

Study of $e^{+}{e}^{-}\to \ddot{I}‰\ddot{I}{‡}_{cJ}$ at center-of-mass energies from 4.21 to 4.42 GeV

BESIII Collaboration, M. Ablikim, M. N. Achasov +405

Based on data samples collected with the BESIII detector at the BEPCII collider at 9 center-of-mass energies from 4.21 to 4.42 GeV, we search for the production of $e^+e^-\to ωχ_…

J/psi Production via Fragmentation at the Tevatron

M. Cacciari, M. Greco

The production of $\jpsi$ at large transverse momenta ($\pt > M_\jpsi$) in $p\bar{p}$ collisions is considered by including the mechanism of fragmentation. Both contributions of fra…

Search for rare decay $J/\ddot{I}ˆ\to \ddot{I}•e^{+}{e}^{-}$

BESIII Collaboration, M. Ablikim, M. N. Achasov +462

Using a data sample of $448.1\times 10^6$ $\ddot{I}ˆ(3686)$ events collected at $\sqrt{s}=$ 3.686 GeV with the BESIII detector at the BEPCII, we search for the rare decay $J/ψ\to ϕe^+ e^…

Measurement of branching fractions of $\hat{I}{›}_c^{+}$ decays to $\hat{I}{\pounds }^{+}{K}^{+}{K}^{-}$, $\hat{I}{\pounds }^{+}\ddot{I}•$ and $\hat{I}{\pounds }^{+}{K}^{+}\ddot{I}{€}^{-}(\ddot{I}{€}^0)$

BESIII Collaboration, M. Ablikim, M. N. Achasov +612

Based on 4.5 fb${}^{-1}$ data taken at seven center-of-mass energies ranging from 4.600 to 4.699 GeV with the BESIII detector at the BEPCII collider, we measure the branching fractio…

Determination of strong-phase parameters in $D\to K_{S,L}^0\ddot{I}{€}^{+}\ddot{I}{€}^{-}$

M. Ablikim, M. N. Achasov, P. Adlarson +483

We report the most precise measurements to date of the strong-phase parameters between $D^0$ and ${\bar{D}}^0$ decays to $K_{S,L}^0\ddot{I}{€}^{+}\ddot{I}{€}^{-}$ using a sample of 2.93 fb${}^{-1}$ of $e^+e…

Observation of Three Resonant Structures in the Cross Section of $e^{+}{e}^{-}\to \ddot{I}{€}^{+}\ddot{I}{€}^{-}{h}_c$

BESIII Collaboration, M. Ablikim, M. N. Achasov +688

Using $e^{+}{e}^{-}$ collision data collected with the BESIII detector operating at the Beijing Electron Positron Collider, the cross section of $e^{+}{e}^{-}\to \ddot{I}{€}^{+}\ddot{I}{€}^{-}{h}_c$ is measured at 5…

First measurement of polarizations in the decay $D^0\to \ddot{I}‰\ddot{I}•$

BESIII Collaboration, M. Ablikim, M. N. Achasov +502

Using a data sample corresponding to an integrated luminosity of 2.93 fb${}^{-1}$ collected at a center-of-mass energy $\sqrt{s}=3.773$ GeV by the BESIII detector, the decay $D^0 \to…

Measurement of the $D\to K^{-}\ddot{I}{€}^{+}$ strong phase difference in $\ddot{I}ˆ(3770)\to D^0\overline{D}{}^0$

BESIII Collaboration, M. Ablikim, M. N. Achasov +381

We study $D^0\overline{D}{}^0$ pairs produced in $e^{+}{e}^{-}$ collisions at $\sqrt{s}=3.773$ GeV using a data sample of 2.92 fb${}^{-1}$ collected with the BESIII detector. We measure th…

Measurement of higher-order multipole amplitudes in $\ddot{I}ˆ(3686)\to {\hat{I}}^3\ddot{I}{‡}_{c1,2}$ with $\ddot{I}{‡}_{c1,2}\to {\hat{I}}^{3}J/\ddot{I}ˆ$ and search for the transition $\hat{I}{\cdot }_c(2S)\to {\hat{I}}^{3}J/\ddot{I}ˆ$

M. Ablikim, M. N. Achasov, X. C. Ai +424

Using 106~million $\ddot{I}ˆ(3686)$ events collected with the BESIII detector, we measure multipole amplitudes for the decay $\ddot{I}ˆ(3686)\to {\hat{I}}^3\ddot{I}{‡}_{c1,2}\to {\hat{I}}^3{\hat{I}}^{3}J/\ddot{I}ˆ$ beyond the dominan…

Experimental study of the reaction $\hat{I}{ž}^{0}n\to \hat{I}›\hat{I}›X$ using $\hat{I}{ž}^0$-nucleus scattering

BESIII Collaboration, M. Ablikim, M. N. Achasov +703

Using $(10087\pm 44)\times 10^6$$J/\ddot{I}ˆ$ events collected with the BESIII detector operating at the BEPCII storage ring in $2009$, $2012$, $2018$, and $2019$, we perform a search for…

Evidence for $Z_c^{\pm }$ decays into the $\ddot{I}{}^{\pm }\hat{I}{\cdot }_c$ final state

M. Ablikim, M. N. Achasov, S. Ahmed +458

We study $e^{+}{e}^{-}$ collisions with a $\ddot{I}{€}^{+}\ddot{I}{€}^{-}\ddot{I}{€}^0\hat{I}{\cdot }_c$ final state using data samples collected with the BESIII detector at center-of-mass energies $\sqrt{s}=4.226$, $4…

Search for the lepton number violation decay $\ddot{I}•\to \ddot{I}{€}^{+}\ddot{I}{€}^{+}{e}^{-}{e}^{-}$ via $J/\ddot{I}ˆ\to \ddot{I}•\hat{I}\cdot$

BESIII Collaboration, M. Ablikim, M. N. Achasov +596

Using $(1.0087\pm 0.0044)\times 10^{10}$ $J/\ddot{I}ˆ$ events collected by the BESIII detector at the BEPCII collider, we search for the lepton number violation decay $ϕ\to π^+ π^+ e^- e…

Observation of $e^{+}{e}^{-}\to \hat{I}\cdot Y(2175)$ at center-of-mass energies above 3.7$\sim$GeV

M. Ablikim, M. N. Achasov, S. Ahmed +426

The state $Y(2175)$ is observed in the process $e^{+}{e}^{-}\to \hat{I}\cdot Y(2175)$ at center-of-mass energies between 3.7 and 4.6$\sim$GeV with a statistical significance larger than $10\ddot{I}ƒ$ us…

Search for $\ddot{I}ˆ(3686)\to {\hat{I}}^3\hat{I}{\cdot }_c(\hat{I}\cdot (1405))\to {\hat{I}}^3\ddot{I}{€}^{+}\ddot{I}{€}^{-}\ddot{I}{€}^0$

BESIII collaboration, M. Ablikim, M. N. Achasov +438

Using a sample of $448.1\times 10^6$ $\ddot{I}ˆ(3686)$ events collected with the BESIII detector, a search for the isospin violating decay $\hat{I}{\cdot }_c\to \ddot{I}{€}^{+}\ddot{I}{€}^{-}\ddot{I}{€}^0$ via $ψ(3686)\toÎ…

Search for hyperon $\hat{I}”S=\hat{I}”Q$ violating decay $\hat{I}{ž}^0\to \hat{I}{\pounds }^{-}{e}^{+}\hat{I}{½}_e$

BESIII Collaboration, M. Ablikim, M. N. Achasov +566

Using a data sample of $(1.0087\pm 0.0044)\times 10^{10}$ $J/\ddot{I}ˆ$ decay events collected with the BESIII detector at the center-of-mass energy of $\sqrt{s}=3.097$ GeV, we present a se…

Search for $\bar{\hat{I}}›$-$\hat{I}›$ oscillations in the decay $J/\ddot{I}ˆ\to p{K}^{-}\bar{\hat{I}}›+c.c.$

BESIII Collaboration, M. Ablikim, M. N. Achasov +454

We report the first search for $\bar{\hat{I}}›$--$\hat{I}›$ oscillations in the decay $J/\ddot{I}ˆ\to p{K}^{-}\bar{\hat{I}}›+c.c.$ by analyzing $1.31\times 10^9$ $J/\ddot{I}ˆ$ events accumulated with the BESIII detect…

Measurement of the integrated luminosity and the center-of-mass energy of the data taken by BESIII at $\sqrt{s}=2.125$ GeV

BESIII Collaboration, M. Ablikim, M. N. Achasov +322

To study the nature of the state $Y(2175)$, a dedicated data set of $e^{+}{e}^{-}$ collision data was collected at the center-of-mass energy of 2.125 GeV with the BESIII detector at the…

Observation of Three Charmoniumlike States with $J^{PC}=1^{--}$ in $e^{+}{e}^{-}\to D^{\ast 0}{D}^{\ast -}\ddot{I}{€}^{+}$

BESIII Collaboration, M. Ablikim, M. N. Achasov +593

The Born cross sections of the process $e^{+}{e}^{-}\to D^{\ast 0}{D}^{\ast -}\ddot{I}{€}^{+}$ at center-of-mass energies from 4.189 to 4.951 GeV are measured for the first time. The data samples used…

Observation of the Anomalous Shape of $X(1840)$ in $J/\ddot{I}ˆ\to {\hat{I}}^{3}3(\ddot{I}{€}^{+}\ddot{I}{€}^{-})$ Indicating a Second Resonance Near $p\bar{p}$ Threshold

BESIII Collaboration, M. Ablikim, M. N. Achasov +615

Using a sample of $(10087\pm 44)\times 10^6$ $J/\ddot{I}ˆ$ events, which is about 45 times larger than that was previously analyzed, a further investigation on the $J/ψ\rightarrow γ3(π^…

Measurements of Differential Cross Sections of Inclusive $\ddot{I}{€}^0$ and $K_S^0$ Production in $e^{+}{e}^{-}$ Annihilation at Energies from 2.2324 to 3.6710 GeV

BESIII Collaboration, M. Ablikim, M. N. Achasov +572

Based on electron positron collision data collected with the BESIII detector operating at the BEPCII storage rings, the differential cross sections of inclusive $\ddot{I}{€}^0$ and $K_S^0$…

Determination of the number of $J/\ddot{I}ˆ$ events with inclusive $J/\ddot{I}ˆ$ decays

M. Ablikim, M. N. Achasov, X. C. Ai +405

A measurement of the number of $J/\ddot{I}ˆ$ events collected with the BESIII detector in 2009 and 2012 is performed using inclusive decays of the $J/\ddot{I}ˆ$ . The number of $J/\ddot{I}ˆ$ events tak…

Search for C-parity violation in $J/\ddot{I}ˆ\to {\hat{I}}^3{\hat{I}}^3$ and ${\hat{I}}^3\ddot{I}•$

BESIII Collaboration, M. Ablikim, M. N. Achasov +391

Using $1.06\times 10^8$ $\ddot{I}ˆ(3686)$ events recorded in $e^{+}{e}^{-}$ collisions at $\sqrt{s}=$ 3.686 GeV with the BESIII at the BEPCII collider, we present searches for C-parity viola…

Determination of CKM matrix element and axial vector form factors from weak decays of quantum-entangled strange baryons

BESIII Collaboration, M. Ablikim, M. N. Achasov +697

The electromagnetic structure of the nucleon can be determined from the scattering of electrons off a nucleon target. However, to study its axial structure, neutrino beams are requ…

Observation of $\hat{I}{\cdot }_c\to \ddot{I}‰\ddot{I}‰$ in $J/\ddot{I}ˆ\to {\hat{I}}^3\ddot{I}‰\ddot{I}‰$

M. Ablikim, M. N. Achasov, S. Ahmed +451

Using a sample of $(1310.6\pm 7.0)\times 10^6$ $J/\ddot{I}ˆ$ events recorded with the BESIII detector at the symmetric electron positron collider BEPCII, we report the observation of the de…

Search for the leptonic decays $D^{\ast +}\to e^{+}\hat{I}{½}_e$ and $D^{\ast +}\to \hat{I}{¼}^{+}\hat{I}{½}_{\hat{I}}¼$

BESIII Collaboration, M. Ablikim, M. N. Achasov +572

We present the first search for the leptonic decays $D^{\ast +}\to e^{+}\hat{I}{½}_e$ and $D^{\ast +}\to \hat{I}{¼}^{+}\hat{I}{½}_{\hat{I}}¼$ by analyzing a data sample of electron-positron collisions recorded with the BESII…

Search for baryon and lepton number violating decays $D^{+}\to \bar{\hat{I}}›(\bar{\hat{I}}{\pounds }^0)e^{+}$ and $D^{+}\to \hat{I}›(\hat{I}{\pounds }^0)e^{+}$

BESIII Collaboration, M. Ablikim, M. N. Achasov +480

Using a 2.93 fb${}^{-1}$ data sample of electron-positron collisions taken with the BESIII detector at a center-of-mass energy of 3.773 GeV, which corresponds to $(8296\pm31\pm64)\ti…

Precision Measurement of the Decay $\hat{I}{\pounds }^{+}\to p{\hat{I}}^3$ in the Process $J/\ddot{I}ˆ\to \hat{I}{\pounds }^{+}\bar{\hat{I}}{\pounds }^{-}$

BESIII Collaboration, M. Ablikim, M. N. Achasov +593

Using $(10087\pm 44)\times 10^6$ $J/\ddot{I}ˆ$ events collected with the BESIII detector, the radiative hyperon decay $\hat{I}\pounds \to p{\hat{I}}^3$ is studied at an electron-positron collider exp…

Partial wave analysis of $J/\ddot{I}ˆ\to {\hat{I}}^3\hat{I}\cdot \hat{I}\cdot$

M. Ablikim, M. N. Achasov, O. Albayrak +358

Based on a sample of $2.25\times 10^8$ $J/\ddot{I}ˆ$ events collected with the BESIII detector at BEPCII, a full partial wave analysis on $J/\ddot{I}ˆ\to {\hat{I}}^3\hat{I}\cdot \hat{I}\cdot$ was performed using the relativ…

Evidence for the Direct Two-Photon Transition from $\ddot{I}ˆ(3686)$ to $J/\ddot{I}ˆ$

BESIII Collaboration, M. Ablikim, M. N. Achasov +354

The two-photon transition $\ddot{I}ˆ(3686)\to {\hat{I}}^3{\hat{I}}^{3}J/\ddot{I}ˆ$ is studied in a sample of 106 million $\ddot{I}ˆ(3686)$ decays collected by the BESIII detector. The branching fraction is measured to be $…

The p_T Spectrum in Heavy-Flavour Hadroproduction

M. Cacciari, M. Greco, P. Nason

We consider the transverse-momentum distribution of heavy flavours in hadronic collisions. We present a formalism in which large transverse-momentum logarithms are resummed at the…

Measurement of the branching fraction and decay asymmetry of $\hat{I}›\to n{\hat{I}}^3$

BESIII Collaboration, M. Ablikim, M. N. Achasov +565

The radiative hyperon decay $\hat{I}›\to n{\hat{I}}^3$ is studied using $(10087\pm 44)\times 10^6$ $J/\ddot{I}ˆ$ events collected with the BESIII detector operating at BEPCII. The absolute branching frac…

Observation of $a_0(1710{)}^{+}\to K_S^0{K}^{+}$ in study of the $D_s^{+}\to K_S^0{K}^{+}\ddot{I}{€}^0$ decay

BESIII Collaboration, M. Ablikim, M. N. Achasov +551

Using $e^{+}{e}^{-}$ annihilation data corresponding to an integrated luminosity of 6.32 fb${}^{-1}$ collected at center-of-mass energies between 4.178 GeV and 4.226 GeV with the BESIII de…

Measurement of the Energy-Dependent Electromagnetic Form Factors of a Charmed Baryon

BESIII Collaboration, M. Ablikim, M. N. Achasov +609

We study the process $e^{+}{e}^{-}\to \hat{I}{›}_c^{+}\bar{\hat{I}}{›}_c^{-}$ at twelve center-of-mass energies from $4.6119$ to $4.9509\mathrm{GeV}$ using data samples collected by the BESIII detec…

Measurement of the center-of-mass energies at BESIII via the di-muon process

M. Ablikim, M. N. Achasov, X. C. Ai +407

From 2011 to 2014, the BESIII experiment collected about 5 fb${}^{-1}$ data at center-of-mass energies around 4 GeV for the studies of the charmonium-like and higher excited charmoni…

Measurement of the Born cross section for $e^{+}{e}^{-}\to p{K}^{-}{K}^{-}\bar{\hat{I}}{ž}^{+}$ at $\sqrt{s}=$ 3.5-4.9 GeV

BESIII Collaboration, M. Ablikim, M. N. Achasov +695

Using $e^{+}{e}^{-}$ collision data corresponding to a total integrated luminosity of 20 ${\mathrm{fb}}^{-1}$ collected with the BESIII detector at the BEPCII collider, we present a measurem…

Observation of the electromagnetic radiative decays of the \boldmath{$\hat{I}›(1520)$} and \boldmath{$\hat{I}›(1670)$} to \boldmath{${\hat{I}}^3\hat{I}{\pounds }^0$}

BESIII Collaboration, M. Ablikim, M. N. Achasov +689

Using $(10087\pm 44)\times 10^6$ $J/\ddot{I}ˆ$ events collected with the BESIII detector, we report the first observation of the electromagnetic radiative decays of the $\hat{I}›(1520)$ and $Λ(…

Measurement of the absolute branching fraction of the singly Cabibbo suppressed decay $\hat{I}{›}_c^{+}\to p\hat{I}{\cdot }^{\prime }$

BESIII Collaboration, M. Ablikim, M. N. Achasov +569

The singly Cabibbo suppressed decay $\hat{I}{›}_c^{+}\to p\hat{I}{\cdot }^{\prime }$ is measured using 4.5 ${\mathrm{fb}}^{-1}$ of $e^{+}{e}^{-}$ collision data collected at center-of-mass energies between 4.…

Cross section measurements of the $e^{+}{e}^{-}\to D^{\ast +}{D}^{\ast -}$ and $e^{+}{e}^{-}\to D^{\ast +}{D}^{-}$ processes at center-of-mass energies from 4.085 to 4.600 GeV

BESIII Collaboration, M. Ablikim, M. N. Achasov +549

The Born cross sections of the $e^{+}{e}^{-}\to D^{\ast +}{D}^{\ast -}$ and $e^{+}{e}^{-}\to D^{\ast +}{D}^{-}$ processes are measured using $e^{+}{e}^{-}$ collision data collected with the BESIII experiment at cen…

Study of $\hat{I}{›}_c^{+}\to \hat{I}›\hat{I}{¼}^{+}\hat{I}{½}_{\hat{I}}¼$ and Test of Lepton Flavor Universality with $\hat{I}{›}_c^{+}\to \hat{I}›{\ell }^{+}\hat{I}{½}_{\ell }$ Decays

BESIII Collaboration, M. Ablikim, M. N. Achasov +614

The measurement of the Cabibbo-favored semileptonic decay $\hat{I}{›}_c^{+}\to \hat{I}›\hat{I}{¼}^{+}\hat{I}{½}_{\hat{I}}¼$ is reported using $4.5{\mathrm{fb}}^{-1}$ of $e^{+}{e}^{-}$ annihilation data collected at center…

Measurement of Born Cross Sections and Effective Form Factors of $e^{+}{e}^{-}\to \hat{I}{\text{c◯}}^{-}\bar{\hat{I}}{\text{c◯}}^{+}$ from$\sqrt{s}$ = 3.7 to 4.7 GeV

BESIII Collaboration, M. Ablikim, M. N. Achasov +635

Using $e^{+}{e}^{-}$ collision data corresponding to an integrated luminosity of 22.7 fb${}^{-1}$, collected at center-of-mass energies between 3.7 and 4.7 GeV with the BESIII detector at…

Observation of the decay $\ddot{I}ˆ(3686)\to \hat{I}{\pounds }^0\bar{\hat{I}}{\pounds }^0\ddot{I}‰$

BESIII Collaboration, M. Ablikim, M. N. Achasov +689

Using a dataset of $(27.12\pm 0.14)\times 10^8$ $\ddot{I}ˆ(3686)$ events collected by the BESIII detector operating at the BEPCII collider, we report the first observation of the decay…

Measurement of the CKM angle ${\hat{I}}^3$ in $B^{\pm }\to D(\to K_{\mathrm{S}}^0{h}^{\prime +}{h}^{\prime -})h^{\pm }$ decays with a novel approach

The BESIII, LHCb Collaborations, : +1903

A measurement of the CKM angle ${\hat{I}}^3$ and related strong-phase parameters is performed using a novel, model-independent approach in ${B^{\pm}\rightarrow D(\rightarrow K^{0}_{\rm S} h…

Observation of $\hat{I}{\cdot }_c\to p\bar{p}\hat{I}\cdot$ via $\ddot{I}ˆ(3686)\to {\hat{I}}^{3}p\bar{p}\hat{I}\cdot$

BESIII Collaboration, M. Ablikim, M. N. Achasov +766

The study reports the first observation of the decay η_c → p p̄ η using a large ψ(3686) data set collected with the BESIII detector, and determines its branching fraction while acc…

Search for the radiative decays $D^{+}\to {\hat{I}}^3\ddot{I}{}^{+}$ and $D^{+}\to {\hat{I}}^3{K}^{\ast +}$

BESIII Collaboration, M. Ablikim, M. N. Achasov +652

We search for the radiative decays $D^{+}\to {\hat{I}}^3\ddot{I}{}^{+}$ and $D^{+}\to {\hat{I}}^3{K}^{\ast +}$ using 20.3~fb${}^{-1}$ of $e^{+}{e}^{-}$ annihilation data collected at the center-of-mass energy $\sqrt{s}=3…

The CGEM-IT readout chain

A. Amoroso, R. Baldini Ferroli, I. Balossino +44

An innovative Cylindrical Gas Electron Multiplier (CGEM) detector is under construction for the upgrade of the inner tracker of the BESIII experiment. A novel system has been worke…

Experimental study of psi' decays to K+K- pi^0 and K+K- eta

M. Ablikim, M. N. Achasov, D. J. Ambrose +353

Using $(106\pm 4)\times 10^6$ $\psip$ events accumulated with the BESIII detector at the BEPCII $e^{+}{e}^{-}$ collider, we present measurements of the branching fractions for psi' decays…

Study of the decays $D^{+}\to \hat{I}{\cdot }^{(\prime )}{e}^{+}\hat{I}{½}_e$

M. Ablikim, M. N. Achasov, S. Ahmed +442

The charm semileptonic decays $D^{+}\to \hat{I}\cdot e^{+}\hat{I}{½}_e$ and $D^{+}\to \hat{I}{\cdot }^{\prime }{e}^{+}\hat{I}{½}_e$ are studied with a sample of $e^{+}{e}^{-}$ collision data corresponding to an integrated luminosity of 2.93 fb…

Study of $\ddot{I}•\to K\bar{K}$ in the amplitude analysis of $D^{+}\to K_S^0{K}_L^0\ddot{I}{€}^{+}$

BESIII Collaboration, M. Ablikim, M. N. Achasov +772

We present the first amplitude analysis and branching fraction measurement of $D^{+}\to K_S^0{K}_L^0\ddot{I}{€}^{+}$ decay. The analysis uses a dataset corresponding to an in…

Measurements of Normalized Differential Cross Sections of Inclusive $\hat{I}\cdot$ Production in $e^{+}{e}^{-}$ Annihilation at Energy from 2.0000 to 3.6710 GeV

BESIII Collaboration, M. Ablikim, M. N. Achasov +650

Using data samples collected with the BESIII detector operating at the BEPCII storage ring, the cross section of the inclusive process $e^{+}{e}^{-}\to \hat{I}\cdot +X$, normalized by the tot…

Observation of the decay $\ddot{I}{‡}_{cJ}\to \hat{I}{\text{c◯}}^{-}\bar{\hat{I}}{\text{c◯}}^{+}$

BESIII Collaboration, M. Ablikim, M. N. Achasov +595

Using an $e^{+}{e}^{-}$ collision data sample of $(27.08\pm 0.14)\times 10^8$ $\ddot{I}ˆ(3686)$ events collected by the BESIII detector, we report the first observation of $χ_{cJ} \to Ω^-…

Search for invisible decays of the $\hat{I}›$ baryon

BESIII Collaboration, M. Ablikim, M. N. Achasov +498

A search for invisible decays of the $\hat{I}›$ baryon is carried out in the process $J/\ddot{I}ˆ\to \hat{I}›\bar{\hat{I}}›$ based on $(1.0087\pm 0.0044)\times 10^{10}$ $J/\ddot{I}ˆ$ events collected with the BESIII d…

Measurement of proton electromagnetic form factors in $e^{+}{e}^{-}\to p\bar{p}$ in the energy region 2.00-3.08 GeV

M. Ablikim, M. N. Achasov, P. Adlarson +473

The process of $e^{+}{e}^{-}\to p\bar{p}$ is studied at 22 center-of-mass energy points ($\sqrt{s}$) from 2.00 to 3.08 GeV, exploiting 688.5~pb${}^{-1}$ of data collected with the…

Two-photon widths of the $\ddot{I}{‡}_{c0,2}$ states and helicity analysis for $χ_{c2}\arγγ$}

BESIII Collaboration, M. Ablikim, M. N. Achasov +354

Based on a data sample of 106 M $\ddot{I}{ˆ}^{\prime }$ events collected with the BESIII detector, the decays $ψ^{\prime}\arγχ_{c0, 2}$,$χ_{c0, 2}\arγγ$ are studied to determine the tw…

Amplitude Analysis of the Isospin-Violating Decay $J/\ddot{I}ˆ\to {\hat{I}}^3\hat{I}\cdot \ddot{I}{€}^0$

BESIII Collaboration, M. Ablikim, M. N. Achasov +759

Using $(10087\pm 44)\times 10^6$ $J/\ddot{I}ˆ$ events collected with the BESIII detector, we perform the first amplitude analysis of the process $J/\ddot{I}ˆ\to {\hat{I}}^3\hat{I}\cdot \ddot{I}{€}^0$. The decay is domina…

Evidence for $e^{+}{e}^{-}\to {\hat{I}}^3\ddot{I}{‡}_{c1,2}$ at center-of-mass energies from 4.009 to 4.360 GeV

BESIII Collaboration, M. Ablikim, M. N. Achasov +405

Using data samples collected at center-of-mass energies of $\sqrt{s}$ = 4.009, 4.230, 4.260, and 4.360 GeV with the BESIII detector operating at the BEPCII collider, we perform a s…

Precision Measurements of $\mathcal{B}[\ddot{I}ˆ(3686)\to \ddot{I}{€}^{+}\ddot{I}{€}^{-}J/\ddot{I}ˆ]$ and $\mathcal{B}[J/\ddot{I}ˆ\to l^{+}{l}^{-}]$

BESIII Collaboration, M. Ablikim, M. N. Achasov +356

Based on $(106.41\pm 0.86)\times 10^6$ $\ddot{I}ˆ(3686)$ events collected with the BESIII detector at the BEPCII collider, the branching fractions of $\ddot{I}ˆ(3686)\to \ddot{I}{€}^{+}\ddot{I}{€}^{-}J/\ddot{I}ˆ$, $J/Ï…

Test beam results of a Cylindrical GEM detector for the BESIII experiment

G. Mezzadri, M. Alexeev, A. Amoroso +50

Gas detector are very light instrument used in high energy physics to measure the particle properties: position and momentum. Through high electric field is possible to use the Gas…

Study of $\hat{I}\cdot (1475)$ and $X(1835)$ in radiative $J/\ddot{I}ˆ$ decays to ${\hat{I}}^3\ddot{I}•$

BESIII Collaboration, M. Ablikim, M. N. Achasov +428

The decay $J/\ddot{I}ˆ\to {\hat{I}}^3{\hat{I}}^3\ddot{I}•$ is studied using a sample of $1.31\times 10^9$ $J/\ddot{I}ˆ$ events collected with the BESIII detector. Two structures around 1475 MeV/c${}^2$ and 1835…

Observation of $e^{+}{e}^{-}\to D_s^{+}\overline{D}{}^{(\ast )0}{K}^{-}$ and study of the $P$-wave $D_s$ mesons

BESIII Collaboration, M. Ablikim, M. N. Achasov +453

Studies of $e^{+}{e}^{-}\to D_s^{+}\overline{D}{}^{(\ast )0}{K}^{-}$ and the $P$-wave charmed-strange mesons are performed based on an $e^{+}{e}^{-}$ collision data sample corresponding to an integrat…

Study of $\hat{I}\cdot \to \ddot{I}{€}^{+}\ddot{I}{€}^{-}{l}^{+}{l}^{-}$

BESIII Collaboration, M. Ablikim, M. N. Achasov +639

Using a sample of $(10087\pm 44)\times 10^6$ $J/\ddot{I}ˆ$ events accumulated with the BESIII detector, we analyze the decays $\hat{I}\cdot \to \ddot{I}{€}^{+}\ddot{I}{€}^{-}{l}^{+}{l}^{-}$ ($l=e$ or $\hat{I}¼$) via the process…

First observation of the isospin violating decay $J/\ddot{I}ˆ\to \hat{I}›\bar{\hat{I}}{\pounds }^0+c.c.$

M. Ablikim, M. N. Achasov, D. J. Ambrose +353

Using a sample of $(225.2\pm 2.8)\times 10^6$ $J/\ddot{I}ˆ$ events collected with the BESIII detector, we present results of a study of $J/\ddot{I}ˆ\to {\hat{I}}^3\hat{I}›\bar{\hat{I}}›$ and report the first o…

Observation of $\ddot{I}ˆ(3686)\to \hat{I}{\cdot }^{\prime }{e}^{+}{e}^{-}$

M. Ablikim, M. N. Achasov, S. Ahmed +454

Using a data sample of $448.1\times 10^6$ $\ddot{I}ˆ(3686)$ events collected with the BESIII detector at the BEPCII collider, we report the first observation of the electromagnetic Dalit…

Measurements of absolute branching fractions for $D$ mesons decays into two pseudoscalar mesons

M. Ablikim, M. N. Achasov, S. Ahmed +431

Using a data sample of $e^{+}{e}^{-}$ collision data with an integrated luminosity of 2.93 fb${}^{-1}$ taken at the center-of-mass energy $\sqrt{s}=3.773$~GeV with the BESIII detector oper…

Search for lepton number violating decays of $D_s^{+}\to h^{-}{h}^0{e}^{+}{e}^{+}$

BESIII Collaboration, M. Ablikim, M. N. Achasov +655

Based on 7.33 fb${}^{-1}$ of $e^{+}{e}^{-}$ collision data collected by the BESIII detector operating at the BEPCII collider at center-of-mass energies from 4.128 to 4.226 GeV, a search fo…

Innovative design and construction technique for the Cylindrical GEM detector for the BESIII experiment

A. Amoroso, M. Alexeev, R. Baldini Ferroli +49

Gas detector are very light instrument used in high energy physics to measure the particle properties: position and momentum. Through high electric field is possible to use the Gas…

Observation of $e^{+}{e}^{-}\to \ddot{I}{€}^{+}\ddot{I}{€}^{-}\ddot{I}ˆ(3770)$ and $D_1(2420{)}^0{\bar{D}}^0+c.c.$

BESIII Collaboration, M. Ablikim, M. N. Achasov +475

Several intermediate states of the reaction channels $e^{+}{e}^{-}\to \ddot{I}{€}^{+}\ddot{I}{€}^{-}{D}^0{\bar{D}}^0$ and $e^{+}{e}^{-}\to \ddot{I}{€}^{+}\ddot{I}{€}^{-}{D}^{+}{D}^{-}$ are studied usin…

Role of the singular factors in the standard fits for initial parton densities

B. I. Ermolaev, M. Greco, S. I. Troyan

Total resummation of double- and single- logarithms of x contributing to the spin-dependent structure function g_1 ensures its steep rise at small $x$. In the asymptotic limit x ->…

Search for a scalar partner of the $X(3872)$ via $\ddot{I}ˆ(3770)$ decays into ${\hat{I}}^3\hat{I}\cdot \hat{I}{\cdot }^{\prime }$ and ${\hat{I}}^3\ddot{I}{€}^{+}\ddot{I}{€}^{-}J/\ddot{I}ˆ$

BESIII Collaboration, M. Ablikim, M. N. Achasov +609

Using a data sample corresponding to an integrated luminosity of 2.93 fb${}^{-1}$ collected at a center-of-mass energy of 3.773~GeV with the BESIII detector at the BEPCII collider, w…

Improved measurement of the branching fraction of $h_c\to {\hat{I}}^3\hat{I}{\cdot }^{\prime }/\hat{I}\cdot$ and search for $h_c\to {\hat{I}}^3\ddot{I}{€}^0$