C. Leng

Measurement of branching fractions for $I ¨ (3686) \to I^^{3} I^\cdot^{'}, I^^{3} I^\cdot$ and $I^^{3} I ¨ ^{0}$

M. Ablikim, M. N. Achasov, X. C. Ai +420

Using a data sample of $448 \times 1 0^{6}$ $I ¨ (3686)$ events collected with the BESIII detector operating at the BEPCII storage ring, the decays $I ¨ (3686) \to I^^{3} I^\cdot$ and $Ï(368…

Measurements of the absolute branching fractions and $C P$ asymmetries for $D^{+} \to K_{S, L}^{0} K^{+} (I ¨ ^{0})$

M. Ablikim, M. N. Achasov, S. Ahmed +427

Using $e^{+} e^{-}$ collision data corresponding to an integrated luminosity of 2.93 fb $^{- 1}$ taken at a center-of-mass energy of 3.773 GeV with the BESIII detector, we determine the a…

Observation of $e^{+} e^{-} \to K K ˉ J / I ¨ $ at center-of-mass energies from 4.189 to 4.600 GeV

BESIII Collaboration, M. Ablikim, M. N. Achasov +442

We investigate the process $e^{+} e^{-} \to K K ˉ J / I ¨ $ at center-of-mass energies from 4.189 to 4.600 GeV using 4.7 fb $^{- 1}$ of data collected by the BESIII detector at…

Study of $I ¨ $ decays to the $I^^{-} I^ˉ ^{+}$ and $I^£ (1385)^{\mp} I^ˉ £ (1385)^{\pm}$ final states

BESIII Collaboration, M. Ablikim, M. N. Achasov +407

We study the decays of the charmonium resonances $J / I ¨ $ and $I ¨ (3686)$ to the final states $I^^{-} I^ˉ ^{+}$ , $I^£ (1385)^{\mp} I^ˉ £ (1385)^{\pm}$ based on a single baryon tag metho…

Observation of the Semileptonic Decay $D^{0} \to a_{0} (980)^{-} e^{+} I^½_{e}$ and Evidence for $D^{+} \to a_{0} (980)^{0} e^{+} I^½_{e}$

BESIII Collaboration, M. Ablikim, M. N. Achasov +434

Using an $e^{+} e^{-}$ collision data sample of 2.93 fb $^{- 1}$ collected at a center-of-mass energy of 3.773 GeV by the BESIII detector at BEPCII, we report the observation of $D^0 \to…

Observation of the isospin-violating decay $J / I ¨ \to I ¨ I ¨ ^{0} f_{0} (980)$

BESIII Collaboration, M. Ablikim, M. N. Achasov +410

Using a sample of 1.31 billion $J / I ¨ $ events collected with the BESIII detector at the BEPCII collider, the decays $J / I ¨ \to I ¨ I ¨ ^{+} I ¨ ^{-} I ¨ ^{0}$ and $J / I ¨ \to I ¨ I ¨ ^{0} I ¨ ^{0} I ¨ ^{0}$ …

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

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

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

Study of decay dynamics and $C P$ asymmetry in $D^{+} \to K_{L}^{0} e^{+} I^½_{e}$ decay

BESIII Collaboration, M. Ablikim, M. N. Achasov +400

Using 2.92~fb $^{- 1}$ of electron-positron annihilation data collected at $s = 3.773$ ~GeV with the BESIII detector, we obtain the first measurements of the absolute branching…

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

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

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

Luminosity measurements for the R scan experiment at BESIII

M. Ablikim, M. N. Achasov, S. Ahmed +423

By analyzing the large-angle Bhabha scattering events $e^{+} e^{-}$ $\to$ ( $I^^{3}$ ) $e^{+} e^{-}$ and diphoton events $e^{+} e^{-}$ $\to$ $I^^{3} I^^{3}$ for the data sets collected at center-of-m…

Observation of $I ¨ (3686) \to e^{+} e^{-} I ¨ _{c J}$ and $I ¨ _{c J} \to e^{+} e^{-} J / I ¨ $

M. Ablikim, M. N. Achasov, X. C. Ai +420

Using $4.479 \times 1 0^{8}$ $I ¨ (3686)$ events collected with the BESIII detector, we search for the decays $I ¨ (3686) \to e^{+} e^{-} I ¨ _{c 0, 1, 2}$ and $Ï_{c0,1,2} \rightarrow…

Measurement of the absolute branching fraction of the inclusive semileptonic $I^_{c}^{+}$ decay

BESIII Collaboration, M. Ablikim, M. N. Achasov +435

Using a data sample corresponding to an integrated luminosity of 567 pb $^{- 1}$ collected at a center-of-mass energy of $s = 4.6$ GeV with the BESIII detector, we measure the a…

physics.ins-det2018

A Cylindrical GEM Inner Tracker for the BESIII experiment at IHEP

R. Farinelli, M. Alexeev, A. Amoroso +43

The Beijing Electron Spectrometer III (BESIII) is a multipurpose detector that collects data provided by the collision in the Beijing Electron Positron Collider II (BEPCII), hosted…

Measurement of the $D_{s}^{+} \to ℓ^{+} I^½_{ℓ}$ branching fractions and the decay constant $f_{D_{s}^{+}}$

M. Ablikim, M. N. Achasov, X. C. Ai +412

Using 482~pb $^{- 1}$ of $e^{+} e^{-}$ collision data collected at a center-of-mass energy of $s = 4.009$ GeV with the BESIII detector, we measure the branching fractions of the de…

Search for the rare decay $D^{+} \to D^{0} e^{+} I^½_{e}$

BESIII collaboration, M. Ablikim, M. N. Achasov +429

We search for the rare decay $D^{+} \to D^{0} e^{+} I^½_{e}$ , using a data set with an integrated luminosity of 2.93 $f b^{- 1}$ collected at $s = 3.773$ GeV with the BESIII detector…

Measurement of the absolute branching fraction of $D_{s 0}^{*\pm} (2317) \to I ¨ ^{0} D_{s}^{\pm}$

M. Ablikim, M. N. Achasov, S. Ahmed +427

The process $e^{+} e^{-} \to D_{s}^{*+} D_{s 0}^{*-} (2317) + c . c .$ is observed for the first time with the data sample of 567~pb $^{- 1}$ collected with the BESIII detector operating at the…

Study of Dynamics of $D^{0} \to K^{-} e^{+} I^½_{e}$ and $D^{0} \to I ¨ ^{-} e^{+} I^½_{e}$ Decays

BESIII Collaboration, M. Ablikim, M. N. Achasov +400

In an analysis of a 2.92~fb $^{- 1}$ data sample taken at 3.773~GeV with the BESIII detector operated at the BEPCII collider, we measure the absolute decay branching fractions to be…

Measurement of Singly Cabibbo-Suppressed Decays $D^{0} \to I ¨ ^{0} I ¨ ^{0} I ¨ ^{0}$ , $I ¨ ^{0} I ¨ ^{0} I^\cdot$ , $I ¨ ^{0} I^\cdot I^\cdot$ and $I^\cdot I^\cdot I^\cdot$

BESIII Collaboration, M. Ablikim, M. N. Achasov +431

Using a data sample of $e^{+} e^{-}$ collision data corresponding to an integrated luminosity of 2.93 $f b^{- 1}$ collected with the BESIII detector at a center-of-mass energy of $\sqrt{s…

Measurement of the matrix elements for the decays $I^\cdot^{'} \to I^\cdot I ¨ ^{+} I ¨ ^{-}$ and $I^\cdot^{'} \to I^\cdot I ¨ ^{0} I ¨ ^{0}$

M. Ablikim, M. N. Achasov, S. Ahmed +436

Based on a sample of $1.31 \times 1 0^{9}$ $J / I ¨ $ events collected with the BESIII detector, the matrix elements for the decays $I^\cdot^{'} \to I^\cdot I ¨ ^{+} I ¨ ^{-}$ and $Î·^{\prime}\toÎ·Ï^{0…

Observation of an anomalous line shape of the $I^\cdot^{'} I ¨ ^{+} I ¨ ^{-}$ mass spectrum near the $p p ˉ$ mass threshold in $J / I ¨ \to I^^{3} I^\cdot^{'} I ¨ ^{+} I ¨ ^{-}$

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

Using $1.09 \times 1 0^{9}$ $J / I ¨ $ events collected by the BESIII experiment in 2012, we study the $J / I ¨ \to I^^{3} I^\cdot^{'} I ¨ ^{+} I ¨ ^{-}$ process and observe a significant abrupt…

Observation of the helicity-selection-rule suppressed decay of the $I ¨ _{c 2}$ charmonium state

BESIII Collaboration, M. Ablikim, M. N. Achasov +424

The decays of $I ¨ _{c 2} \to K^{+} K^{-} I ¨ ^{0}$ , $K_{S} K^{\pm} I ¨ ^{\mp}$ and $I ¨ ^{+} I ¨ ^{-} I ¨ ^{0}$ are studied with the $I ¨ (3686)$ data samples collected with the Beijing Spectrometer (…

hep-ph2018

A model to explain angular distributions of $J / I ¨ $ and $I ¨ (2 S)$ decays into $I^ I^$ and $I^£^{0} I^£^{0}$

M. Alekseev, A. Amoroso, R. Baldini Ferroli +28

BESIII data show a particular angular distribution for the decay of the $J / I ¨ $ and $I ¨ (2 S)$ mesons into the hyperons $I^ I^$ and $I^£^{0} I^£^{0}$ . More in details the an…

Study of $I ¨ _{c J}$ decaying into $I ¨ $ $K^{*} (892)$ $K ˉ$

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

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

physics.ins-det2019

Triple GEM performance in magnetic field

M. Alexeev, A. Amoroso, S. Bagnasco +65

Performance of triple GEM prototypes in strong magnetic field has been evaluated bymeans of a muon beam at the H4 line of the SPS test area at CERN. Data have been reconstructedand…

hep-ex2019

Measurement of $e^{+} e^{-} \to I ¨ ^{+} I ¨ ^{-} I ¨ (3686)$ from 4.008 to 4.600 $\sim$ GeV and observation of a charged structure in the $I ¨ ^{\pm} I ¨ (3686)$ mass spectrum

M. Ablikim, M. N. Achasov, S. Ahmed +424

We study the process $e^{+} e^{-} \to I ¨ ^{+} I ¨ ^{-} I ¨ (3686)$ using 5.1 $f b^{- 1}$ of data collected at 16 center-of-mass energy ( $s$ ) points from 4.008 to 4.600 $\sim$ Ge…

Amplitude analysis of the $K_{S} K_{S}$ system produced in radiative $J / I ¨ $ decays

BESIII Collaboration, M. Ablikim, M. N. Achasov +444

An amplitude analysis of the $K_{S} K_{S}$ system produced in radiative $J / I ¨ $ decays is performed using the $(1310.6 \pm 7.0) \times 1 0^{6}$ $J / I ¨ $ decays collected by the BESIII detec…

Search for the weak decay $I^\cdot^{'} \to K^{\pm} I ¨ ^{\mp}$ and precise measurement of the branching fraction $B (J / I ¨ \to I ¨ I^\cdot^{'})$

BESIII Collaboration, M. Ablikim, M. N. Achasov +414

We present the first search for the rare decay of $I^\cdot^{'}$ into $K^{\pm} I ¨ ^{\mp}$ in $J / I ¨ \to I ¨ I^\cdot^{'}$ , using a sample of $1.3 \times 1 0^{9}$ $J / I ¨ $ events collected with the…

Measurements of Absolute Branching Fractions for $I^_{c}^{+} \to I^^{0} K^{+}$ and $I^ (1530)^{0} K^{+}$

BESIII Collaboration, M. Ablikim, M. N. Achasov +435

We report the first measurements of absolute branching fractions for the $W$ -exchange-only processes $I^_{c}^{+} \to I^^{0} K^{+}$ and $I^_{c}^{+} \to I^ (1530)^{0} K^{+}$ with the double-tag technique,…

Observation of $I ¨ _{c 2} \to I^\cdot^{'} I^\cdot^{'}$ and $I ¨ _{c 0, 2} \to I^\cdot I^\cdot^{'}$

BESIII Collaboration, M. Ablikim, M. N. Achasov +443

Using a sample of $447.9 \times 1 0^{6}$ $I ¨ (3686)$ events collected with the BESIII detector in 2009 and 2012, we study the decays $I ¨ _{c 0, 2} \to$ $I^\cdot^{'} I^\cdot^{'}$ and $I^\cdot I^\cdot^{'}$ . The decays $Ï_…

Measurement of higher-order multipole amplitudes in $I ¨ (3686) \to I^^{3} I ¨ _{c 1, 2}$ with $I ¨ _{c 1, 2} \to I^^{3} J / I ¨ $ and search for the transition $I^\cdot_{c} (2 S) \to I^^{3} J / I ¨ $

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

Using 106~million $I ¨ (3686)$ events collected with the BESIII detector, we measure multipole amplitudes for the decay $I ¨ (3686) \to I^^{3} I ¨ _{c 1, 2} \to I^^{3} I^^{3} J / I ¨ $ beyond the dominan…

Measurement of $B (I ¨ (3770) \to I^^{3} I ¨ _{c 1})$ and search for $I ¨ (3770) \to I^^{3} I ¨ _{c 2}$

BESIII Collaboration, M. Ablikim, M. N. Achasov +411

We report a measurement of the branching fraction of $I ¨ (3770) \to I^^{3} I ¨ _{c 1}$ and search for the transition $I ¨ (3770) \to I^^{3} I ¨ _{c 2}$ based on 2.92~fb $^{- 1}$ of $e^{+} e^{-}$ data a…

Search for $Z_{c} (3900)^{\pm} \to I ¨ I ¨ ^{\pm}$

BESIII Collaboration, M. Ablikim, M. N. Achasov +414

The decay $Z_{c} (3900)^{\pm} \to I ¨ I ¨ ^{\pm}$ is searched for using data samples collected with the BESIII detector operating at the BEPCII storage ring at center-of-mass energies $\sqrt{s}…

Observation of $e^{+} e^{-} \to I^\cdot Y (2175)$ 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 $e^{+} e^{-} \to I^\cdot Y (2175)$ at center-of-mass energies between 3.7 and 4.6 $\sim$ GeV with a statistical significance larger than $10 I ¨ $ us…

Measurement of the $e^{+} e^{-} \to I ¨ ^{+} I ¨ ^{-}$ Cross Section between 600 and 900 MeV Using Initial State Radiation

M. Ablikim, M. N. Achasov, X. C. Ai +398

We extract the $e^{+} e^{-} \to I ¨ ^{+} I ¨ ^{-}$ cross section in the energy range between 600 and 900 MeV, exploiting the method of initial state radiation. A data set with an integrat…

Search for $I ¨ (3686) \to I^^{3} I^\cdot_{c} (I^\cdot (1405)) \to I^^{3} I ¨ ^{+} I ¨ ^{-} I ¨ ^{0}$

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

Using a sample of $448.1 \times 1 0^{6}$ $I ¨ (3686)$ events collected with the BESIII detector, a search for the isospin violating decay $I^\cdot_{c} \to I ¨ ^{+} I ¨ ^{-} I ¨ ^{0}$ via $Ï(3686)\toÎ…

Evidence for the singly-Cabibbo-suppressed decay $I^_{c}^{+} \to p I^\cdot$ and search for $I^_{c}^{+} \to p I ¨ ^{0}$

BESIII Collaboration, M. Ablikim, M. N. Achasov +421

We study the singly-Cabibbo-suppressed decays $I^_{c}^{+} \to p I^\cdot$ and $I^_{c}^{+} \to p I ¨ ^{0}$ using $I^_{c}^{+} I^_{c}^{+}$ pairs produced by $e^{+} e^{-}$ collisions at a center-of-mass e…

Measurement of the integrated luminosity and the center-of-mass energy of the data taken by BESIII at $s = 2.125$ 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…

Measurements of absolute hadronic branching fractions of $I^_{c}^{+}$ baryon

BESIII Collaboration, M. Ablikim, M. N. Achasov +409

Using $567 pb^{- 1}$ of $e^{+} e^{-}$ collisions recorded at $s = 4.599 GeV$ with the BESIII detector, we report first measurements of absolute hadronic branching fractions…

Measurement of Singly Cabibbo Suppressed Decays $I^_{c}^{+} \to p I ¨ ^{+} I ¨ ^{-}$ and $I^_{c}^{+} \to p K^{+} K^{-}$

BESIII collaboration, M. Ablikim, M. N. Achasov +432

Using 567 $p b^{- 1}$ of data collected with the BESIII detector at a center-of-mass energy of $s =$ 4.599 $G e V$ , near the $I^_{c}^{+} I^_{c}^{-}$ threshold, we study the singly…

Determination of the number of $J / I ¨ $ events with inclusive $J / I ¨ $ decays

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

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

Amplitude analysis of $D^{0} \to K^{-} I ¨ ^{+} I ¨ ^{+} I ¨ ^{-}$

M. Ablikim, M. N. Achasov, X. C. Ai +420

We present an amplitude analysis of the decay $D^{0} \to K^{-} I ¨ ^{+} I ¨ ^{+} I ¨ ^{-}$ based on a data sample of 2.93 ${\mbox{\,fb}^{-1}}$ acquired by the BESIII detector at…

Precision Study of $I^\cdot^{'} \to I^^{3} I ¨ ^{+} I ¨ ^{-}$ Decay Dynamics

BESIII Collaboration, M. Ablikim, M. N. Achasov +431

Using a low background data sample of $9.7 \times 1 0^{5}$ $J I ¨ \to I^^{3} I^\cdot^{'}$ , $I^\cdot^{'} \to I^^{3} I ¨ ^{+} I ¨ ^{-}$ events, which are 2 orders of magnitude larger than those from…

Measurements of the Branching Fractions of the Singly-Cabibbo-Suppressed Decays $D^{0} \to I ¨ I^\cdot$ , $I^\cdot^{(')} I ¨ ^{0}$ and $I^\cdot^{(')} I^\cdot$

M. Ablikim, M. N. Achasov, S. Ahmed +435

By analyzing a data sample of 2.93 fb $^{- 1}$ collected at $s =$ 3.773 GeV with the BESIII detector operated at the BEPCII storage rings, we measure the branching fractions ${\…

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…

Observation of $a_{0}^{0} (980)$ - $f_{0} (980)$ Mixing

M. Ablikim, M. N. Achasov, S. Ahmed +436

We report the first observation of $a_{0}^{0} (980)$ - $f_{0} (980)$ mixing in the decays of $J / I ¨ \to I ¨ f_{0} (980) \to I ¨ a_{0}^{0} (980) \to I ¨ I^\cdot I ¨ ^{0}$ and $Ï_{c1}\to a^{0}_{0}(980)Ï^{0}\…

Search for the rare decays $J / I ¨ \to D^{0} e^{+} e^{-} + c . c .$ and $I ¨ (3686) \to D^{0} e^{+} e^{-} + c . c .$

M. Ablikim, M. N. Achasov, S. Ahmed +436

Using the data samples of $(1310.6 \pm 7.2) \times 1 0^{6}$ $J / I ¨ $ events and $(448.1 \pm 2.9) \times 1 0^{6}$ $I ¨ (3686)$ events collected with the BESIII detector, we search for the rare…

Branching fraction measurement of $J / I ¨ \to K_{S} K_{L}$ and search for $J / I ¨ \to K_{S} K_{S}$

BESIII Collaboration, M. Ablikim, M. N. Achasov +441

Using a sample of $1.31 \times 1 0^{9}$ $J / I ¨ $ events collected with the BESIII detector at the BEPCII collider, we study the decays of $J / I ¨ \to K_{S} K_{L}$ and $K_{S} K_{S}$ . The…

Measurement of the Absolute Branching Fraction for $I^_{c}^{+} \to I^ I^¼^{+} I^½_{I^} ¼$

M. Ablikim, M. N. Achasov, S. Ahmed +424

We report the first measurement of the absolute branching fraction for $I^_{c}^{+} \to I^ I^¼^{+} I^½_{I^} ¼$ . This measurement is based on a sample of $e^{+} e^{-}$ annihilation data at a c…

Observation of $h_{1} (1380)$ in the $J / I ¨ \to I^\cdot^{'} K K ˉ I ¨ $ Decay

M. Ablikim, M. N. Achasov, S. Ahmed +433

Using $1.31 \times 1 0^{9}$ $J / I ¨ $ events collected by the BESIII detector at the BEPCII $e^{+} e^{-}$ collider, we report the first observation of the $h_{1} (1380)$ in $J/Ï\to Î·^{\prime}…

Observation and Spin-Parity Determination of the $X (1835)$ in $J / I ¨ \to I^^{3} K_{S}^{0} K_{S}^{0} I^\cdot$

M. Ablikim, M. N. Achasov, X. C. Ai +413

We report an observation of the process $J / I ¨ \to I^^{3} X (1835) \to I^^{3} K_{S}^{0} K_{S}^{0} I^\cdot$ at low $K_{S}^{0} K_{S}^{0}$ mass with a statistical significance larger than 12.9 $I ¨ $ using a…

Observation of the $I ¨ (1^{3} D_{2})$ state in $e^{+} e^{-} \to I ¨ ^{+} I ¨ ^{-} I^^{3} I ¨ _{c 1}$ at BESIII

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

We report the observation of the $X (3823)$ in the process $e^{+} e^{-} \to I ¨ ^{+} I ¨ ^{-} X (3823) \to I ¨ ^{+} I ¨ ^{-} I^^{3} I ¨ _{c 1}$ with a statistical significance of $6.2 I ¨ $ , in data samples at center-of…

Measurement of the absolute branching fraction of $D^{+} \to K ˉ^{0} e^{+} I^½_{e}$ via $K ˉ^{0} \to I ¨ ^{0} I ¨ ^{0}$

M. Ablikim, M. N. Achasov, X. C. Ai +419

By analyzing 2.93 fb $^{- 1}$ data collected at the center-of-mass energy $s = 3.773$ GeV with the BESIII detector, we measure the absolute branching fraction of the semileptonic…

Cross section measurements of $e^{+} e^{-} \to p p ˉ I ¨ ^{0}$ at center-of-mass energies between 4.008 and 4.600 GeV

M. Ablikim, M. N. Achasov, S. Ahmed +429

Based on $e^{+} e^{-}$ annihilation data samples collected with the BESIII detector at the BEPCII collider at 13 center of mass energies from 4.008 to 4.600 GeV, measurements of the Bor…

Observation of the Dalitz Decay $I^\cdot^{'} \to I^^{3} e^{+} e^{-}$

M. Ablikim, M. N. Achasov, X. C. Ai +410

We report the first observation of the Dalitz decay $I^\cdot^{'} \to I^^{3} e^{+} e^{-}$ , based on a data sample of 1.31 billion $J / I ¨ $ events collected with the BESIII detector. The $I^\cdot^{'}$ mesons ar…

Study of the decays $D^{+} \to I^\cdot^{(')} e^{+} I^½_{e}$

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

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

Precise measurement of the $e^{+} e^{-} \to I ¨ ^{+} I ¨ ^{-} J / I ¨ $ cross section at center-of-mass energies from 3.77 to 4.60 GeV

M. Ablikim, M. N. Achasov, X. C. Ai +412

The cross section for the process $e^{+} e^{-} \to I ¨ ^{+} I ¨ ^{-} J / I ¨ $ is measured precisely at center-of-mass energies from 3.77 to 4.60~GeV using 9~fb $^{- 1}$ of data collected with the BESII…

Search for the isospin violating decay $Y (4260) \to J / I ¨ I^\cdot I ¨ ^{0}$

M. Ablikim, M. N. Achasov, X. C. Ai +410

Using data samples collected at center of mass energies of $s$ = 4.009, 4.226, 4.257, 4.358, 4.416 and 4.599 GeV with the BESIII detector operating at the BEPCII storage rin…

Study of $J / I ¨ $ and $I ¨ (3686)$ decay to $I^ I^ˉ $ and $I^£^{0} I^ˉ £^{0}$ final states

BESIII Collaboration, M. Ablikim, M. N. Achasov +426

Using $1310.6 \times 1 0^{6}$ $J / I ¨ $ and $447.9 \times 1 0^{6}$ $I ¨ (3686)$ events collected with the BESIII detector at the BEPCII $e^{+} e^{-}$ collider, the branching fractions and the angu…

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

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

The decay $J / I ¨ \to I^^{3} I^^{3} I ¨ $ is studied using a sample of $1.31 \times 1 0^{9}$ $J / I ¨ $ events collected with the BESIII detector. Two structures around 1475 MeV/c $^{2}$ and 1835…

Observation of $h_{c}$ radiative decay $h_{c} \to I^^{3} I^\cdot^{'}$ and evidence for $h_{c} \to I^^{3} I^\cdot$

M. Ablikim, M. N. Achasov, X. C. Ai +420

A search for radiative decays of the $P$ -wave spin singlet charmonium resonance $h_{c}$ is performed based on $4.48 \times 1 0^{8}$ $I ¨ ^{'}$ events collected with the BESIII detector op…

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 $s = 3.773$ ~GeV with the BESIII detector oper…

Analysis of $D^{+} \to K ˉ^{0} e^{+} I^½_{e}$ and $D^{+} \to I ¨ ^{0} e^{+} I^½_{e}$ Semileptonic Decays

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

Using 2.93~fb $^{- 1}$ of data taken at 3.773 GeV with the BESIII detector operated at the BEPCII collider, we study the semileptonic decays $D^{+} \to K ˉ^{0} e^{+} I^½_{e}$ and $D^+ \to Ï…

Measurements of the absolute branching fractions for $D_{s}^{+} \to I^\cdot e^{+} I^½_{e}$ and $D_{s}^{+} \to I^\cdot^{'} e^{+} I^½_{e}$

M. Ablikim, M. N. Achasov, X. C. Ai +412

By analyzing 482 pb $^{- 1}$ of $e^{+} e^{-}$ collision data collected at $s = 4.009$ GeV with the BESIII detector at the BEPCII collider, we measure the absolute branching fractions…

hep-ex2019

Evidence of a resonant structure in the $e^{+} e^{-} \to I ¨ ^{+} D^{0} D^{*-}$ cross section between 4.05 and 4.60 GeV

M. Ablikim, M. N. Achasov, S. Ahmed +435

The cross section of the process $e^{+} e^{-} \to I ¨ ^{+} D^{0} D^{*-}$ for center-of-mass energies from 4.05 to 4.60~GeV is measured precisely using data samples collected with the BESIII dete…

First measurement of $e^{+} e^{-} \to p K_{S}^{0} n ˉ K^{-} + c . c .$ above open charm threshold

BESIII Collaboration, M. Ablikim, M. N. Achasov +435

The process $e^{+} e^{-} \to p K_{S}^{0} n ˉ K^{-} + c . c .$ and its intermediate processes are studied for the first time, using data samples collected with the BESIII detector a…

hep-ex2020

Observation of a cross-section enhancement near mass threshold in $e^{+} e^{-} \to I^ I^ˉ $

M. Ablikim, M. N. Achasov, S. Ahmed +428

The process $e^{+} e^{-} \to I^ I^ˉ $ is studied using data samples at $s = 2.2324$ , 2.400, 2.800 and 3.080 GeV collected with the BESIII detector operating at the BEPCI…

Observation of $e^{+} e^{-} \to I^\cdot^{'} J / I ¨ $ at center-of-mass energies between 4.189 and 4.600 GeV

M. Ablikim, M. N. Achasov, S. Ahmed +428

The process $e^{+} e^{-} \to I^\cdot^{'} J / I ¨ $ is observed for the first time with a statistical significance of $8.6 I ¨ $ at center-of-mass energy $s = 4.226$ GeV and $7.3 I ¨ $ a…

Search for Baryon and Lepton Number Violation in $J / I ¨ \to I^_{c}^{+} e^{-} + c . c .$

M. Ablikim, M. N. Achasov, S. Ahmed +447

Using $1.31 \times 1 0^{9}$ $J / I ¨ $ events collected by the BESIII detector at the Beijing Electron Positron Collider, we search for the process $J / I ¨ \to I^_{c}^{+} e^{-} + c . c .$ for the first tim…

Improved measurements of branching fractions for $I^\cdot_{c} \to I ¨ I ¨ $ and $I ¨ I ¨ $

M. Ablikim, M. N. Achasov, X. C. Ai +419

Using $(223.7 \pm 1.4) \times 1 0^{6}$ J/ $I ¨ $ events accumulated with the BESIII detector, we study $I^\cdot_{c}$ decays to $I ¨ I ¨ $ and $I ¨ I ¨ $ final states. The branching fraction of $Î·_c\toÏÏ…

Branching fraction measurements of $I ¨ (3686) \to I^^{3} I ¨ _{c J}$

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

Using a sample of 106 million $I ¨ (3686)$ decays, the branching fractions of $I ¨ (3686) \to I^^{3} I ¨ _{c 0}, I ¨ (3686) \to I^^{3} I ¨ _{c 1}$ , and $I ¨ (3686) \to I^^{3} I ¨ _{c 2}$ are measured with improve…

Measurements of $I ¨ (3686) \to K^{-} I^ I^ˉ ^{+} + c . c .$ and $I ¨ (3686) \to I^^{3} K^{-} I^ I^ˉ ^{+} + c . c$

BESIII Collaboration, M. Ablikim, M. N. Achasov +411

Using a sample of $1.06\times10^8\ \psip$ events produced in $e^{+} e^{-}$ collisions at $s$ = 3.686 GeV and collected with the BESIII detector at the BEPCII collider, we present…

Observation of $I ¨ (3686) \to n n ˉ$ and improved measurement of $I ¨ (3686) \to p p ˉ$

M. Ablikim, M. N. Achasov, S. Ahmed +423

We observe the decay $I ¨ (3686) \to n n ˉ$ for the first time and measure $I ¨ (3686) \to p p ˉ$ with improved accuracy by using $1.07 \times 1 0^{8}$ $I ¨ (3686)$ events collected…

Measurement of absolute branching fraction of the inclusive decay $I^_{c}^{+} \to I^ + X$

BESIII Collaboration, M. Ablikim, M. N. Achasov +446

Based on an $e^{+} e^{-}$ collision data sample corresponding to an integrated luminosity of 567 $pb^{- 1}$ taken at the center-of-mass energy of $s = 4.6$ GeV with the BESI…

Precision measurement of the integrated luminosity of the data taken by BESIII at center of mass energies between 3.810 GeV and 4.600 GeV

M. Ablikim, M. N. Achasov, X. C. Ai +408

From December 2011 to May 2014, about 5 $f b^{- 1}$ of data were taken with the BESIII detector at center-of-mass energies between 3.810 GeV and 4.600 GeV to study the charmonium…

Study of $D^{+} \to K^{-} I ¨ ^{+} e^{+} I^½_{e}$

M. Ablikim, M. N. Achasov, X. C. Ai +412

We present an analysis of the decay $D^{+} \to K^{-} I ¨ ^{+} e^{+} I^½_{e}$ based on data collected by the BESIII experiment at the $I ¨ (3770)$ resonance. Using a nearly background-free sam…

Measurement of the $e^{+} e^{-} \to I^\cdot J / I ¨ $ cross section and search for $e^{+} e^{-} \to I ¨ ^{0} J / I ¨ $ at center-of-mass energies between 3.810 and 4.600~GeV

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

Using data samples collected with the BESIII detector operating at the BEPCII collider at center-of-mass energies from 3.810 to 4.600 GeV, we perform a study of $e^{+}e^{-} \to Î·J…

Observation of $e^{+} e^{-} \to I^\cdot h_{c}$ at center-of-mass energies from 4.085 to 4.600 GeV

BESIII collaboration, M. Ablikim, M. N. Achasov +425

We observe for the first time the process $e^{+} e^{-} \to I^\cdot h_{c}$ with data collected by the BESIII experiment. Significant signals are observed at the center-of-mass energy…

Observation of the Singly Cabibbo-Suppressed Decay $D^{+} \to I ¨ I ¨ ^{+}$ and Evidence for $D^{0} \to I ¨ I ¨ ^{0}$

BESIII Collaboration, M. Ablikim, M. N. Achasov +414

Based on 2.93 fb $^{- 1}$ $e^{+} e^{-}$ collision data taken at center-of-mass energy of 3.773 GeV by the BESIII detector, we report searches for the singly Cabibbo-suppressed decays $D^{…

Study of two-photon decays of pseudoscalar mesons via $J / I ¨ $ radiative decays

BESIII Collaboration, M. Ablikim, M. N. Achasov +447

Using a sample of $4.48 \times 1 0^{8}$ $I ¨ (3686)$ events collected with the BESIII detector at the BEPCII collider, we study the two-photon decays of the pseudoscalar mesons $I ¨ ^{0}$ ,…

Determination of the number of $I ¨ (3686)$ events at BESIII

M. Ablikim, M. N. Achasov, S. Ahmed +430

The numbers of $I ¨ (3686)$ events accumulated by the BESIII detector for the two rounds of data taking during 2009 and 2012 are determined to be $(107.0 \pm 0.8) \times 1 0^{6}$ and $(341…

Confirmation of a charged charmoniumlike state $Z_{c} (3885)^{\mp}$ in $e^{+} e^{-} \to I ¨ ^{\pm} (D D ˉ^{*})^{\mp}$ with double $D$ tag

BESIII Collaboration, M. Ablikim, M. N. Achasov +400

We present a study of the process $e^{+} e^{-} \to I ¨ ^{\pm} (D D ˉ^{*})^{\mp}$ using data samples of 1092~pb $^{- 1}$ at $s = 4.23$ ~GeV and 826~pb $^{- 1}$ at $s = 4.26$ ~GeV collect…

Evidence for $e^{+} e^{-} \to I^^{3} I^\cdot_{c} (1 S)$ at center-of-mass energies between 4.01 and 4.60 GeV

BESIII Collaboration, M. Ablikim, M. N. Achasov +439

We present first evidence for the process $e^{+} e^{-} \to I^^{3} I^\cdot_{c} (1 S)$ at six center-of-mass energies between 4.01 and 4.60~GeV using data collected by the BESIII experiment operating at…

Measurement of $e^{+} e^{-} \to I ¨ ^{0} I ¨ ^{0} I ¨ (3686)$ at $s$ from 4.009 to 4.600 GeV and observation of a neutral charmoniumlike structure

M. Ablikim, M. N. Achasov, S. Ahmed +436

Using $e^{+} e^{-}$ collision data collected with the BESIII detector at the BEPCII collider corresponding to an integrated luminosity of 5.2 $f b^{- 1}$ at center-of-mass energies ($…

Observation of $e^{+} e^{-} \to I ¨ I ¨ _{c 1}$ and $I ¨ I ¨ _{c 2}$ at $s$ =4.600 GeV

M. Ablikim, M. N. Achasov, S. Ahmed +427

Using a data sample collected with the BESIII detector operating at the BEPCII storage ring at a center-of-mass energy of $s = 4.600$ GeV, we search for the production of $e^{…

Measurement of the form factors in the decay $D^{+} \to I ¨ e^{+} I^½_{e}$ and search for the decay $D^{+} \to I ¨ e^{+} I^½_{e}$

M. Ablikim, M. N. Achasov, X. C. Ai +398

Using 2.92 fb $^{- 1}$ of electron-positron annihilation data collected at a center-of-mass energy of $s = 3.773$ GeV with the BESIII detector, we present an improved measureme…

Improved measurement of the absolute branching fraction of $D^{+} \to K ˉ^{0} I^¼^{+} I^½_{I^} ¼$

M. Ablikim, M. N. Achasov, X. C. Ai +419

By analyzing 2.93 fb $^{- 1}$ of data collected at $s = 3.773$ GeV with the BESIII detector, we measure the absolute branching fraction ${\mathcal B}(D^{+}\rightarrow\bar K^0Î¼^{…

Measurement of the branching fraction for $I ¨ (3770) \to I^^{3} I ¨ _{c 0}$

BESIII Collaboration, M. Ablikim, M. N. Achasov +409

By analyzing a data set of 2.92 fb $^{- 1}$ of $e^{+} e^{-}$ collision data taken at $s = 3.773 GeV$ and 106.41 $\times 1 0^{6}$ $I ¨ (3686)$ decays taken at $s = 3.686 GeV$ …

Observation of a Neutral Structure near the $D D ˉ^{}$ Mass Threshold in $e^{+} e^{-} \to (D D ˉ^{})^{0} I ¨ ^{0}$ at $s$ = 4.226 and 4.257 GeV

BESIII Collaboration, M. Ablikim, M. N. Achasov +400

A neutral structure in the $D D ˉ^{*}$ system around the $D D ˉ^{*}$ mass threshold is observed with a statistical significance greater than 10 $I ¨ $ in the processes $e^{+}e^{…

Amplitude analysis of the $I ¨ _{c 1} \to I^\cdot I ¨ ^{+} I ¨ ^{-}$ decays

M. Ablikim, M. N. Achasov, S. Ahmed +430

Using $448.0 \times 1 0^{6}$ ~ $I ¨ (3686)$ events collected with the BESIII detector, an amplitude analysis is performed for $I ¨ (3686) \to I^^{3} I ¨ _{c 1}$ , $I ¨ _{c 1} \to I^\cdot I ¨ ^{+} I ¨ ^{-}$ decays. The mo…

An amplitude analysis of the $I ¨ ^{0} I ¨ ^{0}$ system produced in radiative $J / I ¨ $ decays

BESIII Collaboration, M. Ablikim, M. N. Achasov +417

An amplitude analysis of the $I ¨ ^{0} I ¨ ^{0}$ system produced in radiative $J / I ¨ $ decays is presented. In particular, a piecewise function that describes the dynamics of the $Ï^{0}Ï…

Observation of pseudoscalar and tensor resonances in $J / I ¨ \to I^^{3} I ¨ I ¨ $

M. Ablikim, M. N. Achasov, X. C. Ai +406

Based on a sample of $(1310.6 \pm 10.5) \times 1 0^{6}$ $J / I ¨ $ events collected with the BESIII detector operating at the BEPCII storage ring, a partial wave analysis of the decay $…

Evidence of Two Resonant Structures in $e^{+} e^{-} \to I ¨ ^{+} I ¨ ^{-} h_{c}$

M. Ablikim, M. N. Achasov, S. Ahmed +424

The cross sections of $e^{+} e^{-} \to I ¨ ^{+} I ¨ ^{-} h_{c}$ at center-of-mass energies from 3.896 to 4.600 GeV are measured using data samples collected with the BESIII detector operating…

Observation of the electromagnetic doubly OZI-suppressed decay $J / I ¨ \to I ¨ I ¨ ^{0}$

BESIII Collaboration, M. Ablikim, M. N. Achasov +411

Using a sample of $1.31$ billion $J / I ¨ $ events accumulated with the BESIII detector at the BEPCII collider, we report the observation of the decay $J / I ¨ \to I ¨ I ¨ ^{0}$ , which…

Study of $J / I ¨ $ and $I ¨ (3686) \to I^£ (1385)^{0} I^ˉ £ (1385)^{0}$ and $I^^{0} I^ˉ ^{0}$

BESIII Collaboration, M. Ablikim, M. N. Achasov +426

We study the decays of $J / I ¨ $ and $I ¨ (3686)$ to the final states $I^£ (1385)^{0} I^ˉ £ (1385)^{0}$ and $I^^{0} I^ˉ ^{0}$ based on a single baryon tag method using data samples of $(131…

Measurement of the Matrix Elements for the Decays $I^\cdot \to I ¨ ^{+} I ¨ ^{-} I ¨ ^{0}$ and $I^\cdot / I^\cdot^{'} \to I ¨ ^{0} I ¨ ^{0} I ¨ ^{0}$

M. Ablikim, M. N. Achasov, X. C. Ai +413

Based on a sample of $1.31 \times 1 0^{9}$ $J / I ¨ $ events collected with the BESIII detector at the BEPCII collider, Dalitz plot analyses of selected 79,625 $Î·\rightarrowÏ^{+}Ï^{-}Ï…

Search for the Radiative Leptonic Decay $D^{+} \to I^^{3} e^{+} I^½_{e}$

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

Using an electron-positron collision data sample of 2.93 fb $^{- 1}$ collected at a center-of-mass energy of $s = 3.773$ GeV with the BESIII detector, we present the first searc…

Measurement of cross sections of the interactions $e^{+} e^{-} \to I ¨ I ¨ I ¨ $ and $e^{+} e^{-} \to I ¨ I ¨ I ¨ $ at center-of-mass energies from 4.008 to 4.600 GeV

BESIII Collaboration, M. Ablikim, M. N. Achasov +426

Using data samples collected with the BESIII detector at the BEPCII collider at six center-of-mass energies between 4.008 and 4.600 GeV, we observe the processes $e^+e^-\rightarrow…

Measurements of the branching fractions for $D^{+} \to K_{S}^{0} K_{S}^{0} K^{+}$ , $K_{S}^{0} K_{S}^{0} I ¨ ^{+}$ and $D^{0} \to K_{S}^{0} K_{S}^{0}$ , $K_{S}^{0} K_{S}^{0} K_{S}^{0}$

M. Ablikim, M. N. Achasov, S. Ahmed +428

By analyzing $2.93 f b^{- 1}$ of data taken at the $I ¨ (3770)$ resonance peak with the BESIII detector, we measure the branching fractions for the hadronic decays $D^+\to K^0_SK^…