Qingnian Xu

activity

20092020

Λ

hyperon polarization in nuclear collisions: evidence for the most vortical fluid

920 citations · 2.6k across the 39 of their papers we have counts for

collaborators

39 papers

nucl-ex2020★ 55 cited

Measurement of inclusive charged-particle jet production in Au+Au collisions at $s_{N N}$ =200 GeV

STAR Collaboration, J. Adam, L. Adamczyk +352

The STAR Collaboration at the Relativistic Heavy Ion Collider reports the first measurement of inclusive jet production in peripheral and central Au+Au collisions at $\sqrt{s_{NN}}…

hep-ex2019★ 32 cited

Search for $C P$ violation and observation of $P$ violation in $Λ_{b}^{0} \to p π^{-} π^{+} π^{-}$ decays

LHCb collaboration, R. Aaij, C. Abellán Beteta +902

A search for $C P$ violation in the $Λ_{b}^{0} \to p π^{-} π^{+} π^{-}$ decay is performed using LHCb data corresponding to an integrated luminosity of 6.6 $f b^{- 1}$ collected in $pp$ coll…

nucl-ex2019★ 37 cited

Collision Energy Dependence of $p_{t}$ Correlations in Au+Au Collisions at RHIC

STAR Collaboration, J. Adam, L. Adamczyk +333

We present two-particle $p_{t}$ correlations as a function of event centrality for Au+Au collisions at $s_{NN}$ = 7.7, 11.5, 14.5, 19.6, 27, 39, 62.4, and 200 GeV at…

hep-ex2018★ 14 cited

Observation of $D_{s}^{+} \to p n ˉ$ and confirmation of its large branching fraction

BESIII Collaboration, M. Ablikim, M. N. Achasov +455

The baryonic decay $D_{s}^{+} \to p n ˉ$ is observed, and the corresponding branching fraction is measured to be $(1.21 \pm 0.10 \pm 0.05) \times 1 0^{- 3}$ , where the first uncertai…

hep-ex2018★ 11 cited

Observation of the $W$ -Annihilation Decay $D_{s}^{+} \to ω π^{+}$ and Evidence for $D_{s}^{+} \to ω K^{+}$

M. Ablikim, M. N. Achasov, S. Ahmed +461

We report on the observation of the $W$ -annihilation decay $D_{s}^{+} \to ω π^{+}$ and the evidence for $D_{s}^{+} \to ω K^{+}$ with a data sample corresponding to an…

hep-ex2018★ 3 cited

Search for the rare decay of $ψ (3686) \to Λ_{c}^{+} p e^{+} e^{-} + c . c .$ at BESIII

BESIII collaboration

Based on a data sample of $(448.1 \pm 2.9) \times 1 0^{6} ψ (3686)$ decays collected with the BESIII experiment, a search for the flavor changing neutral current transition $ψ(3686)\righta…

hep-ex2017★ 6 cited

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

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

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

nucl-ex2017★ 920 cited

Global $Λ$ hyperon polarization in nuclear collisions: evidence for the most vortical fluid

STAR Collaboration

The extreme temperatures and energy densities generated by ultra-relativistic collisions between heavy nuclei produce a state of matter with surprising fluid properties. Non-centra…

nucl-ex2016★ 43 cited

Di-Jet Imbalance Measurements at $s_{N N} = 200$ GeV at STAR

STAR Collaboration, L. Adamczyk, J. K. Adkins +334

We report the first di-jet transverse momentum asymmetry measurements from Au+Au and p+p collisions at RHIC. The two highest-energy back-to-back jets reconstructed from fragments w…

nucl-ex2016★ 29 cited

Upsilon production in U+U collisions at 193 GeV with the STAR experiment

STAR Collaboration, L. Adamczyk, J. K. Adkins +335

We present a measurement of the inclusive production of Upsilon mesons in U+U collisions at 193 GeV at mid-rapidity (|y| < 1). Previous studies in central Au+Au collisions at 200 G…

nucl-ex2016★ 17 cited

$J / ψ$ production at low transverse momentum in p+p and d+Au collisions at $s_{N N}$ = 200 GeV

STAR Collaboration, L. Adamczyk, J. K. Adkins +328

We report on the measurement of $J / ψ$ production in the dielectron channel at mid-rapidity (|y|<1) in p+p and d+Au collisions at $s_{N N}$ = 200 GeV from the STAR experi…

hep-ex2015

Measurements of $π^{0} π^{0}$ production and form factors for $f_{0} (980)$ and $f_{2} (1270)$ in single-tag two-photon process

Qingnian Xu

We report a measurement of differential cross section of $π^{0}$ pair production in single-tag two-photon collisions. These results are obtained with 759 $f b^{- 1}$ of the data colle…

nucl-ex2015★ 93 cited

Measurement of the transverse single-spin asymmetry in $p^{↑} + p \to W^{\pm} / Z^{0}$ at RHIC

STAR Collaboration, L. Adamczyk, J. K. Adkins +326

We present the measurement of the transverse single-spin asymmetry of weak boson production in transversely polarized proton-proton collisions at $s = 500 GeV$ by the…

nucl-ex2015★ 138 cited

Azimuthal anisotropy in U+U and Au+Au collisions at RHIC

STAR Collaboration, L. Adamczyk, J. K. Adkins +325

Collisions between prolate uranium nuclei are used to study how particle production and azimuthal anisotropies depend on initial geometry in heavy-ion collisions. We report the two…

hep-ph2014★ 2 cited

Suggestion for measuring the weak dipole moment of $τ$ lepton at Z-factory

Qing-Jun Xu, Chao-Hsi Chang

Three new observables for Z-factory to measure the weak dipole moment of $τ$ lepton ( $d_{w}^{τ}$ ) are proposed. As those observables employed at LEP-I, the new observables depend on th…

nucl-ex2014★ 4 cited

Charged-to-neutral correlation at forward rapidity in Au+Au collisions at $s_{N N}$ =200 GeV

STAR Collaboration, N. M. Abdelwahab, L. Adamczyk +345

Event-by-event fluctuations of the ratio of inclusive charged to photon multiplicities at forward rapidity in Au+Au collision at $s_{N N}$ =200 GeV have been studied. Dominant…

nucl-ex2014★ 221 cited

Observation of $D^{0}$ meson nuclear modifications in Au+Au collisions at $s_{_{NN}}$ = 200 GeV

L. Adamczyk, J. K. Adkins, G. Agakishiev +352

We report the first measurement of charmed-hadron ( $D^{0}$ ) production via the hadronic decay channel ( $D^{0} \to K^{-} + π^{+}$ ) in Au+Au collisions at $s_{_{NN}}$ …

hep-ex2014★ 10 cited

Search for the rare decays $J / ψ \to D_{s}^{-} ρ^{+}$ and $J / ψ \to D^{0} K^{* 0}$

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

A search for the rare decays of $J / ψ \to D_{s}^{-} ρ^{+} + c . c .$ and $J / ψ \to D^{0} K^{* 0} + c . c .$ is performed with a data sample of 225.3 million $J / ψ$ events co…

nucl-ex2013★ 107 cited

Suppression of Upsilon Production in d+Au and Au+Au Collisions at sqrt(s_NN) = 200 GeV

L. Adamczyk, J. K. Adkins, G. Agakishiev +354

We report measurements of Upsilon meson production in p+p, d+Au, and Au+Au collisions using the STAR detector at RHIC. We compare the Upsilon yield to the measured cross section in…

hep-ex2013★ 27 cited

Measurement of $η^{'} \to π^{+} π^{-} e^{+} e^{-}$ and $η^{'} \to π^{+} π^{-} μ^{+} μ^{-}$

BESIII Collaboration, M. Ablikim, M. N. Achasov +361

Based on a sample of 225.3 million J/ψevents accumulated with the BESIII detector at the BEPCII, the decays of η' to pi+pi-l+l- are studied via J/ψto γη'. A clear η' signal is obse…

nucl-ex2013★ 1 cited

Jet-Hadron Correlations in sqrt{s_{NN}} = 200 GeV p+p and Central Au+Au Collisions

STAR Collaboration, L. Adamczyk, J. K. Adkins +351

Azimuthal angular correlations of charged hadrons with respect to the axis of a reconstructed (trigger) jet in Au+Au and p+p collisions at $s_{NN} = 200 GeV$ i…

nucl-ex2013★ 11 cited

Fluctuations of charge separation perpendicular to the event plane and local parity violation in sqrt(sNN)=200 GeV Au+Au collisions at RHIC

STAR Collaboration, L. Adamczyk, J. K. Adkins +363

Previous experimental results based on data (15 million events) collected by the STAR detector at RHIC suggest event-by-event charge separation fluctuations perpendicular to the ev…

nucl-ex2013★ 24 cited

Freeze-out Dynamics via Charged Kaon Femtoscopy in sqrt(sNN)=200 GeV Central Au+Au Collisions

STAR Collaboration, L. Adamczyk, J. K. Adkins +363

We present measurements of three-dimensional correlation functions of like-sign low transverse momentum kaon pairs from sqrt(sNN)=200 GeV Au+Au collisions. A Cartesian surface-sphe…

nucl-ex2013★ 107 cited

Observation of an energy-dependent difference in elliptic flow between particles and anti-particles in relativistic heavy ion collisions

L. Adamczyk, J. K. Adkins, G. Agakishiev +362

Elliptic flow ( $v_{2}$ ) values for identified particles at mid-rapidity in Au+Au collisions, measured by the STAR experiment in the Beam Energy Scan at RHIC at $s_{N N} =$ 7.7…

Measurement of inclusive charged-particle jet production in Au+Au collisions at sNN​​=200 GeV

Search for CP violation and observation of P violation in Λb0​→pπ−π+π− decays

Collision Energy Dependence of pt​ Correlations in Au+Au Collisions at RHIC

Observation of Ds+​→pnˉ and confirmation of its large branching fraction

Observation of the W-Annihilation Decay Ds+​→ωπ+ and Evidence for Ds+​→ωK+

Search for the rare decay of ψ(3686)→Λc+​p​e+e−+c.c. at BESIII

Branching fraction measurement of J/ψ→KS​KL​ and search for J/ψ→KS​KS​

Global Λ hyperon polarization in nuclear collisions: evidence for the most vortical fluid

Di-Jet Imbalance Measurements at sNN​​=200 GeV at STAR