Publications (44)
Measurement of the and $Z/γ^* \to e^+e^-$ Production Cross Sections at Mid-rapidity in Proton-Proton Collisions at = 500 GeV
STAR Collaboration, G. Agakishiev, M. M. Aggarwal +346
We report measurements of the charge-separated and $Z/γ^* \to e^+e^-$ production cross sections at mid-rapidity in proton-proton collision…
System size dependence of transverse momentum correlations at 62.4 and 200 GeV at the BNL Relativistic Heavy Ion Collider
STAR Collaboration, L. Adamczyk, J. K. Adkins +363
We present a study of the average transverse momentum () fluctuations and correlations for charged particles produced in Cu+Cu collisions at midrapidity for $\sqrt{s_{NN…
K*0 production in Cu+Cu and Au+Au collisions at \sqrt{s_NN} = 62.4 GeV and 200 GeV
M. M. Aggarwal, Z. Ahammed, A. V. Alakhverdyants +383
We report on K*0 production at mid-rapidity in Au+Au and Cu+Cu collisions at \sqrt{s_{NN}} = 62.4 and 200 GeV collected by the Solenoid Tracker at RHIC (STAR) detector. The K*0 is…
Precision Measurement of the Weak Charge of the Proton
D. Androic, D. S. Armstrong, A. Asaturyan +96
The fields of particle and nuclear physics have undertaken extensive programs to search for evidence of physics beyond that explained by current theories. The observation of the Hi…
System size and energy dependence of near-side di-hadron correlations
STAR Collaboration, G. Agakishiev, M. M. Aggarwal +353
Two-particle azimuthal () and pseudorapidity () correlations using a trigger particle with large transverse momentum () in +Au, Cu+Cu and Au+Au collisions at $\…
Elliptic flow of identified hadrons in Au+Au collisions at 7.7--62.4 GeV
L. Adamczyk, J. K. Adkins, G. Agakishiev +362
Measurements of the elliptic flow, , of identified hadrons (, , , , , , , , , , , $\bar…
Third Harmonic Flow of Charged Particles in Au+Au Collisions at sqrtsNN = 200 GeV
STAR Collaboration, L. Adamczyk, J. K. Adkins +359
We report measurements of the third harmonic coefficient of the azimuthal anisotropy, v_3, known as triangular flow. The analysis is for charged particles in Au+Au collisions at sq…
The Q_weak Experimental Apparatus
Qweak Collaboration, T. Allison, M. Anderson +126
The Jefferson Lab Q_weak experiment determined the weak charge of the proton by measuring the parity-violating elastic scattering asymmetry of longitudinally polarized electrons fr…
An Experimental Exploration of the QCD Phase Diagram: The Search for the Critical Point and the Onset of De-confinement
STAR Collaboration, M. M. Aggarwal, Z. Ahammed +380
The QCD phase diagram lies at the heart of what the RHIC Physics Program is all about. While RHIC has been operating very successfully at or close to its maximum energy for almost…
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 () values for identified particles at mid-rapidity in Au+Au collisions, measured by the STAR experiment in the Beam Energy Scan at RHIC at 7.7…
Higher Moments of Net-proton Multiplicity Distributions at RHIC
M. M. Aggarwal, Z. Ahammed, A. V. Alakhverdyants +380
We report the first measurements of the kurtosis (κ), skewness (S) and variance (Ï^2) of net-proton multiplicity (N_p - N_pbar) distributions at midrapidity for Au+Au collisions…
Strange baryon resonance production in GeV and collisions
The STAR collaboration, B. I. Abelev, M. M. Aggarwal +375
We report the measurements of and production in and collisions at GeV from the STAR collaboration. The yields and the $p_{…
Measurements of Dihadron Correlations Relative to the Event Plane in Au+Au Collisions at GeV
H. Agakishiev, M. M. Aggarwal, Z. Ahammed +366
Dihadron azimuthal correlations containing a high transverse momentum () trigger particle are sensitive to the properties of the nuclear medium created at RHIC through the str…
Measurement of longitudinal spin asymmetries for weak boson production in polarized proton-proton collisions at RHIC
STAR Collaboration, L. Adamczyk, J. K. Adkins +355
We report measurements of single- and double- spin asymmetries for and $Z/γ^*$ boson production in longitudinally polarized collisions at GeV by t…
Strangeness Enhancement in Cu+Cu and Au+Au Collisions at \sqrt{s_{NN}} = 200 GeV
STAR Collaboration, H. Agakishiev, M. M. Aggarwal +369
We report new STAR measurements of mid-rapidity yields for the , , , , , , particles in Cu+Cu collisions at \sNN{200…
The DarkLight Experiment: A Precision Search for New Physics at Low Energies
J. Balewski, J. Bernauer, J. Bessuille +37
We describe the current status of the DarkLight experiment at Jefferson Laboratory. DarkLight is motivated by the possibility that a dark photon in the mass range 10 to 100 MeV/c$^…
Neutral pion cross section and spin asymmetries at intermediate pseudorapidity in polarized proton collisions at sqrt{s} = 200 GeV
STAR Collaboration, L. Adamczyk, J. K. Adkins +360
The differential cross section and spin asymmetries for neutral pions produced within the intermediate pseudorapidity range 0.8 < η < 2.0 in polarized proton-proton collisions at…
Rydberg trimers and excited dimers bound by internal quantum reflection
V. Bendkowsky, B. Butscher, J. Nipper +8
Quantum reflection is a pure wave phenomena that predicts reflection of a particle at a changing potential for cases where complete transmission occurs classically. For a chemical…
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…
Directed and elliptic flow of charged particles in Cu+Cu collisions at 22.4 GeV
G. Agakishiev, M. M. Aggarwal, Z. Ahammed +366
This paper reports results for directed flow and elliptic flow of charged particles in Cu+Cu collisions at 22.4 GeV at the Relativistic Heavy Ion C…
Early Results from the Qweak Experiment
D. Androic, D. S. Armstrong, A. Asaturyan +94
A subset of results from the recently completed Jefferson Lab Qweak experiment are reported. This experiment, sensitive to physics beyond the Standard Model, exploits the small par…
DarkLight: A Search for Dark Forces at the Jefferson Laboratory Free-Electron Laser Facility
J. Balewski, J. Bernauer, W. Bertozzi +64
We give a short overview of the DarkLight detector concept which is designed to search for a heavy photon A' with a mass in the range 10 MeV/c^2 < m(A') < 90 MeV/c^2 and which deca…
Measurements of and Production in + Collisions at = 200 GeV
STAR Collaboration, L. Adamczyk, G. Agakishiev +368
We report measurements of charmed-hadron (, ) production cross sections at mid-rapidity in + collisions at a center-of-mass energy of 200 GeV by the STAR expe…
Measurement of Charge Multiplicity Asymmetry Correlations in High Energy Nucleus-Nucleus Collisions at 200 GeV
STAR Collaboration, L. Adamczyk, J. K. Adkins +360
A study is reported of the same- and opposite-sign charge-dependent azimuthal correlations with respect to the event plane in Au+Au collisions at 200 GeV. The charge multiplicity a…
Upsilon cross section in p+p collisions at sqrt(s) = 200 GeV
STAR Collaboration, B. I. Abelev, M. M. Aggarwal +381
We report on a measurement of the Upsilon(1S+2S+3S) -> e+e- cross section at midrapidity in p+p collisions at sqrt(s)=200 GeV. We find the cross section to be 114 +/- 38 (stat.) +2…
Pion femtoscopy in p+p collisions at sqrt(s)=200 GeV
M. M. Aggarwal, Z. Ahammed, A. V. Alakhverdyants +380
The STAR Collaboration at RHIC has measured two-pion correlation functions from p+p collisions at sqrt(s)=200 GeV. Spatial scales are extracted via a femtoscopic analysis of the co…
Longitudinal and transverse spin asymmetries for inclusive jet production at mid-rapidity in polarized p+p collisions at sqrt{s}=200 GeV
The STAR Collaboration, L. Adamczyk, G. Agakishiev +369
We report STAR measurements of the longitudinal double-spin asymmetry A_LL, the transverse single-spin asymmetry A_N, and the transverse double-spin asymmetries A_Sigma and A_TT fo…
Studies of di-jet survival and surface emission bias in Au+Au collisions via angular correlations with respect to back-to-back leading hadrons
H. Agakishiev, M. M. Aggarwal, Z. Ahammed +373
We report first results from an analysis based on a new multi-hadron correlation technique, exploring jet-medium interactions and di-jet surface emission bias at RHIC. Pairs of bac…
polarization in p+p collisions at = 200 GeV in STAR
STAR Collaboration, L. Adamczyk, J. K. Adkins +353
We report on a polarization measurement of inclusive mesons in the di-electron decay channel at mid-rapidity at 2 6 GeV/ in collisions at = 200…
First Determination of the Weak Charge of the Proton
Qweak Collaboration, D. Androic, D. S. Armstrong +95
The Qweak experiment has measured the parity-violating asymmetry in polarized e-p elastic scattering at Q^2 = 0.025(GeV/c)^2, employing 145 microamps of 89% longitudinally polarize…
Anomalous centrality evolution of two-particle angular correlations from Au-Au collisions at = 62 and 200 GeV
STAR Collaboration, G. Agakishiev, M. M. Aggarwal +350
We present two-dimensional (2D) two-particle angular correlations on relative pseudorapidity and azimuth for charged particles from Au-Au collisions at $\sqrt{s_{\rm NN}}…
Single Spin Asymmetry in Polarized Proton-Proton Elastic Scattering at GeV
STAR Collaboration, L. Adamczyk, G. Agakishiev +365
We report a high precision measurement of the transverse single spin asymmetry at the center of mass energy GeV in elastic proton-proton scattering by the STAR…
Transverse Single-Spin Asymmetry and Cross-Section for pi0 and eta Mesons at Large Feynman-x in Polarized p+p Collisions at sqrt(s)=200 GeV
The STAR Collaboration, L. Adamczyk, G. Agakishiev +361
Measurements of the differential cross-section and the transverse single-spin asymmetry, A_N, vs. x_F for pi0 and eta mesons are reported for 0.4 < x_F < 0.75 at an average pseudor…
Azimuthal di-hadron correlations in d+Au and Au+Au collisions at GeV from STAR
STAR Collaboration, M. M. Aggarwal, Z. Ahammed +384
Yields, correlation shapes, and mean transverse momenta \pt{} of charged particles associated with intermediate to high-\pt{} trigger particles ($2.5 < \pt < 10$ \GeVc) in d+Au and…
The Forward GEM Tracker of STAR at RHIC
F. Simon, J. Balewski, R. Fatemi +11
The STAR experiment at the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory (BNL) is in the process of designing and constructing a forward tracking system…
Di-electron spectrum at mid-rapidity in collisions at GeV
L. Adamczyk, G. Agakishiev, M. M. Aggarwal +368
We report on mid-rapidity mass spectrum of di-electrons and cross sections of pseudoscalar and vector mesons via decays, from GeV collisions, me…
production at low in Au+Au and Cu+Cu collisions at = 200 GeV at STAR
STAR Collaboration, L. Adamczyk, J. K. Adkins +352
The $\jpsi$ $\pt$ spectrum and nuclear modification factor ($\raa$) are reported for $\pt < 5 \ \gevc$ and from 0\% to 60\% central Au+Au and Cu+Cu collisions at $\snn = 20…
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…
Energy and system-size dependence of two- and four-particle measurements in heavy-ion collisions at RHIC and their implications on flow fluctuations and nonflow
The STAR Collaboration, G. Agakishiev, M. M. Aggarwal +344
We present STAR measurements of azimuthal anisotropy by means of the two- and four-particle cumulants ( and ) for Au+Au and Cu+Cu collisions at center of…
Pion Interferometry in Au+Au and Cu+Cu Collisions at = 62.4 and 200 GeV
The STAR Collaboration, B. I. Abelev, M. M. Aggarwal +66
We present a systematic analysis of two-pion interferometry in Au+Au collisions at = 62.4 GeV and Cu+Cu collisions at = 62.4 and 200 GeV u…
Beam-Energy and System-Size Dependence of Dynamical Net Charge Fluctuations
B. I. Abelev, M. M. Aggarwal, Z. Ahammed +360
We present measurements of net charge fluctuations in collisions at 19.6, 62.4, 130, and 200 GeV, collisions at 62.4, 200…
Energy Dependence of Moments of Net-proton Multiplicity Distributions at RHIC
STAR Collaboration, L. Adamczyk, J. K. Adkins +352
We report the beam energy (\sqrt s_{NN} = 7.7 - 200 GeV) and collision centrality dependence of the mean (M), standard deviation (Ï), skewness (S), and kurtosis (κ) of the net-pr…
Design and Operation of a Windowless Gas Target Internal to a Solenoidal Magnet for Use with a Megawatt Electron Beam
S. Lee, R. Corliss, I. FriÅ¡ÄiÄ +37
A windowless hydrogen gas target of nominal thickness cm is an essential component of the DarkLight experiment, which is designed to utilize the megawatt electron…
Measurement of Sivers Asymmetries for Di-jets in \sqrt{s}=200 GeV pp Collisions at STAR
J. Balewski
Measurement of the transverse spin dependence of the di-jet opening angle in pp collisions at sqrt{s}=200 GeV has been performed by the STAR collaboration. An analyzing power consi…