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Energy Dependence of Moments of Net-Proton Multiplicity Distributions at RHIC
Adamczyk, L.,Adkins, J. K.,Agakishiev, G.,Aggarwal, M. M.,Ahammed, Z.,Alekseev, I.,Alford, J.,Anson, C. D.,Aparin, A.,Arkhipkin, D.,Aschenauer, E. C.,Averichev, G. S.,Balewski, J.,Banerjee, A.,Barnovs American Physical Society 2014 Physical Review Letters Vol.112 No.3
<P>The first experimental study is presented of a corrugated wall device that uses wakefields to remove a linear energy correlation in a relativistic electron beam (a “dechirper”). Time-resolved measurements of both longitudinal and transverse wakefields of the device are presented and compared with simulations. This study demonstrates the feasibility to employ a dechirper for precise control of the beam phase space in the next generation of free-electron-lasers.</P>
Adamczyk, L.,Adkins, J. K.,Agakishiev, G.,Aggarwal, M. M.,Ahammed, Z.,Alekseev, I.,Aparin, A.,Arkhipkin, D.,Aschenauer, E. C.,Attri, A.,Averichev, G. S.,Bai, X.,Bairathi, V.,Bellwied, R.,Bhasin, A.,Bh American Physical Society 2016 Physical review. C Vol.94 No.3
<P>We present measurements of second-order azimuthal anisotropy (v(2)) at midrapidity (vertical bar y vertical bar < 1.0) for light nuclei d, t, He-3 (for root s(NN) = 200, 62.4, 39, 27, 19.6, 11.5, and 7.7 GeV) and antinuclei <(d)over bar> (root s(NN) = 200, 62.4, 39, 27, and 19.6 GeV) and (3)(He) over bar (root s(NN) = 200 GeV) in the STAR (Solenoidal Tracker at RHIC) experiment. The v(2) for these light nuclei produced in heavy-ion collisions is compared with those for p and (p) over bar. We observe mass ordering in nuclei v(2)(p(T)) at low transverse momenta (p(T) < 2.0 GeV/c). We also find a centrality dependence of v(2) for d and <(d)over bar>. The magnitude of v(2) for t and He-3 agree within statistical errors. Light-nuclei v(2) are compared with predictions from a blast-wave model. Atomic mass number (A) scaling of light-nuclei v(2)(p(T)) seems to hold for p(T)/A < 1.5 GeV/c. Results on light-nuclei v(2) from a transport-plus-coalescence model are consistent with the experimental measurements.</P>
Adam, J.,Adamczyk, L.,Adams, J.R.,Adkins, J.K.,Agakishiev, G.,Aggarwal, M.M.,Ahammed, Z.,Ajitanand, N.N.,Alekseev, I.,Anderson, D.M.,Aoyama, R.,Aparin, A.,Arkhipkin, D.,Aschenauer, E.C.,Ashraf, M.U.,A North-Holland Pub. Co 2018 Physics letters. Section B Vol.786 No.-
<P><B>Abstract</B></P> <P>We present a measurement of inclusive J / ψ production at mid-rapidity ( | y | < 1 ) in p + p collisions at a center-of-mass energy of s = 200 GeV with the STAR experiment at the Relativistic Heavy Ion Collider (RHIC). The differential production cross section for J / ψ as a function of transverse momentum ( <SUB> p T </SUB> ) for 0 < <SUB> p T </SUB> < 14 GeV / c and the total cross section are reported and compared to calculations from the color evaporation model and the non-relativistic Quantum Chromodynamics model. The dependence of J / ψ relative yields in three <SUB> p T </SUB> intervals on charged-particle multiplicity at mid-rapidity is measured for the first time in p + p collisions at s = 200 GeV and compared with that measured at s = 7 TeV, PYTHIA8 and EPOS3 Monte Carlo generators, and the Percolation model prediction.</P>
J / ψ polarization in p + p collisions at s = 200 GeV in STAR
Adamczyk, L.,Adkins, J.K.,Agakishiev, G.,Aggarwal, M.M.,Ahammed, Z.,Alekseev, I.,Alford, J.,Anson, C.D.,Aparin, A.,Arkhipkin, D.,Aschenauer, E.C.,Averichev, G.S.,Balewski, J.,Banerjee, A.,Barnovska, Z North-Holland Pub. Co 2014 Physics letters. Section B Vol.739 No.-
<P><B>Abstract</B></P> <P>We report on a polarization measurement of inclusive J / ψ mesons in the di-electron decay channel at mid-rapidity at 2 < <SUB> p T </SUB> < 6 GeV / c in p + p collisions at s = 200 GeV . Data were taken with the STAR detector at RHIC. The J / ψ polarization measurement should help to distinguish between different models of the J / ψ production mechanism since they predict different <SUB> p T </SUB> dependences of the J / ψ polarization. In this analysis, J / ψ polarization is studied in the helicity frame. The polarization parameter <SUB> λ θ </SUB> measured at RHIC becomes smaller towards high <SUB> p T </SUB> , indicating more longitudinal J / ψ polarization as <SUB> p T </SUB> increases. The result is compared with predictions of presently available models.</P>
Adamczyk, L.,Adkins, J. K.,Agakishiev, G.,Aggarwal, M. M.,Ahammed, Z.,Ajitanand, N. N.,Alekseev, I.,Anderson, D. M.,Aoyama, R.,Aparin, A.,Arkhipkin, D.,Aschenauer, E. C.,Ashraf, M. U.,Attri, A.,Averic American Physical Society 2017 Physical review. C Vol.96 No.5
<P>The rho(0) differential cross section d sigma/dt exhibits a clear diffraction pattern, compatible with scattering from a gold nucleus, with two minima visible. The positions of the diffractive minima agree better with the predictions of a quantum Glauber calculation that does not include nuclear shadowing than with a calculation that does include shadowing.</P>
Adamczyk, L.,Adkins, J. K.,Agakishiev, G.,Aggarwal, M. M.,Ahammed, Z.,Ajitanand, N. N.,Alekseev, I.,Anderson, D. M.,Aoyama, R.,Aparin, A.,Arkhipkin, D.,Aschenauer, E. C.,Ashraf, M. U.,Attri, A.,Averic American Physical Society 2017 Physical Review D Vol.95 No.7
<P>We report the first measurement of the longitudinal double-spin asymmetry A(LL) for midrapidity dijet production in polarized pp collisions at a center-of-mass energy of root s = 200 GeV. The dijet cross section was measured and is shown to be consistent with next-to-leading order (NLO) perturbative QCD predictions. A(LL) results are presented for two distinct topologies, defined by the jet pseudorapidities, and are compared to predictions from several recent NLO global analyses. The measured asymmetries, the first such correlation measurements, support those analyses that find positive gluon polarization at the level of roughly 0.2 over the region of Bjorken-x > 0.05.</P>
Azimuthal Anisotropy inU+UandAu+AuCollisions at RHIC
Adamczyk, L.,Adkins, J. K.,Agakishiev, G.,Aggarwal, M. M.,Ahammed, Z.,Alekseev, I.,Alford, J.,Aparin, A.,Arkhipkin, D.,Aschenauer, E. C.,Averichev, G. S.,Banerjee, A.,Bellwied, R.,Bhasin, A.,Bhati, A. American Physical Society 2015 Physical review letters Vol.115 No.22
Energy dependence ofKπ,pπ, andKpfluctuations in Au + Au collisions from<sub>sNN</sub>=7.7to 200 GeV
Adamczyk, L.,Adkins, J. K.,Agakishiev, G.,Aggarwal, M. M.,Ahammed, Z.,Alekseev, I.,Alford, J.,Aparin, A.,Arkhipkin, D.,Aschenauer, E. C.,Averichev, G. S.,Banerjee, A.,Bellwied, R.,Bhasin, A.,Bhati, A. American Physical Society 2015 PHYSICAL REVIEW C - Vol.92 No.2