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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>
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.,Alford, J.,Aparin, A.,Arkhipkin, D.,Aschenauer, E. C.,Averichev, G. S.,Banerjee, A.,Bellwied, R.,Bhasin, A.,Bhati, A. American Physical Society 2016 Physical Review C Vol.94 No.2
<P>Balance functions have been measured in terms of relative pseudorapidity (Delta(eta)) for charged particle pairs at the BNL Relativistic Heavy Ion Collider from Au + Au collisions at root s(NN) = 7.7 GeV to 200 GeV using the STAR detector. These results are compared with balance functions measured at the CERN Large Hadron Collider from Pb + Pb collisions at root s(NN) = 2.76 TeV by the ALICE Collaboration. The width of the balance function decreases as the collisions become more central and as the beam energy is increased. In contrast, the widths of the balance functions calculated using shuffled events show little dependence on centrality or beam energy and are larger than the observed widths. Balance function widths calculated using events generated by UrQMD are wider than the measured widths in central collisions and show little centrality dependence. The measured widths of the balance functions in central collisions are consistent with the delayed hadronization of a deconfined quark gluon plasma (QGP). The narrowing of the balance function in central collisions at root s(NN) = 7.7 GeV implies that a QGP is still being created at this relatively low energy.</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
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.K.,B Elsevier 2015 Physics letters: B Vol.743 No.-
<P><B>Abstract</B></P> <P>Dihadron correlations are analyzed in <SUB> s NN </SUB> = 200 GeV d + Au collisions classified by forward charged particle multiplicity and zero-degree neutral energy in the Au-beam direction. It is found that the jetlike correlated yield increases with the event multiplicity. After taking into account this dependence, the non-jet contribution on the away side is minimal, leaving little room for a back-to-back ridge in these collisions.</P>
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