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Longitudinal spin transfer toΛandΛ¯hyperons in polarized proton-proton collisions ats=200 GeV
Abelev, B. I.,Aggarwal, M. M.,Ahammed, Z.,Alakhverdyants, A. V.,Anderson, B. D.,Arkhipkin, D.,Averichev, G. S.,Balewski, J.,Barannikova, O.,Barnby, L. S.,Baumgart, S.,Beavis, D. R.,Bellwied, R.,Benedo American Physical Society 2009 PHYSICAL REVIEW D - Vol.80 No.11
System size dependence of associated yields in hadron-triggered jets
STAR Collaboration,Abelev, B.I.,Aggarwal, M.M.,Ahammed, Z.,Anderson, B.D.,Arkhipkin, D.,Averichev, G.S.,Balewski, J.,Barannikova, O.,Barnby, L.S.,Baudot, J.,Baumgart, S.,Beavis, D.R.,Bellwied, R.,Bene North-Holland Pub. Co 2010 Physics letters: B Vol.683 No.2
We present results on the system size dependence of high transverse momentum di-hadron correlations at s<SUB>NN</SUB>=200 GeV as measured by STAR at RHIC. Measurements in d+Au, Cu+Cu and Au+Au collisions reveal similar jet-like near-side correlation yields (correlations at small angular separation -Δφ∼0, Δη∼0) for all systems and centralities. Previous measurements have shown that the away-side (Δφ∼π) yield is suppressed in heavy-ion collisions. We present measurements of the away-side suppression as a function of transverse momentum and centrality in Cu+Cu and Au+Au collisions. The suppression is found to be similar in Cu+Cu and Au+Au collisions at a similar number of participants. The results are compared to theoretical calculations based on the parton quenching model and the modified fragmentation model. The observed differences between data and theory indicate that the correlated yields presented here will further constrain dynamic energy loss models and provide information about the dynamic density profile in heavy-ion collisions.
Forward Neutral Pion Production inp+pandd+AuCollisions atsNN=200 GeV
Adams, J.,Aggarwal, M. M.,Ahammed, Z.,Amonett, J.,Anderson, B. D.,Arkhipkin, D.,Averichev, G. S.,Badyal, S. K.,Bai, Y.,Balewski, J.,Barannikova, O.,Barnby, L. S.,Baudot, J.,Bekele, S.,Belaga, V. V.,Be American Physical Society 2006 Physical review letters Vol.97 No.15
Observation of an Antimatter Hypernucleus
Abelev, B. I.,Aggarwal, M. M.,Ahammed, Z.,Alakhverdyants, A. V.,Alekseev, I.,Anderson, B. D.,Arkhipkin, D.,Averichev, G. S.,Balewski, J.,Barnby, L. S.,Baumgart, S.,Beavis, D. R.,Bellwied, R.,Betancour American Association for the Advancement of Scienc 2010 Science Vol.328 No.5974
Adams, J,Aggarwal, M M,Ahammed, Z,Amonett, J,Anderson, B D,Anderson, M,Arkhipkin, D,Averichev, G S,Bai, Y,Balewski, J,Barannikova, O,Barnby, L S,Baudot, J,Bekele, S,Belaga, V V,Bellingeri-Laurikainen, Institute of Physics Publishing 2007 Journal of Physics. G, Nuclear and Particle Physic Vol.34 No.3
<P>We present the first study of the energy dependence of <I>p<SUB>t</SUB></I> angular correlations inferred from event-wise mean transverse momentum 〈<I>p<SUB>t</SUB></I>〉 fluctuations in heavy ion collisions. We compare our large-acceptance measurements at CM energies <img SRC='http://ej.iop.org/images/0954-3899/34/3/004/jpg233147ieqn1.gif' ALIGN='MIDDLE' ALT='\sqrt{s_{\rm NN}} = 19.6'/>, 62.4, 130 and 200 GeV to SPS measurements at 12.3 and 17.3 GeV. <I>p<SUB>t</SUB></I> angular correlation structure suggests that the principal source of <I>p<SUB>t</SUB></I> correlations and fluctuations is minijets (minimum-bias parton fragments). We observe a dramatic increase in correlations and fluctuations from SPS to RHIC energies, increasing linearly with <img SRC='http://ej.iop.org/images/0954-3899/34/3/004/jpg233147ieqn2.gif' ALIGN='MIDDLE' ALT='\ln \sqrt{s_{\rm NN}} '/> from the onset of observable jet-related 〈<I>p<SUB>t</SUB></I>〉 fluctuations near 10 GeV.</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>
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>