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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>
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