Energy dependence of pi(+/-), p and (p)over-bar transverse momentum spectra for Au+Au collisions at root SNN=62.4 and 200 GeV

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Energy dependence of pi(+/-), p and (p)over-bar transverse momentum spectra for Au+Au collisions at root SNN=62.4 and 200 GeV

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Title: Energy dependence of pi(+/-), p and (p)over-bar transverse momentum spectra for Au+Au collisions at root SNN=62.4 and 200 GeV
Author: ABELEV, BI; AGGARWAL, MM; AHAMMED, Z; ANDERSON, BD; ARKHIPKIN, D; AVERICHEV, GS; BAI, Y; BALEWSKI, J; BARANNIKOVA, O; BARNBY, LS; BAUMGART, S; BELAGA, VV; BELLINGERI-LAURIKAINEN, A; BELLWIED, R; BENEDOSSO, F; BETTS, RR; BHARADWAJ, S; BHASIN, A; BHATI, AK; BICHSEL, H; BIELCIK, J; BIELCIKOVA, J; BILLMEIER, A; BLAND, LC; BLYTH, SL; BOMBARA, M; BONNER, BE; BOTJE, M; BOUCHET, J; BRANDIN, AV; BRAVAR, A; BURTON, TP; BYSTERSKY, M; CADMAN, RV; CAI, XZ; CAINES, H; SANCHEZ, MCD; CALLNER, J; CATU, O; CEBRA, D; CHAJECKI, Z; CHALOUPKA, P; CHATTOPADHYAY, S; CHEN, HF; CHEN, JH; CHEN, JY; CHENG, J; CHERNEY, M; CHIKANIAN, A; CHOI, HA; CHRISTIE, W; CHUNG, SU; COFFIN, JP; CORMIER, TM; COSENTINO, MR; CRAMER, JG; CRAWFORD, HJ; DAS, D; DASH, S; DAUGHERITY, M; DE MOURA, MM; DEDOVICH, TG; DEPHILLIPS, M; DEREVSCHIKOV, AA; DIDENKO, L; DIETEL, T; DJAWOTHO, P; DOGRA, SM; DONG, X; DRACHENBERG, JL; DRAPER, JE; DU, F; DUNIN, VB; DUNLOP, JC; MAZUMDAR, MRD; ECKARDT, V; EDWARDS, WR; EFIMOV, LG; EMELIANOV, V; ENGELAGE, J; EPPLEY, G; ERAZMUS, B; ESTIENNE, M; FACHINI, P; FATEMI, R; FEDORISIN, J; FENG, A; FILIP, P; FINCH, E; FINE, V; FISYAK, Y; FORNAZIER, KSF; FU, J; GAGLIARDI, CA; GAILLARD, L; GANTI, MS; GARCIA-SOLIS, E; GHAZIKHANIAN, V; GHOSH, P; GORBUNOV, YG; GOS, H; GREBENYUK, O; GROSNICK, D; GUERTIN, SM; GUIMARAES, KSFF; GUPTA, N; HAAG, B; HALLMAN, TJ; HAMED, A; HARRIS, JW; HE, W; HEINZ, M; HENRY, TW; HEPPLEMANN, S; HIPPOLYTE, B; HIRSCH, A; HJORT, E; HOFFMAN, AM; HOFFMANN, GW; HOFMAN, D; HOLLIS, R; HORNER, MJ; HUANG, HZ; HUGHES, EW; HUMANIC, TJ; IGO, G; IORDANOVA, A; JACOBS, P; JACOBS, WW; JAKL, P; JIA, F; JIANG, H; JONES, PG; JUDD, EG; KABANA, S; KANG, K; KAPITAN, J; KAPLAN, M; KEANE, D; KECHECHYAN, A; KETTLER, D; KHODYREV, VY; KIM, BC; KIRYLUK, J; KISIEL, A; KISLOV, EM; KLEIN, SR; KNOSPE, AG; KOCOLOSKI, A; KOETKE, DD; KOLLEGGER, T; KOPYTINE, M; KOTCHENDA, L; KOUCHPIL, V; KOWALIK, KL; KRAMER, M; KRAVTSOV, P; KRAVTSOV, VI; KRUEGER, K; KUHN, C; KULIKOV, AI; KUMAR, A; KURNADI, P; KUZNETSOV, AA; LAMONT, MAC; LANDGRAF, JM; LANGE, S; LAPOINTE, S; LAUE, F; LAURET, J; LEBEDEV, A; LEDNICKY, R; LEE, CH; LEHOCKA, S; LEVINE, MJ; LI, C; LI, Q; LI, Y; LIN, G; LIN, X; LINDENBAUM, SJ; LISA, MA; LIU, F; LIU, H; LIU, J; LIU, L; LJUBICIC, T; LLOPE, WJ; LONG, H; LONGACRE, RS; LOPEZ-NORIEGA, M; LOVE, WA; LU, Y; LUDLAM, T; LYNN, D; MA, GL; MA, JG; MA, YG; MAHAPATRA, DP; MAJKA, R; MANGOTRA, LK; MANWEILER, R; MARGETIS, S; MARKERT, C; MARTIN, L; MATIS, HS; MATULENKO, YA; MCCLAIN, CJ; MCSHANE, TS; MELNICK, Y; MESCHANIN, A; MILLANE, J; MILLER, ML; MINAEV, NG; MIODUSZEWSKI, S; MIRONOV, C; MISCHKE, A; MITCHELL, J; MOHANTY, B; MOLNAR, L; MOROZOV, DA; MUNHOZ, MG; NANDI, BK; NATTRASS, C; NAYAK, TK; NELSON, JM; NEPALI, C; NETRAKANTI, PK; NIKITIN, VA; NOGACH, LV; NURUSHEV, SB; ODYNIEC, G; OGAWA, A; OKOROKOV, V; OLDENBURG, M; OLSON, D; PACHR, M; PAL, SK; PANEBRATSEV, Y; PANITKIN, SY; PAVLINOV, AI; PAWLAK, T; PEITZMANN, T; PEREVOZTCHIKOV, V; PERKINS, C; PERYT, W; PHATAK, SC; PLANINIC, M; PLUTA, J; POLJAK, N; PORILE, N; POSKANZER, AM; POTEKHIN, M; POTREBENIKOVA, E; POTUKUCHI, BVKS; PRINDLE, D; PRUNEAU, C; PUTSCHKE, J; QATTAN, IA; RANIWALA, R; RANIWALA, S; RAY, RL; RAZIN, SV; REINNARTH, J; RELYEA, D; RIDIGER, A; RITTER, HG; ROBERTS, JB; ROGACHEVSKIY, OV; ROMERO, JL; ROSE, A; ROY, C; RUAN, L; RUSSCHER, MJ; SAHOO, R; SAKREJDA, I; SAKUMA, T; SALUR, S; SANDWEISS, J; SARSOUR, M; SAVIN, I; SAZHIN, PS; SCHAMBACH, J; SCHARENBERG, RP; SCHMITZ, N; SEGER, J; SELYUZHENKOV, I; SEYBOTH, P; SHABETAI, A; SHAHALIEV, E; SHAO, M; SHARMA, M; SHEN, WQ; SHIMANSKIY, SS; SICHTERMANN, E; SIMON, F; SINGARAJU, RN; SMIRNOV, N; SNELLINGS, R; SORENSEN, P; SOWINSKI, J; SPELTZ, J; SPINKA, HM; SRIVASTAVA, B; STADNIK, A; STANISLAUS, TDS; STOCK, R; STRIKHANOV, M; STRINGFELLOW, B; SUAIDE, AAP; SUAREZ, MC; SUBBA, NL; SUMBERA, M; SUN, XM; SUN, Z; SURROW, B; SYMONS, TJM; DE TOLEDO, AS; AK, JT; TANG, AH; TARNOWSKY, T; THOMAS, JH; TIMMINS, AR; TIMOSHENKO, S; TOKAREV, M; TRAINOR, TA; TRENTALANGE, S; TRIBBLE, RE; TSAI, OD; ULERY, J; ULLRICH, T; UNDERWOOD, DG; VAN BUREN, G; VAN DER KOLK, N; VAN LEEUWEN, M; MOLEN, AMV; VARMA, R; VASILEVSKI, IM; VASILIEV, AN; VERNET, R; VIGDOR, SE; VIYOGI, YP; VOKAL, S; VOLOSHIN, SA; WAGGONER, WT; WANG, F; WANG, G; WANG, JS; WANG, XL; WANG, Y; WATSON, JW; WEBB, JC; WESTFALL, GD; WETZLER, A; WHITTEN, C; WIEMAN, H; WISSINK, SW; WITT, R; WU, J; WU, J; XU, N; XU, QH; XU, Z; YEPES, P; YOO, IK; YUE, Q; YUREVICH, VI; ZHAN, W; ZHANG, H; ZHANG, WM; ZHANG, Y; ZHANG, ZP; ZHAO, Y; ZHONG, C; ZOULKARNEEV, R; ZOULKARNEEVA, Y; ZUBAREV, AN; ZUO, JX
Abstract: We study the energy dependense of the transverse momentum (PT) spectra for charged pions, protons and anti-protons for An + An collisions at root(NN)-N-s = 62.4 and 200 GeV. Data are presented at mid-rapidity (broken vertical bar y broken vertical bar < 0.5) for 0.2 < PT < 12 GeV/c. In the intermediate PT region (2 < PT < 6 GeV/c), the nuclear modification factor is higher at 62.4 GeV than at 200 GeV, while at higher PT (PT > 7 GeV/c) the modification is similar for both energies. The p/pi(+) and (p) over bar/pi(-) ratios for central collisions at root(NN)-N-s = 62.4 GeV peak at PT similar or equal to 2 GeV/c. In the PT range where recombination is expected to dominate, the p/pi(+) ratios at 62.4 GeV are larger than at 200 GeV, while the (p) over bar/pi(-) ratios are smaller. For PT > 2 GeV/c, the (p) over bar/pi(-) ratios at the two beam energies are independent of P-T and centrality indicating that the dependence of the (p) over bar/pi(-) ratio on P-T does not change between 62.4 and 200 GeV. These findings challenge various models incorporating jet quenching and/or constituent quark coalescence. (C) 2007
URI: http://dx.doi.org/10.1016/j.physletb.2007.06.035
http://dspace.library.iitb.ac.in/xmlui/handle/10054/16573
http://hdl.handle.net/10054/16573
Date: 2007


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