Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/xmlui/handle/100/16131
Title: Anomalous centrality evolution of two-particle angular correlations from Au-Au collisions at root s(NN)=62 and 200 GeV
Authors: AGAKISHIEV, G
AGGARWAL, MM
AHAMMED, Z
ALAKHVERDYANTS, AV
ALEKSEEV, I
ALFORD, J
ANDERSON, BD
ANSON, CD
ARKHIPKIN, D
AVERICHEV, GS
BALEWSKI, J
BEAVIS, DR
BEHERA, NK
BELLWIED, R
BETANCOURT, MJ
BETTS, RR
BHASIN, A
BHATI, AK
BICHSEL, H
BIELCIK, J
BIELCIKOVA, J
BLAND, LC
BORDYUZHIN, IG
BOROWSKI, W
BOUCHET, J
BRAIDOT, E
BRANDIN, AV
BROVKO, SG
BRUNA, E
BUELTMANN, S
BUNZAROV, I
BURTON, TP
CAI, XZ
CAINES, H
SANCHEZ, MCD
CEBRA, D
CENDEJAS, R
CERVANTES, MC
CHALOUPKA, P
CHATTOPADHYAY, S
CHEN, HF
CHEN, JH
CHEN, JY
CHEN, L
CHENG, J
CHERNEY, M
CHIKANIAN, A
CHRISTIE, W
CHUNG, P
CODRINGTON, MJM
CORLISS, R
CRAMER, JG
CRAWFORD, HJ
CUI, X
DAUGHERITY, MS
LEYVA, AD
DE SILVA, LC
DEBBE, RR
DEDOVICH, TG
DENG, J
DEREVSCHIKOV, AA
DE SOUZA, RD
DIDENKO, L
DJAWOTHO, P
DONG, X
DRACHENBERG, JL
DRAPER, JE
DU, CM
DUNLOP, JC
EFIMOV, LG
ELNIMR, M
ENGELAGE, J
EPPLEY, G
ESTIENNE, M
EUN, L
EVDOKIMOV, O
FATEMI, R
FEDORISIN, J
FERSCH, RG
FILIP, P
FINCH, E
FINE, V
FISYAK, Y
GAGLIARDI, CA
GANGADHARAN, DR
GEURTS, F
GHOSH, P
GORBUNOV, YN
GORDON, A
GREBENYUK, OG
GROSNICK, D
GUPTA, A
GUPTA, S
HAAG, B
HAJKOVA, O
HAMED, A
HAN, LX
HAYS-WEHLE, JP
HEPPELMANN, S
HIRSCH, A
HOFFMANN, GW
HOFMAN, DJ
HUANG, B
HUANG, HZ
HUMANIC, TJ
HUO, L
IGO, G
JACOBS, WW
JENA, C
JOSEPH, J
JUDD, EG
KABANA, S
KANG, K
KAPITAN, J
KAUDER, K
KE, HW
KEANE, D
KECHECHYAN, A
KETTLER, D
KIKOLA, DP
KIRYLUK, J
KISIEL, A
KIZKA, V
KLEIN, SR
KOETKE, DD
KOLLEGGER, T
KONZER, J
KORALT, I
KOROLEVA, L
KORSCH, W
KOTCHENDA, L
KRAVTSOV, P
KRUEGER, K
KUMAR, L
LAMONT, MAC
LANDGRAF, JM
LAPOINTE, S
LAURET, J
LEBEDEV, A
LEDNICKY, R
LEE, JH
LEIGHT, W
LEVINE, MJ
LI, C
LI, L
LI, W
LI, X
LI, X
LI, Y
LI, ZM
LIMA, LM
LISA, MA
LIU, F
LJUBICIC, T
LLOPE, WJ
LONGACRE, RS
LU, Y
LUKASHOV, EV
LUO, X
MA, GL
MA, YG
MAHAPATRA, DP
MAJKA, R
MALL, OI
MANWEILER, R
MARGETIS, S
MARKERT, C
MASUI, H
MATIS, HS
MCDONALD, D
MCSHANE, TS
MESCHANIN, A
MILNER, R
MINAEV, NG
MIODUSZEWSKI, S
MITROVSKI, MK
MOHAMMED, Y
MOHANTY, B
MONDAL, MM
MOROZOV, B
MOROZOV, DA
MUNHOZ, MG
MUSTAFA, MK
NAGLIS, M
NANDI, BK
NAYAK, TK
NOGACH, LV
NURUSHEV, SB
ODYNIEC, G
OGAWA, A
OH, K
OHLSON, A
OKOROKOV, V
OLDAG, EW
OLIVEIRA, RAN
OLSON, D
PACHR, M
PAGE, BS
PAL, SK
PANDIT, Y
PANEBRATSEV, Y
PAWLAK, T
PEI, H
PEITZMANN, T
PERKINS, C
PERYT, W
PILE, P
PLANINIC, M
PLUTA, J
PLYKU, D
POLJAK, N
PORTER, J
POWELL, CB
PRINDLE, D
PRUNEAU, C
PRUTHI, NK
PUJAHARI, PR
PUTSCHKE, J
QIU, H
RANIWALA, R
RANIWALA, S
RAY, RL
REDWINE, R
REED, R
RITTER, HG
ROBERTS, JB
ROGACHEVSKIY, OV
ROMERO, JL
RUAN, L
RUSNAK, J
SAHOO, NR
SAKREJDA, I
SALUR, S
SANDWEISS, J
SANGALINE, E
SARKAR, A
SCHAMBACH, J
SCHARENBERG, RP
SCHAUB, J
SCHMAH, AM
SCHMITZ, N
SCHUSTER, TR
SEELE, J
SEGER, J
SELYUZHENKOV, I
SEYBOTH, P
SHAH, N
SHAHALIEV, E
SHAO, M
SHARMA, M
SHI, SS
SHOU, QY
SICHTERMANN, EP
SIMON, F
SINGARAJU, RN
SKOBY, MJ
SMIRNOV, N
SOLANKI, D
SORENSEN, P
DESOUZA, UG
SPINKA, HM
SRIVASTAVA, B
STANISLAUS, TDS
STEADMAN, SG
STEVENS, JR
STOCK, R
STRIKHANOV, M
STRINGFELLOW, B
SUAIDE, AAP
SUAREZ, MC
SUMBERA, M
SUN, XM
SUN, Y
SUN, Z
SURROW, B
SVIRIDA, DN
SYMONS, TJM
DE TOLEDO, AS
TAKAHASHI, J
TANG, AH
TANG, Z
TARINI, LH
TARNOWSKY, T
THEIN, D
THOMAS, JH
TIAN, J
TIMMINS, AR
TLUSTY, D
TOKAREV, M
TRAINOR, TA
TRENTALANGE, S
TRIBBLE, RE
TRIBEDY, P
TRZECIAK, BA
TSAI, OD
ULLRICH, T
UNDERWOOD, DG
VAN BUREN, G
VAN NIEUWENHUIZEN, G
VANFOSSEN, JA
VARMA, R
VASCONCELOS, GMS
VASILIEV, AN
VIDEBAEK, F
VIYOGI, YP
VOKAL, S
WADA, M
WALKER, M
WANG, F
WANG, G
WANG, H
WANG, JS
WANG, Q
WANG, XL
WANG, Y
WEBB, G
WEBB, JC
WESTFALL, GD
WHITTEN, C
WIEMAN, H
WISSINK, SW
WITT, R
WITZKE, W
WU, YF
XIAO, Z
XIE, W
XU, H
XU, N
XU, QH
XU, W
XU, Y
XU, Z
XUE, L
YANG, Y
YANG, Y
YEPES, P
YIP, K
YOO, IK
ZAWISZA, M
ZBROSZCZYK, H
ZHAN, W
ZHANG, JB
ZHANG, S
ZHANG, WM
ZHANG, XP
ZHANG, Y
ZHANG, ZP
ZHAO, F
ZHAO, J
ZHONG, C
ZHU, X
ZHU, YH
ZOULKARNEEVA, Y
Issue Date: 2012
Publisher: AMER PHYSICAL SOC
Citation: PHYSICAL REVIEW C, 86(6)
Abstract: We present two-dimensional (2D) two-particle angular correlations measured with the STAR detector on relative pseudorapidity eta and azimuth phi for charged particles from Au-Au collisions at root s(NN) = 62 and 200 GeV with transverse momentum p(t) >= 0.15 GeV/c, vertical bar eta vertical bar <= 1, and 2 pi in azimuth. Observed correlations include a same-side (relative azimuth <pi/2) 2D peak, a closely related away-side azimuth dipole, and an azimuth quadrupole conventionally associated with elliptic flow. The same-side 2D peak and away-side dipole are explained by semihard parton scattering and fragmentation (minijets) in proton-proton and peripheral nucleus-nucleus collisions. Those structures follow N-N binary-collision scaling in Au-Au collisions until midcentrality, where a transition to a qualitatively different centrality trend occurs within one 10% centrality bin. Above the transition point the number of same-side and away-side correlated pairs increases rapidly relative to binary-collision scaling, the eta width of the same-side 2D peak also increases rapidly (eta elongation), and the phi width actually decreases significantly. Those centrality trends are in marked contrast with conventional expectations for jet quenching in a dense medium. The observed centrality trends are compared to perturbative QCD predictions computed in HIJING, which serve as a theoretical baseline, and to the expected trends for semihard parton scattering and fragmentation in a thermalized opaque medium predicted by theoretical calculations and phenomenological models. We are unable to reconcile a semihard parton scattering and fragmentation origin for the observed correlation structure and centrality trends with heavy-ion collision scenarios that invoke rapid parton thermalization. If the collision system turns out to be effectively opaque to few-GeV partons the present observations would be inconsistent with the minijet picture discussed here. DOI: 10.1103/PhysRevC.86.064902
URI: http://dx.doi.org/10.1103/PhysRevC.86.064902
http://dspace.library.iitb.ac.in/jspui/handle/100/16131
ISSN: 0556-2813
1089-490X
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