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Dijet imbalance measurements in Au+Au and pp collisions at sqrt[s_{NN}]=200  GeV at STAR.

  • Author(s): Adamczyk, L;
  • Adkins, JK;
  • Agakishiev, G;
  • Aggarwal, MM;
  • Ahammed, Z;
  • Alekseev, I;
  • Anderson, DM;
  • Aoyama, R;
  • Aparin, A;
  • Arkhipkin, D;
  • Aschenauer, EC;
  • Ashraf, MU;
  • Attri, A;
  • Averichev, GS;
  • Bai, X;
  • Bairathi, V;
  • Bellwied, R;
  • Bhasin, A;
  • Bhati, AK;
  • Bhattarai, P;
  • Bielcik, J;
  • Bielcikova, J;
  • Bland, LC;
  • Bordyuzhin, IG;
  • Bouchet, J;
  • Brandenburg, JD;
  • Brandin, AV;
  • Brown, D;
  • Bunzarov, I;
  • Butterworth, J;
  • Caines, H;
  • Calderón de la Barca Sánchez, M;
  • Campbell, JM;
  • Cebra, D;
  • Chakaberia, I;
  • Chaloupka, P;
  • Chang, Z;
  • Chatterjee, A;
  • Chattopadhyay, S;
  • Chen, JH;
  • Chen, X;
  • Cheng, J;
  • Cherney, M;
  • Christie, W;
  • Contin, G;
  • Crawford, HJ;
  • Das, S;
  • De Silva, LC;
  • Debbe, RR;
  • Dedovich, TG;
  • Deng, J;
  • Derevschikov, AA;
  • Didenko, L;
  • Dilks, C;
  • Dong, X;
  • Drachenberg, JL;
  • Draper, JE;
  • Du, CM;
  • Dunkelberger, LE;
  • Dunlop, JC;
  • Efimov, LG;
  • Elsey, N;
  • Engelage, J;
  • Eppley, G;
  • Esha, R;
  • Esumi, S;
  • Evdokimov, O;
  • Ewigleben, J;
  • Eyser, O;
  • Fatemi, R;
  • Fazio, S;
  • Federic, P;
  • Fedorisin, J;
  • Feng, Z;
  • Filip, P;
  • Finch, E;
  • Fisyak, Y;
  • Flores, CE;
  • Fulek, L;
  • Gagliardi, CA;
  • Garand, D;
  • Geurts, F;
  • Gibson, A;
  • Girard, M;
  • Greiner, L;
  • Grosnick, D;
  • Gunarathne, DS;
  • Guo, Y;
  • Gupta, A;
  • Gupta, S;
  • Guryn, W;
  • Hamad, AI;
  • Hamed, A;
  • Haque, R;
  • Harris, JW;
  • He, L;
  • Heppelmann, S;
  • Heppelmann, S;
  • Hirsch, A;
  • Hoffmann, GW;
  • Horvat, S;
  • Huang, X;
  • Huang, B;
  • Huang, HZ;
  • Huang, T;
  • Huck, P;
  • Humanic, TJ;
  • Igo, G;
  • Jacobs, WW;
  • Jentsch, A;
  • Jia, J;
  • Jiang, K;
  • Jowzaee, S;
  • Judd, EG;
  • Kabana, S;
  • Kalinkin, D;
  • Kang, K;
  • Kauder, K;
  • Ke, HW;
  • Keane, D;
  • Kechechyan, A;
  • Khan, Z;
  • Kikoła, DP;
  • Kisel, I;
  • Kisiel, A;
  • Kochenda, L;
  • Koetke, DD;
  • Kosarzewski, LK;
  • Kraishan, AF;
  • Kravtsov, P;
  • Krueger, K;
  • Kumar, L;
  • Lamont, MAC;
  • Landgraf, JM;
  • Landry, KD;
  • Lauret, J;
  • Lebedev, A;
  • Lednicky, R;
  • Lee, JH;
  • Li, W;
  • Li, X;
  • Li, X;
  • Li, Y;
  • Li, C;
  • Lin, T;
  • Lisa, MA;
  • Liu, Y;
  • Liu, F;
  • Ljubicic, T;
  • Llope, WJ;
  • Lomnitz, M;
  • Longacre, RS;
  • Luo, X;
  • Luo, S;
  • Ma, GL;
  • Ma, L;
  • Ma, R;
  • Ma, YG;
  • Magdy, N;
  • Majka, R;
  • Manion, A;
  • Margetis, S;
  • Markert, C;
  • Matis, HS;
  • McDonald, D;
  • McKinzie, S;
  • Meehan, K;
  • Mei, JC;
  • Miller, ZW;
  • Minaev, NG;
  • Mioduszewski, S;
  • Mishra, D;
  • Mohanty, B;
  • Mondal, MM;
  • Morozov, DA;
  • Mustafa, MK;
  • Nasim, Md;
  • Nayak, TK;
  • Nigmatkulov, G;
  • Niida, T;
  • Nogach, LV;
  • Nonaka, T;
  • Novak, J;
  • Nurushev, SB;
  • Odyniec, G;
  • Ogawa, A;
  • Oh, K;
  • Okorokov, VA;
  • Olvitt, D;
  • Page, BS;
  • Pak, R;
  • Pan, YX;
  • Pandit, Y;
  • Panebratsev, Y;
  • Pawlik, B;
  • Pei, H;
  • Perkins, C;
  • Pile, P;
  • Pluta, J;
  • Poniatowska, K;
  • Porter, J;
  • Posik, M;
  • Poskanzer, AM;
  • Pruthi, NK;
  • Przybycien, M;
  • Putschke, J;
  • Qiu, H;
  • Quintero, A;
  • Ramachandran, S;
  • Ray, RL;
  • Reed, R;
  • Rehbein, MJ;
  • Ritter, HG;
  • Roberts, JB;
  • Rogachevskiy, OV;
  • Romero, JL;
  • Roth, JD;
  • Ruan, L;
  • Rusnak, J;
  • Rusnakova, O;
  • Sahoo, NR;
  • Sahu, PK;
  • Sakrejda, I;
  • Salur, S;
  • Sandweiss, J;
  • Schambach, J;
  • Scharenberg, RP;
  • Schmah, AM;
  • Schmidke, WB;
  • Schmitz, N;
  • Seger, J;
  • Seyboth, P;
  • Shah, N;
  • Shahaliev, E;
  • Shanmuganathan, PV;
  • Shao, M;
  • Sharma, MK;
  • Sharma, A;
  • Sharma, B;
  • Shen, WQ;
  • Shi, SS;
  • Shi, Z;
  • Shou, QY;
  • Sichtermann, EP;
  • Sikora, R;
  • Simko, M;
  • Singha, S;
  • Skoby, MJ;
  • Smirnov, D;
  • Smirnov, N;
  • Solyst, W;
  • Song, L;
  • Sorensen, P;
  • Spinka, HM;
  • Srivastava, B;
  • Stanislaus, TDS;
  • Stepanov, M;
  • Stock, R;
  • Strikhanov, M;
  • Stringfellow, B;
  • Sugiura, T;
  • Sumbera, M;
  • Summa, B;
  • Sun, XM;
  • Sun, Z;
  • Sun, Y;
  • Surrow, B;
  • Svirida, DN;
  • Tang, Z;
  • Tang, AH;
  • Tarnowsky, T;
  • Tawfik, A;
  • Thäder, J;
  • Thomas, JH;
  • Timmins, AR;
  • Tlusty, D;
  • Todoroki, T;
  • Tokarev, M;
  • Trentalange, S;
  • Tribble, RE;
  • Tribedy, P;
  • Tripathy, SK;
  • Tsai, OD;
  • Ullrich, T;
  • Underwood, DG;
  • Upsal, I;
  • Van Buren, G;
  • van Nieuwenhuizen, G;
  • Vasiliev, AN;
  • Vertesi, R;
  • Videbæk, F;
  • Vokal, S;
  • Voloshin, SA;
  • Vossen, A;
  • Wang, F;
  • Wang, JS;
  • Wang, G;
  • Wang, Y;
  • Wang, Y;
  • Webb, G;
  • Webb, JC;
  • Wen, L;
  • Westfall, GD;
  • Wieman, H;
  • Wissink, SW;
  • Witt, R;
  • Wu, Y;
  • Xiao, ZG;
  • Xie, G;
  • Xie, W;
  • Xin, K;
  • Xu, QH;
  • Xu, H;
  • Xu, YF;
  • Xu, Z;
  • Xu, J;
  • Xu, N;
  • Yang, S;
  • Yang, Q;
  • Yang, Y;
  • Yang, C;
  • Yang, Y;
  • Yang, Y;
  • Ye, Z;
  • Ye, Z;
  • Yi, L;
  • Yip, K;
  • Yoo, I-K;
  • Yu, N;
  • Zbroszczyk, H;
  • Zha, W;
  • Zhang, XP;
  • Zhang, J;
  • Zhang, J;
  • Zhang, Z;
  • Zhang, S;
  • Zhang, JB;
  • Zhang, Y;
  • Zhang, S;
  • Zhao, J;
  • Zhong, C;
  • Zhou, L;
  • Zhu, X;
  • Zoulkarneeva, Y;
  • Zyzak, M;
  • STAR Collaboration
  • et al.
Abstract

We report the first dijet transverse momentum asymmetry measurements from Au+Au and pp collisions at RHIC. The two highest-energy back-to-back jets reconstructed from fragments with transverse momenta above 2  GeV/c display a significantly higher momentum imbalance in heavy-ion collisions than in the pp reference. When reexamined with correlated soft particles included, we observe that these dijets then exhibit a unique new feature-momentum balance is restored to that observed in pp for a jet resolution parameter of R=0.4, while rebalancing is not attained with a smaller value of R=0.2.

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