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Nonperturbative-transverse-momentum broadening in dihadron angular correlations in sNN =200 GeV proton-nucleus collisions

  • Author(s): Aidala, C;
  • Akiba, Y;
  • Alfred, M;
  • Andrieux, V;
  • Apadula, N;
  • Asano, H;
  • Azmoun, B;
  • Babintsev, V;
  • Bandara, NS;
  • Barish, KN;
  • Bathe, S;
  • Bazilevsky, A;
  • Beaumier, M;
  • Belmont, R;
  • Berdnikov, A;
  • Berdnikov, Y;
  • Blau, DS;
  • Boer, M;
  • Bok, JS;
  • Brooks, ML;
  • Bryslawskyj, J;
  • Bumazhnov, V;
  • Campbell, S;
  • Canoa Roman, V;
  • Cervantes, R;
  • Chi, CY;
  • Chiu, M;
  • Choi, IJ;
  • Choi, JB;
  • Citron, Z;
  • Connors, M;
  • Cronin, N;
  • Csanád, M;
  • Csörgo, T;
  • Danley, TW;
  • Daugherity, MS;
  • David, G;
  • Deblasio, K;
  • Dehmelt, K;
  • Denisov, A;
  • Deshpande, A;
  • Desmond, EJ;
  • Dion, A;
  • Dixit, D;
  • Do, JH;
  • Drees, A;
  • Drees, KA;
  • Durham, JM;
  • Durum, A;
  • Enokizono, A;
  • En'Yo, H;
  • Esumi, S;
  • Fadem, B;
  • Fan, W;
  • Feege, N;
  • Fields, DE;
  • Finger, M;
  • Finger, M;
  • Fokin, SL;
  • Frantz, JE;
  • Franz, A;
  • Frawley, AD;
  • Fukuda, Y;
  • Gal, C;
  • Gallus, P;
  • Garg, P;
  • Ge, H;
  • Giordano, F;
  • Goto, Y;
  • Grau, N;
  • Greene, SV;
  • Grosse Perdekamp, M;
  • Gunji, T;
  • Guragain, H;
  • Hachiya, T;
  • Haggerty, JS;
  • Hahn, KI;
  • Hamagaki, H;
  • Hamilton, HF;
  • Han, SY;
  • Hanks, J;
  • Hasegawa, S;
  • Haseler, TOS;
  • He, X;
  • Hemmick, TK;
  • Hill, JC;
  • Hill, K;
  • Hodges, A;
  • Hollis, RS;
  • Homma, K;
  • Hong, B;
  • Hoshino, T;
  • Hotvedt, N;
  • Huang, J;
  • Huang, S;
  • Imai, K;
  • Inaba, M;
  • Iordanova, A;
  • Isenhower, D;
  • Ivanishchev, D
  • et al.
Abstract

The PHENIX collaboration has measured high-pT dihadron correlations in p+p, p+Al, and p+Au collisions at sNN=200 GeV. The correlations arise from inter- and intrajet correlations and thus have sensitivity to nonperturbative effects in both the initial and final states. The distributions of pout, the transverse-momentum component of the associated hadron perpendicular to the trigger hadron, are sensitive to initial- and final-state transverse momenta. These distributions are measured multidifferentially as a function of xE, the longitudinal momentum fraction of the associated hadron with respect to the trigger hadron. The near-side pout widths, sensitive to fragmentation transverse momentum, show no significant broadening between p+Au, p+Al, and p+p. The away-side nonperturbative pout widths are found to be broadened in p+Au when compared to p+p; however, there is no significant broadening in p+Al compared to p+p collisions. The data also suggest that the away-side pout broadening is a function of Ncoll, the number of binary nucleon-nucleon collisions, in the interaction. The potential implications of these results with regard to initial- and final-state transverse-momentum broadening and energy loss of partons in a nucleus, among other nuclear effects, are discussed.

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