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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

© 2019 authors. Published by the American Physical Society. Funded by SCOAP 3 . 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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