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Report No.

Nonperturbative-transverse-momentum broadening in dihadron angular correlations in $$sqrt{s_{NN}}=200$$ GeV proton-nucleus collisions

Aidala, C.*; Hasegawa, Shoichi  ; Imai, Kenichi; Sako, Hiroyuki  ; Sato, Susumu ; Tanida, Kiyoshi  ; PHENIX Collaboration*; 293 of others*

The PHENIX collaboration has measured high-$$p_T$$ dihadron correlations in $$p$$$$+$$$$p$$, $$p$$$$+$$Al, and $$p$$$$+$$Au collisions at $$sqrt{s_{_{NN}}}=200$$ GeV. The correlations arise from inter- and intra-jet correlations and thus have sensitivity to nonperturbative effects in both the initial and final states. The distributions of $$p_{rm out}$$, 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 multi-differentially as a function of $$x_E$$, the longitudinal momentum fraction of the associated hadron with respect to the trigger hadron. The near-side $$p_{rm out}$$ widths, sensitive to fragmentation transverse momentum, show no significant broadening between $$p$$$$+$$Au, $$p$$$$+$$Al, and $$p$$$$+$$$$p$$. The away-side nonperturbative $$p_{rm out}$$ 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 $$p_{rm out}$$ broadening is a function of $$N_{rm coll}$$, 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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Category:Physics, Nuclear



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