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oai:tsukuba.repo.nii.ac.jp:00052326
2022-07-18T23:52:10Z
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Nonperturbative transverse-momentum-dependent effects in dihadron and direct photon-hadron angular correlations in p+p collisions at √s=200??GeV
江角, 晋一
エスミ, シンイチ
ESUMI, ShinIchi
新井田, 貴文
ニイダ, タカフミ
NIIDA, Takafumi
小沢, 恭一郎
オザワ, キョウイチロウ
OZAWA, Kyoichiro
PHENI Collaboration
open access
Published by the American Physical Society under the terms oftheCreative Commons Attribution 4.0 Internationallicense.Further distribution of this work must maintain attribution tothe author(s) and the published article’s title, journal citation,and DOI. Funded by SCOAP3.
Dihadron and isolated direct photon-hadron angular correlations are measured in p+p collisions at √s=200??GeV. The correlations are sensitive to nonperturbative initial-state and final-state transverse momenta kT and jT in the azimuthal nearly back-to-back region Δ??π. To have sensitivity to small transverse momentum scales, nonperturbative momentum widths of pout, the out-of-plane transverse-momentum component perpendicular to the trigger particle, are measured. In this region, the evolution of pout can be studied when several different hard scales are measured. These widths are used to investigate possible effects from transverse-momentum-dependent factorization breaking. When accounting for the longitudinal-momentum fraction of the away-side hadron with respect to the near-side trigger particle, the widths are found to increase with the hard scale; this is qualitatively similar to the observed behavior in Drell-Yan and semi-inclusive deep-inelastic scattering interactions, where factorization is predicted to hold. The momentum widths are also studied as a function of center-of-mass energy by comparing to previous measurements at √s=510??GeV. The nonperturbative jet widths also appear to increase with √s at a similar xT, which is qualitatively consistent to similar measurements in Drell-Yan interactions. Future detailed global comparisons between measurements of processes where transverse-momentum-dependent factorization is predicted to hold and be broken will provide further insight into the role of color in hadronic interactions.
American Physical Society
2018-10
eng
journal article
VoR
http://hdl.handle.net/2241/00157749
https://tsukuba.repo.nii.ac.jp/records/52326
https://doi.org/10.1103/PhysRevD.98.072004
2470-0010
AA00773624
Physical review D
98
7
072004
https://tsukuba.repo.nii.ac.jp/record/52326/files/PRD_98-7-072004.pdf
application/pdf
1.0 MB
2019-09-27