Nonperturbative transverse-momentum-dependent effects in dihadron and direct photon-hadron angular correlations in p+p collisions at root s=200 GeV

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F18%3A00324229" target="_blank" >RIV/68407700:21340/18:00324229 - isvavai.cz</a>

Výsledek na webu

<a href="https://arxiv.org/abs/1805.02450" target="_blank" >https://arxiv.org/abs/1805.02450</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevD.98.072004" target="_blank" >10.1103/PhysRevD.98.072004</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Nonperturbative transverse-momentum-dependent effects in dihadron and direct photon-hadron angular correlations in p+p collisions at root s=200 GeV

Popis výsledku v původním jazyce

Dihadron and isolated direct photon-hadron angular correlations are measured in p+p collisions at root s=200 GeV. The correlations are sensitive to nonperturbative initial-state and final-state transverse momentum kT and jT in the azimuthal nearly back-to-back region Δϕ~π. In this region, transverse-momentum-dependent evolution can be studied when several different hard scales are measured. To have sensitivity to small transverse momentum scales, nonperturbative momentum widths of p_out, the out-of-plane transverse momentum component perpendicular to the trigger particle, 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. The momentum widths are also studied as a function of center-of-mass energy by comparing to previous measurements at root s=510 GeV. The nonperturbative jet widths also appear to increase with root s at a similar x_T, which is qualitatively consistent to similar measurements in Drell-Yan interactions. To quantify the magnitude of any transverse-momentum-dependent factorization breaking effects, calculations will need to be performed to compare to these measurements.

Název v anglickém jazyce

Nonperturbative transverse-momentum-dependent effects in dihadron and direct photon-hadron angular correlations in p+p collisions at root s=200 GeV

Popis výsledku anglicky

Dihadron and isolated direct photon-hadron angular correlations are measured in p+p collisions at root s=200 GeV. The correlations are sensitive to nonperturbative initial-state and final-state transverse momentum kT and jT in the azimuthal nearly back-to-back region Δϕ~π. In this region, transverse-momentum-dependent evolution can be studied when several different hard scales are measured. To have sensitivity to small transverse momentum scales, nonperturbative momentum widths of p_out, the out-of-plane transverse momentum component perpendicular to the trigger particle, 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. The momentum widths are also studied as a function of center-of-mass energy by comparing to previous measurements at root s=510 GeV. The nonperturbative jet widths also appear to increase with root s at a similar x_T, which is qualitatively consistent to similar measurements in Drell-Yan interactions. To quantify the magnitude of any transverse-momentum-dependent factorization breaking effects, calculations will need to be performed to compare to these measurements.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10303 - Particles and field physics

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Physical Review D

ISSN

2470-0010

e-ISSN

2470-0029

Svazek periodika

98

Číslo periodika v rámci svazku

7

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

13

Strana od-do

—

Kód UT WoS článku

000447485900001

EID výsledku v databázi Scopus

2-s2.0-85056187474