Azimuthal transverse single-spin asymmetries of inclusive jets and charged pions within jets from polarized-proton collisions at root s=500 GeV

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F18%3A00488717" target="_blank" >RIV/61389005:_____/18:00488717 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68407700:21340/18:00319489

Výsledek na webu

<a href="http://dx.doi.org/10.1103/PhysRevD.97.032004" target="_blank" >http://dx.doi.org/10.1103/PhysRevD.97.032004</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevD.97.032004" target="_blank" >10.1103/PhysRevD.97.032004</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Azimuthal transverse single-spin asymmetries of inclusive jets and charged pions within jets from polarized-proton collisions at root s=500 GeV

Popis výsledku v původním jazyce

We report the first measurements of transverse single-spin asymmetries for inclusive jet and jet + pi(+/-) production at midrapidity from transversely polarized proton-proton collisions at root s = 500 GeV. The data were collected in 2011 with the STAR detector sampled from 23 pb(-1) integrated luminosity with an average beam polarization of 53%. Asymmetries are reported for jets with transverse momenta 6 < p(T) < 55 GeV/c and pseudorapidity vertical bar eta vertical bar < 1. Presented are measurements of the inclusive-jet azimuthal transverse single-spin asymmetry, sensitive to twist-3 initial-state quark-gluon correlators. The Collins asymmetry, sensitive to quark transversity coupled to the polarized Collins fragmentation function. The first measurement of the 'Collins-like' asymmetry, sensitive to linearly polarized gluons. Within the present statistical precision, inclusive-jet and Collins-like asymmetries are small, with the latter allowing the first experimental constraints on gluon linear polarization in a polarized proton. At higher values of jet transverse momenta, we observe the first nonzero Collins asymmetries in polarized-proton collisions, with a statistical significance of greater than 5 sigma. The results span a range of x similar to results from semi-inclusive deep-inelastic scattering but at much higher Q(2). The Collins results enable tests of universality and factorization breaking in the transverse momentum-dependent formulation of perturbative quantum chromodynamics.

Název v anglickém jazyce

Azimuthal transverse single-spin asymmetries of inclusive jets and charged pions within jets from polarized-proton collisions at root s=500 GeV

Popis výsledku anglicky

We report the first measurements of transverse single-spin asymmetries for inclusive jet and jet + pi(+/-) production at midrapidity from transversely polarized proton-proton collisions at root s = 500 GeV. The data were collected in 2011 with the STAR detector sampled from 23 pb(-1) integrated luminosity with an average beam polarization of 53%. Asymmetries are reported for jets with transverse momenta 6 < p(T) < 55 GeV/c and pseudorapidity vertical bar eta vertical bar < 1. Presented are measurements of the inclusive-jet azimuthal transverse single-spin asymmetry, sensitive to twist-3 initial-state quark-gluon correlators. The Collins asymmetry, sensitive to quark transversity coupled to the polarized Collins fragmentation function. The first measurement of the 'Collins-like' asymmetry, sensitive to linearly polarized gluons. Within the present statistical precision, inclusive-jet and Collins-like asymmetries are small, with the latter allowing the first experimental constraints on gluon linear polarization in a polarized proton. At higher values of jet transverse momenta, we observe the first nonzero Collins asymmetries in polarized-proton collisions, with a statistical significance of greater than 5 sigma. The results span a range of x similar to results from semi-inclusive deep-inelastic scattering but at much higher Q(2). The Collins results enable tests of universality and factorization breaking in the transverse momentum-dependent formulation of perturbative quantum chromodynamics.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10304 - Nuclear physics

Projekt

<a href="/cs/project/EF16_013%2F0001569" target="_blank" >EF16_013/0001569: Brookhavenská národní laboratoř - účast České republiky</a><br>

Návaznosti

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

—

Svazek periodika

97

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

7

Strana od-do

—

Kód UT WoS článku

000424057200002

EID výsledku v databázi Scopus

2-s2.0-85043399656