Measurement of transverse single-spin asymmetries of pi(0) and electromagnetic jets at forward rapidity in 200 and 500 GeV transversely polarized proton-proton collisions
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F21%3A00543904" target="_blank" >RIV/61389005:_____/21:00543904 - isvavai.cz</a>
Alternative codes found
RIV/68407700:21340/21:00351231
Result on the web
<a href="https://doi.org/10.1103/PhysRevD.103.092009" target="_blank" >https://doi.org/10.1103/PhysRevD.103.092009</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevD.103.092009" target="_blank" >10.1103/PhysRevD.103.092009</a>
Alternative languages
Result language
angličtina
Original language name
Measurement of transverse single-spin asymmetries of pi(0) and electromagnetic jets at forward rapidity in 200 and 500 GeV transversely polarized proton-proton collisions
Original language description
The STAR Collaboration reports measurements of the transverse single-spin asymmetry (TSSA) of inclusive pi(0) at center-of-mass energies (root s) of 200 GeV and 500 GeV in transversely polarized proton-proton collisions in the pseudo-rapidity region 2.7 to 4.0. The results at the two different energies show a continuous increase of the TSSA with Feynman-x, and, when compared to previous measurements, no dependence on root s from 19.4 GeV to 500 GeV is found. To investigate the underlying physics leading to this large TSSA, different topologies have been studied. pi(0) with no nearby particles tend to have a higher TSSA than inclusive pi(0). The TSSA for inclusive electromagnetic jets, sensitive to the Sivers effect in the initial state, is substantially smaller, but shows the same behavior as the inclusive pi(0) asymmetry as a function of Feynman-x. To investigate final-state effects, the Collins asymmetry of pi(0) inside electromagnetic jets has been measured. The Collins asymmetry is analyzed for its dependence on the pi(0) momentum transverse to the jet thrust axis and its dependence on the fraction of jet energy carried by the pi(0). The asymmetry was found to be small in each case for both center-of-mass energies. All the measurements are compared to QCD-based theoretical calculations for transverse-momentum-dependent parton distribution functions and fragmentation functions. Some discrepancies are found, which indicates new mechanisms might be involved.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10303 - Particles and field physics
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Physical Review D
ISSN
2470-0010
e-ISSN
2470-0029
Volume of the periodical
103
Issue of the periodical within the volume
9
Country of publishing house
US - UNITED STATES
Number of pages
14
Pages from-to
092009
UT code for WoS article
000655872600001
EID of the result in the Scopus database
2-s2.0-85107301897