Event structure and double helicity asymmetry in jet production from polarized p plus p collisions at root s=200 GeV

dc.contributor.author Adare, Andrew
dc.contributor.author Grau, Nathan
dc.contributor.author Ogilvie, Craig
dc.contributor.author Hill, John
dc.contributor.author Lajoie, John
dc.contributor.author Lebedev, Alexandre
dc.contributor.author Ogilvie, Craig
dc.contributor.author Pei, H.
dc.contributor.author Rosati, Marzia
dc.contributor.author Skutnik, S.
dc.contributor.author Vale, Carla
dc.contributor.author et al.
dc.contributor.department Physics and Astronomy
dc.date 2018-02-18T13:09:41.000
dc.date.accessioned 2020-06-30T06:18:28Z
dc.date.available 2020-06-30T06:18:28Z
dc.date.copyright Sat Jan 01 00:00:00 UTC 2011
dc.date.issued 2011-07-21
dc.description.abstract <p>We report on the event structure and double helicity asymmetry (A(LL)) of jet production in longitudinally polarized p + p collisions at root s = 200 GeV. Photons and charged particles were measured by the PHENIX experiment at midrapidity vertical bar eta vertical bar < 0.35 with the requirement of a high-momentum (> 2 GeV/c) photon in the event. Event structure, such as multiplicity, p(T) density and thrust in the PHENIX acceptance, were measured and compared with the results from the PYTHIA event generator and the GEANT detector simulation. The shape of jets and the underlying event were well reproduced at this collision energy. For the measurement of jet A(LL), photons and charged particles were clustered with a seed-cone algorithm to obtain the cluster pT sum (p(T)(reco)). The effect of detector response and the underlying events on p(T)(reco) was evaluated with the simulation. The production rate of reconstructed jets is satisfactorily reproduced with the next-to-leading-order and perturbative quantum chromodynamics jet production cross section. For 4< p(T)(reco) < 12 GeV/c with an average beam polarization of < P > = 49% we measured Lambda(LL) = -0.0014 +/- 0.0037(stat) at the lowest p(T)(reco) bin (4-5 GeV= c) and -0.0181 +/- 0.0282(stat) at the highest p(T)(reco) bin (10-12 GeV= c) with a beam polarization scale error of 9.4% and a pT scale error of 10%. Jets in the measured p(T)(reco) range arise primarily from hard-scattered gluons with momentum fraction 0: 02 < x < 0: 3 according to PYTHIA. The measured A(LL) is compared with predictions that assume various Delta G(x) distributions based on the Gluck-Reya-Stratmann-Vogelsang parameterization. The present result imposes the limit -a.1 < integral(0.3)(0.02) dx Delta G(x, mu(2) = GeV2) < 0.4 at 95% confidence level or integral(0.3)(0.002) dx Delta G(x, mu(2) = 1 GeV2) < 0.5 at 99% confidence level.</p>
dc.description.comments <p>This article is published as Adare, A., S. Afanasiev, C. Aidala, N. N. Ajitanand, Y. Akiba, H. Al-Bataineh, J. Alexander et al. "Event structure and double helicity asymmetry in jet production from polarized p+ p collisions at s= 200 GeV." <em>Physical Review D</em> 84, no. 1 (2011): 012006. DOI:<a href="http://dx.doi.org/10.1103/PhysRevD.84.012006" target="_blank">10.1103/PhysRevD.84.012006</a>. Posted with permission.</p>
dc.format.mimetype app
dc.identifier archive/lib.dr.iastate.edu/physastro_pubs/290/
dc.identifier.articleid 1298
dc.identifier.contextkey 10246681
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath physastro_pubs/290
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/57045
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/physastro_pubs/290/2011_Ogilvie_Event_Structure.pdf|||Fri Jan 14 23:14:06 UTC 2022
dc.source.uri 10.1103/PhysRevD.84.012006
dc.subject.disciplines Elementary Particles and Fields and String Theory
dc.subject.disciplines Physics
dc.title Event structure and double helicity asymmetry in jet production from polarized p plus p collisions at root s=200 GeV
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication 0c7465f3-a076-4319-9513-6cd51186bbf6
relation.isOrgUnitOfPublication 4a05cd4d-8749-4cff-96b1-32eca381d930
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