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Top-quark pair production cross sections at NNLO+NNLL in pPb collisions at $\sqrt{s_{NN}}$ = 8.16 TeV

Total and fiducial top pair ($t\bar{t}$) production cross sections in proton-lead (pPb) collisions at $\sqrt{s_{NN}}$ = 8.16 TeV are computed at next-to-next-to-leading-order (NNLO) accuracy including next-to-next-to-leading-log (NNLL) gluon resummation, using the CT14 and CT10 proton parton distrib...

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Autor principal: d'Enterria, David
Lenguaje:eng
Publicado: 2019
Materias:
Acceso en línea:http://cds.cern.ch/record/2275024
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author d'Enterria, David
author_facet d'Enterria, David
author_sort d'Enterria, David
collection CERN
description Total and fiducial top pair ($t\bar{t}$) production cross sections in proton-lead (pPb) collisions at $\sqrt{s_{NN}}$ = 8.16 TeV are computed at next-to-next-to-leading-order (NNLO) accuracy including next-to-next-to-leading-log (NNLL) gluon resummation, using the CT14 and CT10 proton parton distribution functions (PDF), and the EPPS16 and EPS09 nuclear PDF parametrizations for the lead ion. The total cross sections amount to $\sigma(pPb\to t\bar{t}+X) = 59.0 \pm 5.3$(CT14+EPPS16)$\,^{+1.6}_{-2.1}$(scale) nb, and $57.5 \pm \,^{+4.3}_{-3.3}$(CT10+EPS09)$\,^{+1.5}_{-2.0}$(scale) nb, with small modifications with respect to the result computed using the free proton PDF alone. The normalized ratio of pPb to pp cross sections (nuclear modification factor) is $R_{pPb} = 1.04 \,^{\pm 0.07(EPPS16)}_{\pm0.03(EPS09)}$. In the lepton+jets decay mode, $t\bar{t} \to b\bar{b} W(\ell\nu) W(q\bar{q}')$, one expects $\sim$600 $t\bar{t}$ events in the 180 nb$^{-1}$ integrated luminosity collected in pPb collisions at the LHC so far, after typical acceptance and efficiency losses. Differential cross sections at NLO accuracy are presented as a function of transverse momentum and rapidity of the top quarks, and of their decay b-jets and isolated leptons.
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language eng
publishDate 2019
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spelling cern-22750242022-01-14T15:22:26Zhttp://cds.cern.ch/record/2275024engd'Enterria, DavidTop-quark pair production cross sections at NNLO+NNLL in pPb collisions at $\sqrt{s_{NN}}$ = 8.16 TeVnucl-thNuclear Physics - Theorynucl-exNuclear Physics - Experimenthep-exParticle Physics - Experimenthep-phParticle Physics - PhenomenologyTotal and fiducial top pair ($t\bar{t}$) production cross sections in proton-lead (pPb) collisions at $\sqrt{s_{NN}}$ = 8.16 TeV are computed at next-to-next-to-leading-order (NNLO) accuracy including next-to-next-to-leading-log (NNLL) gluon resummation, using the CT14 and CT10 proton parton distribution functions (PDF), and the EPPS16 and EPS09 nuclear PDF parametrizations for the lead ion. The total cross sections amount to $\sigma(pPb\to t\bar{t}+X) = 59.0 \pm 5.3$(CT14+EPPS16)$\,^{+1.6}_{-2.1}$(scale) nb, and $57.5 \pm \,^{+4.3}_{-3.3}$(CT10+EPS09)$\,^{+1.5}_{-2.0}$(scale) nb, with small modifications with respect to the result computed using the free proton PDF alone. The normalized ratio of pPb to pp cross sections (nuclear modification factor) is $R_{pPb} = 1.04 \,^{\pm 0.07(EPPS16)}_{\pm0.03(EPS09)}$. In the lepton+jets decay mode, $t\bar{t} \to b\bar{b} W(\ell\nu) W(q\bar{q}')$, one expects $\sim$600 $t\bar{t}$ events in the 180 nb$^{-1}$ integrated luminosity collected in pPb collisions at the LHC so far, after typical acceptance and efficiency losses. Differential cross sections at NLO accuracy are presented as a function of transverse momentum and rapidity of the top quarks, and of their decay b-jets and isolated leptons.arXiv:1706.09521oai:cds.cern.ch:22750242019
spellingShingle nucl-th
Nuclear Physics - Theory
nucl-ex
Nuclear Physics - Experiment
hep-ex
Particle Physics - Experiment
hep-ph
Particle Physics - Phenomenology
d'Enterria, David
Top-quark pair production cross sections at NNLO+NNLL in pPb collisions at $\sqrt{s_{NN}}$ = 8.16 TeV
title Top-quark pair production cross sections at NNLO+NNLL in pPb collisions at $\sqrt{s_{NN}}$ = 8.16 TeV
title_full Top-quark pair production cross sections at NNLO+NNLL in pPb collisions at $\sqrt{s_{NN}}$ = 8.16 TeV
title_fullStr Top-quark pair production cross sections at NNLO+NNLL in pPb collisions at $\sqrt{s_{NN}}$ = 8.16 TeV
title_full_unstemmed Top-quark pair production cross sections at NNLO+NNLL in pPb collisions at $\sqrt{s_{NN}}$ = 8.16 TeV
title_short Top-quark pair production cross sections at NNLO+NNLL in pPb collisions at $\sqrt{s_{NN}}$ = 8.16 TeV
title_sort top-quark pair production cross sections at nnlo+nnll in ppb collisions at $\sqrt{s_{nn}}$ = 8.16 tev
topic nucl-th
Nuclear Physics - Theory
nucl-ex
Nuclear Physics - Experiment
hep-ex
Particle Physics - Experiment
hep-ph
Particle Physics - Phenomenology
url http://cds.cern.ch/record/2275024
work_keys_str_mv AT denterriadavid topquarkpairproductioncrosssectionsatnnlonnllinppbcollisionsatsqrtsnn816tev