Measurements of low-p(T) electrons from semileptonic heavy-flavour hadron decays at mid-rapidity in pp and Pb-Pb collisions at root s(NN)=2.A76 TeV

S. Acharya; F Acosta; D. Adamova; J Adolfsson; MM. Aggarwal; G.A. Rinella; A. Agnello; N. Agrawal; Z. Ahammed; S.U. Ahn; S. Aiola; A. Akindinov; M. Al-Turany; SN Alam; DSD Albuquerque; D. Aleksandrov; B Alessandro; Rafael A. Molina; Yusuf Ali; A. Alici; A. Alkin; J. Alme; T. Alt; Ian Bearden; Ante Bilandzic; Christian Alexander Bourjau; Marek Chojnacki; Katarina Gajdosova; Jens Jørgen Gaardhøje; bsm989 bsm989; Christian Holm Christensen; Børge Svane Nielsen; Freja Thoresen; You Zhou; Lais Ozelin De Lima Pimentel

doi:10.1007/JHEP10(2018)061

Measurements of low-p(T) electrons from semileptonic heavy-flavour hadron decays at mid-rapidity in pp and Pb-Pb collisions at root s(NN)=2.A76 TeV

S. Acharya, F Acosta, D. Adamova, J Adolfsson, MM. Aggarwal, G.A. Rinella, A. Agnello, N. Agrawal, Z. Ahammed, S.U. Ahn, S. Aiola, A. Akindinov, M. Al-Turany, SN Alam, DSD Albuquerque, D. Aleksandrov, B Alessandro, Rafael A. Molina, Yusuf Ali, A. AliciA. Alkin, J. Alme, T. Alt, Ian Bearden, Ante Bilandzic, Christian Alexander Bourjau, Marek Chojnacki, Katarina Gajdosova, Jens Jørgen Gaardhøje, bsm989 bsm989, Christian Holm Christensen, Børge Svane Nielsen, Freja Thoresen, You Zhou, Lais Ozelin De Lima Pimentel

Experimental Particle Physics

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Abstract

Transverse-momentum (p_T) differential yields of electrons from semileptonic heavy-flavour hadron decays have been measured in the most central (0–10%) and in semi-central (20–40%) Pb–Pb collisions at sNN=2.76 TeV. The corresponding production cross section in pp collisions has been measured at the same energy with substantially reduced systematic uncertainties with respect to previously published results. The modification of the yield in Pb–Pb collisions with respect to the expectation from an incoherent superposition of nucleon-nucleon collisions is quantified at mid-rapidity (|y| < 0.8) in the p_T interval 0.5–3 GeV/c via the nuclear modification factor, R_AA. This paper extends the p_T reach of the R_AA measurement towards significantly lower values with respect to a previous publication. In Pb–Pb collisions the p_T-differential measurements of yields at low p_T are essential to investigate the scaling of heavy-flavour production with the number of binary nucleon-nucleon collisions. Heavy-quark hadronization, a collective expansion and even initial-state effects, such as the nuclear modification of the Parton Distribution Function, are also expected to have a significant effect on the measured distribution.

Original language	English
Article number	061
Journal	The Journal of High Energy Physics
Volume	2018
Issue number	10
Number of pages	30
ISSN	1126-6708
DOIs	https://doi.org/10.1007/JHEP10(2018)061
Publication status	Published - 1 Oct 2018

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Acharya, S., Acosta, F., Adamova, D., Adolfsson, J., Aggarwal, MM., Rinella, G. A., Agnello, A., Agrawal, N., Ahammed, Z., Ahn, S. U., Aiola, S., Akindinov, A., Al-Turany, M., Alam, SN., Albuquerque, DSD., Aleksandrov, D., Alessandro, B., Molina, R. A., Ali, Y., ... Ozelin De Lima Pimentel, L. (2018). Measurements of low-p(T) electrons from semileptonic heavy-flavour hadron decays at mid-rapidity in pp and Pb-Pb collisions at root s(NN)=2.A76 TeV. The Journal of High Energy Physics, 2018(10), Article 061. https://doi.org/10.1007/JHEP10(2018)061

Acharya, S, Acosta, F, Adamova, D, Adolfsson, J, Aggarwal, MM, Rinella, GA, Agnello, A, Agrawal, N, Ahammed, Z, Ahn, SU, Aiola, S, Akindinov, A, Al-Turany, M, Alam, SN, Albuquerque, DSD, Aleksandrov, D, Alessandro, B, Molina, RA, Ali, Y, Alici, A, Alkin, A, Alme, J, Alt, T, Bearden, I, Bilandzic, A, Bourjau, CA, Chojnacki, M, Gajdosova, K, Gaardhøje, JJ , bsm989, B , Christensen, CH , Nielsen, BS, Thoresen, F, Zhou, Y & Ozelin De Lima Pimentel, L 2018, 'Measurements of low-p(T) electrons from semileptonic heavy-flavour hadron decays at mid-rapidity in pp and Pb-Pb collisions at root s(NN)=2.A76 TeV', The Journal of High Energy Physics, vol. 2018, no. 10, 061. https://doi.org/10.1007/JHEP10(2018)061

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title = "Measurements of low-p(T) electrons from semileptonic heavy-flavour hadron decays at mid-rapidity in pp and Pb-Pb collisions at root s(NN)=2.A76 TeV",

abstract = "Transverse-momentum (pT) differential yields of electrons from semileptonic heavy-flavour hadron decays have been measured in the most central (0–10%) and in semi-central (20–40%) Pb–Pb collisions at sNN=2.76 TeV. The corresponding production cross section in pp collisions has been measured at the same energy with substantially reduced systematic uncertainties with respect to previously published results. The modification of the yield in Pb–Pb collisions with respect to the expectation from an incoherent superposition of nucleon-nucleon collisions is quantified at mid-rapidity (|y| < 0.8) in the pT interval 0.5–3 GeV/c via the nuclear modification factor, RAA. This paper extends the pT reach of the RAA measurement towards significantly lower values with respect to a previous publication. In Pb–Pb collisions the pT-differential measurements of yields at low pT are essential to investigate the scaling of heavy-flavour production with the number of binary nucleon-nucleon collisions. Heavy-quark hadronization, a collective expansion and even initial-state effects, such as the nuclear modification of the Parton Distribution Function, are also expected to have a significant effect on the measured distribution.",

author = "S. Acharya and F Acosta and D. Adamova and J Adolfsson and MM. Aggarwal and G.A. Rinella and A. Agnello and N. Agrawal and Z. Ahammed and S.U. Ahn and S. Aiola and A. Akindinov and M. Al-Turany and SN Alam and DSD Albuquerque and D. Aleksandrov and B Alessandro and Molina, {Rafael A.} and Yusuf Ali and A. Alici and A. Alkin and J. Alme and T. Alt and Ian Bearden and Ante Bilandzic and Bourjau, {Christian Alexander} and Marek Chojnacki and Katarina Gajdosova and Gaardh{\o}je, {Jens J{\o}rgen} and bsm989 bsm989 and Christensen, {Christian Holm} and Nielsen, {B{\o}rge Svane} and Freja Thoresen and You Zhou and {Ozelin De Lima Pimentel}, Lais",

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doi = "10.1007/JHEP10(2018)061",

language = "English",

volume = "2018",

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T1 - Measurements of low-p(T) electrons from semileptonic heavy-flavour hadron decays at mid-rapidity in pp and Pb-Pb collisions at root s(NN)=2.A76 TeV

AU - Acharya, S.

AU - Acosta, F

AU - Adamova, D.

AU - Adolfsson, J

AU - Aggarwal, MM.

AU - Rinella, G.A.

AU - Agnello, A.

AU - Agrawal, N.

AU - Ahammed, Z.

AU - Ahn, S.U.

AU - Aiola, S.

AU - Akindinov, A.

AU - Al-Turany, M.

AU - Alam, SN

AU - Albuquerque, DSD

AU - Aleksandrov, D.

AU - Alessandro, B

AU - Molina, Rafael A.

AU - Ali, Yusuf

AU - Alici, A.

AU - Alkin, A.

AU - Alme, J.

AU - Alt, T.

AU - Bearden, Ian

AU - Bilandzic, Ante

AU - Bourjau, Christian Alexander

AU - Chojnacki, Marek

AU - Gajdosova, Katarina

AU - Gaardhøje, Jens Jørgen

AU - bsm989, bsm989

AU - Christensen, Christian Holm

AU - Nielsen, Børge Svane

AU - Thoresen, Freja

AU - Zhou, You

AU - Ozelin De Lima Pimentel, Lais

PY - 2018/10/1

Y1 - 2018/10/1

N2 - Transverse-momentum (pT) differential yields of electrons from semileptonic heavy-flavour hadron decays have been measured in the most central (0–10%) and in semi-central (20–40%) Pb–Pb collisions at sNN=2.76 TeV. The corresponding production cross section in pp collisions has been measured at the same energy with substantially reduced systematic uncertainties with respect to previously published results. The modification of the yield in Pb–Pb collisions with respect to the expectation from an incoherent superposition of nucleon-nucleon collisions is quantified at mid-rapidity (|y| < 0.8) in the pT interval 0.5–3 GeV/c via the nuclear modification factor, RAA. This paper extends the pT reach of the RAA measurement towards significantly lower values with respect to a previous publication. In Pb–Pb collisions the pT-differential measurements of yields at low pT are essential to investigate the scaling of heavy-flavour production with the number of binary nucleon-nucleon collisions. Heavy-quark hadronization, a collective expansion and even initial-state effects, such as the nuclear modification of the Parton Distribution Function, are also expected to have a significant effect on the measured distribution.

AB - Transverse-momentum (pT) differential yields of electrons from semileptonic heavy-flavour hadron decays have been measured in the most central (0–10%) and in semi-central (20–40%) Pb–Pb collisions at sNN=2.76 TeV. The corresponding production cross section in pp collisions has been measured at the same energy with substantially reduced systematic uncertainties with respect to previously published results. The modification of the yield in Pb–Pb collisions with respect to the expectation from an incoherent superposition of nucleon-nucleon collisions is quantified at mid-rapidity (|y| < 0.8) in the pT interval 0.5–3 GeV/c via the nuclear modification factor, RAA. This paper extends the pT reach of the RAA measurement towards significantly lower values with respect to a previous publication. In Pb–Pb collisions the pT-differential measurements of yields at low pT are essential to investigate the scaling of heavy-flavour production with the number of binary nucleon-nucleon collisions. Heavy-quark hadronization, a collective expansion and even initial-state effects, such as the nuclear modification of the Parton Distribution Function, are also expected to have a significant effect on the measured distribution.

U2 - 10.1007/JHEP10(2018)061

DO - 10.1007/JHEP10(2018)061

M3 - Journal article

SN - 1126-6708

VL - 2018

JO - The Journal of High Energy Physics

JF - The Journal of High Energy Physics

IS - 10

M1 - 061

ER -

Measurements of low-p(T) electrons from semileptonic heavy-flavour hadron decays at mid-rapidity in pp and Pb-Pb collisions at root s(NN)=2.A76 TeV

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