Measurement of jet suppression in central Pb-Pb collisions at root s(NN)=2.76 TeV

J. Adam; D. Adamová; MM. Aggarwal; G. Aglieri Rinella; M. Agnello; Z. Ahammed; Irfan Ahmed; S.U. Ahu; I Aimo; Hans Bøggild; Ian Bearden; Christian Holm Christensen; Kristjan Herlache Gulbrandsen; Marek Chojnacki; Jens Jørgen Gaardhøje; Børge Svane Nielsen; Alexander Colliander Hansen; Ante Bilandzic; Valentina Zaccolo

doi:10.1016/j.physletb.2015.04.039

Measurement of jet suppression in central Pb-Pb collisions at root s(NN)=2.76 TeV

J. Adam, D. Adamová, MM. Aggarwal, G. Aglieri Rinella, M. Agnello, Z. Ahammed, Irfan Ahmed, S.U. Ahu, I Aimo, Hans Bøggild, Ian Bearden, Christian Holm Christensen, Kristjan Herlache Gulbrandsen, Marek Chojnacki, Jens Jørgen Gaardhøje, Børge Svane Nielsen, Alexander Colliander Hansen, Ante Bilandzic, Valentina Zaccolo

Experimental Particle Physics

100 Citations (Scopus)

Abstract

The transverse momentum (p_T) spectrum and nuclear modification factor (R_AA) of reconstructed jets in 0–10% and 10–30% central Pb–Pb collisions at s_NN=2.76 TeV were measured. Jets were reconstructed using the anti-k_T jet algorithm with a resolution parameter of R=0.2 from charged and neutral particles, utilizing the ALICE tracking detectors and Electromagnetic Calorimeter (EMCal). The jet p_T spectra are reported in the pseudorapidity interval of |η_jet|<0.5 for 40<p_T,jet<120 GeV/c in 0–10% and for 30<p_T,jet<100 GeV/c in 10–30% collisions. Reconstructed jets were required to contain a leading charged particle with p_T>5 GeV/c to suppress jets constructed from the combinatorial background in Pb–Pb collisions. The leading charged particle requirement applied to jet spectra both in pp and Pb–Pb collisions had a negligible effect on the R_AA. The nuclear modification factor R_AA was found to be 0.28±0.04 in 0–10% and 0.35±0.04 in 10–30% collisions, independent of p_T,jet within the uncertainties of the measurement. The observed suppression is in fair agreement with expectations from two model calculations with different approaches to jet quenching.

Original language	English
Journal	Physics Letters B
Volume	746
Pages (from-to)	1-14
ISSN	0370-2693
DOIs	https://doi.org/10.1016/j.physletb.2015.04.039
Publication status	Published - 30 Jun 2015

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Adam, J., Adamová, D., Aggarwal, MM., Aglieri Rinella, G., Agnello, M., Ahammed, Z., Ahmed, I., Ahu, S. U., Aimo, I., Bøggild, H., Bearden, I., Christensen, C. H., Gulbrandsen, K. H., Chojnacki, M., Gaardhøje, J. J., Nielsen, B. S., Hansen, A. C., Bilandzic, A., & Zaccolo, V. (2015). Measurement of jet suppression in central Pb-Pb collisions at root s(NN)=2.76 TeV. Physics Letters B, 746, 1-14. https://doi.org/10.1016/j.physletb.2015.04.039

Adam, J, Adamová, D, Aggarwal, MM, Aglieri Rinella, G, Agnello, M, Ahammed, Z, Ahmed, I, Ahu, SU, Aimo, I, Bøggild, H , Bearden, I , Christensen, CH , Gulbrandsen, KH, Chojnacki, M, Gaardhøje, JJ , Nielsen, BS, Hansen, AC, Bilandzic, A & Zaccolo, V 2015, 'Measurement of jet suppression in central Pb-Pb collisions at root s(NN)=2.76 TeV', Physics Letters B, vol. 746, pp. 1-14. https://doi.org/10.1016/j.physletb.2015.04.039

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title = "Measurement of jet suppression in central Pb-Pb collisions at root s(NN)=2.76 TeV",

abstract = "The transverse momentum (pT) spectrum and nuclear modification factor (RAA) of reconstructed jets in 0–10% and 10–30% central Pb–Pb collisions at sNN=2.76 TeV were measured. Jets were reconstructed using the anti-kT jet algorithm with a resolution parameter of R=0.2 from charged and neutral particles, utilizing the ALICE tracking detectors and Electromagnetic Calorimeter (EMCal). The jet pT spectra are reported in the pseudorapidity interval of |ηjet|<0.5 for 40T,jet<120 GeV/c in 0–10% and for 30T,jet<100 GeV/c in 10–30% collisions. Reconstructed jets were required to contain a leading charged particle with pT>5 GeV/c to suppress jets constructed from the combinatorial background in Pb–Pb collisions. The leading charged particle requirement applied to jet spectra both in pp and Pb–Pb collisions had a negligible effect on the RAA. The nuclear modification factor RAA was found to be 0.28±0.04 in 0–10% and 0.35±0.04 in 10–30% collisions, independent of pT,jet within the uncertainties of the measurement. The observed suppression is in fair agreement with expectations from two model calculations with different approaches to jet quenching.",

author = "J. Adam and D. Adamov{\'a} and MM. Aggarwal and {Aglieri Rinella}, G. and M. Agnello and Z. Ahammed and Irfan Ahmed and S.U. Ahu and I Aimo and Hans B{\o}ggild and Ian Bearden and Christensen, {Christian Holm} and Gulbrandsen, {Kristjan Herlache} and Marek Chojnacki and Gaardh{\o}je, {Jens J{\o}rgen} and Nielsen, {B{\o}rge Svane} and Hansen, {Alexander Colliander} and Ante Bilandzic and Valentina Zaccolo",

year = "2015",

month = jun,

day = "30",

doi = "10.1016/j.physletb.2015.04.039",

language = "English",

volume = "746",

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T1 - Measurement of jet suppression in central Pb-Pb collisions at root s(NN)=2.76 TeV

AU - Adam, J.

AU - Adamová, D.

AU - Aggarwal, MM.

AU - Aglieri Rinella, G.

AU - Agnello, M.

AU - Ahammed, Z.

AU - Ahmed, Irfan

AU - Ahu, S.U.

AU - Aimo, I

AU - Bøggild, Hans

AU - Bearden, Ian

AU - Christensen, Christian Holm

AU - Gulbrandsen, Kristjan Herlache

AU - Chojnacki, Marek

AU - Gaardhøje, Jens Jørgen

AU - Nielsen, Børge Svane

AU - Hansen, Alexander Colliander

AU - Bilandzic, Ante

AU - Zaccolo, Valentina

PY - 2015/6/30

Y1 - 2015/6/30

N2 - The transverse momentum (pT) spectrum and nuclear modification factor (RAA) of reconstructed jets in 0–10% and 10–30% central Pb–Pb collisions at sNN=2.76 TeV were measured. Jets were reconstructed using the anti-kT jet algorithm with a resolution parameter of R=0.2 from charged and neutral particles, utilizing the ALICE tracking detectors and Electromagnetic Calorimeter (EMCal). The jet pT spectra are reported in the pseudorapidity interval of |ηjet|<0.5 for 40T,jet<120 GeV/c in 0–10% and for 30T,jet<100 GeV/c in 10–30% collisions. Reconstructed jets were required to contain a leading charged particle with pT>5 GeV/c to suppress jets constructed from the combinatorial background in Pb–Pb collisions. The leading charged particle requirement applied to jet spectra both in pp and Pb–Pb collisions had a negligible effect on the RAA. The nuclear modification factor RAA was found to be 0.28±0.04 in 0–10% and 0.35±0.04 in 10–30% collisions, independent of pT,jet within the uncertainties of the measurement. The observed suppression is in fair agreement with expectations from two model calculations with different approaches to jet quenching.

AB - The transverse momentum (pT) spectrum and nuclear modification factor (RAA) of reconstructed jets in 0–10% and 10–30% central Pb–Pb collisions at sNN=2.76 TeV were measured. Jets were reconstructed using the anti-kT jet algorithm with a resolution parameter of R=0.2 from charged and neutral particles, utilizing the ALICE tracking detectors and Electromagnetic Calorimeter (EMCal). The jet pT spectra are reported in the pseudorapidity interval of |ηjet|<0.5 for 40T,jet<120 GeV/c in 0–10% and for 30T,jet<100 GeV/c in 10–30% collisions. Reconstructed jets were required to contain a leading charged particle with pT>5 GeV/c to suppress jets constructed from the combinatorial background in Pb–Pb collisions. The leading charged particle requirement applied to jet spectra both in pp and Pb–Pb collisions had a negligible effect on the RAA. The nuclear modification factor RAA was found to be 0.28±0.04 in 0–10% and 0.35±0.04 in 10–30% collisions, independent of pT,jet within the uncertainties of the measurement. The observed suppression is in fair agreement with expectations from two model calculations with different approaches to jet quenching.

U2 - 10.1016/j.physletb.2015.04.039

DO - 10.1016/j.physletb.2015.04.039

M3 - Journal article

SN - 0370-2693

VL - 746

SP - 1

EP - 14

JO - Physics Letters B: Particle Physics, Nuclear Physics and Cosmology

JF - Physics Letters B: Particle Physics, Nuclear Physics and Cosmology

ER -

Measurement of jet suppression in central Pb-Pb collisions at root s(NN)=2.76 TeV

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