Measurement of jet suppression in central Pb–Pb collisions at √sNN=2.76 TeV

ALICE Collaboration

doi:10.1016/j.physletb.2015.04.039

Measurement of jet suppression in central Pb–Pb collisions at √s_NN=2.76 TeV

ALICE Collaboration

Department of Physics

Research output: Contribution to journal › Article › peer-review

131 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
Pages (from-to)	1-14
Number of pages	14
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	746
DOIs	https://doi.org/10.1016/j.physletb.2015.04.039
Publication status	Published - 2015 Jun 30

Bibliographical note

Funding Information:
The ALICE Collaboration would like to thank all its engineers and technicians for their invaluable contributions to the construction of the experiment and the CERN accelerator teams for the outstanding performance of the LHC complex. The ALICE Collaboration gratefully acknowledges the resources and support provided by all Grid centers and the Worldwide LHC Computing Grid (WLCG) collaboration. The ALICE Collaboration acknowledges the following funding agencies for their support in building and running the ALICE detector: State Committee of Science, World Federation of Scientists (WFS) and Swiss Fonds Kidagan, Armenia; Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Financiadora de Estudos e Projetos (FINEP), Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); National Natural Science Foundation of China (NSFC), the Chinese Ministry of Education (CMOE) and the Ministry of Science and Technology of China (MSTC); Ministry of Education and Youth of the Czech Republic; Danish Natural Science Research Council, the Carlsberg Foundation and the Danish National Research Foundation; The European Research Council under the European Community's Seventh Framework Programme; Helsinki Institute of Physics and the Academy of Finland; French CNRS–IN2P3, the ‘Region Pays de Loire’ ‘Region Alsace’ ‘Region Auvergne’ and CEA, France; German Bundesministerium fur Bildung, Wissenschaft, Forschung und Technologie (BMBF) and the Helmholtz Association; General Secretariat for Research and Technology, Ministry of Development, Greece; Hungarian Orszagos Tudomanyos Kutatasi Alappgrammok (OTKA) and National Office for Research and Technology (NKTH); Department of Atomic Energy and Department of Science and Technology of the Government of India; Istituto Nazionale di Fisica Nucleare (INFN) and Centro Fermi – Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi” Italy; MEXT Grant-in-Aid for Specially Promoted Research, Japan; Joint Institute for Nuclear Research, Dubna; National Research Foundation of Korea (NRF); Consejo Nacional de Cienca y Tecnologia (CONACYT), Direccion General de Asuntos del Personal Academico (DGAPA), México, Amerique Latine Formation academique–European Commission (ALFA–EC) and the EPLANET Program (European Particle Physics Latin American Network); Stichting voor Fundamenteel Onderzoek der Materie (FOM) and the Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO), Netherlands; Research Council of Norway (NFR); National Science Centre of Poland; Ministry of National Education/Institute for Atomic Physics and Consiliul Naţional al Cercetării Ştiinţifice–Executive Agency for Higher Education Research Development and Innovation Funding (CNCS–UEFISCDI), Romania; Ministry of Education and Science of Russian Federation, Russian Academy of Sciences, Russian Federal Agency of Atomic Energy, Russian Federal Agency for Science and Innovations and The Russian Foundation for Basic Research; Ministry of Education of Slovakia; Department of Science and Technology, Republic of South Africa; Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas (CIEMAT), E-Infrastructure shared between Europe and Latin America (EELA), Ministerio de Economía y Competitividad (MINECO) of Spain, Xunta de Galicia (Consellería de Educación), Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear (CEADEN), Cubaenergía, Cuba, and IAEA (International Atomic Energy Agency); Swedish Research Council (VR) and Knut & Alice Wallenberg Foundation (KAW); Ukraine Ministry of Education and Science; United Kingdom Science and Technology Facilities Council (STFC); The United States Department of Energy, the United States National Science Foundation, the State of Texas, and the State of Ohio; Ministry of Science, Education and Sports of Croatia and Unity through Knowledge Fund, Croatia. Council of Scientific and Industrial Research (CSIR), New Delhi, India.

Funding Information:
The ALICE Collaboration would like to thank all its engineers and technicians for their invaluable contributions to the construction of the experiment and the CERN accelerator teams for the outstanding performance of the LHC complex. The ALICE Collaboration gratefully acknowledges the resources and support provided by all Grid centers and the Worldwide LHC Computing Grid (WLCG) collaboration. The ALICE Collaboration acknowledges the following funding agencies for their support in building and running the ALICE detector: State Committee of Science , World Federation of Scientists (WFS) and Swiss Fonds Kidagan , Armenia; Conselho Nacional de Desenvolvimento Científico e Tecnológico ( CNPq ), Financiadora de Estudos e Projetos ( FINEP ), Fundação de Amparo à Pesquisa do Estado de São Paulo ( FAPESP ); National Natural Science Foundation of China ( NSFC ), the Chinese Ministry of Education (CMOE) and the Ministry of Science and Technology of China (MSTC); Ministry of Education and Youth of the Czech Republic ; Danish Natural Science Research Council , the Carlsberg Foundation and the Danish National Research Foundation ; The European Research Council under the European Community's Seventh Framework Programme ; Helsinki Institute of Physics and the Academy of Finland ; French CNRS–IN2P3 , the ‘Region Pays de Loire’, ‘Region Alsace’, ‘Region Auvergne’ and CEA , France; German Bundesministerium fur Bildung, Wissenschaft, Forschung und Technologie ( BMBF ) and the Helmholtz Association ; General Secretariat for Research and Technology , Ministry of Development , Greece; Hungarian Orszagos Tudomanyos Kutatasi Alappgrammok ( OTKA ) and National Office for Research and Technology ( NKTH ); Department of Atomic Energy and Department of Science and Technology of the Government of India ; Istituto Nazionale di Fisica Nucleare ( INFN ) and Centro Fermi – Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi” , Italy; MEXT Grant-in-Aid for Specially Promoted Research, Japan; Joint Institute for Nuclear Research , Dubna; National Research Foundation of Korea (NRF); Consejo Nacional de Cienca y Tecnologia ( CONACYT ), Direccion General de Asuntos del Personal Academico ( DGAPA ), México, Amerique Latine Formation academique–European Commission ( ALFA–EC ) and the EPLANET Program (European Particle Physics Latin American Network); Stichting voor Fundamenteel Onderzoek der Materie ( FOM ) and the Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO), Netherlands; Research Council of Norway (NFR); National Science Centre of Poland ; Ministry of National Education/Institute for Atomic Physics and Consiliul Naţional al Cercetării Ştiinţifice–Executive Agency for Higher Education Research Development and Innovation Funding ( CNCS–UEFISCDI ), Romania; Ministry of Education and Science of Russian Federation , Russian Academy of Sciences , Russian Federal Agency of Atomic Energy , Russian Federal Agency for Science and Innovations and The Russian Foundation for Basic Research ; Ministry of Education of Slovakia ; Department of Science and Technology, Republic of South Africa ; Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas (CIEMAT), E-Infrastructure shared between Europe and Latin America ( EELA ), Ministerio de Economía y Competitividad (MINECO) of Spain, Xunta de Galicia (Consellería de Educación), Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear ( CEADEN ), Cubaenergía , Cuba, and IAEA ( International Atomic Energy Agency ); Swedish Research Council (VR) and Knut & Alice Wallenberg Foundation (KAW); Ukraine Ministry of Education and Science ; United Kingdom Science and Technology Facilities Council (STFC); The United States Department of Energy , the United States National Science Foundation , the State of Texas, and the State of Ohio; Ministry of Science, Education and Sports of Croatia and Unity through Knowledge Fund , Croatia. Council of Scientific and Industrial Research (CSIR), New Delhi, India.

Publisher Copyright:
© 2015 CERN for the benefit of the ALICE Collaboration

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics

Access to Document

10.1016/j.physletb.2015.04.039

Cite this

@article{ca84a1bd1a8c49dabb86ad8004c2d5a0,

title = "Measurement of jet suppression in central Pb–Pb collisions at √sNN=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 = "{ALICE Collaboration} and J. Adam and D. Adamov{\'a} and Aggarwal, {M. M.} and {Aglieri Rinella}, G. and M. Agnello and N. Agrawal and Z. Ahammed and I. Ahmed and Ahn, {S. U.} and I. Aimo and S. Aiola and M. Ajaz and A. Akindinov and Alam, {S. N.} and D. Aleksandrov and B. Alessandro and D. Alexandre and {Alfaro Molina}, R. and A. Alici and A. Alkin and J. Alme and T. Alt and S. Altinpinar and I. Altsybeev and {Alves Garcia Prado}, C. and C. Andrei and A. Andronic and V. Anguelov and J. Anielski and T. Anti{\v c}i{\'c} and F. Antinori and P. Antonioli and L. Aphecetche and H. Appelsh{\"a}user and S. Arcelli and N. Armesto and R. Arnaldi and T. Aronsson and Arsene, {I. C.} and M. Arslandok and A. Augustinus and R. Averbeck and Azmi, {M. D.} and M. Bach and A. Badal{\`a} and Baek, {Y. W.} and S. Bagnasco and R. Bailhache and Kang, {J. H.} and Y. Kwon",

note = "Funding Information: The ALICE Collaboration would like to thank all its engineers and technicians for their invaluable contributions to the construction of the experiment and the CERN accelerator teams for the outstanding performance of the LHC complex. The ALICE Collaboration gratefully acknowledges the resources and support provided by all Grid centers and the Worldwide LHC Computing Grid (WLCG) collaboration. The ALICE Collaboration acknowledges the following funding agencies for their support in building and running the ALICE detector: State Committee of Science, World Federation of Scientists (WFS) and Swiss Fonds Kidagan, Armenia; Conselho Nacional de Desenvolvimento Cient{\'i}fico e Tecnol{\'o}gico (CNPq), Financiadora de Estudos e Projetos (FINEP), Funda{\c c}{\~a}o de Amparo {\`a} Pesquisa do Estado de S{\~a}o Paulo (FAPESP); National Natural Science Foundation of China (NSFC), the Chinese Ministry of Education (CMOE) and the Ministry of Science and Technology of China (MSTC); Ministry of Education and Youth of the Czech Republic; Danish Natural Science Research Council, the Carlsberg Foundation and the Danish National Research Foundation; The European Research Council under the European Community's Seventh Framework Programme; Helsinki Institute of Physics and the Academy of Finland; French CNRS–IN2P3, the {\textquoteleft}Region Pays de Loire{\textquoteright} {\textquoteleft}Region Alsace{\textquoteright} {\textquoteleft}Region Auvergne{\textquoteright} and CEA, France; German Bundesministerium fur Bildung, Wissenschaft, Forschung und Technologie (BMBF) and the Helmholtz Association; General Secretariat for Research and Technology, Ministry of Development, Greece; Hungarian Orszagos Tudomanyos Kutatasi Alappgrammok (OTKA) and National Office for Research and Technology (NKTH); Department of Atomic Energy and Department of Science and Technology of the Government of India; Istituto Nazionale di Fisica Nucleare (INFN) and Centro Fermi – Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi” Italy; MEXT Grant-in-Aid for Specially Promoted Research, Japan; Joint Institute for Nuclear Research, Dubna; National Research Foundation of Korea (NRF); Consejo Nacional de Cienca y Tecnologia (CONACYT), Direccion General de Asuntos del Personal Academico (DGAPA), M{\'e}xico, Amerique Latine Formation academique–European Commission (ALFA–EC) and the EPLANET Program (European Particle Physics Latin American Network); Stichting voor Fundamenteel Onderzoek der Materie (FOM) and the Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO), Netherlands; Research Council of Norway (NFR); National Science Centre of Poland; Ministry of National Education/Institute for Atomic Physics and Consiliul Na{\c t}ional al Cercet{\u a}rii {\c S}tiin{\c t}ifice–Executive Agency for Higher Education Research Development and Innovation Funding (CNCS–UEFISCDI), Romania; Ministry of Education and Science of Russian Federation, Russian Academy of Sciences, Russian Federal Agency of Atomic Energy, Russian Federal Agency for Science and Innovations and The Russian Foundation for Basic Research; Ministry of Education of Slovakia; Department of Science and Technology, Republic of South Africa; Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas (CIEMAT), E-Infrastructure shared between Europe and Latin America (EELA), Ministerio de Econom{\'i}a y Competitividad (MINECO) of Spain, Xunta de Galicia (Conseller{\'i}a de Educaci{\'o}n), Centro de Aplicaciones Tecnol{\'o}gicas y Desarrollo Nuclear (CEADEN), Cubaenerg{\'i}a, Cuba, and IAEA (International Atomic Energy Agency); Swedish Research Council (VR) and Knut & Alice Wallenberg Foundation (KAW); Ukraine Ministry of Education and Science; United Kingdom Science and Technology Facilities Council (STFC); The United States Department of Energy, the United States National Science Foundation, the State of Texas, and the State of Ohio; Ministry of Science, Education and Sports of Croatia and Unity through Knowledge Fund, Croatia. Council of Scientific and Industrial Research (CSIR), New Delhi, India. Funding Information: The ALICE Collaboration would like to thank all its engineers and technicians for their invaluable contributions to the construction of the experiment and the CERN accelerator teams for the outstanding performance of the LHC complex. The ALICE Collaboration gratefully acknowledges the resources and support provided by all Grid centers and the Worldwide LHC Computing Grid (WLCG) collaboration. The ALICE Collaboration acknowledges the following funding agencies for their support in building and running the ALICE detector: State Committee of Science , World Federation of Scientists (WFS) and Swiss Fonds Kidagan , Armenia; Conselho Nacional de Desenvolvimento Cient{\'i}fico e Tecnol{\'o}gico ( CNPq ), Financiadora de Estudos e Projetos ( FINEP ), Funda{\c c}{\~a}o de Amparo {\`a} Pesquisa do Estado de S{\~a}o Paulo ( FAPESP ); National Natural Science Foundation of China ( NSFC ), the Chinese Ministry of Education (CMOE) and the Ministry of Science and Technology of China (MSTC); Ministry of Education and Youth of the Czech Republic ; Danish Natural Science Research Council , the Carlsberg Foundation and the Danish National Research Foundation ; The European Research Council under the European Community's Seventh Framework Programme ; Helsinki Institute of Physics and the Academy of Finland ; French CNRS–IN2P3 , the {\textquoteleft}Region Pays de Loire{\textquoteright}, {\textquoteleft}Region Alsace{\textquoteright}, {\textquoteleft}Region Auvergne{\textquoteright} and CEA , France; German Bundesministerium fur Bildung, Wissenschaft, Forschung und Technologie ( BMBF ) and the Helmholtz Association ; General Secretariat for Research and Technology , Ministry of Development , Greece; Hungarian Orszagos Tudomanyos Kutatasi Alappgrammok ( OTKA ) and National Office for Research and Technology ( NKTH ); Department of Atomic Energy and Department of Science and Technology of the Government of India ; Istituto Nazionale di Fisica Nucleare ( INFN ) and Centro Fermi – Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi” , Italy; MEXT Grant-in-Aid for Specially Promoted Research, Japan; Joint Institute for Nuclear Research , Dubna; National Research Foundation of Korea (NRF); Consejo Nacional de Cienca y Tecnologia ( CONACYT ), Direccion General de Asuntos del Personal Academico ( DGAPA ), M{\'e}xico, Amerique Latine Formation academique–European Commission ( ALFA–EC ) and the EPLANET Program (European Particle Physics Latin American Network); Stichting voor Fundamenteel Onderzoek der Materie ( FOM ) and the Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO), Netherlands; Research Council of Norway (NFR); National Science Centre of Poland ; Ministry of National Education/Institute for Atomic Physics and Consiliul Na{\c t}ional al Cercet{\u a}rii {\c S}tiin{\c t}ifice–Executive Agency for Higher Education Research Development and Innovation Funding ( CNCS–UEFISCDI ), Romania; Ministry of Education and Science of Russian Federation , Russian Academy of Sciences , Russian Federal Agency of Atomic Energy , Russian Federal Agency for Science and Innovations and The Russian Foundation for Basic Research ; Ministry of Education of Slovakia ; Department of Science and Technology, Republic of South Africa ; Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas (CIEMAT), E-Infrastructure shared between Europe and Latin America ( EELA ), Ministerio de Econom{\'i}a y Competitividad (MINECO) of Spain, Xunta de Galicia (Conseller{\'i}a de Educaci{\'o}n), Centro de Aplicaciones Tecnol{\'o}gicas y Desarrollo Nuclear ( CEADEN ), Cubaenerg{\'i}a , Cuba, and IAEA ( International Atomic Energy Agency ); Swedish Research Council (VR) and Knut & Alice Wallenberg Foundation (KAW); Ukraine Ministry of Education and Science ; United Kingdom Science and Technology Facilities Council (STFC); The United States Department of Energy , the United States National Science Foundation , the State of Texas, and the State of Ohio; Ministry of Science, Education and Sports of Croatia and Unity through Knowledge Fund , Croatia. Council of Scientific and Industrial Research (CSIR), New Delhi, India. Publisher Copyright: {\textcopyright} 2015 CERN for the benefit of the ALICE Collaboration",

year = "2015",

month = jun,

day = "30",

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

language = "English",

volume = "746",

pages = "1--14",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier",

}

TY - JOUR

T1 - Measurement of jet suppression in central Pb–Pb collisions at √sNN=2.76 TeV

AU - ALICE Collaboration

AU - Adam, J.

AU - Adamová, D.

AU - Aggarwal, M. M.

AU - Aglieri Rinella, G.

AU - Agnello, M.

AU - Agrawal, N.

AU - Ahammed, Z.

AU - Ahmed, I.

AU - Ahn, S. U.

AU - Aimo, I.

AU - Aiola, S.

AU - Ajaz, M.

AU - Akindinov, A.

AU - Alam, S. N.

AU - Aleksandrov, D.

AU - Alessandro, B.

AU - Alexandre, D.

AU - Alfaro Molina, R.

AU - Alici, A.

AU - Alkin, A.

AU - Alme, J.

AU - Alt, T.

AU - Altinpinar, S.

AU - Altsybeev, I.

AU - Alves Garcia Prado, C.

AU - Andrei, C.

AU - Andronic, A.

AU - Anguelov, V.

AU - Anielski, J.

AU - Antičić, T.

AU - Antinori, F.

AU - Antonioli, P.

AU - Aphecetche, L.

AU - Appelshäuser, H.

AU - Arcelli, S.

AU - Armesto, N.

AU - Arnaldi, R.

AU - Aronsson, T.

AU - Arsene, I. C.

AU - Arslandok, M.

AU - Augustinus, A.

AU - Averbeck, R.

AU - Azmi, M. D.

AU - Bach, M.

AU - Badalà, A.

AU - Baek, Y. W.

AU - Bagnasco, S.

AU - Bailhache, R.

AU - Kang, J. H.

AU - Kwon, Y.

N1 - Funding Information: The ALICE Collaboration would like to thank all its engineers and technicians for their invaluable contributions to the construction of the experiment and the CERN accelerator teams for the outstanding performance of the LHC complex. The ALICE Collaboration gratefully acknowledges the resources and support provided by all Grid centers and the Worldwide LHC Computing Grid (WLCG) collaboration. The ALICE Collaboration acknowledges the following funding agencies for their support in building and running the ALICE detector: State Committee of Science, World Federation of Scientists (WFS) and Swiss Fonds Kidagan, Armenia; Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Financiadora de Estudos e Projetos (FINEP), Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); National Natural Science Foundation of China (NSFC), the Chinese Ministry of Education (CMOE) and the Ministry of Science and Technology of China (MSTC); Ministry of Education and Youth of the Czech Republic; Danish Natural Science Research Council, the Carlsberg Foundation and the Danish National Research Foundation; The European Research Council under the European Community's Seventh Framework Programme; Helsinki Institute of Physics and the Academy of Finland; French CNRS–IN2P3, the ‘Region Pays de Loire’ ‘Region Alsace’ ‘Region Auvergne’ and CEA, France; German Bundesministerium fur Bildung, Wissenschaft, Forschung und Technologie (BMBF) and the Helmholtz Association; General Secretariat for Research and Technology, Ministry of Development, Greece; Hungarian Orszagos Tudomanyos Kutatasi Alappgrammok (OTKA) and National Office for Research and Technology (NKTH); Department of Atomic Energy and Department of Science and Technology of the Government of India; Istituto Nazionale di Fisica Nucleare (INFN) and Centro Fermi – Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi” Italy; MEXT Grant-in-Aid for Specially Promoted Research, Japan; Joint Institute for Nuclear Research, Dubna; National Research Foundation of Korea (NRF); Consejo Nacional de Cienca y Tecnologia (CONACYT), Direccion General de Asuntos del Personal Academico (DGAPA), México, Amerique Latine Formation academique–European Commission (ALFA–EC) and the EPLANET Program (European Particle Physics Latin American Network); Stichting voor Fundamenteel Onderzoek der Materie (FOM) and the Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO), Netherlands; Research Council of Norway (NFR); National Science Centre of Poland; Ministry of National Education/Institute for Atomic Physics and Consiliul Naţional al Cercetării Ştiinţifice–Executive Agency for Higher Education Research Development and Innovation Funding (CNCS–UEFISCDI), Romania; Ministry of Education and Science of Russian Federation, Russian Academy of Sciences, Russian Federal Agency of Atomic Energy, Russian Federal Agency for Science and Innovations and The Russian Foundation for Basic Research; Ministry of Education of Slovakia; Department of Science and Technology, Republic of South Africa; Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas (CIEMAT), E-Infrastructure shared between Europe and Latin America (EELA), Ministerio de Economía y Competitividad (MINECO) of Spain, Xunta de Galicia (Consellería de Educación), Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear (CEADEN), Cubaenergía, Cuba, and IAEA (International Atomic Energy Agency); Swedish Research Council (VR) and Knut & Alice Wallenberg Foundation (KAW); Ukraine Ministry of Education and Science; United Kingdom Science and Technology Facilities Council (STFC); The United States Department of Energy, the United States National Science Foundation, the State of Texas, and the State of Ohio; Ministry of Science, Education and Sports of Croatia and Unity through Knowledge Fund, Croatia. Council of Scientific and Industrial Research (CSIR), New Delhi, India. Funding Information: The ALICE Collaboration would like to thank all its engineers and technicians for their invaluable contributions to the construction of the experiment and the CERN accelerator teams for the outstanding performance of the LHC complex. The ALICE Collaboration gratefully acknowledges the resources and support provided by all Grid centers and the Worldwide LHC Computing Grid (WLCG) collaboration. The ALICE Collaboration acknowledges the following funding agencies for their support in building and running the ALICE detector: State Committee of Science , World Federation of Scientists (WFS) and Swiss Fonds Kidagan , Armenia; Conselho Nacional de Desenvolvimento Científico e Tecnológico ( CNPq ), Financiadora de Estudos e Projetos ( FINEP ), Fundação de Amparo à Pesquisa do Estado de São Paulo ( FAPESP ); National Natural Science Foundation of China ( NSFC ), the Chinese Ministry of Education (CMOE) and the Ministry of Science and Technology of China (MSTC); Ministry of Education and Youth of the Czech Republic ; Danish Natural Science Research Council , the Carlsberg Foundation and the Danish National Research Foundation ; The European Research Council under the European Community's Seventh Framework Programme ; Helsinki Institute of Physics and the Academy of Finland ; French CNRS–IN2P3 , the ‘Region Pays de Loire’, ‘Region Alsace’, ‘Region Auvergne’ and CEA , France; German Bundesministerium fur Bildung, Wissenschaft, Forschung und Technologie ( BMBF ) and the Helmholtz Association ; General Secretariat for Research and Technology , Ministry of Development , Greece; Hungarian Orszagos Tudomanyos Kutatasi Alappgrammok ( OTKA ) and National Office for Research and Technology ( NKTH ); Department of Atomic Energy and Department of Science and Technology of the Government of India ; Istituto Nazionale di Fisica Nucleare ( INFN ) and Centro Fermi – Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi” , Italy; MEXT Grant-in-Aid for Specially Promoted Research, Japan; Joint Institute for Nuclear Research , Dubna; National Research Foundation of Korea (NRF); Consejo Nacional de Cienca y Tecnologia ( CONACYT ), Direccion General de Asuntos del Personal Academico ( DGAPA ), México, Amerique Latine Formation academique–European Commission ( ALFA–EC ) and the EPLANET Program (European Particle Physics Latin American Network); Stichting voor Fundamenteel Onderzoek der Materie ( FOM ) and the Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO), Netherlands; Research Council of Norway (NFR); National Science Centre of Poland ; Ministry of National Education/Institute for Atomic Physics and Consiliul Naţional al Cercetării Ştiinţifice–Executive Agency for Higher Education Research Development and Innovation Funding ( CNCS–UEFISCDI ), Romania; Ministry of Education and Science of Russian Federation , Russian Academy of Sciences , Russian Federal Agency of Atomic Energy , Russian Federal Agency for Science and Innovations and The Russian Foundation for Basic Research ; Ministry of Education of Slovakia ; Department of Science and Technology, Republic of South Africa ; Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas (CIEMAT), E-Infrastructure shared between Europe and Latin America ( EELA ), Ministerio de Economía y Competitividad (MINECO) of Spain, Xunta de Galicia (Consellería de Educación), Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear ( CEADEN ), Cubaenergía , Cuba, and IAEA ( International Atomic Energy Agency ); Swedish Research Council (VR) and Knut & Alice Wallenberg Foundation (KAW); Ukraine Ministry of Education and Science ; United Kingdom Science and Technology Facilities Council (STFC); The United States Department of Energy , the United States National Science Foundation , the State of Texas, and the State of Ohio; Ministry of Science, Education and Sports of Croatia and Unity through Knowledge Fund , Croatia. Council of Scientific and Industrial Research (CSIR), New Delhi, India. Publisher Copyright: © 2015 CERN for the benefit of the ALICE Collaboration

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.

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U2 - 10.1016/j.physletb.2015.04.039

DO - 10.1016/j.physletb.2015.04.039

M3 - Article

AN - SCOPUS:85040565135

SN - 0370-2693

VL - 746

SP - 1

EP - 14

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

ER -