Title
Measurement of isolated photon production in pp and PbPb collisions at sNN=2.76 TeV
Date Issued
04 April 2012
Access level
open access
Resource Type
journal article
Author(s)
Chatrchyan S.
Khachatryan V.
Sirunyan A.M.
Tumasyan A.
Adam W.
Bergauer T.
Dragicevic M.
Erö J.
Fabjan C.
Friedl M.
Frühwirth R.
Ghete V.M.
Hammer J.
Hoch M.
Hörmann N.
Hrubec J.
Jeitler M.
Kiesenhofer W.
Knapitsch A.
Krammer M.
Liko D.
Mikulec I.
Pernicka M.
Rahbaran B.
Rohringer C.
Rohringer H.
Schöfbeck R.
Strauss J.
Taurok A.
Teischinger F.
Wagner P.
Waltenberger W.
Walzel G.
Widl E.
Wulz C.E.
Mossolov V.
Shumeiko N.
Suarez Gonzalez J.
Bansal S.
Benucci L.
Cornelis T.
De Wolf E.A.
Janssen X.
Luyckx S.
Maes T.
Mucibello L.
Ochesanu S.
Roland B.
Rougny R.
Selvaggi M.
Van Haevermaet H.
Van Mechelen P.
Van Remortel N.
Van Spilbeeck A.
Blekman F.
Blyweert S.
D'Hondt J.
Gonzalez Suarez R.
Kalogeropoulos A.
Maes M.
Olbrechts A.
Van Doninck W.
Van Mulders P.
Van Onsem G.P.
Villella I.
Charaf O.
Clerbaux B.
De Lentdecker G.
Dero V.
Gay A.P.R.
Hammad G.H.
Hreus T.
Léonard A.
Marage P.E.
Thomas L.
Vander Velde C.
Vanlaer P.
Wickens J.
Adler V.
Beernaert K.
Cimmino A.
Costantini S.
Grunewald M.
Klein B.
Lellouch J.
Marinov A.
Mccartin J.
Ocampo Rios A.A.
Ryckbosch D.
Strobbe N.
Thyssen F.
Tytgat M.
Vanelderen L.
Verwilligen P.
Walsh S.
Zaganidis N.
Basegmez S.
Bruno G.
Caudron J.
Ceard L.
Abstract
Isolated photon production is measured in proton-proton and lead-lead collisions at nucleon-nucleon centre-of-mass energies of 2.76 TeV in the pseudorapidity range |η|<1.44 and transverse energies E T between 20 and 80 GeV with the CMS detector at the LHC. The measured E T spectra are found to be in good agreement with next-to-leading-order perturbative QCD predictions. The ratio of PbPb to pp isolated photon E T-differential yields, scaled by the number of incoherent nucleon-nucleon collisions, is consistent with unity for all PbPb reaction centralities. © 2012 CERN.
Start page
256
End page
277
Volume
710
Issue
2
Language
English
OCDE Knowledge area
Física de partículas, Campos de la Física
Física nuclear
Subjects
Scopus EID
2-s2.0-84863375147
Source
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
ISSN of the container
03702693
Sponsor(s)
We wish to congratulate our colleagues in the CERN accelerator departments for the excellent performance of the LHC machine. We thank the technical and administrative staff at CERN and other CMS institutes. This work was supported by the Austrian Federal Ministry of Science and Research ; the Belgium Fonds de la Recherche Scientifique , and Fonds voor Wetenschappelijk Onderzoek ; the Brazilian Funding Agencies ( CNPq , CAPES , FAPERJ , and FAPESP ); the Bulgarian Ministry of Education and Science ; CERN ; the Chinese Academy of Sciences , Ministry of Science and Technology , and National Natural Science Foundation of China ; the Colombian Funding Agency (COLCIENCIAS) ; the Croatian Ministry of Science, Education and Sport ; the Research Promotion Foundation , Cyprus; the Estonian Academy of Sciences and NICPB ; the Academy of Finland , Finnish Ministry of Education and Culture , and Helsinki Institute of Physics ; the Institut National de Physique Nucléaire et de Physique des Particules/CNRS , and Commissariat à lʼÉnergie Atomique et aux Énergies Alternatives/CEA , France; the Bundesministerium für Bildung und Forschung , Deutsche Forschungsgemeinschaft , and Helmholtz-Gemeinschaft Deutscher Forschungszentren , Germany; the General Secretariat for Research and Technology , Greece; the National Scientific Research Foundation , and National Office for Research and Technology , Hungary; the Department of Atomic Energy and the Department of Science and Technology , India; the Institute for Studies in Theoretical Physics and Mathematics , Iran; the Science Foundation , Ireland; the Istituto Nazionale di Fisica Nucleare , Italy; the Korean Ministry of Education, Science and Technology and the World Class University Program of NRF , Korea; the Lithuanian Academy of Sciences ; the Mexican Funding Agencies ( CINVESTAV , CONACYT , SEP , and UASLP-FAI ); the Ministry of Science and Innovation , New Zealand; the Pakistan Atomic Energy Commission ; the State Commission for Scientific Research , Poland; the Fundação para a Ciência e a Tecnologia , Portugal; JINR (Armenia, Belarus, Georgia, Ukraine, Uzbekistan); the Ministry of Science and Technologies of the Russian Federation , the Russian Ministry of Atomic Energy and the Russian Foundation for Basic Research ; the Ministry of Science and Technological Development of Serbia ; the Ministerio de Ciencia e Innovación , and Programa Consolider–Ingenio 2010 , Spain; the Swiss Funding Agencies ( ETH Board , ETH Zurich , PSI , SNF , UniZH , Canton Zurich , and SER ); the National Science Council , Taipei; the Scientific and Technical Research Council of Turkey , and Turkish Atomic Energy Authority ; the Science and Technology Facilities Council , UK; the US Department of Energy , and the US National Science Foundation .
Individuals have received support from the Marie-Curie programme and the European Research Council (European Union); the Leventis Foundation ; the A.P. Sloan Foundation ; the Alexander von Humboldt Foundation ; the Belgian Federal Science Policy Office ; the Fonds pour la Formation à la Recherche dans lʼIndustrie et dans lʼAgriculture (FRIA-Belgium); the Agentschap voor Innovatie door Wetenschap en Technologie (IWT-Belgium); and the Council of Science and Industrial Research , India.
Sources of information:
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