Direct photon production in Pb–Pb collisions at sNN=2.76 TeV
J. Adam,D. Adamová,M. M. Aggarwal,G. Aglieri Rinella,M. Agnello,N. Agrawal, Z. Ahammed,S. U. Ahn,S. Aiola,A. Akindinov,S. N. Alam,D. Aleksandrov, B. Alessandro,D. Alexandre,R. Alfaro Molina,A. Alici,A. Alkin, J. R M Almaraz, J. Alme,T. Alt,S. Altinpinar,I. Altsybeev,C. Alves Garcia Prado,C. Andrei, A. Andronic, V. Anguelov, J. Anielski, T. Antičić, F. Antinori,P. Antonioli,L. Aphecetche,H. Appelshäuser, S. Arcelli,R. Arnaldi,O. W. Arnold,I. C. Arsene, M. Arslandok, B. Audurier,A. Augustinus,R. Averbeck,T. C. Awes,M. D. Azmi,A. Badalà,Y. W. Baek,S. Bagnasco, R. Bailhache,R. Bala, A. Baldisseri,R. C. Baral, A. M. Barbano,R. Barbera,F. Barile,G. G. Barnaföldi, L. S. Barnby, V. Barret,P. Bartalini,K. Barth, J. Bartke,E. Bartsch,M. Basile, N. Bastid,S. Basu,B. Bathen,G. Batigne,A. Batista Camejo,B. Batyunya,P. C. Batzing,I. G. Bearden,H. Beck,C. Bedda,N. K. Behera, I. Belikov,F. Bellini,H. Bello Martinez,R. Bellwied,R. Belmont,E. Belmont-Moreno,V. Belyaev,G. Bencedi,S. Beole, I. Berceanu,A. Bercuci,Y. Berdnikov,D. Berenyi,R. A. Bertens,D. Berzano,L. Betev,A. Bhasin,I. R. Bhat,A. K. Bhati,B. Bhattacharjee,J. Bhom,L. Bianchi,N. Bianchi,C. Bianchin, J. Bielčík, J. Bielčíková,A. Bilandzic,R. Biswas,S. Biswas, S. Bjelogrlic,J. T. Blair,D. Blau, C. Blume,F. Bock,A. Bogdanov,H. Bøggild, L. Boldizsár,M. Bombara, J. Book,H. Borel,A. Borissov, M. Borri, F. Bossú,E. Botta, S. Böttger,C. Bourjau, P. Braun-Munzinger,M. Bregant,T. Breitner,T. A. Broker,T. A. Browning,M. Broz,E. J. Brucken,E. Bruna,G. E. Bruno, D. Budnikov, H. Buesching, S. Bufalino, P. Buncic, O. Busch,Z. Buthelezi,J. B. Butt,J. T. Buxton, D. Caffarri,X. Cai,H. Caines,L. Calero Diaz,A. Caliva,E. Calvo Villar,P. Camerini,F. Carena,W. Carena,F. Carnesecchi,J. Castillo Castellanos,A. J. Castro,E. A R Casula,C. Ceballos Sanchez,J. Cepila,P. Cerello, J. Cerkala,B. Chang,S. Chapeland,M. Chartier,J. L. Charvet,S. Chattopadhyay, V. Chelnokov,M. Cherney, C. Cheshkov,B. Cheynis,V. Chibante Barroso,D. D. 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PHYSICS LETTERS B（2016）
引用 218|浏览9
摘要
Direct photon production at mid-rapidity in Pb-Pb collisions at root s(NN) = 2.76 TeV was studied in the transverse momentum range 0.9 < p(T) < 14 GeV/c. Photons were detected with the highly segmented electromagnetic calorimeter PHOS and via conversions in the ALICE detector material with the e(+)e(-) pair reconstructed in the central tracking system. The results of the two methods were combined and direct photon spectra were measured for the 0-20%, 20-40%, and 40-80% centrality classes. For all three classes, agreement was found with perturbative QCD calculations for p(T) greater than or similar to 5 GeV/c. Direct photon spectra down to p(T) approximate to 1 GeV/c could be extracted for the 20-40% and 0-20% centrality classes. The significance of the direct photon signal for 0.9 < p(T) < 2.1 GeV/c is 2.6 sigma for the 0-20% class. The spectrum in this p(T) range and centrality class can be described by an exponential with an inverse slope parameter of (297 +/- 12(stat) +/- 41(syst)) MeV. State-of-the-art models for photon production in heavy-ion collisions agree with the data within uncertainties. (C) 2016 CERN for the benefit of the ALICE Collaboration. Published by Elsevier B.V.
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