The production of isolated photons in PbPb and pp collisions at √sNN = 5.02 TeV

Sirunyan, AM; Tumasyan, A; Adam, W; Ambrogi, F; Bergauer, T; Dragicevic, M; Erö, J; Escalante Del Valle, A; Flechl, M; Frühwirth, R; Jeitler, M; Krammer, N; Krätschmer, I; Liko, D; Madlener, T; Mikulec, I; Rad, N; Schieck, J; Schöfbeck, R; Spanring, M; Waltenberger, W; Wulz, CE; Zarucki, M; Drugakov, V; Mossolov, V; Suarez Gonzalez, J; Darwish, MR; De Wolf, EA; Di Croce, D; Janssen, X; Kello, T; Lelek, A; Pieters, M; Rejeb Sfar, H; Van Haevermaet, H; Van Mechelen, P; Van Putte, S; Van Remortel, N; Blekman, F; Bols, ES; Chhibra, SS; D’Hondt, J; De Clercq, J; Lontkovskyi, D; Lowette, S; Marchesini, I; Moortgat, S; Python, Q; Tavernier, S; Van Doninck, W; Van Mulders, P; Beghin, D; Bilin, B; Clerbaux, B; De Lentdecker, G; Delannoy, H; Dorney, B; Favart, L; Grebenyuk, A; Kalsi, AK; Moureaux, L; Popov, A; Postiau, N; Starling, E; Thomas, L; Vander Velde, C; Vanlaer, P; Vannerom, D; Cornelis, T; Dobur, D; Khvastunov, I; Niedziela, M; Roskas, C; Skovpen, K; Tytgat, M; Verbeke, W; Vermassen, B; Vit, M; Bruno, G; Caputo, C; David, P; Delaere, C; Delcourt, M; Giammanco, A; Lemaitre, V; Prisciandaro, J; Saggio, A; Vischia, P; Zobec, J; Alves, GA; Correia Silva, G; Hensel, C; Moraes, A; Belchior Batista Das Chagas, E; Carvalho, W; Chinellato, J; Coelho, E; Da Costa, EM; Da Silveira, GG; De Jesus Damiao, D

Please use this identifier to cite or link to this item: http://bura.brunel.ac.uk/handle/2438/21330

Title:	The production of isolated photons in PbPb and pp collisions at √sNN = 5.02 TeV
Authors:	Sirunyan, AM Tumasyan, A Adam, W Ambrogi, F Bergauer, T Dragicevic, M Erö, J Escalante Del Valle, A Flechl, M Frühwirth, R Jeitler, M Krammer, N Krätschmer, I Liko, D Madlener, T Mikulec, I Rad, N Schieck, J Schöfbeck, R Spanring, M Waltenberger, W Wulz, CE Zarucki, M Drugakov, V Mossolov, V Suarez Gonzalez, J Darwish, MR De Wolf, EA Di Croce, D Janssen, X Kello, T Lelek, A Pieters, M Rejeb Sfar, H Van Haevermaet, H Van Mechelen, P Van Putte, S Van Remortel, N Blekman, F Bols, ES Chhibra, SS D’Hondt, J De Clercq, J Lontkovskyi, D Lowette, S Marchesini, I Moortgat, S Python, Q Tavernier, S Van Doninck, W Van Mulders, P Beghin, D Bilin, B Clerbaux, B De Lentdecker, G Delannoy, H Dorney, B Favart, L Grebenyuk, A Kalsi, AK Moureaux, L Popov, A Postiau, N Starling, E Thomas, L Vander Velde, C Vanlaer, P Vannerom, D Cornelis, T Dobur, D Khvastunov, I Niedziela, M Roskas, C Skovpen, K Tytgat, M Verbeke, W Vermassen, B Vit, M Bruno, G Caputo, C David, P Delaere, C Delcourt, M Giammanco, A Lemaitre, V Prisciandaro, J Saggio, A Vischia, P Zobec, J Alves, GA Correia Silva, G Hensel, C Moraes, A Belchior Batista Das Chagas, E Carvalho, W Chinellato, J Coelho, E Da Costa, EM Da Silveira, GG De Jesus Damiao, D
Keywords:	Hadron-Hadron scattering (experiments);Heavy-ion collision;Photon production
Issue Date:	17-Jul-2020
Publisher:	Springer Verlag
Citation:	Journal of High Energy Physics, 2020, 2020 (7)
Abstract:	© 2020, The Author(s). The transverse energy (ETγ) spectra of photons isolated from other particles are measured using proton-proton (pp) and lead-lead (PbPb) collisions at the LHC at sNN = 5.02 TeV with integrated luminosities of 27.4 pb−1 and 404 μb−1 for pp and PbPb data, respectively. The results are presented for photons with 25 <ETγ< 200 GeV in the pseudorapidity range \|η\| < 1.44, and for different centrality intervals for PbPb collisions. Photon production in PbPb collisions is consistent with that in pp collisions scaled by the number of binary nucleon-nucleon collisions, demonstrating that photons do not interact with the quark-gluon plasma. Therefore, isolated photons can provide information about the initial energy of the associated parton in photon+jet measurements. The results are compared with predictions from the next-to-leading-order jetphox generator for different parton distribution functions (PDFs) and nuclear PDFs (nPDFs). The comparisons can help to constrain the nPDFs global fits. [Figure not available: see fulltext.]
URI:	http://bura.brunel.ac.uk/handle/2438/21330
DOI:	http://dx.doi.org/10.1007/JHEP07(2020)116
ISSN:	1126-6708
Appears in Collections:	Dept of Electronic and Electrical Engineering Research Papers

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