Direct photon production at LHCb

Boettcher, T; Bediaga, I; Cruz Torres, M; De Miranda, Jm; dos Reis, Ac; Gomes, A; Massafferri, A; Molina Rodriguez, J; Soares Lavra, L; Tourinho Jadallah Aoude, R; Amato, S; Carvalho Akiba, K; Da Cunha Marinho, F; De Paula, L; Ferreira Rodrigues, E; Gandelman, M; Hicheur, A; Lopes, Jh; Nasteva, I; Otalora Goicochea, Jm; Polycarpo, E; Potterat, C; Rangel, Ms; Silva de Oliveira, L; Souza De Paula, B; An, L; Chen, C; Davis, A; Gan, Y; Gao, Y; Gu, C; Jiang, F; Li, T; Liu, X; Ren, Z; Sun, J; Tang, Z; Wang, M; Xu, A; Xu, Z; Yang, Z; Zhang, L; Zhang, Wc; Zhu, X; Chefdeville, M; Decamp, D; Ghez, P; Marchand, Jf; Minard, M; Pietrzyk, B; Reboud, M; T'Jampens, S; Tournefier, E; Ajaltouni, Z; Cogneras, E; Deschamps, O; Gazzoni, G; Hadjivasiliou, C; Kozeiha, M; Lefevre, R; Maratas, J; Monteil, S; Perret, P; Quintana, B; Tisserand, V; Vernet, M; Romeu, Ja; Aslanides, E; Cogan, J; Gerstel, D; Le Gac, R; Leroy, O; Mancinelli, G; Martin, M; Meaux, C; Morris, Ab; Serrano, J; Tayduganov, A; Tsaregorodtsev, A; Amhis, Y; Balagura, V; Barsuk, S; Bossu, F; Chamont, D; Coelho, Jab; Desse, F; Fleuret, F; Lefrancois, J; Lisovskyi, V; Machefert, F; Benito, Cm; Maurice, E; Renaudin, V; Robbe, P; Schune, Mh; Stocchi, A; Usachov, A; Winn, M; Wormser, G; Zhang, Y; Ben-Haim, E; Bertholet, E; Billoir, P; Charles, M; Del Buono, L; Dujany, G; Gligorov, Vv; Mogini, A; Polci, F; Quagliani, R; Reiss, F; Robert, A; Sepulveda, Es; Tou, Dy; Beranek, S; Boubdir, M; Escher, S; Kim, T; Langenbruch, C; Materok, M; Nieswand, S; Schael, S; Smith, E; Verlage, Ta; Whitehead, M; Zhukov, V; Albrecht, J; Birnkraut, A; Demmer, M; Eitschberger, U; Ekelhof, R; Gavardi, L; Heinicke, K; Heister, A; Ibis, P; Mackowiak, P; Meier, F; Moedden, A; Mombaecher, T; Mueller, J; Mueller, V; Niet, R; Reichert, S; Schellenberg, M; Schmelzer, T; Seuthe, A; Spaan, B; Stevens, H; Tekampe, T; Wishahi, J; Dembinski, H; Klimkovich, T; Schmelling, M; Zavertyaev, M; Bachmann, S; Berninghoff, D; Braun, S; Comerma-Montells, A; D'Argent, P; Dziewiecki, M; Gerick, D; Grabowski, Jp; Han, X; Hansmann-Menzemer, S; Kecke, M; Khanji, B; Kolpin, M; Kopecna, R; Leverington, B; Marks, J; Mitzel, Ds; Neubert, S; Neuner, M; Piucci, A; Skidmore, N; Stahl, M; Stemmle, S; Uwer, U; Zhelezov, A; Mcnulty, R; Veronika, Nv; De Serio, M; Fini, Ra; Palano, A; Pastore, A; Simone, S; Betti, F; Carbone, A; Falabella, A; Ferrari, F; Galli, D; Marconi, U; O'Hanlon, Dp; Patrignani, C; Soares, M; Vagnoni, V; Valenti, G; Zucchelli, S; Andreotti, M; Baldini, W; Bozzi, C; Calabrese, R; Corvo, M; Fiorini, M; Luppi, E; Minzoni, L; Pappalardo, Ll; Siddi, Bg; Tellarini, G; Tomassetti, L; Vecchi, S; Anderlini, L; Bizzeti, A; Graziani, G; Passaleva, G; Veltri, M; Albicocco, P; Bencivenni, G; Campana, P; Ciambrone, P; De Simone, P; Di Nezza, P; Klaver, S; Lanfranchi, G; Morello, G; Ogilvy, S; Palutan, M; Lener, Mp; Rotondo, M; Santimaria, M; Sarti, A; Sciascia, B; Cardinale, R; Cavallero, G; Fontanelli, F; Petrolini, A; Belloli, N; Calvi, M; Carniti, P; Cassina, L; Fazzini, D; Gotti, C; Matteuzzi, C; Fu, J; Gandini, P; Marangotto, D; Merli, A; Neri, N; Petruzzo, M; Audurier, B; Brundu, D; Cadeddu, S; Cardini, A; Chen, S; Contu, A; Fontana, M; Griffith, P; Lai, A; Loi, A; Manca, G; Oldeman, R; Saitta, B; Amerio, S; Bertolin, A; Gallorini, S; Lucchesi, D; Lupato, A; Michielin, E; Morandin, M; Sestini, L; Simi, G; Bedeschi, F; Cenci, R; Lusiani, A; Morello, Mj; Pajero, T; Punzi, G; Rama, M; Stracka, S; Tonelli, D; Tuci, G; Walsh, J; Carboni, G; Federici, L; Santovetti, E; Satta, A; Bocci, V; Martellotti, G; Penso, G; Pinci, D; Santacesaria, R; Satriano, C; Sciubba, A; Aaij, R; Ali, S; Archilli, F; Bel, Lj; Benson, S; Dall'Occo, E; de Vries, Ja; Dufour, L; Esen, S; Carvalho, Mfpr; Govorkova, E; Greim, R; Hulsbergen, W; Hynds, D; Jans, E; Koppenburg, P; Kostiuk, I; Merk, M; Mulder, M; Pellegrino, A; Gras, Cs; Tuning, N; van Beuzekom, M; van Tilburg, J; van Veghel, M; Sierra, Cv; Veronesi, M; Vitkovskiy, A; Ketel, T; Raven, G; Syropoulos, V; Bhom, J; Brodzicka, J; Dziurda, A; Kucewicz, W; Kucharczyk, M; Lesiak, T; Malecki, B; Ossowska, A; Pikies, M; Witek, M; Dendek, A; Firlej, M; Fiutowski, T; Idzik, M; Krupa, W; Majewski, Mw; Moron, J; Oblakowska-Mucha, A; Rachwal, B; Swientek, K; Szumlak, T; Tobin, M; Batozskaya, V; Klimaszewski, K; Krzemien, W; Melnychuk, D; Ukleja, A; Wislicki, W; Cojocariu, L; Ene, A; Giubega, L; Grecu, A; Maciuc, F; Placinta, V; Straticiuc, M; Alkhazov, G; Bondar, N; Chubykin, A; Dzyuba, A; Ivshin, K; Kotriakhova, S; Maev, O; Maisuzenko, D; Sagidova, N; Shcheglov, Y; Stepanova, M; Vorobyev, A; Belyaev, I; Danilina, A; Egorychev, V; Golubkov, D; Kvaratskheliya, T; Pereima, D; Savrina, D; Semennikov, A; Berezhnoy, A; Gorelov, I; V,; Leflat, A; Nikitin, N; Volkov, V; Filippov, S; Gushchin, E; Kravchuk, L; Arzymatov, K; Baranov, A; Borisyak, M; Chekalina, V; Derkach, D; Hushchyn, M; Kazeev, N; Khairullin, E; Ratnikov, F; Rogozhnikov, A; Ustyuzhanin, A; Bondar, A; Eidelman, S; Krokovny, P; Kudryavtsev, V; Maltsev, T; Shekhtman, L; Vorobyev, V; Artamonov, A; Belous, K; Dzhelyadin, R; Guz, Y; Obraztsov, V; Popov, A; Poslavskii, S; Romanovskiy, V; Shapkin, M; Stenyakin, O; Yushchenko, O; Alfonso Albero, A; Calvo Gomez, M; Camboni, A; Coquereau, S; Garrido, L; Gascon, D; Graciani Diaz, R; Grauges, E; Vilasis-Cardona, X; Adeva, B; Alves Jr, Aa; Boente Garcia, O; Borsato, M; Chobanova, V; Cid Vidal, X; Dosil Suarez, A; Fernandez Prieto, A; Gallas Torreira, A; Garcia Plana, B; Lucio Martinez, M; Martinez Santos, D; Plo Casasus, M; Prisciandaro, J; Ramos Pernas, M; Romero Vidal, A; Saborido Silva, Jj; Sanmartin Sedes, B; Santamarina Rios, C; Vazquez Regueiro, P; Vieites Diaz, M; Alessio, F; Blago, Mp; Brodski, M; Buytaert, J; Byczynski, W; Perez, Dhc; Cattaneo, M; Charpentier, P; Chitic, S; Chrzaszcz, M; Ciezarek, G; Clemencic, M; Closier, J; Coco, V; Collins, P; Colombo, T; Coombs, G; Corti, G; Couturier, B; D'Ambrosio, C; Francisco, Oda; De Bruyn, K; Di Canto, A; Dijkstra, H; Dordei, F; Dorigo, M; Durante, P; Farber, C; Declara, Pf; Ferro-Luzzi, M; Forty, R; Frank, M; Frei, C; Funk, W; Gaspar, C; Cardoso, Lag; Gruber, L; Gys, T; Haen, C; Hasse, C; Hatch, M; Jacobsson, R; Johnson, D; Joram, C; Jost, B; Karacson, M; Lacarrere, D; Lemaitre, F; Lindner, R; Lupton, O; Martinelli, M; Matev, R; Mathe, Z; Mueller, D; Neufeld, N; Nolte, Ns; Pearce, A; Altarelli, Mp; Perazzini, S; Pinzino, J; Pisani, F; Ponce, S; Salzgeber, Mr; Roehrken, M; Roiser, S; Ruf, T; Schindler, H; Schmidt, B; Schopper, A; Schwemmer, R; Seyfert, P; Stagni, F; Stahl, S; Teubert, F; Thomas, E; Tolk, S; Valassi, A; Valat, S; van Herwijnen, E; Gomez, Rv; Barbosa, Jvv; Voneki, B; Wyllie, K; Andreassi, G; Battista, V; Bay, A; Bellee, V; Blanc, F; De Cian, M; Lopes, Lf; Fitzpatrick, C; Giani, S; Girard, Og; Haefeli, G; Hopchev, Ph; Khurewathanakul, C; Kuonen, Ak; Macko, V; Marinangeli, M; Marino, P; Maurin, B; Nakada, T; Nanut, T; Nguyen, Td; Nguyen-Mau, C; Pais, Pr; Pescatore, L; Pietrzyk, G; Redi, F; Rodrigues, Ab; Schneider, O; Schubiger, M; Stefko, P; Stramaglia, Me; Tran, Mt; Atzeni, M; Bernet, R; Betancourt, C; Bershyiko, I; Buonaura, A; Pardinas, Jg; Graverini, E; Lancierini, D; Lionetto, F; Mauri, A; Mueller, K; Owen, P; Navarro, Ap; Serra, N; Coutinho, Rs; Steinkamp, O; Storaci, B; Straumann, U; Vollhardt, A; Wang, Z; Weiden, A; Dovbnya, A; Kandybei, S; Koliiev, S; Pugatch, V; Bifani, S; Calladine, R; Chatzikonstantinidis, G; Farley, N; Ilten, P; Lazzeroni, C; Mazurov, A; Plews, J; Popov, D; Sergi, A; Watson, Nk; Williams, T; Zarebski, Ka; Adinolfi, M; Bhasin, S; Buchanan, E; Chapman, Mg; Dalseno, J; Harnew, St; Kariuki, Jm; Maddrell-Mander, S; Naik, P; Petridis, K; Pomery, Gj; Price, E; Prouve, C; Rademacker, Jh; Richards, S; Velthuis, Jj; Bettler, Mo; Cliff, H; V,; Delaney, B; Tico, Jg; Gibson, V; Haines, Sc; Jones, Cr; Keizer, F; Kenzie, M; Lovell, Gh; Smeaton, Jg; Trisovic, A; Tully, A; Vitti, M; Ward, Dr; Williams, I; Wotton, Sa; Back, Jj; Blake, T; Gonzalo, Ab; Sobral, Cmc; Crocombe, A; Gershon, T; Kreps, M; Latham, T; Loh, D; Mathad, A; Millard, E; Poluektov, A; Wicht, J; Easo, S; Nandakumar, R; Papanestis, A; Ricciardi, S; Wilson, Ff; Carson, L; Clarke, Pel; Cowan, Ga; Currie, R; Eisenhardt, S; Gabriel, E; Gambetta, S; Gizdov, K; Muheim, F; Needham, M; Pappagallo, M; Petrucci, S; Playfer, S; Smith, It; Zonneveld, Jb; Alexander, M; Beddow, J; Bobulska, D; Dean, Ct; Douglas, L; Eklund, L; Karodia, S; Longstaff, I; Schiller, M; Soler, Fjp; Spradlin, P; Traill, M; Bowcock, Tj; V,; Casse, G; Dettori, F; Dreimanis, K; Farry, S; Lima, Vf; Harrison, T; Hennessy, K; Hutchcroft, D; Marshall, Pj; Mead, J; V,; Rinnert, K; Shears, T; Wark, Hm; Yeomans, Le; Cartelle, Pa; Baker, S; Egede, U; Golutvin, A; Hecker, M; Humair, T; Kress, F; Mccann, M; Patel, M; Smith, M; Stefkova, S; Tilley, Mj; Websdale, D; Appleby, Rb; Barlow, Rj; Barter, W; Borghi, S; Burr, C; Capriotti, L; De Capua, S; Dutta, D; Gersabeck, E; Gersabeck, M; Grillo, L; Charman, Rh; Hilton, M; Lafferty, G; Maguire, K; Mcnab, A; Murray, D; Parkes, C; Sarpis, G; Williams, Mrj; Bjorn, M; Cazon, Brg; Hadavizadeh, T; Hancock, Th; Harnew, N; Hill, D; Jalocha, J; John, M; Jurik, N; Malde, S; Murphy, Ch; Nandi, A; Pili, M; Pullen, H; Rollings, A; Veneziano, G; Vesterinen, M; Wilkinson, G; Boettcher, T; Craik, Dc; Weisser, C; Williams, M; Akar, S; Evans, T; Huard, Zc; Meadows, B; Rodrigues, E; Schreiner, Hf; Sokoloff, Md; Andrews, Je; Hamilton, B; Jawahery, A; Parker, W; Wimberley, J; Artuso, M; Batsukh, B; Beiter, A; Blusk, S; Ely, S; Kelsey, M; Kim, Ke; Li, Z; Liang, X; Mountain, R; Polyakov, I; Rudolph, Ms; Skwarnicki, T; Stone, S; Venkateswaran, A; Wang, J; Wilkinson, M; Yao, Y; Yuan, X; Gobel, C; Salustino Guimaraes, V; Beliy, N; He, J; Huang, W; P-R, L; Lyu, X; Qian, W; Qin, J; Saur, M; Szymanski, M; Vieira, D; Xu, Q; Zheng, Y; Cai, H; Sun, L; Dey, B; Hu, W; Wang, Y; Xiao, D; Xie, Y; Xu, M; Yin, H; Yu, J; Zhang, D; Milanes, Da; Monroy, Ia; Rodriguez Lopez, Ja; Gruenberg, O; Hess, M; Meinert, N; Viemann, H; Waldi, R; Onderwater, Cjg; Likhomanenko, T; Malinin, A; Morgunova, O; Nogay, A; Petrov, A; Shevchenko, V; Baryshnikov, F; Didenko, S; Polukhina, N; Shmanin, E; Panshin, G; Strokov, S; Vagner, A; Garcia Martin, Lm; Henry, L; Martinez Vidal, F; Oyanguren, A; Remon Alepuz, C; Ruiz Vidal, J; Sanchez Mayordomo, C; Aidala, Ca; Da Silva, Cl; Durham, Jm

doi:10.1016/j.nuclphysa.2018.10.046

At small Bjorken-x, the large gluon number density in the nucleon leads to gluon recombination competing with gluon splitting, which could result in saturation of the gluon PDF. This gluon saturation has yet to be conclusively observed. Direct photon production provides sensitivity to gluon densities in protons and nuclei, and the forward acceptance of LHCb detector allows for measurements of this process at low Bjorken-x, providing an ideal probe of saturation effects. Progress towards the measurement of forward direct photon production using the LHCb detector is presented.

Boettcher, T., Bediaga, I., Cruz Torres, M., De Miranda, J.m., dos Reis, A.c., Gomes, A., et al. (2019). Direct photon production at LHCb. NUCLEAR PHYSICS. A, 982, 251-254 [10.1016/j.nuclphysa.2018.10.046].