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Acharya, S, Collaboration, ALICE, Acosta, FT, Adamova, D, Adolfsson, J, Aggarwal, MM, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z et al (show 1007 more authors) , Ahn, SU, Aiola, S, Akindinov, A, Al-Turany, M, Alam, SN, Albuquerque, DSD, Aleksandrov, D, Alessandro, B, Alfaro Molina, R, Ali, Y, Alici, A, Alkin, A, Alme, J, Alt, T, Altenkamper, L, Altsybeev, I, Anaam, MN, Andrei, C, Andreou, D, Andrews, HA, Andronic, A, Angeletti, M, Anguelov, V, Anson, C, Anticic, T, Antinori, F, Antonioli, P, Anwar, R, Apadula, N, Aphecetche, L, Appelshaeuser, H, Arcelli, S, Arnaldi, R, Arnold, OW, Arsene, IC, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, MD, Badala, A, Baek, YW, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, Ball, M, Baral, RC, Barbano, AM, Barbera, R, Barile, F, Barioglio, L, Barnafoldi, GG, Barnby, LS, Barret, V, Bartalini, P, Barth, K, Bartsch, E, Bastid, N, Basu, S, Batigne, G, Batyunya, B, Batzing, PC, Bazo Alba, JL, Bearden, IG, Beck, H, Bedda, C, Behera, NK, Belikov, I, Bellini, F, Bello Martinez, H, Bellwied, R, Beltran, LGE, Belyaev, V, Bencedi, G, Beole, S, Bercuci, A, Berdnikov, Y, Berenyi, D, Bertens, RA, Berzano, D, Betev, L, Bhaduri, PP, Bhasin, A, Bhat, IR, Bhatt, H, Bhattacharjee, B, Bhom, J, Bianchi, A, Bianchi, L, Bianchi, N, Bielcik, J, Bielcikova, J, Bilandzic, A, Biro, G, Biswas, R, Biswas, S, Blair, JT, Blau, D, Blume, C, Boca, G, Bock, F, Bogdanov, A, Boldizsar, L, Bombara, M, Bonomi, G, Bonora, M, Borel, H, Borissov, A, Borri, M, Botta, E, Bourjau, C, Bratrud, L, Braun-Munzinger, P, Bregant, M, Broker, TA, Broz, M, Brucken, EJ, Bruna, E, Bruno, GE, Budnikov, D, Buesching, H, Bufalino, S, Buhler, P, Buncic, P, Busch, O, Buthelezi, Z, Butt, JB, Buxton, JT, Cabala, J, Caffarri, D, Caines, H, Caliva, A, Calvo Villar, E, Camacho, RS, Camerini, P, Capon, AA, Carena, F, Carena, W, Carnesecchi, F, Castillo Castellanos, J, Castro, AJ, Casula, EAR, Ceballos Sanchez, C, Chandra, S, Chang, B, Chang, W, Chapeland, S, Chartier, M 
ORCID: 0000-0003-0578-5567, Chattopadhyay, S, Chattopadhyay, S, Chauvin, A, Cheshkov, C, Cheynis, B, Barroso, V Chibante, Chinellato, DD, Cho, S, Chochula, P, Chowdhury, T, Christakoglou, P, Christensen, CH, Christiansen, P, Chujo, T, Chung, SU, Cicalo, C, Cifarelli, L, Cindolo, F, Cleymans, J, Colamaria, F, Colella, D, Collu, A, Colocci, M, Concas, M, Balbastre, G Conesa, Del Valle, Z Conesa, Contreras, JG, Cormier, TM, Morales, Y Corrales, Cortese, P, Cosentino, MR, Costa, F, Costanza, S, Crkovska, J, Crochet, P, Cuautle, E, Cunqueiro, L, Dahms, T, Dainese, A, Dani, S, Danisch, MC, Danu, A, Das, D, Das, I, Das, S, Dash, A, Dash, S, De, S, De Caro, A, de Cataldo, G, de Conti, C, de Cuveland, J, De Falco, A, De Gruttola, D, De Marco, N, De Pasquale, S, De Souza, RD, Degenhardt, HF, Deisting, A, Deloff, A, Delsanto, S, Deplano, C, Dhankher, P, Di Bari, D, Di Mauro, A, Di Ruzza, B, Diaz, RA, Dietel, T, Dillenseger, P, Ding, Y, Divia, R, Djuvsland, O, Dobrin, A, Gimenez, D Domenicis, Doenigus, B, Dordic, O, Doremalen, LVR, Dubey, AK, Dubla, A, Ducroux, L, Dudi, S, Duggal, AK, Dukhishyam, M, Dupieux, P, Ehlers, RJ, Elia, D, Endress, E, Engel, H, Epple, E, Erazmus, B, Erhardt, F, Ersdal, MR, Espagnon, B, Eulisse, G, Eum, J, Evans, D, Evdokimov, S, Fabbietti, L, Faggin, M, Faivre, J, Fantoni, A, Fasel, M, Feldkamp, L, Feliciello, A, Feofilov, G, Fernandez Tellez, A, Ferretti, A, Festanti, A, Feuillard, VJG, Figiel, J, Figueredo, MAS, Filchagin, S, Finogeev, D, Fionda, FM, Fiorenza, G, Flor, F, Floris, M, Foertsch, S, Foka, P, Fokin, S, Fragiacomo, E, Francescon, A, Francisco, A, Frankenfeld, U, Fronze, GG, Fuchs, U, Furget, C, Furs, A, Girard, M Fusco, Gaardhoje, JJ, Gagliardi, M, Gago, AM, Gajdosova, K, Gallio, M, Galvan, CD, Ganoti, P, Garabatos, C, Garcia-Solis, E, Garg, K, Gargiulo, C, Gasik, P, Gauger, EF, Gay Ducati, MB, Germain, M, Ghosh, J, Ghosh, P, Ghosh, SK, Gianotti, P, Giubellino, P, Giubilato, P, Glaessel, P, Gomez Coral, DM, Ramirez, A Gomez, Gonzalez, V, Gonzalez-Zamora, P, Gorbunov, S, Gorlich, L, Gotovac, S, Grabski, V, Graczykowski, LK, Graham, KL, Greiner, L, Grelli, A, Grigoras, C, Grigoriev, V, Grigoryan, A, Grigoryan, S, Gronefeld, JM, Grosa, F, Grosse-Oetringhaus, JF, Grosso, R, Guernane, R, Guerzoni, B, Guittiere, M, Gulbrandsen, K, Gunji, T, Gupta, A, Gupta, R, Guzman, IB, Haake, R, Habib, MK, Hadjidakis, C, Hamagaki, H, Hamar, G, Hamid, M, Hamon, JC, Hannigan, R, Haque, MR, Harris, JW, Harton, A, Hassan, H, Hatzifotiadou, D, Hayashi, S, Heckel, ST, Hellbaer, E, Helstrup, H, Herghelegiu, A, Hernandez, EG, Herrera Corral, G, Herrmann, F, Hetland, KF, Hilden, TE, Hillemanns, H, Hills, C, Hippolyte, B, Hohlweger, B, Horak, D, Hornung, S, Hosokawa, R, Hota, J, Hristov, P, Huang, C, Hughes, C, Huhn, P, Humanic, TJ, Hushnud, H, Hussain, N, Hussain, T, Hutter, D, Hwang, DS, Iddon, JP ORCID: 0000-0002-2851-5554, Buitron, SA Iga, Ilkaev, R, Inaba, M, Ippolitov, M, Islam, MS, Ivanov, M, Ivanov, V, Izucheev, V, Jacak, B, Jacazio, N, Jacobs, PM, Jadhav, MB, Jadlovska, S, Jadlovsky, J, Jaelani, S, Jahnke, C, Jakubowska, MJ, Janik, MA, Jena, C, Jercic, M, Jevons, O, Bustamante, RT Jimenez, Jin, M, Jones, PG, Jusko, A, Kalinak, P, Kalweit, A, Kang, JH, Kaplin, V, Kar, S, Uysal, A Karasu, Karavichev, O, Karavicheva, T, Karczmarczyk, P, Karpechev, E, Kebschull, U, Keidel, R, Keijdener, DLD, Keil, M, Ketzer, B, Khabanova, Z, Khan, AM, Khan, S, Khan, SA, Khanzadeev, A, Kharlov, Y, Khatun, A, Khuntia, A, Kielbowicz, MM, Kileng, B, Kim, B, Kim, D, Kim, DJ, Kim, EJ, Kim, H, Kim, JS, Kim, J, Kim, M, Kim, S, Kim, T, Kim, T, Kirsch, S, Kisel, I, Kiselev, S, Kisiel, A, Klay, JL, Klein, C, Klein, J, Klein-Boesing, C, Klewin, S, Kluge, A, Knichel, ML, Knospe, AG, Kobdaj, C, Kofarago, M, Koehler, MK, Kollegger, T, Kondratyeva, N, Kondratyuk, E, Konevskikh, A, Konyushikhin, M, Kovalenko, O, Kovalenko, V, Kowalski, M, Kralik, I, Kravcakova, A, Kreis, L, Krivda, M, Krizek, F, Krueger, M, Kryshen, E, Krzewicki, M, Kubera, AM, Kucera, V, Kuhn, C, Kuijer, PG, Kumar, J, Kumar, L, Kumar, S, Kundu, S, Kurashvili, P, Kurepin, A, Kurepin, AB, Kuryakin, A, Kushpil, S, Kvapil, J, Kweon, MJ, Kwon, Y, La Pointe, SL, La Rocca, P, Lai, YS, Lakomov, I, Langoy, R, Lapidus, K, Lara, C, Lardeux, A, Larionov, P, Laudi, E, Lavicka, R, Lea, R, Leardini, L, Lee, S, Lehas, F, Lehner, S, Lehrbach, J, Lemmon, RC, Leon Monzon, I, Levai, P, Li, X, Li, XL, Lien, J, Lietava, R, Lim, B, Lindal, S, Lindenstruth, V, Lindsay, SW, Lippmann, C, Lisa, MA, Litichevskyi, V, Liu, A, Ljunggren, HM, Llope, WJ, Lodato, DF, Loginov, V, Loizides, C, Loncar, P, Lopez, X, Lopez Torres, E, Lowe, A, Luettig, P, Luhder, JR, Lunardon, M, Luparello, G, Lupi, M, Maevskaya, A, Mager, M, Mahmood, SM, Maire, A, Majka, RD, Malaev, M, Malik, QW, Malinina, L, Mal'Kevich, D, Malzacher, P, Mamonov, A, Manko, V, Manso, F, Manzari, V, Mao, Y, Marchisone, M, Mares, J, Margagliotti, GV, Margotti, A, Margutti, J, Marin, A, Markert, C, Marquard, M, Martin, NA, Martinengo, P, Martinez, JL, Martinez, MI, Martinez Garcia, G, Pedreira, M Martinez, Masciocchi, S, Masera, M, Masoni, A, Massacrier, L, Masson, E, Mastroserio, A, Mathis, AM, Matuoka, PFT, Matyja, A, Mayer, C, Mazzilli, M, Mazzoni, MA, Meddi, F, Melikyan, Y, Menchaca-Rocha, A, Meninno, E, Mercado Perez, J, Meres, M, Meza, CS, Mhlanga, S, Miake, Y, Micheletti, L, Mieskolainen, MM, Mihaylov, DL, Mikhaylov, K, Mischke, A, Mishra, AN, Miskowiec, D, Mitra, J, Mitu, CM, Mohammadi, N, Mohanty, AP, Mohanty, B, Khan, M Mohisin, De Godoy, DA Moreira, Moreno, LAP, Moretto, S, Morreale, A, Morsch, A, Muccifora, V, Mudnic, E, Muehlheim, D, Muhuri, S, Mukherjee, M, Mulligan, JD, Munhoz, MG, Muenning, K, Munoz, MIA, Munzer, RH, Murakami, H, Murray, S, Musa, L, Musinsky, J, Myers, CJ, Myrcha, JW, Naik, B, Nair, R, Nandi, BK, Nania, R, Nappi, E, Narayan, A, Naru, MU, Nassirpour, AF, Natal da Luz, H, Nattrass, C, Navarro, SR, Nayak, K, Nayak, R, Nayak, TK, Nazarenko, S, De Oliveira, RA Negrao, Nellen, L, Nesbo, SV, Neskovic, G, Ng, F, Nicassio, M, Niedziela, J, Nielsen, BS, Nikolaev, S, Nikulin, S, Nikulin, V, Noferini, F, Nomokonov, P, Nooren, G, Noris, JCC, Norman, J ORCID: 0000-0002-3783-5760, Nyanin, A, Nystrand, J, Oh, H, Ohlson, A, Oleniacz, J, Oliveira Da Silva, AC, Oliver, MH, Onderwaater, J, Oppedisano, C, Orava, R, Oravec, M, Ortiz Velasquez, A, Oskarsson, A, Otwinowski, J, Oyama, K, Pachmayer, Y, Pacik, V, Pagano, D, Paic, G, Palni, P, Pan, J, Pandey, AK, Panebianco, S, Papikyan, V, Pareek, P, Park, J, Parkkila, JE, Parmar, S, Passfeld, A, Pathak, SP, Patra, RN, Paul, B, Pei, H, Peitzmann, T, Peng, X, Pereira, LG, Da Costa, H Pereira, Peresunko, D, Lezama, E Perez, Peskov, V, Pestov, Y, Petracek, V, Petrovici, M, Petta, C, Pezzi, RP, Piano, S, Pikna, M, Pillot, P, Pimentel, LODL, Pinazza, O, Pinsky, L, Pisano, S, Piyarathna, DB, Ploskon, M, Planinic, M, Pliquett, F, Pluta, J, Pochybova, S, Podesta-Lerma, PLM, Poghosyan, MG, Polichtchouk, B, Poljak, N, Poonsawat, W, Pop, A, Poppenborg, H, Porteboeuf-Houssais, S, Pozdniakov, V, Prasad, SK, Preghenella, R, Prino, F, Pruneau, CA, Pshenichnov, I, Puccio, M, Punin, V, Putschke, J, Raha, S, Rajput, S, Rak, J, Rakotozafindrabe, A, Ramello, L, Rami, F, Raniwala, R, Raniwala, S, Rasanen, SS, Rascanu, BT, Ratza, V, Ravasenga, I, Read, KF, Redlich, K, Rehman, A, Reichelt, P, Reidt, F, Ren, X, Renfordt, R, Reshetin, A, Revol, J-P, Reygers, K, Riabov, V, Richert, T, Richter, M, Riedler, P, Riegler, W, Riggi, F, Ristea, C, Rode, SP, Rodriguez Cahuantzi, M, Roed, K, Rogalev, R, Rogochaya, E, Rohr, D, Rohrich, D, Rokita, PS, Ronchetti, F, Rosas, ED, Roslon, K, Rosnet, P, Rossi, A, Rotondi, A, Roukoutakis, F, Roy, C, Roy, P, Rueda, OV, Rui, R, Rumyantsev, B, Rustamov, A, Ryabinkin, E, Ryabov, Y, Rybicki, A, Saarinen, S, Sadhu, S, Sadovsky, S, Safarik, K, Saha, SK, Sahoo, B, Sahoo, P, Sahoo, R, Sahoo, S, Sahu, PK, Saini, J, Sakai, S, Saleh, MA, Sambyal, S, Samsonov, V, Sandoval, A, Sarkar, A, Sarkar, D, Sarkar, N, Sarma, P, Sas, MHP, Scapparone, E, Scarlassara, F, Schaefer, B, Scheid, HS, Schiaua, C, Schicker, R, Schmidt, C, Schmidt, HR, Schmidt, MO, Schmidt, M, Schmidt, NV, Schukraft, J, Schutz, Y, Schwarz, K, Schweda, K, Scioli, G, Scomparin, E, Sefcik, M, Seger, JE, Sekiguchi, Y, Sekihata, D, Selyuzhenkov, I, Senosi, K, Senyukov, S, Serradilla, E, Sett, P, Sevcenco, A, Shabanov, A, Shabetai, A, Shahoyan, R, Shaikh, W, Shangaraev, A, Sharma, A, Sharma, A, Sharma, M, Sharma, N, Sheikh, AI, Shigaki, K, Shimomura, M, Shirinkin, S, Shou, Q, Shtejer, K, Sibiriak, Y, Siddhanta, S, Sielewicz, KM, Siemiarczuk, T, Silvermyr, D, Simatovic, G, Simonetti, G, Singaraju, R, Singh, R, Singh, R, Singhal, V, Sinha, T, Sitar, B, Sitta, M, Skaali, TB, Slupecki, M, Smirnov, N, Snellings, RJM, Snellman, TW, Song, J, Soramel, F, Sorensen, S, Sozzi, F, Sputowska, I, Stachel, J, Stan, I, Stankus, P, Stenlund, E, Stocco, D, Storetvedt, MM, Strmen, P, Suaide, AAP, Sugitate, T, Suire, C, Suleymanov, M, Suljic, M, Sultanov, R, Sumbera, M, Sumowidagdo, S, Suzuki, K, Swain, S, Szabo, A, Szarka, I, Tabassam, U, Takahashi, J, Tambave, GJ, Tanaka, N, Tarhini, M, Tariq, M, Tarzila, MG, Tauro, A, Tejeda Munoz, G, Telesca, A, Terrevoli, C, Teyssier, B, Thakur, D, Thakur, S, Thomas, D, Thoresen, F, Tieulent, R, Tikhonov, A, Timmins, AR, Toia, A, Topilskaya, N, Toppi, M, Torres, SR, Tripathy, S, Trogolo, S, Trombetta, G, Tropp, L, Trubnikov, V, Trzaska, WH, Trzcinski, TP, Trzeciak, BA, Tsuji, T, Tumkin, A, Turrisi, R, Tveter, TS, Ullaland, K, Umaka, EN, Uras, A, Usai, GL, Utrobicic, A, Vala, M, Van Hoorne, JW, van Leeuwen, M, Vande Vyvre, P, Varga, D, Vargas, A, Vargyas, M, Varma, R, Vasileiou, M, Vasiliev, A, Vauthier, A, Doce, O Vazquez, Vechernin, V, Veen, AM, Vercellin, E, Vergara Limon, S, Vermunt, L, Vernet, R, Vertesi, R, Vickovic, L, Viinikainen, J, Vilakazi, Z, Baillie, O Villalobos, Villatoro Tello, A, Vinogradov, A, Virgili, T, Vislavicius, V, Vodopyanov, A, Voelkl, MA, Voloshin, K, Voloshin, SA, Volpe, G, von Haller, 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(2018)
Dielectron production in proton-proton collisions at root s=7 TeV.
JOURNAL OF HIGH ENERGY PHYSICS, 2018 (9).
64-.
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Abstract
<jats:title>A<jats:sc>bstract</jats:sc>
</jats:title>
<jats:p>The first measurement of e<jats:sup>+</jats:sup>e<jats:sup>−</jats:sup> pair production at mid-rapidity (|<jats:italic>η</jats:italic>
<jats:sub>e</jats:sub>| < 0.8) in pp collisions at <jats:inline-formula>
<jats:alternatives>
<jats:tex-math>$$ \sqrt{s}=7 $$</jats:tex-math>
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML">
<mml:msqrt>
<mml:mi>s</mml:mi>
</mml:msqrt>
<mml:mo>=</mml:mo>
<mml:mn>7</mml:mn>
</mml:math>
</jats:alternatives>
</jats:inline-formula> TeV with ALICE at the LHC is presented. The dielectron production is studied as a function of the invariant mass (<jats:italic>m</jats:italic>
<jats:sub>ee</jats:sub> < 3.3 GeV/<jats:italic>c</jats:italic>
<jats:sup>2</jats:sup>), the pair transverse momentum (<jats:italic>p</jats:italic>
<jats:sub>T,ee</jats:sub> < 8 GeV/<jats:italic>c</jats:italic>), and the pair transverse impact parameter (DCA<jats:sub>ee</jats:sub>), i.e., the average distance of closest approach of the reconstructed electron and positron tracks to the collision vertex, normalised to its resolution. The results are compared with the expectations from a cocktail of known hadronic sources and are well described when PYTHIA is used to generate the heavy-flavour contributions. In the low-mass region (0.14 < <jats:italic>m</jats:italic>
<jats:sub>ee</jats:sub> < 1.1 GeV/<jats:italic>c</jats:italic>
<jats:sup>2</jats:sup>), prompt and non-prompt e<jats:sup>+</jats:sup>e<jats:sup>−</jats:sup> sources can be separated via the DCA<jats:sub>ee</jats:sub>. In the intermediate-mass region (1.1 < <jats:italic>m</jats:italic>
<jats:sub>ee</jats:sub> < 2.7 GeV/<jats:italic>c</jats:italic>
<jats:sup>2</jats:sup>), a double-differential fit to the data in <jats:italic>m</jats:italic>
<jats:sub>ee</jats:sub> and <jats:italic>p</jats:italic>
<jats:sub>T,ee</jats:sub> and a fit of the DCA<jats:sub>ee</jats:sub> distribution allow the total <jats:inline-formula>
<jats:alternatives>
<jats:tex-math>$$ \mathrm{c}\overline{\mathrm{c}} $$</jats:tex-math>
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML">
<mml:mi>c</mml:mi>
<mml:mover>
<mml:mi>c</mml:mi>
<mml:mo>¯</mml:mo>
</mml:mover>
</mml:math>
</jats:alternatives>
</jats:inline-formula> and <jats:inline-formula>
<jats:alternatives>
<jats:tex-math>$$ \mathrm{b}\overline{\mathrm{b}} $$</jats:tex-math>
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML">
<mml:mi>b</mml:mi>
<mml:mover>
<mml:mi>b</mml:mi>
<mml:mo>¯</mml:mo>
</mml:mover>
</mml:math>
</jats:alternatives>
</jats:inline-formula> cross sections to be extracted. Two different event generators, PYTHIA and POWHEG, can reproduce the shape of the two-dimensional <jats:italic>m</jats:italic>
<jats:sub>ee</jats:sub> and <jats:italic>p</jats:italic>
<jats:sub>T,ee</jats:sub> spectra, as well as the shape of the DCA<jats:sub>ee</jats:sub> distribution, reasonably well. However, differences in the <jats:inline-formula>
<jats:alternatives>
<jats:tex-math>$$ \mathrm{c}\overline{\mathrm{c}} $$</jats:tex-math>
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML">
<mml:mi>c</mml:mi>
<mml:mover>
<mml:mi>c</mml:mi>
<mml:mo>¯</mml:mo>
</mml:mover>
</mml:math>
</jats:alternatives>
</jats:inline-formula> and <jats:inline-formula>
<jats:alternatives>
<jats:tex-math>$$ \mathrm{b}\overline{\mathrm{b}} $$</jats:tex-math>
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML">
<mml:mi>b</mml:mi>
<mml:mover>
<mml:mi>b</mml:mi>
<mml:mo>¯</mml:mo>
</mml:mover>
</mml:math>
</jats:alternatives>
</jats:inline-formula> cross sections are observed when using the generators to extrapolate to full phase space. Finally, the ratio of inclusive to decay photons is studied via the measurement of virtual direct photons in the transverse-momentum range 1 < <jats:italic>p</jats:italic>
<jats:sub>T</jats:sub> < 8 GeV/<jats:italic>c</jats:italic>. This is found to be unity within the statistical and systematic uncertainties and consistent with expectations from next-to-leading order perturbative quantum chromodynamic calculations.
</jats:p>
Dimensions
Dimensions
