Search for exclusive or semi-exclusive gamma gamma production and observation of exclusive and semi-exclusive e(+)e(-) production in pp collisions at root s=7 TeV
S Chatrchyan, Vardan Khachatryan,A M Sirunyan, A Tumasyan, W Adam, T Bergauer,M Dragicevic,J Eroe, C Fabjan,Mark A Friedl, Rudolf Fruehwirth,V M Ghete,Josef Hammer, N Hoermann, J Hrubec,M Jeitler, W Kiesenhofer,V Knuenz,Manfred Krammer, D Liko, I Mikulec, M Pernicka,Babak Rahbaran, C Rohringer, H Rohringer, R Schoefbeck,Jerome F Strauss, A Taurok,P Wagner,Wolfgang Waltenberger, G Walzel,E Widl, C E Wulz, Vladimir Mossolov, N Shumeiko,J Suarez Gonzalez,Sunil Bansal,Tom Cornelis,E A De Wolf, X Janssen,Sten Luyckx,T Maes, L Mucibello, S Ochesanu, Benoit Roland, R Rougny,Michele Selvaggi,Z Staykova,H Van Haevermaet,P Van Mechelen,N Van Remortel,A Van Spilbeeck, F Blekman,S Blyweert,J Dhondt,R Gonzalez Suarez, A Kalogeropoulos,M Maes, Annik Olbrechts,W Van Doninck,P Van Mulders,G P Van Onsem,I Villella,Barbara Clerbaux,G De Lentdecker, Vincent Dero,Arnaud Gay,Tomas Hreus,Alexandre Leonard,Pierre Marage, T Reis,L Thomas,C Vander Velde, Pascal Vanlaer, Jing Wang,Volker Adler, Kelly Beernaert,Anna Cimmino, S Costantini,G Garcia, M W Grunewald,Barbara E K Klein,J Lellouch, Andrey Marinov,Joseph Mccartin,A A Ocampo Rios, D Ryckbosch,Nadja Strobbe,Filip Thyssen, M Tytgat,Lukas Vanelderen,Piet Verwilligen,S Walsh,Efe Yazgan, N Zaganidis, Suzan Basegmez, G Bruno,Roberto Castello,Adrien Caudron, Ludivine Ceard, Christophe Delaere,T Du Pree, Denis Favart, Laurent Forthomme,Andrea Giammanco, Jonathan Hollar,Vincent Lemaitre,Junhui Liao,Otilia Militaru, Claude Nuttens,D Pagano, Lucia Perrini, Arnaud Pin, Krzysztof Piotrzkowski,Nicolas Schul,J M Vizan Garcia,Nikita Beliy,Thierry Caebergs, E Daubie, Gregory Habib Hammad, G A Alves,M Correa Martins Junior,D De Jesus Damiao, T Martins, M E Pol, M H G Souza,W L Alda Junior, W Carvalho, Analu Custodio,E M Da Costa,C De Oliveira Martins,S Fonseca De Souza,D Matos Figueiredo, L Mundim, H Nogima, V Oguri,W L Prado Da Silva, A Santoro,L Soares Jorge, A Sznajder, C A Unesp Bernardes, F A Unesp Dias,T R Fernandez Perez Unesp Tomei, E M Unesp Gregores, C Unesp Lagana,F Unesp Marinho, P G Unesp Mercadante,S F Unesp Novaes,Sandra Padula, Vladimir Genchev, P Iaydjiev,Stefan Piperov, M Rodozov, Stefka Stoykova, G Sultanov, Vanio Tcholakov,R Trayanov, Mariana Vutova,A Dimitrov, Roumyana Hadjiiska, V Kozhuharov, L Litov,Borislav Pavlov,Peicho Petkov,J G Bian,G M Chen, H S Chen, C H Jiang,Dong Liang,S Liang,X Meng,J Tao,X Wang, Zheng Wang,H Xiao,Min Xu,Jingjing Zang,Z Zhang,Chayanit Asawatangtrakuldee, Y Ban,Shaoyong Guo,Yan Guo, Wenxia Li, Shengbing Liu,Yilei Mao, S J Qian,H Teng, S Wang,Bin Zhu,Wei Zou, C Avila, Jonatan Piedra Gomez,B Gomez Moreno,A F Osorio Oliveros, J C Sanabria, N Godinovic, D Lelas, Roko Plestina, Dunja Polic, I Puljak,Zeljko Antunovic,M Kovac, V Brigljevic,Senka Duric, K Kadija, Jelena Luetic,Srecko Morovic,Alexandros Attikis,Mario Galanti,Georgios Mavromanolakis, J Mousa,C Nicolaou, Fotios Ptochos, P A Razis, M Finger, Y Assran, S Elgammal,A Ellithi Kamel, S Khalil, M A Mahmoud, Amr Radi,Mario Kadastik, M Muentel,Martti Raidal,Liis Rebane, Andres Tiko, V Azzolini, P Eerola,Giacomo Fedi, M Voutilainen, J Harkonen,A Heikkinen, V Karimaki, Ritva Kinnunen,Matti J Kortelainen,T Lampen, K Lassilaperini, S Lehti, Tomas Linden,Panjariina Luukka, T Maenpaa, Timo Peltola, E Tuominen, J Tuominiemi,Esa Tuovinen, D Ungaro, Lauri Wendland, K Banzuzi,A Karjalainen, A Korpela, T Tuuva, M Besancon, Somnath Choudhury, M Dejardin, D Denegri, B Fabbro, J L Faure, F Ferri, S Ganjour, A Givernaud, P Gras,G Hamel De Monchenault, P Jarry, E Locci, J Malcles, L Millischer,Aruna Nayak, J Rander, A Rosowsky, I Shreyber, M Titov, S Baffioni, F Beaudette,Lamia Benhabib,Lorenzo Bianchini, M Bluj, C Broutin, P Busson, C Charlot, Nadir Daci, T Dahms, L Dobrzynski,R Granier De Cassagnac,M Haguenauer, P Mine, C Mironov, M Nguyen, C Ochando, P Paganini, D Sabes,Roberto Salerno, Y Sirois, C Veelken, A Zabi, J L Agram, J Andrea, D Bloch, D Bodin, J M Brom,Marco Cardaci, E C Chabert,Caroline Collard, E Conte, F Drouhin,Charles J Ferro, J C Fontaine, D Gele, U Goerlach, P Juillot,A C Le Bihan,P Van Hove, F Fassi, D Mercier, S Beauceron, N Beaupere,Olivier Bondu, G Boudoul, J Chasserat, R Chierici, D Contardo, P Depasse,H El Mamouni, J Fay, S Gascon, M Gouzevitch, B Ille, T Kurca, M Lethuillier, L Mirabito, S Perries, V Sordini, S Tosi, Y Tschudi, P Verdier,S Viret,Zviad Tsamalaidze, G Anagnostou,Sarah Beranek,Matthias Edelhoff, L Feld,Natalie Heracleous, Otto Hindrichs, R Jussen,K Klein, Jennifer Merz, Andrey Ostapchuk,Adrian Perieanu, F Raupach,Jan Sammet,S Schael, D Sprenger, B Wittmer, V G Zhukov,Metin Ata,Julien Caudron,Erik Dietzlaursonn, Deborah Duchardt, M Erdmann,Rainer Fischer, A Gueth, T Hebbeker, Carsten Heidemann, K Hoepfner,Dennis Klingebiel,Peter Kreuzer, Joschka Lingemann, C Magass, M Merschmeyer,Mark Olschewski,Paul Papacz, H Pieta, H Reithler,Stefan Antonius Schmitz, L Sonnenschein,Jan Steggemann, D Teyssier, M Weber, M Bontenackels, Vladimir Cherepanov,G Fluegge,Heiko Geenen,M Geisler,W Haj Ahmad, Felix Hoehle,Bastian Kargoll,Thomas Kress, Yvonne Kuessel, A Nowack, L Perchalla, O Pooth, Jorg Rennefeld, P Sauerland,Achim Stahl,M Aldaya Martin, J Behr, W Behrenhoff, U Behrens, M Bergholz, Agni Bethani, K Borras,Armin Burgmeier, Altan Cakir, Luigi Calligaris,Alan Campbell,Elena Castro, Francesco Costanza, D Dammann,C Diez Pardos,G Eckerlin, D Eckstein, G Flucke, A Geiser, I Glushkov, Paolo Gunnellini,S Habib,Johannes Hauk,G Hellwig, Hoseop Jung, M Kasemann, P Katsas, C Kleinwort, H Kluge, A Knutsson,Michael Kraemer,D Kruecker,Ekaterina Kuznetsova,W Lange, W Lohmann, Beat Lutz, R Mankel, Ihar Marfin, M Marienfeld, I A Melzerpellmann, A Meyer, J Mnich, Andreas Mussgiller,Sebastian Naumannemme, J Olzem,Hanno Perrey, A Petrukhin, D Pitzl, A Raspereza,P M Ribeiro Cipriano,C Riedl,E Ron, Michele Rosin,Jakob Salfeldnebgen,Richard R Schmidt,Thomas Schoernersadenius,Niladri Sen,A Spiridonov,M Stein,Roberval Walsh,Christoph Wissing, C Autermann, V Blobel,S Bobrovskyi, J Draeger, H Enderle, Joachim Erfle, U Gebbert,M Goerner, T Hermanns,R S Hoeing, K Kaschube, G Kaussen,Henning Kirschenmann, R Klanner, J S Lange, B Mura,Friederike Nowak, T Peiffer,Niklas Pietsch,Denis Rathjens,C Sander, Hannes Schettler, P Schleper,Eike Schlieckau,A Schmidt,Mark A Schroeder, T Schum,Markus Seidel, H Stadie,G Steinbrueck,Jan Thomsen,Christian Barth,J Berger,C Boeser,T Chwalek,W De Boer, Alexis Descroix, A Dierlamm, M Feindt,Moritz Guthoff, C Hackstein,F Hartmann,Thomas Hauth,M Heinrich,H Held, K H Hoffmann, S Honc, I Katkov,Jyothsna Rani Komaragiri, D Martschei,Sabine Mueller,T Mueller, M Niegel, A Nuernberg, O Oberst, A Oehler, Jochen Ott, G Quast, K Rabbertz, F Ratnikov, N Ratnikova,S Roecker, A Scheurer, F P Schilling, G Schott, H J Simonis, F M Stober,Daniel Troendle,R Ulrich, J Wagnerkuhr, Stefan Wayand,Thomas Weiler, M Zeise, G Daskalakis, T Geralis, S Kesisoglou, A Kyriakis, D Loukas, I Manolakos, A Markou, C Markou, C Mavrommatis,Eleni Ntomari,Loukas Gouskos,T J Mertzimekis, Apostolos Panagiotou,Niki Saoulidou, I Evangelou, C Foudas, P Kokkas, N Manthos, I Papadopoulos,Vaios Patras, G Bencze, C Hajdu, P Hidas, D Horvath, F Sikler, V Veszpremi, G Vesztergombi, N Beni, S Czellar,J Molnar, J Palinkas, Z Szillasi, Janos Karancsi, P Raics, Zoltan Laszlo Trocsanyi, B Ujvari,M Bansal, S B Beri, V Bhatnagar,Nitish Dhingra, R Gupta, M Kaur, M Z Mehta, Nishu Nishu, Lovedeep Kaur Saini, A K Sharma, J B Singh,Arun Kumar,Sudha Ahuja,A Bhardwaj, B Choudhary, S L Malhotra, M Naimuddin, K Ranjan, V K Sharma, R K Shivpuri,Sw Banerjee, S K Bhattacharya,S Dutta,Bhawna Gomber,R Khurana, S Sarkar, Manoj Sharan,Abdulla Abdulsalam, R K Choudhury, D Dutta, S Kailas,V Kumar, P K Mehta, A K Mohanty, L M Pant,P Shukla, T Aziz, Sumit Ganguly,Monoranjan Guchait, M Maity, G Majumder, K Mazumdar, G B Mohanty,Bibhuti Parida, K Sudhakar, Nadeesha Wickramage, S R Dugad, H Arfaei,Hamed Bakhshiansohi,Seyed Mohsen Etesami,Ali Fahim,Majid Hashemi,Abideh Jafari, M Khakzad,A Mohammadi,Mojtaba Mohammadi Najafabadi,S Paktinat Mehdiabadi,Batool Safarzadeh,Maryam Zeinali, M Abbrescia, L Barbone,Cesare Calabria,Simranjit Singh Chhibra, A Colaleo, D Creanza,N De Filippis,M De Palma,L Fiore, G Iaselli, L Lusito, G Maggi, M Maggi, B Marangelli, S My, S Nuzzo, N Pacifico, A Pompili,G Pugliese, G Selvaggi, L Silvestris, G B Singh,Rosamaria Venditti, G Zito, G Abbiendi, A C Benvenuti, D Bonacorsi,Sylvie Braibantgiacomelli, L Brigliadori, P Capiluppi, A Castro, F R Cavallo, M Cuffiani, G M Dallavalle, F Fabbri, A Fanfani,Daniele Fasanella, P Giacomelli, C Grandi,Luigi Guiducci, S Marcellini, G Masetti, M Meneghelli, A Montanari, F L Navarria, F Odorici, A Perrotta,Federica Primavera, A M Rossi, T Rovelli, G P Siroli,Riccardo Travaglini, S Albergo, Gigi Cappello, M Chiorboli, S Costa, R Potenza, A Tricomi, C Tuve, G Barbagli, V Ciulli, C Civinini, R Dalessandro, E Focardi, S Frosali,E Gallo,Sandro Gonzi, M Meschini, S Paoletti, G Sguazzoni,Antonio Tropiano, L Benussi, S Bianco, S Colafranceschi, D Piccolo, P Fabbricatore, R Musenich,Andrea Benaglia,F De Guio,L Di Matteo,Sara Fiorendi, Simone Gennai,Alessio Ghezzi, S Malvezzi, Riccardo Andrea Manzoni,Arabella Martelli, Andrea Massironi, D Menasce, L Moroni, M Paganoni, D Pedrini, S Ragazzi, N Redaelli, S Sala,T Tabarelli De Fatis, S Buontempo,C A Carrillo Montoya, N Cavallo,A De Cosa, O Dogangun, F Fabozzi, Alberto Orso Maria Iorio, L Lista,Sabino Meola, M Merola,P Paolucci,Patrizia Azzi, N Bacchetta, D Bisello, A Branca, R Carlin, P Checchia, T Dorigo,Fabrizio Gasparini, U Gasparini, Andrea Gozzelino,M Gulmini,Konstantin Kanishchev, S Lacaprara, I Lazzizzera, M Margoni,Anna Teresa Meneguzzo, J Pazzini,Nicola Pozzobon, P Ronchese, F Simonetto,E Torassa, M P Tosi, S Vanini, P Zotto, Alberto Zucchetta, G Zumerle,Michele Gabusi, S P Ratti, C Riccardi, P Torre, P Vitulo, M Biasini, G M Bilei, L Fano, P Lariccia, A Lucaroni, G Mantovani, M Menichelli, A Nappi,Francesco Romeo,A Saha, A 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Park, Sangryul Ro, D C Son,T Son,J Y Kim, Zero Jaeho Kim,Sangsub Song,Suyong Choi, Dooyeon Gyun, B Hong,M Jo,H Kim,T J Kim,K S Lee, D H Moon, S K Park, M Choi,Sewon Kang, Chongwook Park, I C Park, Geonmo Ryu, Yongkeun Cho, Y K Choi, Junghwan Goh,M S Kim,E Kwon,B Lee,J Lee,H Seo, I Yu, M J Bilinskas, I Grigelionis, M Janulis,Andrius Juodagalvis,H Castillavaldez,E De La Cruzburelo,I Herediade La Cruz, R Lopezfernandez, R Magana Villalba,J Martinezortega, A Sanchezhernandez, L M Villasenorcendejas,S Carrillo Moreno,F Vazquez Valencia,H A Salazar Ibarguen,E Casimiro Linares,A Morelos Pineda, M A Reyessantos,D Krofcheck, Alan James Bell, Philip H Butler, R Doesburg, S Reucroft, H Silverwood,M Ahmad, M I Asghar, Hafeez R Hoorani,Shoaib Khalid,W A Khan,Taimoor Khurshid, Shamona Qazi, M A Shah,Muhammad Shoaib, H Bialkowska,Bozena Boimska, Tomasz Frueboes, R Gokieli,M Gorski, Malgorzata Kazana, K Nawrocki,Katarzyna Romanowskarybinska, M Szleper, G Wrochna, P Zalewski,Grzegorz Brona,Karol Bunkowski, M Cwiok, W Dominik, K Doroba,Artur Kalinowski,Marcin Konecki, J Krolikowski,N Almeida, P Bargassa, A David,Pietro Faccioli, Maria Olivia Vaz Fernandes,P G Ferreira Parracho, M Gallinaro,J M Seixas, J A Varela,Pietro Vischia, I Belotelov, Pavel Bunin, Mikhail Gavrilenko, I Golutvin,Ilya Gorbunov,Alexey Kamenev, Vladimir Karjavin,G Kozlov, Alexander Lanev,A Malakhov, P Moisenz, Vladimir Palichik, Victor Perelygin, Sergey Shmatov,Valeriy V Smirnov, A Volodko,Anatoli Zarubin, S Evstyukhin, Victor Golovtsov, Yu D Ivanov,Victor Kim, Petr Levchenko,V Murzin,Vadim Oreshkin, I Smirnov, Valentin Sulimov, L Uvarov, S Vavilov, A Vorobyev,Yu Andreev, Alexander Dermenev, S Gninenko, N Golubev, M Kirsanov, Nikolai Krasnikov,Viktor Matveev, Anatoli Pashenkov,Danila Tlisov, A Toropin,Vladimir Epshteyn, M Erofeeva, V Gavrilov, M Kossov, Natalia Lychkovskaya,V S Popov, G Safronov, S Semenov, V Stolin, E Vlasov, A Zhokin, A Belyaev, E Boos, L V Dudko,A P Ershov, A Gribushin,L A Khein, V 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Hansen,Phillip J Harris,Christian Hartl,Jeffrey A Harvey, B Hegner,Andreas Hinzmann, V Innocente, P Janot, K Kaadze, E Karavakis,Konstantinos Kousouris, P Lecoq,Y J Lee,Piergiulio Lenzi,C Lourenco, T Maeki,Martina Malberti, L Malgeri, M Mannelli, L Masetti, F Meijers,Stefano Mersi, E Meschi, Robert D Moser, M U Mozer, M Mulders,Pasquale Musella, E Nesvold, T J Orimoto,L Orsini,E Palencia Cortezon, Edith A Perez,Luca Perrozzi, Achille Petrilli, A Pfeiffer, M Pierini, M Pimiae,Danilo Piparo, G Polese, Loic Quertenmont,A Racz, W Reece,Ricardo Antunes,Gigi Rolandi, T Rommerskirchen, C Rovelli, M Rovere,Hannes Sakulin,Francesco Santanastasio, C Schaefer, C Schwick, I Segoni, S Sekmen, P Siegrist, Matthew D Simon, P Sphicas,Daniele Spiga, M Spiropulu,Markus Stoye, A Tsirou, G I Veres, J R Vlimant,H K Woehri, Steven Worm, W Zeuner, W Bertl, K Deiters, W Erdmann, K Gabathuler, R Horisberger, Q Ingram, Hanschristian Kaestli,S Koenig,Danek Kotlinski, U Langenegger, F Meier, D Renker, T Rohe, J Sibille, L Baeni,P Bortignon, M A Buchmann, B Casal, N Chanon, A Deisher, G Dissertori, M Dittmar, M Duenser,J Eugster, K Freudenreich, C Grab, Dmitry Hits,P Lecomte, W Lustermann, Andrea Carlo Marini,P Martinez Ruiz Del Arbol, N Mohr, F Moortgat, C Naegeli, P Nef, F Nessitedaldi, Francesco Pandolfi, L Pape, F Pauss, Marco Peruzzi, F J Ronga, Marco Rossini,Leonardo Sala,A Sanchez, Andrei Starodumov, Benjamin Stieger, Maiko Takahashi, L Tauscher,Alessandro Thea,Konstantinos Theofilatos, D Treille, C Urscheler, R Wallny, H A Weber, L Wehrli, E Aguilo, C Amsler,Vincenzo Chiochia,S De Visscher, C Favaro,M Ivova Rikova,B Millan Mejias, P Otiougova, P Robmann,H Snoek, Salvatore Tupputi, Mauro Verzetti, C M Kuo, S W Li, Wei Lin,Z K Liu, Y J Lu, D Mekterovic, Ajit Singh,R Volpe, S S Yu, P Bartalini, P Chang,Y W Chang, Y Chao,K F Chen, Charles Dietz, U Grundler, W S Hou, Yee Hsiung, K Y Kao, Y J Lei, R S Lu,D Majumder,Eleni Petrakou, Xiufan Shi, J G Shiu, Y M Tzeng, Xianlong Wan, Moran Wang, 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Gilmore, T Kamon, V Khotilovich,R Montalvo, I Osipenkov,Y Pakhotin, Alexx Perloff,J Roe, A Safonov, T Sakuma, S Sengupta, Indara Suarez,Aysen Tatarinov, D Toback, N Akchurin, Jordan Damgov, Phillip Russell Dudero, Chiyoung Jeong, Kittikul Kovitanggoon, S W Lee, Terence Libeiro, Youn Roh, I Volobouev,E Appelt, Carlos Florez,S V Greene,Alfredo Gurrola, W Johns,Colin I Johnston,Pelin Kurt, C Maguire,A Melo, P Sheldon, Benjamin Snook, Shengquan Tuo, J Velkovska, Michael Wayne Arenton, M Balazs, Sarah Boutle, B Cox,B Francis,J Goodell, R Hirosky, A Ledovskoy, Chienhuang Lin, C Neu, Rachel Yohay, S Gollapinni, R F Harr, P E Karchin,C Kottachchi Kankanamge Don, Pramod Lamichhane, Alexandre Sakharov,M Anderson,Michail Bachtis, Donald Belknap, L Borrello, D Carlsmith, M Cepeda, S Dasu,E Friis, L J Gray, K S Grogg, M Grothe, R Hallwilton, M Herndon,A Herve, Pamela Klabbers, J Klukas, A Lanaro, C Lazaridis,J Leonard,R Loveless, A Mohapatra,I Ojalvo, F Palmonari, Giuseppe Antonio Pierro, Ian Ross, A Savin, W H Smith,J Swanson
Journal of High Energy Physics（2012）
引用 62|浏览818
摘要
A search for exclusive or semi-exclusive photon pair production, pp to p(*) + photon pair + p(*) (where p(*) stands for a diffractively-dissociated proton), and the observation of exclusive and semi-exclusive electron pair production, pp to p(*) + ee + p(*), in proton-proton collisions at sqrt(s) = 7 TeV, are presented. The analysis is based on a data sample corresponding to an integrated luminosity of 36 inverse picobarns recorded by the CMS experiment at the LHC at low instantaneous luminosities. Candidate photon pair or electron pair events are selected by requiring the presence of two photons or a positron and an electron, each with transverse energy ET > 5.5 GeV and pseudorapidity abs(eta) < 2.5, and no other particles in the region abs(eta) < 5.2. No exclusive or semi-exclusive diphoton candidates are found in the data. An upper limit on the cross section for the reaction pp to p(*) + photon pair + p(*), within the above kinematic selections, is set at 1.18 pb at 95% confidence level. Seventeen exclusive or semi-exclusive dielectron candidates are observed, with an estimated background of 0.85 +/- 0.28 (stat.) events, in agreement with the QED-based prediction of 16.3 +/- 1.3 (syst.) events.
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