Search for pair production of first-generation scalar leptoquarks in pp collisions at √s = 7 TeV.
Phys Rev Lett 106:20 (2011) 201802
Authors:
V Khachatryan, AM Sirunyan, A Tumasyan, W Adam, T Bergauer, M Dragicevic, J Erö, C Fabjan, M Friedl, R Frühwirth, VM Ghete, J Hammer, S Hänsel, C Hartl, M Hoch, N Hörmann, J Hrubec, M Jeitler, G Kasieczka, W Kiesenhofer, M Krammer, D Liko, I Mikulec, M Pernicka, H Rohringer, R Schöfbeck, J Strauss, A Taurok, F Teischinger, P Wagner, W Waltenberger, G Walzel, E Widl, C-E Wulz, V Mossolov, N Shumeiko, J Suarez Gonzalez, L Benucci, K Cerny, EA De Wolf, X Janssen, T Maes, L Mucibello, S Ochesanu, B Roland, R Rougny, M Selvaggi, H Van Haevermaet, P Van Mechelen, N Van Remortel, S Beauceron, F Blekman, S Blyweert, J D'Hondt, O Devroede, R Gonzalez Suarez, A Kalogeropoulos, J Maes, M Maes, S Tavernier, W Van Doninck, P Van Mulders, GP Van Onsem, I Villella, O Charaf, B Clerbaux, G De Lentdecker, V Dero, APR Gay, GH Hammad, T Hreus, PE Marage, L Thomas, C Vander Velde, P Vanlaer, J Wickens, V Adler, S Costantini, M Grunewald, B Klein, A Marinov, J McCartin, D Ryckbosch, F Thyssen, M Tytgat, L Vanelderen, P Verwilligen, S Walsh, N Zaganidis, S Basegmez, G Bruno, J Caudron, L Ceard, J De Favereau De Jeneret, C Delaere, P Demin, D Favart, A Giammanco, G Grégoire, J Hollar, V Lemaitre, J Liao, O Militaru, S Ovyn, D Pagano, A Pin, K Piotrzkowski, N Schul, N Beliy, T Caebergs, E Daubie, GA Alves, D De Jesus Damiao, ME Pol, MHG Souza, W Carvalho, EM Da Costa, C De Oliveira Martins, S Fonseca De Souza, L Mundim, H Nogima, V Oguri, WL Prado Da Silva, A Santoro, SM Silva Do Amaral, A Sznajder, F Torres Da Silva De Araujo, FA Dias, MAF Dias, TR Fernandez Perez Tomei, EM Gregores, F Marinho, SF Novaes, Sandra S Padula, N Darmenov, L Dimitrov, V Genchev, P Iaydjiev, S Piperov, M Rodozov, S Stoykova, G Sultanov, V Tcholakov, R Trayanov, I Vankov, M Dyulendarova, R Hadjiiska, V Kozhuharov, L Litov, E Marinova, M Mateev, B Pavlov, P Petkov, JG Bian, GM Chen, HS Chen, CH Jiang, D Liang, S Liang, J Wang, J Wang, X Wang, Z Wang, M Xu, M Yang, J Zang, Z Zhang, Y Ban, S Guo, Y Guo, W Li, Y Mao, SJ Qian, H Teng, L Zhang, B Zhu, W Zou, A Cabrera, B Gomez Moreno, AA Ocampo Rios, AF Osorio Oliveros, JC Sanabria, N Godinovic, D Lelas, K Lelas, R Plestina, D Polic, I Puljak, Z Antunovic, M Dzelalija, V Brigljevic, S Duric, K Kadija, S Morovic, A Attikis, M Galanti, J Mousa, C Nicolaou, F Ptochos, PA Razis, H Rykaczewski, Y Assran, MA Mahmoud, A Hektor, M Kadastik, K Kannike, M Müntel, M Raidal, L Rebane, V Azzolini, P Eerola, S Czellar, J Härkönen, A Heikkinen, V Karimäki, R Kinnunen, J Klem, MJ Kortelainen, T Lampén, K Lassila-Perini, S Lehti, T Lindén, P Luukka, T Mäenpää, E Tuominen, J Tuominiemi, E Tuovinen, D Ungaro, L Wendland, K Banzuzi, A Korpela, T Tuuva, D Sillou, M Besancon, S Choudhury, M Dejardin, D Denegri, B Fabbro, JL Faure, F Ferri, S Ganjour, FX Gentit, A Givernaud, P Gras, G Hamel de Monchenault, P Jarry, E Locci, J Malcles, M Marionneau, L Millischer, J Rander, A Rosowsky, I Shreyber, M Titov, P Verrecchia, S Baffioni, F Beaudette, L Bianchini, M Bluj, C Broutin, P Busson, C Charlot, T Dahms, L Dobrzynski, R Granier de Cassagnac, M Haguenauer, P Miné, C Mironov, C Ochando, P Paganini, D Sabes, R Salerno, Y Sirois, C Thiebaux, B Wyslouch, A Zabi, J-L Agram, J Andrea, A Besson, D Bloch, D Bodin, J-M Brom, M Cardaci, EC Chabert, C Collard, E Conte, F Drouhin, C Ferro, J-C Fontaine, D Gelé, U Goerlach, S Greder, P Juillot, M Karim, A-C Le Bihan, Y Mikami, P Van Hove, F Fassi, D Mercier, C Baty, N Beaupere, M Bedjidian, O Bondu, G Boudoul, D Boumediene, H Brun, N Chanon, R Chierici, D Contardo, P Depasse, H El Mamouni, A Falkiewicz, J Fay, S Gascon, B Ille, T Kurca, T Le Grand, M Lethuillier, L Mirabito, S Perries, V Sordini, S Tosi, Y Tschudi, P Verdier, H Xiao, L Megrelidze, V Roinishvili, D Lomidze, G Anagnostou, M Edelhoff, L Feld, N Heracleous, O Hindrichs, R Jussen, K Klein, J Merz, N Mohr, A Ostapchuk, A Perieanu, F Raupach, J Sammet, S Schael, D Sprenger, H Weber, M Weber, B Wittmer, M Ata, W Bender, M Erdmann, J Frangenheim, T Hebbeker, A Hinzmann, K Hoepfner, C Hof, T Klimkovich, D Klingebiel, P Kreuzer, D Lanske, C Magass, G Masetti, M Merschmeyer, A Meyer, P Papacz, H Pieta, H Reithler, SA Schmitz, L Sonnenschein, J Steggemann, D Teyssier, M Bontenackels, M Davids, M Duda, G Flügge, H Geenen, M Giffels, W Haj Ahmad, D Heydhausen, T Kress, Y Kuessel, A Linn, A Nowack, L Perchalla, O Pooth, J Rennefeld, P Sauerland, A Stahl, M Thomas, D Tornier, MH Zoeller, M Aldaya Martin, W Behrenhoff, U Behrens, M Bergholz, K Borras, A Cakir, A Campbell, E Castro, D Dammann, G Eckerlin, D Eckstein, A Flossdorf, G Flucke, A Geiser, I Glushkov, J Hauk, H Jung, M Kasemann, I Katkov, P Katsas, C Kleinwort, H Kluge, A Knutsson, D Krücker, E Kuznetsova, W Lange, W Lohmann, R Mankel, M Marienfeld, I-A Melzer-Pellmann, AB Meyer, J Mnich, A Mussgiller, J Olzem, A Parenti, A Raspereza, A Raval, R Schmidt, T Schoerner-Sadenius, N Sen, M Stein, J Tomaszewska, D Volyanskyy, R Walsh, C Wissing, C Autermann, S Bobrovskyi, J Draeger, H Enderle, U Gebbert, K Kaschube, G Kaussen, R Klanner, J Lange, B Mura, S Naumann-Emme, F Nowak, N Pietsch, C Sander, H Schettler, P Schleper, M Schröder, T Schum, J Schwandt, AK Srivastava, H Stadie, G Steinbrück, J Thomsen, R Wolf, C Barth, J Bauer, V Buege, T Chwalek, W De Boer, A Dierlamm, G Dirkes, M Feindt, J Gruschke, C Hackstein, F Hartmann, SM Heindl, M Heinrich, H Held, KH Hoffmann, S Honc, T Kuhr, D Martschei, S Mueller, Th Müller, M Niegel, O Oberst, A Oehler, J Ott, T Peiffer, D Piparo, G Quast, K Rabbertz, F Ratnikov, M Renz, C Saout, A Scheurer, P Schieferdecker, F-P Schilling, G Schott, HJ Simonis, FM Stober, D Troendle, J Wagner-Kuhr, M Zeise, V Zhukov, EB Ziebarth, G Daskalakis, T Geralis, S Kesisoglou, A Kyriakis, D Loukas, I Manolakos, A Markou, C Markou, C Mavrommatis, E Ntomari, E Petrakou, L Gouskos, TJ Mertzimekis, A Panagiotou, I Evangelou, C Foudas, P Kokkas, N Manthos, I Papadopoulos, V Patras, FA Triantis, A Aranyi, G Bencze, L Boldizsar, G Debreczeni, C Hajdu, D Horvath, A Kapusi, K Krajczar, A Laszlo, F Sikler, G Vesztergombi, N Beni, J Molnar, J Palinkas, Z Szillasi, V Veszpremi, P Raics, ZL Trocsanyi, B Ujvari, S Bansal, SB Beri, V Bhatnagar, N Dhingra, R Gupta, M Jindal, M Kaur, JM Kohli, MZ Mehta, N Nishu, LK Saini, A Sharma, AP Singh, JB Singh, SP Singh, S Ahuja, S Bhattacharya, BC Choudhary, P Gupta, S Jain, S Jain, A Kumar, RK Shivpuri, RK Choudhury, D Dutta, S Kailas, SK Kataria, AK Mohanty, LM Pant, P Shukla, T Aziz, M Guchait, A Gurtu, M Maity, D Majumder, G Majumder, K Mazumdar, GB Mohanty, A Saha, K Sudhakar, N Wickramage, S Banerjee, S Dugad, NK Mondal, H Arfaei, H Bakhshiansohi, SM Etesami, A Fahim, M Hashemi, A Jafari, M Khakzad, A Mohammadi, M Mohammadi Najafabadi, S Paktinat Mehdiabadi, B Safarzadeh, M Zeinali, M Abbrescia, L Barbone, C Calabria, A Colaleo, D Creanza, N De Filippis, M De Palma, A Dimitrov, L Fiore, G Iaselli, L Lusito, G Maggi, M Maggi, N Manna, B Marangelli, S My, S Nuzzo, N Pacifico, GA Pierro, A Pompili, G Pugliese, F Romano, G Roselli, G Selvaggi, L Silvestris, R Trentadue, S Tupputi, G Zito, G Abbiendi, AC Benvenuti, D Bonacorsi, S Braibant-Giacomelli, L Brigliadori, P Capiluppi, A Castro, FR Cavallo, M Cuffiani, GM Dallavalle, F Fabbri, A Fanfani, D Fasanella, P Giacomelli, M Giunta, S Marcellini, M Meneghelli, A Montanari, FL Navarria, F Odorici, A Perrotta, F Primavera, AM Rossi, T Rovelli, G Siroli, R Travaglini, S Albergo, G Cappello, M Chiorboli, S Costa, A Tricomi, C Tuve, G Barbagli, V Ciulli, C Civinini, R D'Alessandro, E Focardi, S Frosali, E Gallo, C Genta, S Gonzi, P Lenzi, M Meschini, S Paoletti, G Sguazzoni, A Tropiano, L Benussi, S Bianco, S Colafranceschi, F Fabbri, D Piccolo, P Fabbricatore, R Musenich, A Benaglia, F De Guio, L Di Matteo, A Ghezzi, M Malberti, S Malvezzi, A Martelli, A Massironi, D Menasce, L Moroni, M Paganoni, D Pedrini, S Ragazzi, N Redaelli, S Sala, T Tabarelli de Fatis, V Tancini, S Buontempo, CA Carrillo Montoya, A Cimmino, A De Cosa, 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S Conetti, B Cox, B Francis, R Hirosky, A Ledovskoy, C Lin, C Neu, R Yohay, S Gollapinni, R Harr, PE Karchin, P Lamichhane, M Mattson, C Milstène, A Sakharov, M Anderson, M Bachtis, JN Bellinger, D Carlsmith, S Dasu, J Efron, L Gray, KS Grogg, M Grothe, R Hall-Wilton, M Herndon, P Klabbers, J Klukas, A Lanaro, C Lazaridis, J Leonard, R Loveless, A Mohapatra, D Reeder, I Ross, A Savin, WH Smith, J Swanson, M Weinberg, CMS Collaboration
Abstract:
A search for pair production of first-generation scalar leptoquarks is performed in the final state containing two electrons and two jets using proton-proton collision data at √s = 7 TeV. The data sample used corresponds to an integrated luminosity of 33 pb⁻¹ collected with the CMS detector at the CERN LHC. The number of observed events is in good agreement with the predictions for the standard model background processes, and an upper limit is set on the leptoquark pair production cross section times β² as a function of the leptoquark mass, where β is the branching fraction of the leptoquark decay to an electron and a quark. A 95% confidence level lower limit is set on the mass of a first-generation scalar leptoquark at 384 GeV for β = 1, which is the most stringent direct limit to date.
