Search for a light pseudoscalar Higgs boson in the dimuon decay channel in pp collisions at √s = 7 TeV.

Phys Rev Lett 109:12 (2012) 121801

Authors:

S Chatrchyan, V Khachatryan, AM Sirunyan, A Tumasyan, W Adam, T Bergauer, M Dragicevic, J Erö, C Fabjan, M Friedl, R Frühwirth, VM Ghete, J Hammer, N Hörmann, J Hrubec, M Jeitler, W Kiesenhofer, V Knünz, M Krammer, D Liko, I Mikulec, M Pernicka, B Rahbaran, C Rohringer, H Rohringer, R Schöfbeck, J Strauss, A Taurok, P Wagner, W Waltenberger, G Walzel, E Widl, C-E Wulz, V Mossolov, N Shumeiko, J Suarez Gonzalez, S Bansal, T Cornelis, EA De Wolf, X Janssen, S Luyckx, T Maes, L Mucibello, S Ochesanu, B Roland, R Rougny, M Selvaggi, Z Staykova, H Van Haevermaet, P Van Mechelen, N Van Remortel, A Van Spilbeeck, F Blekman, S Blyweert, J D'Hondt, R Gonzalez Suarez, A Kalogeropoulos, M Maes, A Olbrechts, W Van Doninck, P Van Mulders, GP Van Onsem, I Villella, B Clerbaux, G De Lentdecker, V Dero, APR Gay, T Hreus, A Léonard, PE Marage, T Reis, L Thomas, C Van der Velde, P Vanlaer, J Wang, V Adler, K Beernaert, A Cimmino, S Costantini, G Garcia, M Grunewald, B Klein, J Lellouch, A Marinov, J McCartin, AA Ocampo Rios, D Ryckbosch, N Strobbe, F Thyssen, M Tytgat, L Vanelderen, P Verwilligen, S Walsh, E Yazgan, N Zaganidis, S Basegmez, G Bruno, R Castello, A Caudron, L Ceard, C Delaere, T du Pree, D Favart, L Forthomme, A Giammanco, J Hollar, V Lemaitre, J Liao, O Militaru, C Nuttens, D Pagano, L Perrini, A Pin, K Piotrzkowski, N Schul, JM Vizan Garcia, N Beliy, T Caebergs, E Daubie, GH Hammad, GA Alves, M Correa Martins Junior, D De Jesus Damiao, T Martins, ME Pol, MHG Souza, WL Aldá Júnior, W Carvalho, A Custódio, EM Da Costa, C De Oliveira Martins, S Fonseca De Souza, D Matos Figueiredo, L Mundim, H Nogima, V Oguri, WL Prado Da Silva, A Santoro, L Soares Jorge, A Sznajder, CA Bernardes, FA Dias, TR Fernandez Perez Tomei, EM Gregores, C Lagana, F Marinho, PG Mercadante, SF Novaes, Sandra S Padula, V Genchev, P Iaydjiev, S Piperov, M Rodozov, S Stoykova, G Sultanov, V Tcholakov, R Trayanov, M Vutova, A Dimitrov, R Hadjiiska, V Kozhuharov, L Litov, B Pavlov, P Petkov, JG Bian, GM Chen, HS Chen, CH Jiang, D Liang, S Liang, X Meng, J Tao, J Wang, X Wang, Z Wang, H Xiao, M Xu, J Zang, Z Zhang, C Asawatangtrakuldee, Y Ban, S Guo, Y Guo, W Li, S Liu, Y Mao, SJ Qian, H Teng, S Wang, B Zhu, W Zou, C Avila, JP Gomez, B Gomez Moreno, AF Osorio Oliveros, JC Sanabria, N Godinovic, D Lelas, R Plestina, D Polic, I Puljak, Z Antunovic, M Kovac, V Brigljevic, S Duric, K Kadija, J Luetic, S Morovic, A Attikis, M Galanti, G Mavromanolakis, J Mousa, C Nicolaou, F Ptochos, PA Razis, M Finger, M Finger, Y Assran, S Elgammal, A Ellithi Kamel, S Khalil, MA Mahmoud, A Radi, M Kadastik, M Müntel, M Raidal, L Rebane, A Tiko, V Azzolini, P Eerola, G Fedi, M Voutilainen, J Härkönen, A Heikkinen, V Karimäki, R Kinnunen, MJ Kortelainen, T Lampén, K Lassila-Perini, S Lehti, T Lindén, P Luukka, T Mäenpää, T Peltola, E Tuominen, J Tuominiemi, E Tuovinen, D Ungaro, L Wendland, K Banzuzi, A Karjalainen, A Korpela, T Tuuva, M Besancon, S Choudhury, M Dejardin, D Denegri, B Fabbro, JL Faure, F Ferri, S Ganjour, A Givernaud, P Gras, G Hamel de Monchenault, P Jarry, E Locci, J Malcles, L Millischer, A Nayak, J Rander, A Rosowsky, I Shreyber, M Titov, S Baffioni, F Beaudette, L Benhabib, L Bianchini, M Bluj, C Broutin, P Busson, C Charlot, N Daci, T Dahms, L Dobrzynski, R Granier de Cassagnac, M Haguenauer, P Miné, C Mironov, M Nguyen, C Ochando, P Paganini, D Sabes, R Salerno, Y Sirois, C Veelken, A Zabi, J-L Agram, J Andrea, 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, P Juillot, A-C Le Bihan, P Van Hove, F Fassi, D Mercier, S Beauceron, N Beaupere, O 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, Z Tsamalaidze, G Anagnostou, S Beranek, M Edelhoff, L Feld, N Heracleous, O Hindrichs, R Jussen, K Klein, J Merz, A Ostapchuk, A Perieanu, F Raupach, J Sammet, S Schael, D Sprenger, H Weber, B Wittmer, V Zhukov, M Ata, J Caudron, E Dietz-Laursonn, D Duchardt, M Erdmann, R Fischer, A Güth, T Hebbeker, C Heidemann, K Hoepfner, D Klingebiel, P Kreuzer, J Lingemann, C Magass, M Merschmeyer, A Meyer, M Olschewski, P Papacz, H Pieta, H Reithler, SA Schmitz, L Sonnenschein, J Steggemann, D Teyssier, M Weber, M Bontenackels, V Cherepanov, G Flügge, H Geenen, M Geisler, W Haj Ahmad, F Hoehle, B Kargoll, T Kress, Y Kuessel, A Nowack, L Perchalla, O Pooth, J Rennefeld, P Sauerland, A Stahl, M Aldaya Martin, J Behr, W Behrenhoff, U Behrens, M Bergholz, A Bethani, K Borras, A Burgmeier, A Cakir, L Calligaris, A Campbell, E Castro, F Costanza, D Dammann, C Diez Pardos, G Eckerlin, D Eckstein, G Flucke, A Geiser, I Glushkov, P Gunnellini, S Habib, J Hauk, G Hellwig, H Jung, M Kasemann, P Katsas, C Kleinwort, H Kluge, A Knutsson, M Krämer, D Krücker, E Kuznetsova, W Lange, W Lohmann, B Lutz, R Mankel, I Marfin, M Marienfeld, I-A Melzer-Pellmann, AB Meyer, J Mnich, A Mussgiller, S Naumann-Emme, J Olzem, H Perrey, A Petrukhin, D Pitzl, A Raspereza, PM Ribeiro Cipriano, C Riedl, E Ron, M Rosin, J Salfeld-Nebgen, R Schmidt, T Schoerner-Sadenius, N Sen, A Spiridonov, M Stein, R Walsh, C Wissing, C Autermann, V Blobel, S Bobrovskyi, J Draeger, H Enderle, J Erfle, U Gebbert, M Görner, T Hermanns, RS Höing, K Kaschube, G Kaussen, H Kirschenmann, R Klanner, J Lange, B Mura, F Nowak, T Peiffer, N Pietsch, D Rathjens, C Sander, H Schettler, P Schleper, E Schlieckau, A Schmidt, M Schröder, T Schum, M Seidel, H Stadie, G Steinbrück, J Thomsen, C Barth, J Berger, C Böser, T Chwalek, W De Boer, A Descroix, A Dierlamm, M Feindt, M Guthoff, C Hackstein, F Hartmann, T Hauth, M Heinrich, H Held, KH Hoffmann, S Honc, I Katkov, JR Komaragiri, D Martschei, S Mueller, Th Müller, M Niegel, A Nürnberg, O Oberst, A Oehler, J Ott, G Quast, K Rabbertz, F Ratnikov, N Ratnikova, S Röcker, A Scheurer, F-P Schilling, G Schott, HJ Simonis, FM Stober, D Troendle, R Ulrich, J Wagner-Kuhr, S Wayand, T Weiler, M Zeise, G Daskalakis, T Geralis, S Kesisoglou, A Kyriakis, D Loukas, I Manolakos, A Markou, C Markou, C Mavrommatis, E Ntomari, L Gouskos, TJ Mertzimekis, A Panagiotou, N Saoulidou, I Evangelou, C Foudas, P Kokkas, N Manthos, I Papadopoulos, V 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, J Karancsi, P Raics, ZL Trocsanyi, B Ujvari, SB Beri, V Bhatnagar, N Dhingra, R Gupta, M Jindal, M Kaur, MZ Mehta, N Nishu, LK Saini, A Sharma, J Singh, Ashok Kumar, Arun Kumar, S Ahuja, A Bhardwaj, BC Choudhary, S Malhotra, M Naimuddin, K Ranjan, V Sharma, RK Shivpuri, S Banerjee, S Bhattacharya, S Dutta, B Gomber, Sa Jain, Sh Jain, R Khurana, S Sarkar, M Sharan, A Abdulsalam, RK Choudhury, D Dutta, S Kailas, V Kumar, P Mehta, AK Mohanty, LM Pant, P Shukla, T Aziz, S Ganguly, M Guchait, M Maity, G Majumder, K Mazumdar, GB Mohanty, B Parida, K Sudhakar, N Wickramage, S Banerjee, S Dugad, 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, SS 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 Singh, R Venditti, 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, C Grandi, L Guiducci, S Marcellini, G Masetti, 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, R Potenza, A Tricomi, C Tuve, G Barbagli, V Ciulli, C Civinini, R D'Alessandro, E Focardi, S Frosali, E Gallo, S Gonzi, 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, S Fiorendi, S Gennai, A Ghezzi, S Malvezzi, RA Manzoni, A Martelli, A Massironi, D Menasce, L Moroni, M Paganoni, D Pedrini, S Ragazzi, N Redaelli, S Sala, T Tabarelli de Fatis, S Buontempo, CA Carrillo Montoya, N Cavallo, A De Cosa, O Dogangun, F Fabozzi, AOM Iorio, L Lista, S Meola, M Merola, P Paolucci, P Azzi, N Bacchetta, D Bisello, A Branca, R Carlin, P Checchia, T Dorigo, F Gasparini, U Gasparini, A Gozzelino, K Kanishchev, S Lacaprara, I Lazzizzera, M Margoni, AT Meneguzzo, J Pazzini, N Pozzobon, P Ronchese, E Torassa, M Tosi, S Vanini, P Zotto, A Zucchetta, G Zumerle, M Gabusi, SP Ratti, C Riccardi, P Torre, P Vitulo, M Biasini, GM Bilei, L Fanò, P Lariccia, A Lucaroni, G Mantovani, M Menichelli, A Nappi, F Romeo, A Saha, A Santocchia, S Taroni, P Azzurri, G Bagliesi, T Boccali, G Broccolo, R Castaldi, RT D'Agnolo, R Dell'orso, F Fiori, L Foà, A Giassi, A Kraan, F Ligabue, T Lomtadze, L Martini, A Messineo, F Palla, A Rizzi, AT Serban, P Spagnolo, P Squillacioti, R Tenchini, G Tonelli, A Venturi, PG Verdini, L Barone, F Cavallari, D Del Re, M Diemoz, M Grassi, E Longo, P Meridiani, F Micheli, S Nourbakhsh, G Organtini, R Paramatti, S Rahatlou, M Sigamani, L Soffi, N Amapane, R Arcidiacono, S Argiro, M Arneodo, C Biino, N Cartiglia, M Costa, N Demaria, A Graziano, C Mariotti, S Maselli, E Migliore, V Monaco, M Musich, MM Obertino, N Pastrone, M Pelliccioni, A Potenza, A Romero, M Ruspa, R Sacchi, V Sola, A Solano, A Staiano, A Vilela Pereira, S Belforte, V Candelise, F Cossutti, G Della Ricca, B Gobbo, M Marone, D Montanino, A Penzo, A Schizzi, SG Heo, TY Kim, SK Nam, S Chang, J Chung, DH Kim, GN Kim, DJ Kong, H Park, SR Ro, DC Son, T Son, JY Kim, Zero J Kim, S Song, S Choi, D Gyun, B Hong, M Jo, H Kim, TJ Kim, KS Lee, DH Moon, SK Park, M Choi, S Kang, JH Kim, C Park, IC 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A Sharma, P Siegrist, P Silva, M Simon, P Sphicas, D Spiga, M Spiropulu, M Stoye, A Tsirou, GI Veres, JR Vlimant, HK Wöhri, SD Worm, WD Zeuner, W Bertl, K Deiters, W Erdmann, K Gabathuler, R Horisberger, Q Ingram, HC Kaestli, S König, D Kotlinski, U Langenegger, F Meier, D Renker, T Rohe, J Sibille, L Bäni, P Bortignon, MA Buchmann, B Casal, N Chanon, A Deisher, G Dissertori, M Dittmar, M Dünser, J Eugster, K Freudenreich, C Grab, D Hits, P Lecomte, W Lustermann, AC Marini, P Martinez Ruiz Del Arbol, N Mohr, F Moortgat, C Nägeli, P Nef, F Nessi-Tedaldi, F Pandolfi, L Pape, F Pauss, M Peruzzi, FJ Ronga, M Rossini, L Sala, AK Sanchez, A Starodumov, B Stieger, M Takahashi, L Tauscher, A Thea, K Theofilatos, D Treille, C Urscheler, R Wallny, HA Weber, L Wehrli, E Aguilo, C Amsler, V Chiochia, S De Visscher, C Favaro, M Ivova Rikova, B Millan Mejias, P Otiougova, P Robmann, H Snoek, S Tupputi, M Verzetti, YH Chang, KH Chen, CM Kuo, SW Li, W Lin, ZK Liu, YJ Lu, D Mekterovic, AP Singh, R 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Laird, G Landsberg, M Luk, M Narain, D Nguyen, M Segala, T Sinthuprasith, T Speer, KV Tsang, R Breedon, G Breto, M Calderon De La Barca Sanchez, S Chauhan, M Chertok, J Conway, R Conway, PT Cox, J Dolen, R Erbacher, M Gardner, J Gunion, R Houtz, W Ko, A Kopecky, R Lander, T Miceli, D Pellett, F Ricci-Tam, B Rutherford, M Searle, J Smith, M Squires, M Tripathi, R Vasquez Sierra, V Andreev, D Cline, R Cousins, J Duris, S Erhan, P Everaerts, C Farrell, J Hauser, M Ignatenko, C Jarvis, C Plager, G Rakness, P Schlein, J Tucker, V Valuev, M Weber, J Babb, R Clare, ME Dinardo, J Ellison, JW Gary, F Giordano, G Hanson, GY Jeng, H Liu, OR Long, A Luthra, H Nguyen, S Paramesvaran, J Sturdy, S Sumowidagdo, R Wilken, S Wimpenny, W Andrews, JG Branson, GB Cerati, S Cittolin, D Evans, F Golf, A Holzner, R Kelley, M Lebourgeois, J Letts, I Macneill, B Mangano, S Padhi, C Palmer, G Petrucciani, M Pieri, M Sani, V Sharma, S Simon, E Sudano, M Tadel, Y Tu, A Vartak, S Wasserbaech, F Würthwein, A Yagil, J Yoo, D Barge, R Bellan, C Campagnari, M D'Alfonso, T Danielson, K Flowers, P Geffert, J Incandela, C Justus, P Kalavase, SA Koay, D Kovalskyi, V Krutelyov, S Lowette, N McColl, V Pavlunin, F Rebassoo, J Ribnik, J Richman, R Rossin, D Stuart, W To, C West, A Apresyan, A Bornheim, Y Chen, E Di Marco, J Duarte, M Gataullin, Y Ma, A Mott, HB Newman, C Rogan, V Timciuc, P Traczyk, J Veverka, R Wilkinson, Y Yang, RY Zhu, B Akgun, R Carroll, T Ferguson, Y Iiyama, DW Jang, YF Liu, M Paulini, H Vogel, I Vorobiev, JP Cumalat, BR Drell, CJ Edelmaier, WT Ford, A Gaz, B Heyburn, E Luiggi Lopez, JG Smith, K Stenson, KA Ulmer, SR Wagner, J Alexander, A Chatterjee, N Eggert, LK Gibbons, B Heltsley, A Khukhunaishvili, B Kreis, N Mirman, G Nicolas Kaufman, JR Patterson, A Ryd, E Salvati, W Sun, WD Teo, J Thom, J Thompson, J Vaughan, Y Weng, L Winstrom, P Wittich, D Winn, S Abdullin, M Albrow, J Anderson, LAT Bauerdick, A Beretvas, J Berryhill, PC Bhat, I Bloch, K Burkett, JN Butler, V Chetluru, HWK Cheung, F Chlebana, VD Elvira, I Fisk, J Freeman, Y Gao, D Green, O Gutsche, J Hanlon, RM Harris, J Hirschauer, B Hooberman, S Jindariani, M Johnson, U Joshi, B Kilminster, B Klima, S Kunori, S Kwan, C Leonidopoulos, D Lincoln, R Lipton, J Lykken, K Maeshima, JM Marraffino, S Maruyama, D Mason, P McBride, K Mishra, S Mrenna, Y Musienko, C Newman-Holmes, V O'Dell, O Prokofyev, E Sexton-Kennedy, S Sharma, WJ Spalding, L Spiegel, P Tan, L Taylor, S Tkaczyk, NV Tran, L Uplegger, EW Vaandering, R Vidal, J Whitmore, W Wu, F Yang, F Yumiceva, JC Yun, D Acosta, P Avery, D Bourilkov, M Chen, S Das, M De Gruttola, GP Di Giovanni, D Dobur, A Drozdetskiy, RD Field, M Fisher, Y Fu, IK Furic, J Gartner, J Hugon, B Kim, J Konigsberg, A Korytov, A Kropivnitskaya, T Kypreos, JF Low, K Matchev, P Milenovic, G Mitselmakher, L Muniz, R Remington, A Rinkevicius, P Sellers, N Skhirtladze, M Snowball, J Yelton, M Zakaria, V Gaultney, LM Lebolo, S Linn, P Markowitz, G Martinez, JL Rodriguez, JR Adams, T Adams, A Askew, J Bochenek, J Chen, B Diamond, SV Gleyzer, J Haas, S Hagopian, V Hagopian, M Jenkins, KF Johnson, H Prosper, V Veeraraghavan, M Weinberg, MM Baarmand, B Dorney, M Hohlmann, H Kalakhety, I Vodopiyanov, MR Adams, IM Anghel, L Apanasevich, Y Bai, VE Bazterra, RR Betts, I Bucinskaite, J Callner, R Cavanaugh, C Dragoiu, O Evdokimov, L Gauthier, CE Gerber, DJ Hofman, S Khalatyan, F Lacroix, M Malek, C O'Brien, C Silkworth, D Strom, N Varelas, U Akgun, EA Albayrak, B Bilki, W Clarida, F Duru, S Griffiths, J-P Merlo, H Mermerkaya, A Mestvirishvili, A Moeller, J Nachtman, CR Newsom, E Norbeck, Y Onel, F Ozok, S Sen, E Tiras, J Wetzel, T Yetkin, K Yi, BA Barnett, B Blumenfeld, S Bolognesi, D Fehling, G Giurgiu, AV Gritsan, ZJ Guo, G Hu, P Maksimovic, S Rappoccio, M Swartz, A Whitbeck, P Baringer, A Bean, G Benelli, O Grachov, RP Kenny Iii, M Murray, D Noonan, S Sanders, R Stringer, G Tinti, JS Wood, V Zhukova, AF Barfuss, T Bolton, I Chakaberia, A Ivanov, S Khalil, M Makouski, Y Maravin, S Shrestha, I Svintradze, J Gronberg, D Lange, D Wright, A Baden, M Boutemeur, B Calvert, SC Eno, JA Gomez, NJ Hadley, RG Kellogg, M Kirn, T Kolberg, Y Lu, M Marionneau, AC Mignerey, K Pedro, A Peterman, A Skuja, J Temple, MB Tonjes, SC Tonwar, E Twedt, G Bauer, J Bendavid, W Busza, E Butz, IA Cali, M Chan, V Dutta, G Gomez Ceballos, M Goncharov, KA Hahn, Y Kim, M Klute, K Krajczar, W Li, PD Luckey, T Ma, S Nahn, C Paus, D Ralph, C Roland, G Roland, M Rudolph, GSF Stephans, F Stöckli, K Sumorok, K Sung, D Velicanu, EA Wenger, R Wolf, B Wyslouch, S Xie, M Yang, Y Yilmaz, AS Yoon, M Zanetti, SI Cooper, B Dahmes, A De Benedetti, G Franzoni, A Gude, SC Kao, K Klapoetke, Y Kubota, J Mans, N Pastika, R Rusack, M Sasseville, A Singovsky, N Tambe, J Turkewitz, LM Cremaldi, R Kroeger, L Perera, R Rahmat, DA Sanders, E Avdeeva, K Bloom, S Bose, J Butt, DR Claes, A Dominguez, M Eads, J Keller, I Kravchenko, J Lazo-Flores, H Malbouisson, S Malik, GR Snow, U Baur, A Godshalk, I Iashvili, S Jain, A Kharchilava, A Kumar, SP Shipkowski, K Smith, G Alverson, E Barberis, D Baumgartel, M Chasco, J Haley, D Nash, D Trocino, D Wood, J Zhang, A Anastassov, A Kubik, N Mucia, N Odell, RA Ofierzynski, B Pollack, A Pozdnyakov, M Schmitt, S Stoynev, M Velasco, S Won, L Antonelli, D Berry, A Brinkerhoff, M Hildreth, C Jessop, DJ Karmgard, J Kolb, K Lannon, W Luo, S Lynch, N Marinelli, DM Morse, T Pearson, R Ruchti, J Slaunwhite, N Valls, M Wayne, M Wolf, B Bylsma, LS Durkin, A Hart, C Hill, R Hughes, K Kotov, TY Ling, D Puigh, M Rodenburg, C Vuosalo, G Williams, BL Winer, N Adam, E Berry, P Elmer, D Gerbaudo, V Halyo, P Hebda, J Hegeman, A Hunt, P Jindal, D Lopes Pegna, P Lujan, D Marlow, T Medvedeva, M Mooney, J Olsen, P Piroué, X Quan, A Raval, B Safdi, H Saka, D Stickland, C Tully, JS Werner, A Zuranski, JG Acosta, E Brownson, XT Huang, A Lopez, H Mendez, S Oliveros, JE Ramirez Vargas, A Zatserklyaniy, E Alagoz, VE Barnes, D Benedetti, G Bolla, D Bortoletto, M De Mattia, A Everett, Z Hu, M Jones, O Koybasi, M Kress, AT Laasanen, N Leonardo, V Maroussov, P Merkel, DH Miller, N Neumeister, I Shipsey, D Silvers, A Svyatkovskiy, M Vidal Marono, HD Yoo, J Zablocki, Y Zheng, S Guragain, N Parashar, A Adair, C Boulahouache, KM Ecklund, FJM Geurts, BP Padley, R Redjimi, J Roberts, J Zabel, B Betchart, A Bodek, YS Chung, R Covarelli, P de Barbaro, R Demina, Y Eshaq, A Garcia-Bellido, P Goldenzweig, J Han, A Harel, DC Miner, D Vishnevskiy, M Zielinski, A Bhatti, R Ciesielski, L Demortier, K Goulianos, G Lungu, S Malik, C Mesropian, S Arora, A Barker, JP Chou, C Contreras-Campana, E Contreras-Campana, D Duggan, D Ferencek, Y Gershtein, R Gray, E Halkiadakis, D Hidas, A Lath, S Panwalkar, M Park, R Patel, V Rekovic, J Robles, K Rose, S Salur, S Schnetzer, C Seitz, S Somalwar, R Stone, S Thomas, G Cerizza, M Hollingsworth, S Spanier, ZC Yang, A York, R Eusebi, W Flanagan, J Gilmore, T Kamon, V Khotilovich, R Montalvo, I Osipenkov, Y Pakhotin, A Perloff, J Roe, A Safonov, T Sakuma, S Sengupta, I Suarez, A Tatarinov, D Toback, N Akchurin, J Damgov, PR Dudero, C Jeong, K Kovitanggoon, SW Lee, T Libeiro, Y Roh, I Volobouev, E Appelt, C Florez, S Greene, A Gurrola, W Johns, C Johnston, P Kurt, C Maguire, A Melo, P Sheldon, B Snook, S Tuo, J Velkovska, MW Arenton, M Balazs, S Boutle, B Cox, B Francis, J Goodell, R Hirosky, A Ledovskoy, C Lin, C Neu, J Wood, R Yohay, S Gollapinni, R Harr, PE Karchin, C Kottachchi Kankanamge Don, P Lamichhane, A Sakharov, M Anderson, M Bachtis, D Belknap, L Borrello, D Carlsmith, M Cepeda, S Dasu, L Gray, KS Grogg, M Grothe, R Hall-Wilton, M Herndon, A Hervé, P Klabbers, J Klukas, A Lanaro, C Lazaridis, J Leonard, R Loveless, A Mohapatra, I Ojalvo, F Palmonari, GA Pierro, I Ross, A Savin, WH Smith, J Swanson, CMS Collaboration

Abstract:

The dimuon invariant mass spectrum is searched in the range between 5.5 and 14 GeV for a light pseudoscalar Higgs boson a, predicted in a number of new physics models, including the next-to-minimal supersymmetric standard model. The data sample used in the search corresponds to an integrated luminosity of 1.3 fb(-1) collected in pp collisions at √s = 7 TeV with the CMS detector at the LHC. No excess is observed above the background predictions and upper limits are set on the cross section times branching fraction σ × B(pp→a→μ(+)μ(-)) in the range of 1.5-7.5 pb. These results improve on existing bounds on the abb coupling for m(a) < m(Υ(1S)) and are the first significant limits for m(a) > m(Υ(3S)). Constraints on the supersymmetric parameter space are presented in the context of the next-to-minimal model.

Search for physics beyond the standard model in events with a Z boson, jets, and missing transverse energy in pp collisions at √s=7 TeV

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 716:2 (2012) 260-284

Authors:

S Chatrchyan, V Khachatryan, AM Sirunyan, A Tumasyan, W Adam, T Bergauer, M Dragicevic, J Erö, C Fabjan, M Friedl, R Frühwirth, VM Ghete, J Hammer, N Hörmann, J Hrubec, M Jeitler, W Kiesenhofer, M Krammer, D Liko, I Mikulec, M Pernicka, B Rahbaran, C Rohringer, H Rohringer, R Schöfbeck, J Strauss, A Taurok, F Teischinger, P Wagner, W Waltenberger, G Walzel, E Widl, CE Wulz, V Mossolov, N Shumeiko, J SuarezGonzalez, S Bansal, K Cerny, T Cornelis, EA DeWolf, X Janssen, S Luyckx, T Maes, L Mucibello, S Ochesanu, B Roland, R Rougny, M Selvaggi, H VanHaevermaet, P VanMechelen, N VanRemortel, A VanSpilbeeck, F Blekman, S Blyweert, J D'Hondt, R GonzalezSuarez, A Kalogeropoulos, M Maes, A Olbrechts, W VanDoninck, P VanMulders, GP VanOnsem, I Villella, O Charaf, B Clerbaux, G DeLentdecker, V Dero, APR Gay, T Hreus, A Léonard, PE Marage, L Thomas, C VanderVelde, P Vanlaer, V Adler, K Beernaert, A Cimmino, S Costantini, G Garcia, M Grunewald, B Klein, J Lellouch, A Marinov, J Mccartin, AA OcampoRios, D Ryckbosch, N Strobbe, F Thyssen, M Tytgat, L Vanelderen, P Verwilligen, S Walsh, E Yazgan, N Zaganidis, S Basegmez, G Bruno, L Ceard, C Delaere, T duPree, D Favart

Abstract:

A search is presented for physics beyond the standard model (BSM) in events with a Z boson, jets, and missing transverse energy (ETmiss). This signature is motivated by BSM physics scenarios, including supersymmetry. The study is performed using a sample of proton-proton collision data collected at √s=7 TeV with the CMS experiment at the LHC, corresponding to an integrated luminosity of 4.98 fb -1. The contributions from the dominant standard model backgrounds are estimated from data using two complementary strategies, the jet-Z balance technique and a method based on modeling ETmiss with data control samples. In the absence of evidence for BSM physics, we set limits on the non-standard-model contributions to event yields in the signal regions and interpret the results in the context of simplified model spectra. Additional information is provided to facilitate tests of other BSM physics models. © 2012 CERN.

Evidence for the associated production of a W boson and a top quark in ATLAS at √s = 7 TeV

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 716:1 (2012) 142-159

Authors:

G Aad, B Abbott, J Abdallah, S Abdel Khalek, AA Abdelalim, O Abdinov, B Abi, M Abolins, OS AbouZeid, H Abramowicz, H Abreu, E Acerbi, E Acerbi, BS Acharya, BS Acharya, L Adamczyk, DL Adams, TN Addy, J Adelman, S Adomeit, P Adragna, T Adye, S Aefsky, JA Aguilar-Saavedra, M Aharrouche, SP Ahlen, F Ahles, A Ahmad, M Ahsan, G Aielli, G Aielli, T Akdogan, TPA Åkesson, G Akimoto, AV Akimov, A Akiyama, MS Alam, MA Alam, J Albert, S Albrand, M Aleksa, IN Aleksandrov, F Alessandria, C Alexa, G Alexander, G Alexandre, T Alexopoulos, M Alhroob, M Alhroob, M Aliev, G Alimonti, J Alison, BMM Allbrooke, PP Allport, SE Allwood-Spiers, J Almond, A Aloisio, A Aloisio, R Alon, A Alonso, B Alvarez Gonzalez, MG Alviggi, MG Alviggi, K Amako, C Amelung, VV Ammosov, A Amorim, N Amram, C Anastopoulos, LS Ancu, N Andari, T Andeen, CF Anders, G Anders, KJ Anderson, A Andreazza, A Andreazza, V Andrei, XS Anduaga, A Angerami, F Anghinolfi, A Anisenkov, N Anjos, A Annovi, A Antonaki, M Antonelli, A Antonov, J Antos, F Anulli, S Aoun, L Aperio Bella, R Apolle, G Arabidze, I Aracena, Y Arai, ATH Arce, S Arfaoui, JF Arguin, E Arik, M Arik

Abstract:

This Letter presents evidence for the associated production of a W boson and a top quark using 2.05 fb-1 of pp collision data at s=7TeV accumulated with the ATLAS detector at the LHC. The analysis is based on the selection of the dileptonic final states with events featuring two isolated leptons, electron or muon, with significant transverse missing momentum and at least one jet. An approach based on boosted decision trees has been developed to improve the discrimination of single top-quark Wt events from background. A template fit to the final classifier distributions is performed to determine the cross-section. The result is incompatible with the background-only hypothesis at the 3.3σ level, the expected sensitivity assuming the Standard Model production rate being 3.4σ. The corresponding cross-section is determined and found to be σWt=16.8±2.9(stat)±4.9(syst)pb, in good agreement with the Standard Model expectation. From this result the CKM matrix element |Vtb|=1.03-0.19+0.16 is derived assuming that the Wt production through |Vts| and |Vtd| is small. © 2012 CERN.

Evidence for the associated production of a W boson and a top quark in ATLAS at √s = 7 TeV

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 716:1 (2012) 142-159

Authors:

G Aad, B Abbott, J Abdallah, S Abdel Khalek, AA Abdelalim, O Abdinov, B Abi, M Abolins, OS AbouZeid, H Abramowicz, H Abreu, E Acerbi, BS Acharya, L Adamczyk, DL Adams, TN Addy, J Adelman, S Adomeit, P Adragna, T Adye, S Aefsky, JA Aguilar-Saavedra, M Aharrouche, SP Ahlen, F Ahles, A Ahmad, M Ahsan, G Aielli, T Akdogan, TPA Åkesson, G Akimoto, AV Akimov, A Akiyama, MS Alam, MA Alam, J Albert, S Albrand, M Aleksa, IN Aleksandrov, F Alessandria, C Alexa, G Alexander, G Alexandre, T Alexopoulos, M Alhroob, M Aliev, G Alimonti, J Alison, BMM Allbrooke, PP Allport, SE Allwood-Spiers, J Almond, A Aloisio, R Alon, A Alonso, B Alvarez Gonzalez, MG Alviggi, K Amako, C Amelung, VV Ammosov, A Amorim, N Amram, C Anastopoulos, LS Ancu, N Andari, T Andeen, CF Anders, G Anders, KJ Anderson, A Andreazza, V Andrei, XS Anduaga, A Angerami, F Anghinolfi, A Anisenkov, N Anjos, A Annovi, A Antonaki, M Antonelli, A Antonov, J Antos, F Anulli, S Aoun, L Aperio Bella, R Apolle, G Arabidze, I Aracena, Y Arai, ATH Arce, S Arfaoui

Abstract:

This Letter presents evidence for the associated production of a W boson and a top quark using 2.05 fb -1 of pp collision data at s=7TeV accumulated with the ATLAS detector at the LHC. The analysis is based on the selection of the dileptonic final states with events featuring two isolated leptons, electron or muon, with significant transverse missing momentum and at least one jet. An approach based on boosted decision trees has been developed to improve the discrimination of single top-quark Wt events from background. A template fit to the final classifier distributions is performed to determine the cross-section. The result is incompatible with the background-only hypothesis at the 3.3σ level, the expected sensitivity assuming the Standard Model production rate being 3.4σ. The corresponding cross-section is determined and found to be σ Wt =16.8±2.9(stat)±4.9(syst)pb, in good agreement with the Standard Model expectation. From this result the CKM matrix element |Vtb|=1.03-0.19+0.16 is derived assuming that the Wt production through |V ts | and |V td | is small. © 2012 CERN.

Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 716:1 (2012) 1-29

Authors:

G Aad, T Abajyan, B Abbott, J Abdallah, S Abdel Khalek, AA Abdelalim, O Abdinov, R Aben, B Abi, M Abolins, OS AbouZeid, H Abramowicz, H Abreu, BS Acharya, L Adamczyk, DL Adams, TN Addy, J Adelman, S Adomeit, P Adragna, T Adye, S Aefsky, JA Aguilar-Saavedra, M Agustoni, M Aharrouche, SP Ahlen, F Ahles, A Ahmad, M Ahsan, G Aielli, T Akdogan, TPA Åkesson, G Akimoto, AV Akimov, MS Alam, MA Alam, J Albert, S Albrand, M Aleksa, IN Aleksandrov, F Alessandria, C Alexa, G Alexander, G Alexandre, T Alexopoulos, M Alhroob, M Aliev, G Alimonti, J Alison, BMM Allbrooke, PP Allport, SE Allwood-Spiers, J Almond, A Aloisio, R Alon, A Alonso, F Alonso, A Altheimer, B Alvarez Gonzalez, MG Alviggi, K Amako, C Amelung, VV Ammosov, SP Amor Dos Santos, A Amorim, N Amram, C Anastopoulos, LS Ancu, N Andari, T Andeen, CF Anders, G Anders, KJ Anderson, A Andreazza, V Andrei, ML Andrieux, XS Anduaga, S Angelidakis, P Anger, A Angerami, F Anghinolfi, A Anisenkov, N Anjos, A Annovi, A Antonaki, M Antonelli, A Antonov, J Antos, F Anulli, M Aoki, S Aoun, L Aperio Bella

Abstract:

© 2012 CERN. Published by Elsevier B.V. A search for the Standard Model Higgs boson in proton-proton collisions with the ATLAS detector at the LHC is presented. The datasets used correspond to integrated luminosities of approximately 4.8 fb -1 collected at √s = 7 TeV in 2011 and 5.8 fb -1 at √s = 8 TeV in 2012. Individual searches in the channels H → ZZ(*) → 4l, H → γγ and H → WW(*) eνμν in the 8 TeV data are combined with previously published results of searches for H → ZZ (*) , WW (*) , bb and τ + τ - in the 7 TeV data and results from improved analyses of the H → ZZ(*) →4l and H → γγ channels in the 7 TeV data. Clear evidence for the production of a neutral boson with a measured mass of 126.0±0.4 (stat)±0.4 (sys) GeV is presented. This observation, which has a significance of 5.9 standard deviations, corresponding to a background fluctuation probability of 1.7×10 -9 , is compatible with the production and decay of the Standard Model Higgs boson.