Measurement of the high-mass Drell-Yan differential cross-section in pp collisions at s=7TeV with the ATLAS detector

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 725:4-5 (2013) 223-242

Authors:

G Aad, T Abajyan, B Abbott, J Abdallah, S Abdel Khalek, AA Abdelalim, O Abdinov, R Aben, B Abi, M Abolins, OS Abou Zeid, H Abramowicz, H Abreu, Y Abulaiti, BS Acharya, L Adamczyk, DL Adams, TN Addy, J Adelman, S Adomeit, T Adye, S Aefsky, JA Aguilar-Saavedra, M Agustoni, SP Ahlen, F Ahles, A Ahmad, M Ahsan, G Aielli, TPA Åkesson, G Akimoto, AV Akimov, MA Alam, J Albert, S Albrand, MJ Alconada Verzini, M Aleksa, IN Aleksandrov, F Alessandria, C Alexa, G Alexander, G Alexandre, T Alexopoulos, M Alhroob, M Aliev, G Alimonti, J Alison, BMM Allbrooke, LJ Allison, PP Allport, SE Allwood-Spiers, J Almond, A Aloisio, R Alon, A Alonso, F Alonso, A Altheimer, B Alvarez Gonzalez, MG Alviggi, K Amako, Y Amaral Coutinho, C Amelung, VV Ammosov, SP Amor Dos Santos, A Amorim, S Amoroso, N Amram, C Anastopoulos, LS Ancu, N Andari, T Andeen, CF Anders, G Anders, KJ Anderson, A Andreazza, V Andrei, 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

Abstract:

© 2013 CERN. This Letter reports a measurement of the high-mass Drell-Yan differential cross-section in proton-proton collisions at a centre-of-mass energy of 7 TeV at the LHC. Based on an integrated luminosity of 4.9fb -1 , the differential cross-section in the Z/γ * →e + e - channel is measured with the ATLAS detector as a function of the invariant mass, m ee , in the range 116 < m ee < 1500GeV, for a fiducial region in which both the electron and the positron have transverse momentum p T > 25GeV and pseudorapidity |η| < 2.5. A comparison is made to various event generators and to the predictions of perturbative QCD calculations at next-to-next-to-leading order.

Search for gluino mediated bottom- and top-squark production in multijet final states in pp collisions at 8 TeV

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 725:4-5 (2013) 243-270

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, N Hörmann, J Hrubec, M Jeitler, W Kiesenhofer, V Knünz, M Krammer, I Krätschmer, D Liko, I Mikulec, D Rabady, B Rahbaran, C Rohringer, H Rohringer, R Schöfbeck, J Strauss, A Taurok, W Treberer-Treberspurg, W Waltenberger, CE Wulz, V Mossolov, N Shumeiko, J Suarez Gonzalez, S Alderweireldt, M Bansal, S Bansal, T Cornelis, EA De Wolf, X Janssen, A Knutsson, S Luyckx, L Mucibello, S Ochesanu, B Roland, R Rougny, Z Staykova, H Van Haevermaet, P Van Mechelen, N Van Remortel, A Van Spilbeeck, F Blekman, S Blyweert, J D'Hondt, A Kalogeropoulos, J Keaveney, M Maes, A Olbrechts, S Tavernier, W Van Doninck, P Van Mulders, GP Van Onsem, I Villella, B Clerbaux, G De Lentdecker, L Favart, APR Gay, T Hreus, A Léonard, PE Marage, A Mohammadi, L Perniè, T Reis, T Seva, L Thomas, C Vander Velde, P Vanlaer, J Wang, V Adler, K Beernaert, L Benucci, A Cimmino, S Costantini, S Dildick, G Garcia, B Klein, J Lellouch, A Marinov, J Mccartin, AA Ocampo Rios, D Ryckbosch, M Sigamani, N Strobbe, F Thyssen, M Tytgat, S Walsh, E Yazgan, N Zaganidis, S Basegmez, C Beluffi

Abstract:

A search for supersymmetry is presented based on events with large missing transverse energy, no isolated electron or muon, and at least three jets with one or more identified as a bottom-quark jet. A simultaneous examination is performed of the numbers of events in exclusive bins of the scalar sum of jet transverse momentum values, missing transverse energy, and bottom-quark jet multiplicity. The sample, corresponding to an integrated luminosity of 19.4fb-1, consists of proton-proton collision data recorded at a center-of-mass energy of 8TeV with the CMS detector at the LHC in 2012. The observed numbers of events are found to be consistent with the standard model expectation, which is evaluated with control samples in data. The results are interpreted in the context of two simplified supersymmetric scenarios in which gluino pair production is followed by the decay of each gluino to an undetected lightest supersymmetric particle and either a bottom or top quark-antiquark pair, characteristic of gluino mediated bottom- or top-squark production. Using the production cross section calculated to next-to-leading-order plus next-to-leading-logarithm accuracy, and in the limit of a massless lightest supersymmetric particle, we exclude gluinos with masses below 1170GeV and 1020GeV for the two scenarios, respectively. © 2013 CERN.

Search for microscopic black holes in a like-sign dimuon final state using large track multiplicity with the ATLAS detector

Physical Review D - Particles, Fields, Gravitation and Cosmology 88:7 (2013)

Authors:

G Aad, T Abajyan, B Abbott, J Abdallah, S Abdel Khalek, O Abdinov, R Aben, B Abi, M Abolins, OS Abouzeid, H Abramowicz, H Abreu, Y Abulaiti, BS Acharya, L Adamczyk, DL Adams, TN Addy, J Adelman, S Adomeit, T Adye, S Aefsky, T Agatonovic-Jovin, JA Aguilar-Saavedra, M Agustoni, SP Ahlen, A Ahmad, F Ahmadov, M Ahsan, G Aielli, TPA Åkesson, G Akimoto, AV Akimov, MA Alam, J Albert, S Albrand, MJ Alconada Verzini, M Aleksa, IN Aleksandrov, F Alessandria, C Alexa, G Alexander, G Alexandre, T Alexopoulos, M Alhroob, M Aliev, G Alimonti, L Alio, J Alison, BMM Allbrooke, LJ Allison, PP Allport, SE Allwood-Spiers, J Almond, A Aloisio, R Alon, A Alonso, F Alonso, A Altheimer, B Alvarez Gonzalez, MG Alviggi, K Amako, Y Amaral Coutinho, C Amelung, VV Ammosov, SP Amor Dos Santos, A Amorim, S Amoroso, N Amram, C Anastopoulos, LS Ancu, N Andari, T Andeen, CF Anders, G Anders, KJ Anderson, A Andreazza, V Andrei, XS Anduaga, S Angelidakis, P Anger, A Angerami, F Anghinolfi, AV Anisenkov, N Anjos, A Annovi, A Antonaki, M Antonelli, A Antonov, J Antos, F Anulli, M Aoki, L Aperio Bella, R Apolle, G Arabidze, I Aracena, Y Arai, ATH Arce, S Arfaoui, JF Arguin, S Argyropoulos

Abstract:

A search is presented for microscopic black holes in a like-sign dimuon final state in proton-proton collisions at √s=8 TeV. The data were collected with the ATLAS detector at the Large Hadron Collider in 2012 and correspond to an integrated luminosity of 20.3 fb-1. Using a high track multiplicity requirement, 0.6±0.2 background events from Standard Model processes are predicted and none observed. This result is interpreted in the context of low-scale gravity models and 95% C.L. lower limits on microscopic black hole masses are set for different model assumptions. © 2013 CERN. Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Measurement of the WW cross section in pp collisions at {Mathematical expression} and limits on anomalous WW γ and WWZ couplings

European Physical Journal C 73:10 (2013) 1-22

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, N Hörmann, J Hrubec, M Jeitler, W Kiesenhofer, V Knünz, M Krammer, I Krätschmer, D Liko, I Mikulec, D Rabady, B Rahbaran, C Rohringer, H Rohringer, R Schöfbeck, J Strauss, A Taurok, W Treberer-Treberspurg, W Waltenberger, C-E Wulz, V Mossolov, N Shumeiko, J Suarez Gonzalez, S Alderweireldt, M Bansal, S Bansal, T Cornelis, EA De Wolf, X Janssen, A Knutsson, S Luyckx, L Mucibello, S Ochesanu, B Roland, R Rougny, H Van Haevermaet, P Van Mechelen, N Van Remortel, A Van Spilbeeck, F Blekman, S Blyweert, J D'Hondt, A Kalogeropoulos, J Keaveney, M Maes, A Olbrechts, S Tavernier, W Van Doninck, P Van Mulders, GP Van Onsem, I Villella, B Clerbaux, G De Lentdecker, L Favart, APR Gay, T Hreus, A Léonard, PE Marage, A Mohammadi, L Perniè, T Reis, T Seva, L Thomas, C Vander Velde, P Vanlaer, J Wang, V Adler, K Beernaert, L Benucci, A Cimmino, S Costantini, S Dildick, G Garcia, B Klein, J Lellouch, A Marinov, J Mccartin, AA Ocampo Rios, D Ryckbosch, M Sigamani, N Strobbe, F Thyssen, M Tytgat, S Walsh, E Yazgan, N Zaganidis, S Basegmez, C Beluffi, 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, A Pin, K Piotrzkowski, A Popov, M Selvaggi, JM Vizan Garcia, N Beliy, T Caebergs, E Daubie, GH Hammad, GA Alves, M Correa Martins Junior, T Martins, ME Pol, MHG Souza, WL Aldá Júnior, W Carvalho, J Chinellato, A Custódio, EM Da Costa, D De Jesus Damiao, C De Oliveira Martins, S Fonseca De Souza, H Malbouisson, M Malek, D Matos Figueiredo, L Mundim, H Nogima, WL Prado Da Silva, A Santoro, L Soares Jorge, A Sznajder, EJ Tonelli Manganote, A Vilela Pereira, FA Dias, TR Fernandez Perez Tomei, C Lagana, F Marinho, SF Novaes, SS Padula, TS Anjos, CA Bernardes, EM Gregores, PG Mercadante, V Genchev, P Iaydjiev, S Piperov, M Rodozov, G Sultanov, 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, X Wang, Z Wang, H Xiao, M Xu, C Asawatangtrakuldee, Y Ban, Y Guo, Q Li, W Li, S Liu, Y Mao, SJ Qian, D Wang, L Zhang, W Zou, C Avila, CA Carrillo Montoya, JP Gomez, B Gomez Moreno, JC Sanabria, N Godinovic, D Lelas, R Plestina, D Polic, I Puljak, Z Antunovic, M Kovac, V Brigljevic, S Duric, K Kadija, J Luetic, D Mekterovic, S Morovic, L Tikvica, A Attikis, G Mavromanolakis, J Mousa, C Nicolaou, F Ptochos, PA Razis, M Finger, M Finger Jr, Y Assran, A Ellithi Kamel, MA Mahmoud, A Mahrous, A Radi, M Kadastik, M Müntel, M Murumaa, M Raidal, L Rebane, A Tiko, P Eerola, G Fedi, M Voutilainen, J Härkönen, 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, L Wendland, A Korpela, T Tuuva, M Besancon, S Choudhury, F Couderc, 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, M Titov, S Baffioni, F Beaudette, L Benhabib, L Bianchini, M Bluj, P Busson, C Charlot, N Daci, T Dahms, M Dalchenko, L Dobrzynski, A Florent, R Granier de Cassagnac, M Haguenauer, P Miné, C Mironov, IN Naranjo, 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, EC Chabert, C Collard, E Conte, F Drouhin, J-C Fontaine, D Gelé, U Goerlach, C Goetzmann, P Juillot, A-C Le Bihan, P Van Hove, S Gadrat, S Beauceron, N Beaupere, G Boudoul, S Brochet, 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, L Sgandurra, V Sordini, Y Tschudi, M Vander Donckt, P Verdier, S Viret, Z Tsamalaidze, C Autermann, S Beranek, B Calpas, M Edelhoff, L Feld, N Heracleous, O Hindrichs, 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, M Merschmeyer, A Meyer, M Olschewski, K Padeken, P Papacz, H Pieta, H Reithler, SA Schmitz, L Sonnenschein, J Steggemann, D Teyssier, S Thüer, M Weber, V Cherepanov, Y Erdogan, G Flügge, H Geenen, M Geisler, W Haj Ahmad, F Hoehle, B Kargoll, T Kress, Y Kuessel, J Lingemann, A Nowack, IM Nugent, L Perchalla, O Pooth, A Stahl, M Aldaya Martin, I Asin, N Bartosik, J Behr, W Behrenhoff, U Behrens, M Bergholz, A Bethani, K Borras, A Burgmeier, A Cakir, L Calligaris, A Campbell, F Costanza, C Diez Pardos, T Dorland, 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, M Krämer, D Krücker, E Kuznetsova, W Lange, J Leonard, K Lipka, W Lohmann, B Lutz, R Mankel, I Marfin, I-A Melzer-Pellmann, AB Meyer, J Mnich, A Mussgiller, S Naumann-Emme, O Novgorodova, F Nowak, J Olzem, H Perrey, A Petrukhin, D Pitzl, R Placakyte, A Raspereza, PM Ribeiro Cipriano, C Riedl, E Ron, MO Sahin, J Salfeld-Nebgen, R Schmidt, T Schoerner-Sadenius, N Sen, M Stein, R Walsh, C Wissing, V Blobel, H Enderle, J Erfle, U Gebbert, M Görner, M Gosselink, J Haller, K Heine, RS Höing, G Kaussen, H Kirschenmann, R Klanner, R Kogler, J Lange, T Peiffer, N Pietsch, D Rathjens, C Sander, H Schettler, P Schleper, E Schlieckau, A Schmidt, M Schröder, T Schum, M Seidel, J Sibille, V Sola, H Stadie, G Steinbrück, J Thomsen, D Troendle, L Vanelderen, C Barth, C Baus, 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, U Husemann, I Katkov, JR Komaragiri, A Kornmayer, P Lobelle Pardo, D Martschei, S Mueller, Th Müller, M Niegel, A Nürnberg, O Oberst, J Ott, G Quast, K Rabbertz, F Ratnikov, S Röcker, F-P Schilling, G Schott, HJ Simonis, FM Stober, R Ulrich, J Wagner-Kuhr, S Wayand, T Weiler, M Zeise, G Anagnostou, G Daskalakis, T Geralis, S Kesisoglou, A Kyriakis, D Loukas, A Markou, C Markou, E Ntomari, L Gouskos, TJ Mertzimekis, A Panagiotou, N Saoulidou, E Stiliaris, X Aslanoglou, I Evangelou, G Flouris, C Foudas, P Kokkas, N Manthos, I Papadopoulos, E Paradas, G Bencze, C Hajdu, P Hidas, D Horvath, B Radics, F Sikler, V Veszpremi, G Vesztergombi, AJ Zsigmond, N Beni, S Czellar, J Molnar, J Palinkas, Z Szillasi, J Karancsi, P Raics, ZL Trocsanyi, B Ujvari, SK Swain, SB Beri, V Bhatnagar, N Dhingra, R Gupta, M Kaur, MZ Mehta, M Mittal, N Nishu, LK Saini, A Sharma, JB Singh, A Kumar, S Ahuja, A Bhardwaj, BC Choudhary, S Malhotra, M Naimuddin, K Ranjan, P Saxena, V Sharma, RK Shivpuri, S Banerjee, S Bhattacharya, K Chatterjee, S Dutta, B Gomber, Sa Jain, Sh Jain, R Khurana, A Modak, S Mukherjee, D Roy, S Sarkar, M Sharan, A Abdulsalam, D Dutta, S Kailas, V Kumar, AK Mohanty, LM Pant, P Shukla, A Topkar, T Aziz, RM Chatterjee, S Ganguly, S Ghosh, M Guchait, A Gurtu, G Kole, S Kumar, M Maity, G Majumder, K Mazumdar, GB Mohanty, B Parida, K Sudhakar, N Wickramage, S Dugad, H Arfaei, H Bakhshiansohi, SM Etesami, A Fahim, H Hesari, A Jafari, M Khakzad, M Mohammadi Najafabadi, S Paktinat Mehdiabadi, B Safarzadeh, M Zeinali, M Grunewald, M Abbrescia, L Barbone, C Calabria, SS Chhibra, A Colaleo, D Creanza, N De Filippis, M De Palma, L Fiore, G Iaselli, G Maggi, M Maggi, B Marangelli, S My, S Nuzzo, N Pacifico, A Pompili, G Pugliese, G Selvaggi, L Silvestris, G Singh, R Venditti, P Verwilligen, G Zito, G Abbiendi, AC Benvenuti, D Bonacorsi, S Braibant-Giacomelli, L Brigliadori, R Campanini, 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, GP Siroli, N Tosi, R Travaglini, S Albergo, M Chiorboli, S Costa, F Giordano, R Potenza, A Tricomi, C Tuve, G Barbagli, V Ciulli, C Civinini, R D'Alessandro, E Focardi, S Frosali, E Gallo, S Gonzi, V Gori, P Lenzi, M Meschini, S Paoletti, G Sguazzoni, A Tropiano, L Benussi, S Bianco, D Piccolo, P Fabbricatore, R Musenich, S Tosi, A Benaglia, F De Guio, L Di Matteo, S Fiorendi, S Gennai, A Ghezzi, P Govoni, MT Lucchini, S Malvezzi, RA Manzoni, A Martelli, A Massironi, D Menasce, L Moroni, M Paganoni, D Pedrini, S Ragazzi, N Redaelli, T Tabarelli de Fatis, S Buontempo, N Cavallo, A De Cosa, F Fabozzi, AOM Iorio, L Lista, S Meola, M Merola, P Paolucci, P Azzi, N Bacchetta, P Bellan, D Bisello, A Branca, R Carlin, P Checchia, T Dorigo, M Galanti, F Gasparini, U Gasparini, P Giubilato, F Gonella, A Gozzelino, K Kanishchev, S Lacaprara, I Lazzizzera, M Margoni, AT Meneguzzo, F Montecassiano, M Passaseo, J Pazzini, N Pozzobon, P Ronchese, F Simonetto, E Torassa, M Tosi, S Vanini, P Zotto, G Zumerle, M Gabusi, SP Ratti, C Riccardi, P Vitulo, M Biasini, GM Bilei, L Fanò, P Lariccia, G Mantovani, M Menichelli, A Nappi, F Romeo, A Saha, A Santocchia, A Spiezia, K Androsov, 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, C Vernieri, L Barone, F Cavallari, D Del Re, M Diemoz, C Fanelli, M Grassi, E Longo, F Margaroli, P Meridiani, F Micheli, S Nourbakhsh, G Organtini, R Paramatti, S Rahatlou, L Soffi, N Amapane, R Arcidiacono, S Argiro, M Arneodo, C Biino, N Cartiglia, S Casasso, M Costa, G Dellacasa, N Demaria, C Mariotti, S Maselli, E Migliore, V Monaco, M Musich, MM Obertino, N Pastrone, M Pelliccioni, A Potenza, A Romero, M Ruspa, R Sacchi, A Solano, A Staiano, U Tamponi, S Belforte, V Candelise, M Casarsa, F Cossutti, G Della Ricca, B Gobbo, C La Licata, M Marone, D Montanino, A Penzo, A Schizzi, A Zanetti, TY Kim, SK Nam, S Chang, DH Kim, GN Kim, JE Kim, DJ Kong, YD Oh, H Park, DC Son, JY Kim, ZJ Kim, S Song, S Choi, D Gyun, B Hong, M Jo, H Kim, TJ Kim, KS Lee, SK Park, Y Roh, M Choi, JH Kim, C Park, IC Park, S Park, G Ryu, Y Choi, YK Choi, J Goh, MS Kim, E Kwon, B Lee, J Lee, S Lee, H Seo, I Yu, I Grigelionis, A Juodagalvis, H Castilla-Valdez, E De La Cruz-Burelo, I Heredia-de La Cruz, R Lopez-Fernandez, J Martínez-Ortega, A Sanchez-Hernandez, LM Villasenor-Cendejas, S Carrillo Moreno, F Vazquez Valencia, HA Salazar Ibarguen, E Casimiro Linares, A Morelos Pineda, MA Reyes-Santos, D Krofcheck, AJ Bell, PH Butler, R Doesburg, S Reucroft, H Silverwood, M Ahmad, MI Asghar, J Butt, HR Hoorani, S Khalid, WA Khan, T Khurshid, S Qazi, MA Shah, M Shoaib, H Bialkowska, B Boimska, T Frueboes, M Górski, M Kazana, K Nawrocki, K Romanowska-Rybinska, M Szleper, G Wrochna, P Zalewski, G Brona, K Bunkowski, M Cwiok, W Dominik, K 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Montalvo, I Osipenkov, Y Pakhotin, A Perloff, J Roe, A Safonov, T Sakuma, I Suarez, A Tatarinov, D Toback, N Akchurin, J Damgov, C Dragoiu, PR Dudero, C Jeong, K Kovitanggoon, SW Lee, T Libeiro, I Volobouev, E Appelt, AG Delannoy, S Greene, A Gurrola, W Johns, C Maguire, A Melo, M Sharma, P Sheldon, B Snook, S Tuo, J Velkovska, MW Arenton, S Boutle, B Cox, B Francis, J Goodell, R Hirosky, A Ledovskoy, C Lin, C Neu, J Wood, S Gollapinni, R Harr, PE Karchin, C Kottachchi Kankanamge Don, P Lamichhane, A Sakharov, M Anderson, DA Belknap, L Borrello, D Carlsmith, M Cepeda, S Dasu, E Friis, KS Grogg, M Grothe, R Hall-Wilton, M Herndon, A Hervé, K Kaadze, P Klabbers, J Klukas, A Lanaro, C Lazaridis, R Loveless, A Mohapatra, MU Mozer, I Ojalvo, GA Pierro, I Ross, A Savin, WH Smith, J Swanson

Abstract:

A measurement of WW production in pp collisions at {Mathematical expression} is presented. The data were collected with the CMS detector at the LHC, and correspond to an integrated luminosity of 4.92±0.11 fb. The WW candidates consist of two oppositely charged leptons, electrons or muons, accompanied by large missing transverse energy. The WW production cross section is measured to be 52.4±2.0 (stat.)±4.5 (syst.)±1.2 (lum.) pb. This measurement is consistent with the standard model prediction of 47.0±2.0 pb at next-to-leading order. Stringent limits on the WW γ and WWZ anomalous triple gauge-boson couplings are set. © 2013 CERN for the benefit of the CMS collaboration .

Slowly fading super-luminous supernovae that are not pair-instability explosions.

Nature 502:7471 (2013) 346-349

Authors:

M Nicholl, SJ Smartt, A Jerkstrand, C Inserra, M McCrum, R Kotak, M Fraser, D Wright, T-W Chen, K Smith, DR Young, SA Sim, S Valenti, DA Howell, F Bresolin, RP Kudritzki, JL Tonry, ME Huber, A Rest, A Pastorello, L Tomasella, E Cappellaro, S Benetti, S Mattila, E Kankare, T Kangas, G Leloudas, J Sollerman, F Taddia, E Berger, R Chornock, G Narayan, CW Stubbs, RJ Foley, R Lunnan, A Soderberg, N Sanders, D Milisavljevic, R Margutti, RP Kirshner, N Elias-Rosa, A Morales-Garoffolo, S Taubenberger, MT Botticella, S Gezari, Y Urata, S Rodney, AG Riess, D Scolnic, WM Wood-Vasey, WS Burgett, K Chambers, HA Flewelling, EA Magnier, N Kaiser, N Metcalfe, J Morgan, PA Price, W Sweeney, C Waters

Abstract:

Super-luminous supernovae that radiate more than 10(44) ergs per second at their peak luminosity have recently been discovered in faint galaxies at redshifts of 0.1-4. Some evolve slowly, resembling models of 'pair-instability' supernovae. Such models involve stars with original masses 140-260 times that of the Sun that now have carbon-oxygen cores of 65-130 solar masses. In these stars, the photons that prevent gravitational collapse are converted to electron-positron pairs, causing rapid contraction and thermonuclear explosions. Many solar masses of (56)Ni are synthesized; this isotope decays to (56)Fe via (56)Co, powering bright light curves. Such massive progenitors are expected to have formed from metal-poor gas in the early Universe. Recently, supernova 2007bi in a galaxy at redshift 0.127 (about 12 billion years after the Big Bang) with a metallicity one-third that of the Sun was observed to look like a fading pair-instability supernova. Here we report observations of two slow-to-fade super-luminous supernovae that show relatively fast rise times and blue colours, which are incompatible with pair-instability models. Their late-time light-curve and spectral similarities to supernova 2007bi call the nature of that event into question. Our early spectra closely resemble typical fast-declining super-luminous supernovae, which are not powered by radioactivity. Modelling our observations with 10-16 solar masses of magnetar-energized ejecta demonstrates the possibility of a common explosion mechanism. The lack of unambiguous nearby pair-instability events suggests that their local rate of occurrence is less than 6 × 10(-6) times that of the core-collapse rate.