Accelerator Neutrinos

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Search for a heavy Standard Model Higgs boson in the channel H→ZZ→ℓ+ℓ-qq̄ using the ATLAS detector

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 707:1 (2012) 27-45

Authors:

G Aad, B Abbott, J Abdallah, AA Abdelalim, A Abdesselam, O Abdinov, B Abi, M Abolins, H Abramowicz, H Abreu, E Acerbi, BS Acharya, DL Adams, TN Addy, J Adelman, M Aderholz, 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, M Aliyev, PP Allport, SE Allwood-Spiers, J Almond, A Aloisio, R Alon, A Alonso, MG Alviggi, K Amako, P Amaral, C Amelung, VV Ammosov, A Amorim, G Amorós, 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, A Angerami, F Anghinolfi, 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, JP Archambault, S Arfaoui, JF Arguin, E Arik, M Arik, AJ Armbruster, O Arnaez, C Arnault, A Artamonov, G Artoni

Abstract:

A search for a heavy Standard Model Higgs boson decaying via H→ZZ→ℓ+ℓ-qq̄, where ℓ=e, μ, is presented. The search is performed using a data set of pp collisions at √s=7 TeV, corresponding to an integrated luminosity of 1.04 fb-1 collected in 2011 by the ATLAS detector at the CERN LHC collider. No significant excess of events above the estimated background is found. Upper limits at 95% confidence level on the production cross section (relative to that expected from the Standard Model) of a Higgs boson with a mass in the range between 200 and 600 GeV are derived. Within this mass range, there is at present insufficient sensitivity to exclude a Standard Model Higgs boson. For a Higgs boson with a mass of 360 GeV, where the sensitivity is maximal, the observed and expected cross section upper limits are factors of 1.7 and 2.7, respectively, larger than the Standard Model prediction. © 2011 CERN.
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Search for Lorentz invariance and CPT violation with muon antineutrinos in the MINOS Near Detector

(2012)

Authors:

P Adamson, DS Ayres, G Barr, M Bishai, A Blake, GJ Bock, DJ Boehnlein, D Bogert, SV Cao, S Cavanaugh, S Childress, JAB Coelho, L Corwin, D Cronin-Hennessy, IZ Danko, JK de Jong, NE Devenish, MV Diwan, CO Escobar, JJ Evans, E Falk, GJ Feldman, MV Frohne, HR Gallagher, RA Gomes, MC Goodman, P Gouffon, N Graf, R Gran, K Grzelak, A Habig, J Hartnell, R Hatcher, A Himmel, A Holin, J Hylen, GM Irwin, Z Isvan, C James, D Jensen, T Kafka, SMS Kasahara, G Koizumi, S Kopp, M Kordosky, A Kreymer, K Lang, J Ling, PJ Litchfield, L Loiacono, P Lucas, WA Mann, ML Marshak, M Mathis, N Mayer, R Mehdiyev, JR Meier, MD Messier, WH Miller, SR Mishra, J Mitchell, CD Moore, L Mualem, S Mufson, J Musser, D Naples, JK Nelson, HB Newman, RJ Nichol, JA Nowak, WP Oliver, M Orchanian, RB Pahlka, J Paley, RB Patterson, G Pawloski, S Phan-Budd, RK Plunkett, X Qiu, A Radovic, J Ratchford, B Rebel, C Rosenfeld, HA Rubin, MC Sanchez, J Schneps, A Schreckenberger, P Schreiner, R Sharma, A Sousa, M Strait, N Tagg, RL Talaga, J Thomas, MA Thomson, G Tinti, R Toner, D Torretta, G Tzanakos, J Urheim, P Vahle, B Viren, JJ Walding, A Weber, RC Webb, C White, L Whitehead, SG Wojcicki, R Zwaska
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First Muon-Neutrino Disappearance Study with an Off-Axis Beam

(2012)

Authors:

T2K Collaboration, K Abe, N Abgrall, Y Ajima, H Aihara, JB Albert, C Andreopoulos, B Andrieu, MD Anerella, S Aoki, O Araoka, J Argyriades, A Ariga, T Ariga, S Assylbekov, D Autiero, A Badertscher, M Barbi, GJ Barker, G Barr, M Bass, M Batkiewicz, F Bay, S Bentham, V Berardi, BE Berger, I Bertram, M Besnier, J Beucher, D Beznosko, S Bhadra, FDM Blaszczyk, J Blocki, A Blondel, C Bojechko, J Bouchez, SB Boyd, A Bravar, C Bronner, DG Brook-Roberge, N Buchanan, H Budd, R Calland, D Calvet, J Caravaca Rodriguez, SL Cartwright, A Carver, R Castillo, MG Catanesi, A Cazes, A Cervera, C Chavez, S Choi, G Christodoulou, J Coleman, G Collazuol, W Coleman, K Connolly, A Curioni, A Dabrowska, I Danko, R Das, GS Davies, S Davis, M Day, G De Rosa, JPAM de André, P de Perio, T Dealtry, A Delbart, C Densham, F Di Lodovico, S Di Luise, P Dinh Tran, J Dobson, U Dore, O Drapier, T Duboyski, F Dufour, J Dumarchez, S Dytman, M Dziewiecki, M Dziomba, S Emery, A Ereditato, JE Escallier, L Escudero, LS Esposito, M Fechner, A Ferrero, AJ Finch, E Frank, Y Fujii, Y Fukuda, V Galymov, GL Ganetis, FC Gannaway, A Gaudin, A Gendotti, MA George, S Giffin, C Giganti, K Gilje, AK Ghosh, T Golan, M Goldhaber, JJ Gomez-Cadenas, S Gomi, M Gonin, N Grant, A Grant, P Gumplinger, P Guzowski, DR Hadley, A Haesler, MD Haigh, K Hamano, C Hansen, D Hansen, T Hara, PF Harrison, B Hartfiel, M Hartz, T Haruyama, T Hasegawa, NC Hastings, A Hatzikoutelis, K Hayashi, Y Hayato, C Hearty, RL Helmer, R Henderson, N Higashi, J Hignight, A Hillairet, T Hiraki, E Hirose, J Holeczek, S Horikawa, K Huang, A Hyndman, AK Ichikawa, K Ieki, M Ieva, M Iida, M Ikeda, J Ilic, J Imber, T Ishida, C Ishihara, T Ishii, SJ Ives, M Iwasaki, K Iyogi, A Izmaylov, B Jamieson, RA Johnson, KK Joo, GV Jover-Manas, CK Jung, H Kaji, T Kajita, H Kakuno, J Kameda, K Kaneyuki, D Karlen, K Kasami, I Kato, H Kawamuko, E Kearns, M Khabibullin, F Khanam, A Khotjantsev, D Kielczewska, T Kikawa, J Kim, JY Kim, SB Kim, N Kimura, B Kirby, J Kisiel, P Kitching, T Kobayashi, G Kogan, S Koike, A Konaka, LL Kormos, A Korzenev, K Koseki, Y Koshio, Y Kouzuma, K Kowalik, V Kravtsov, I Kreslo, W Kropp, H Kubo, J Kubota, Y Kudenko, N Kulkarni, Y Kurimoto, R Kurjata, T Kutter, J Lagoda, K Laihem, A Laing, M Laveder, M Lawe, KP Lee, PT Le, JM Levy, C Licciardi, IT Lim, T Lindner, C Lister, RP Litchfield, M Litos, A Longhin, GD Lopez, PF Loverre, L Ludovici, T Lux, M Macaire, L Magaletti, K Mahn, Y Makida, M Malek, S Manly, A Marchionni, AD Marino, AJ Marone, J Marteau, JF Martin, T Maruyama, T Maryon, J Marzec, P Masliah, EL Mathie, C Matsumura, K Matsuoka, V Matveev, K Mavrokoridis, E Mazzucato, N McCauley, KS McFarland, C McGrew, T McLachlan, M Messina, W Metcalf, C Metelko, M Mezzetto, P Mijakowski, CA Miller, A Minamino, O Mineev, S Mine, AD Missert, G Mituka, M Miura, K Mizouchi, L Monfregola, F Moreau, B Morgan, S Moriyama, A Muir, A Murakami, JF Muratore, M Murdoch, S Murphy, J Myslik, N Nagai, T Nakadaira, M Nakahata, T Nakai, K Nakajima, T Nakamoto, K Nakamura, S Nakayama, T Nakaya, K Nakayoshi, D Naples, ML Navin, TC Nicholls, B Nielsen, C Nielsen, K Nishikawa, H Nishino, K Nitta, T Nobuhara, JA Nowak, Y Obayashi, T Ogitsu, H Ohhata, T Okamura, K Okumura, T Okusawa, SM Oser, M Otani, RA Owen, Y Oyama, T Ozaki, MY Pac, V Palladino, V Paolone, P Paul, D Payne, GF Pearce, JD Perkin, V Pettinacci, F Pierre, E Poplawska, B Popov, M Posiadala, J-M Poutissou, R Poutissou, P Przewlocki, W Qian, JL Raaf, E Radicioni, PN Ratoff, TM Raufer, M Ravonel, M Raymond, F Retiere, A Robert, PA Rodrigues, E Rondio, JM Roney, B Rossi, S Roth, A Rubbia, D Ruterbories, S Sabouri, R Sacco, K Sakashita, F Sánchez, A Sarrat, K Sasaki, K Scholberg, J Schwehr, M Scott, DI Scully, Y Seiya, T Sekiguchi, H Sekiya, M Shibata, Y Shimizu, M Shiozawa, S Short, PD Sinclair, M Siyad, BM Smith, RJ Smith, M Smy, JT Sobczyk, H Sobel, M Sorel, A Stahl, P Stamoulis, J Steinmann, B Still, J Stone, M Stodulski, C Strabel, R Sulej, A Suzuki, K Suzuki, S Suzuki, SY Suzuki, Y Suzuki, Y Suzuki, J Swierblewski, T Szeglowski, M Szeptycka, R Tacik, M Tada, M Taguchi, S Takahashi, A Takeda, Y Takenaga, Y Takeuchi, K Tanaka, HA Tanaka, M Tanaka, MM Tanaka, N Tanimoto, K Tashiro, I Taylor, A Terashima, D Terhorst, R Terri, LF Thompson, A Thorley, W Toki, S Tobayama, T Tomaru, Y Totsuka, C Touramanis, T Tsukamoto, M Tzanov, Y Uchida, K Ueno, A Vacheret, M Vagins, G Vasseur, O Veledar, T Wachala, JJ Walding, AV Waldron, CW Walter, PJ Wanderer, J Wang, MA Ward, GP Ward, D Wark, MO Wascko, A Weber, R Wendell, N West, LH Whitehead, G Wikström, RJ Wilkes, MJ Wilking, Z Williamson, JR Wilson, RJ Wilson, T Wongjirad, S Yamada, Y Yamada, A Yamamoto, K Yamamoto, Y Yamanoi, H Yamaoka, T Yamauchi, C Yanagisawa, T Yano, S Yen, N Yershov, M Yokoyama, T Yuan, A Zalewska, J Zalipska, L Zambelli, K Zaremba, M Ziembicki, ED Zimmerman, M Zito, J Zmuda
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Measurement of the W→τντ cross section in pp collisions at s=7 TeV with the ATLAS experiment

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 706:4-5 (2012) 276-294

Authors:

G Aad, B Abbott, J Abdallah, AA Abdelalim, A Abdesselam, O Abdinov, B Abi, M Abolins, H Abramowicz, H Abreu, E Acerbi, BS Acharya, DL Adams, TN Addy, J Adelman, M Aderholz, 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, M Aliyev, PP Allport, SE Allwood-Spiers, J Almond, A Aloisio, R Alon, A Alonso, MG Alviggi, K Amako, P Amaral, C Amelung, VV Ammosov, A Amorim, G Amorós, N Amram, C Anastopoulos, LS Ancu, N Andari, T Andeen, CF Anders, G Anders, KJ Anderson, A Andreazza, V Andrei, ML Andrieux, XS Anduaga, A Angerami, F Anghinolfi, 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, JP Archambault, S Arfaoui, JF Arguin, E Arik, M Arik, AJ Armbruster, O Arnaez, C Arnault, A Artamonov, G Artoni, D Arutinov

Abstract:

The cross section for the production of W bosons with subsequent decay W→τντ is measured with the ATLAS detector at the LHC. The analysis is based on a data sample that was recorded in 2010 at a proton-proton center-of-mass energy of s=7 TeV and corresponds to an integrated luminosity of 34 pb-1. The cross section is measured in a region of high detector acceptance and then extrapolated to the full phase space. The product of the total W production cross section and the W→τντ branching ratio is measured to be σW→τντtot=11.1±0.3(stat)±1.7(syst)±0.4(lumi) nb. © 2011 CERN.
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Measurement of the cross-section for b-jets produced in association with a Z boson at s=7 TeV with the ATLAS detector

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 706:4-5 (2012) 295-313

Authors:

G Aad, B Abbott, J Abdallah, AA Abdelalim, A Abdesselam, O Abdinov, B Abi, M Abolins, H Abramowicz, H Abreu, E Acerbi, BS Acharya, DL Adams, TN Addy, J Adelman, M Aderholz, 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, M Aliyev, PP Allport, SE Allwood-Spiers, J Almond, A Aloisio, R Alon, A Alonso, MG Alviggi, K Amako, P Amaral, C Amelung, VV Ammosov, A Amorim, G Amorós, N Amram, C Anastopoulos, LS Ancu, N Andari, T Andeen, CF Anders, G Anders, KJ Anderson, A Andreazza, V Andrei, ML Andrieux, XS Anduaga, A Angerami, F Anghinolfi, 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, JP Archambault, S Arfaoui, JF Arguin, E Arik, M Arik, AJ Armbruster, O Arnaez, C Arnault, A Artamonov, G Artoni, D Arutinov

Abstract:

A measurement is presented of the inclusive cross-section for b-jet production in association with a Z boson in pp collisions at a centre-of-mass energy of s=7 TeV. The analysis uses the data sample collected by the ATLAS experiment in 2010, corresponding to an integrated luminosity of approximately 36 pb-1. The event selection requires a Z boson decaying into high pT electrons or muons, and at least one b-jet, identified by its displaced vertex, with transverse momentum pT>25 GeV and rapidity |y|<2.1. After subtraction of background processes, the yield is extracted from the vertex mass distribution of the candidate b-jets. The ratio of this cross-section to the inclusive Z cross-section (the average number of b-jets per Z event) is also measured. Both results are found to be in good agreement with perturbative QCD predictions at next-to-leading order. © 2011 CERN.
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