Accelerator Neutrinos

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Search for the Standard Model Higgs boson produced in association with a vector boson and decaying to a b-quark pair with the ATLAS detector

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 718:2 (2012) 369-390

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 Agustoni, M Aharrouche, SP Ahlen, F Ahles, A Ahmad, M Ahsan, G Aielli, T Akdogan, TPA A kesson, 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, 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, P Anger, 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

Abstract:

This Letter presents the results of a direct search with the ATLAS detector at the LHC for a Standard Model Higgs boson of mass 110≤m H ≤130GeV produced in association with a W or Z boson and decaying to bb'. Three decay channels are considered: ZH→ℓ+ℓ-bb', WH→ℓνbb' and ZH→νν'bb', where ℓ corresponds to an electron or a muon. No evidence for Higgs boson production is observed in a dataset of 7TeV pp collisions corresponding to 4.7fb -1 of integrated luminosity collected by ATLAS in 2011. Exclusion limits on Higgs boson production, at the 95% confidence level, of 2.5 to 5.5 times the Standard Model cross section are obtained in the mass range 110-130GeV. The expected exclusion limits range between 2.5 and 4.9 for the same mass interval. © 2012 CERN.
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Search for doubly charged Higgs bosons in like-sign dilepton final states at √s = 7 TeV with the ATLAS detector

European Physical Journal C 72:12 (2012)

Authors:

G Aad, T Abajyan, B Abbott, J Abdallah, SA Khalek, AA Abdelalim, O Abdinov, R Aben, B Abi, M Abolins, OSA Zeid, 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, 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, BA Gonzalez, MG Alviggi, K Amako, C Amelung, VV Ammosov, SPA 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, LA Bella, R Apolle, G Arabidze, I Aracena, Y Arai, ATH Arce, S Arfaoui, JF Arguin, S Argyropoulos, E Arik

Abstract:

A search for doubly charged Higgs bosons decaying to pairs of electrons and/or muons is presented. The search is performed using a data sample corresponding to an integrated luminosity of 4.7 fb−1of pp collisions at √s = 7 TeV collected by the ATLAS detector at the LHC. Pairs of prompt, isolated, high-pT leptons with the same electric charge (e±e±, e±μ±, μ±μ±) are selected, and their invariant mass distribution is searched for a narrow resonance. No significant excess over Standard Model background expectations is observed, and limits are placed on the cross section times branching ratio for pair production of doubly charged Higgs bosons. The masses of doubly charged Higgs bosons are constrained depending on the branching ratio into these leptonic final states. Assuming pair production, coupling to left-handed fermions, and a branching ratio of 100% for each final state, masses below 409 GeV, 375 GeV, and 398 GeV are excluded for e±e±, e±μ±, and μ±μ±, respectively.
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Measurements of the T2K neutrino beam properties using the INGRID on-axis near detector

Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 694 (2012) 211-223

Authors:

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, D Calvet, 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, 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, M George, S Giffin, C Giganti, K Gilje, AK Ghosh

Abstract:

Precise measurement of neutrino beam direction and intensity was achieved based on a new concept with modularized neutrino detectors. INGRID (Interactive Neutrino GRID) is an on-axis near detector for the T2K long baseline neutrino oscillation experiment. INGRID consists of 16 identical modules arranged in horizontal and vertical arrays around the beam center. The module has a sandwich structure of iron target plates and scintillator trackers. INGRID directly monitors the muon neutrino beam profile center and intensity using the number of observed neutrino events in each module. The neutrino beam direction is measured with accuracy better than 0.4 mrad from the measured profile center. The normalized event rate is measured with 4% precision. © 2012 Elsevier B.V. All rights reserved.
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Synchronization between remote sites for the MINOS experiment

44th Annual Precise Time and Time Interval (PTTI) Systems and Applications Meeting 2012 (2012) 99-117

Authors:

S Römisch, SR Jefferts, V Zhang, TE Parker, N Ashby, P Adamson, G Barr, A Habig, J Meier, C James, R Nicol, R Plunkett, C Rosenfeld, R Bumgarner, M Christensen, J Hirschauer, B Fonville, S Mitchell, A McKinley, E Powers, J Wright, D Matsakis

Abstract:

In the context of time-of-flight measurements, the timing at the departure and arrival locations is obviously critical to the outcome of the experiment. In the case of neutrino time-of-flight experiments, the locations are many hundreds of kilometers apart with synchronization requirements of nanoseconds for several months at a time. In addition to the already stringent set of requirements outlined above, the locations of the origin of the particle beam and the detector need to be precisely determined. NIST and USNO have provided the MINOS (Main Injector Neutrino Oscillation Search) collaboration with both hardware and expertise to synchronize the two sites of the experiment, the accelerator at Fermilab in Batavia, IL and the Soudan Mine in northern Minnesota. Two GPS receivers are installed at each location where the local clocks are commercial Cesium clocks. Two more GPS receivers are constantly traveling between locations (including NIST in Boulder, CO) to provide multiple differential calibrations of the fixed receivers. The availability of the TWTFST equipment from USNO allowed for one comparison between the GPS and TWSTFT for the link between the locations, providing an independent means of determining the accuracy of the synchronization. Several months of continuous GPS data are now available, including the two-way calibration instance and several differential GPS calibrations. The results of data processing yielded synchronization stability below one nanosecond with accuracy at the nanosecond level over several months. © (2012) by the Institute of Navigation. All rights reserved.

Measurements of the T2K neutrino beam properties using the INGRID on-axis near detector

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment Elsevier 694 (2012) 211-223

Authors:

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, D Calvet, 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, 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, M 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, 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, E Hirose, J Holeczek, S Horikawa, 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, M Laveder, KP Lee, PT Le, JM Levy, C Licciardi, IT Lim, T Lindner, RP Litchfield, M Litos, A Longhin, GD Lopez, PF Loverre, L Ludovici, T Lux, M Macaire, 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, D Naples, ML Navin, B Nelson, TC Nicholls, 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, M Siyad, 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, 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, The T2K Collaboration
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