Search for direct top squark pair production in final states with one isolated lepton, jets, and missing transverse momentum in sqrt[s] = 7 TeV pp collisions using 4.7 fb(-10 of ATLAS data.
Phys Rev Lett 109:21 (2012) 211803
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 Akesson, 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, AD Altheimer, 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, M Aoki, S Aoun, L Aperio Bella, R Apolle, G Arabidze, I Aracena, Y Arai, ATH Arce, S Arfaoui, J-F Arguin, E Arik, M Arik, AJ Armbruster, O Arnaez, V Arnal, C Arnault, A Artamonov, G Artoni, D Arutinov, S Asai, R Asfandiyarov, S Ask, B Asman, L Asquith, K Assamagan, A Astbury, M Atkinson, B Aubert, E Auge, K Augsten, M Aurousseau, G Avolio, R Avramidou, D Axen, G Azuelos, Y Azuma, MA Baak, G Baccaglioni, C Bacci, AM Bach, H Bachacou, K Bachas, M Backes, M Backhaus, E Badescu, P Bagnaia, S Bahinipati, Y Bai, DC Bailey, T Bain, JT Baines, OK Baker, MD Baker, S Baker, E Banas, P Banerjee, Sw Banerjee, D Banfi, A Bangert, V Bansal, HS Bansil, L Barak, SP Baranov, A Barbaro Galtieri, T Barber, EL Barberio, D Barberis, M Barbero, DY Bardin, T Barillari, M Barisonzi, T Barklow, N Barlow, BM Barnett, RM Barnett, A Baroncelli, G Barone, AJ Barr, F Barreiro, J Barreiro Guimarães da Costa, P Barrillon, R Bartoldus, AE Barton, V Bartsch, A Basye, RL Bates, L Batkova, JR Batley, A Battaglia, M Battistin, F Bauer, HS Bawa, S Beale, T Beau, PH Beauchemin, R Beccherle, P Bechtle, HP Beck, AK Becker, S Becker, M Beckingham, KH Becks, AJ Beddall, A Beddall, S Bedikian, VA Bednyakov, CP Bee, LJ Beemster, M Begel, S Behar Harpaz, M Beimforde, C Belanger-Champagne, PJ Bell, WH Bell, G Bella, L Bellagamba, F Bellina, M Bellomo, A Belloni, O Beloborodova, K Belotskiy, O Beltramello, O Benary, D Benchekroun, K Bendtz, N Benekos, Y Benhammou, E Benhar Noccioli, JA Benitez Garcia, DP Benjamin, M Benoit, JR Bensinger, K Benslama, S Bentvelsen, D Berge, E Bergeaas Kuutmann, N Berger, F Berghaus, E Berglund, J Beringer, P Bernat, R Bernhard, C Bernius, T Berry, C Bertella, A Bertin, F Bertolucci, MI Besana, GJ Besjes, N Besson, S Bethke, W Bhimji, RM Bianchi, M Bianco, O Biebel, SP Bieniek, K Bierwagen, J Biesiada, M Biglietti, H Bilokon, M Bindi, S Binet, A Bingul, C Bini, C Biscarat, B Bittner, KM Black, RE Blair, J-B Blanchard, G Blanchot, T Blazek, I Bloch, C Blocker, J Blocki, A Blondel, W Blum, U 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Terron, M Testa, RJ Teuscher, J Therhaag, T Theveneaux-Pelzer, S Thoma, JP Thomas, EN Thompson, PD Thompson, PD Thompson, AS Thompson, LA Thomsen, E Thomson, M Thomson, WM Thong, RP Thun, F Tian, MJ Tibbetts, T Tic, VO Tikhomirov, YA Tikhonov, S Timoshenko, P Tipton, S Tisserant, T Todorov, S Todorova-Nova, B Toggerson, J Tojo, S Tokár, K Tokushuku, K Tollefson, M Tomoto, L Tompkins, K Toms, A Tonoyan, C Topfel, ND Topilin, I Torchiani, E Torrence, H Torres, E Torró Pastor, J Toth, F Touchard, DR Tovey, T Trefzger, L Tremblet, A Tricoli, IM Trigger, S Trincaz-Duvoid, MF Tripiana, N Triplett, W Trischuk, B Trocmé, C Troncon, M Trottier-McDonald, M Trzebinski, A Trzupek, C Tsarouchas, JC-L Tseng, M Tsiakiris, PV Tsiareshka, D Tsionou, G Tsipolitis, S Tsiskaridze, V Tsiskaridze, EG Tskhadadze, II Tsukerman, V Tsulaia, J-W Tsung, S Tsuno, D Tsybychev, A Tua, A Tudorache, V Tudorache, JM Tuggle, M Turala, D Turecek, I Turk Cakir, E Turlay, R Turra, PM Tuts, A Tykhonov, M Tylmad, M Tyndel, G Tzanakos, K Uchida, I Ueda, R Ueno, M Ugland, M Uhlenbrock, M Uhrmacher, F Ukegawa, G Unal, A Undrus, G Unel, Y Unno, D Urbaniec, P Urquijo, G Usai, M Uslenghi, L Vacavant, V Vacek, B Vachon, S Vahsen, J Valenta, S Valentinetti, A Valero, S Valkar, E Valladolid Gallego, S Vallecorsa, JA Valls Ferrer, PC Van Der Deijl, R van der Geer, H van der Graaf, R Van Der Leeuw, E van der Poel, D van der Ster, N van Eldik, P van Gemmeren, I van Vulpen, M Vanadia, W Vandelli, A Vaniachine, P Vankov, F Vannucci, R Vari, T Varol, D Varouchas, A Vartapetian, KE Varvell, VI Vassilakopoulos, F Vazeille, T Vazquez Schroeder, G Vegni, JJ Veillet, F Veloso, R Veness, S Veneziano, A Ventura, D Ventura, M Venturi, N Venturi, V Vercesi, M Verducci, W Verkerke, JC Vermeulen, A Vest, MC Vetterli, I Vichou, T Vickey, OE Vickey Boeriu, GHA Viehhauser, S Viel, M Villa, M Villaplana Perez, E Vilucchi, MG Vincter, E Vinek, VB Vinogradov, M Virchaux, J Virzi, O Vitells, M Viti, I Vivarelli, F Vives Vaque, S Vlachos, D Vladoiu, M Vlasak, A Vogel, P Vokac, G Volpi, M Volpi, G Volpini, H von der Schmitt, H von Radziewski, E von Toerne, V Vorobel, V Vorwerk, M Vos, R Voss, TT Voss, JH Vossebeld, N Vranjes, M Vranjes Milosavljevic, V Vrba, M Vreeswijk, T Vu Anh, R Vuillermet, I Vukotic, W Wagner, P Wagner, H Wahlen, S Wahrmund, J Wakabayashi, S Walch, J Walder, R Walker, W Walkowiak, R Wall, P Waller, B Walsh, C Wang, H Wang, H Wang, J Wang, J Wang, R Wang, SM Wang, T Wang, A Warburton, CP Ward, M Warsinsky, A Washbrook, C Wasicki, I Watanabe, PM Watkins, AT Watson, IJ Watson, MF Watson, G Watts, S Watts, AT Waugh, BM Waugh, MS Weber, P Weber, AR Weidberg, P Weigell, J Weingarten, C Weiser, PS Wells, T Wenaus, D Wendland, Z Weng, T Wengler, S Wenig, N Wermes, M Werner, P Werner, M Werth, M Wessels, J Wetter, C Weydert, K Whalen, SJ Wheeler-Ellis, A White, MJ White, S White, SR Whitehead, D Whiteson, D Whittington, F Wicek, D Wicke, FJ Wickens, W Wiedenmann, M Wielers, P Wienemann, C Wiglesworth, LAM Wiik-Fuchs, PA Wijeratne, A Wildauer, MA Wildt, I Wilhelm, HG Wilkens, JZ Will, E Williams, HH Williams, W Willis, S Willocq, JA Wilson, MG Wilson, A Wilson, I Wingerter-Seez, S Winkelmann, F Winklmeier, M Wittgen, SJ Wollstadt, MW Wolter, H Wolters, WC Wong, G Wooden, BK Wosiek, J Wotschack, MJ Woudstra, KW Wozniak, K Wraight, M Wright, B Wrona, SL Wu, X Wu, Y Wu, E Wulf, BM Wynne, S Xella, M Xiao, S Xie, C Xu, D Xu, B Yabsley, S Yacoob, M Yamada, H Yamaguchi, A Yamamoto, K Yamamoto, S Yamamoto, T Yamamura, T Yamanaka, J Yamaoka, T Yamazaki, Y Yamazaki, Z Yan, H Yang, UK Yang, Y Yang, Z Yang, S Yanush, L Yao, Y Yao, Y Yasu, GV Ybeles Smit, J Ye, S Ye, M Yilmaz, R Yoosoofmiya, K Yorita, R Yoshida, C Young, CJ Young, S Youssef, D Yu, J Yu, J Yu, L Yuan, A Yurkewicz, M Byszewski, B Zabinski, R Zaidan, AM Zaitsev, Z Zajacova, L Zanello, D Zanzi, A Zaytsev, C Zeitnitz, M Zeman, A Zemla, C Zendler, O Zenin, T Zeniš, Z Zinonos, S Zenz, D Zerwas, G Zevi Della Porta, Z Zhan, D Zhang, H Zhang, J Zhang, X Zhang, Z Zhang, L Zhao, T Zhao, Z Zhao, A Zhemchugov, J Zhong, B Zhou, N Zhou, Y Zhou, CG Zhu, H Zhu, J Zhu, Y Zhu, X Zhuang, V Zhuravlov, D Zieminska, NI Zimin, R Zimmermann, S Zimmermann, S Zimmermann, M Ziolkowski, R Zitoun, L Zivković, VV Zmouchko, G Zobernig, A Zoccoli, M Zur Nedden, V Zutshi, L Zwalinski, ATLAS CollaborationAbstract:
A search is presented for direct top squark pair production in final states with one isolated electron or muon, jets, and missing transverse momentum in proton-proton collisions at sqrt[s] = 7 TeV. The measurement is based on 4.7 fb(-1) of data collected with the ATLAS detector at the LHC. Each top squark is assumed to decay to a top quark and the lightest supersymmetric particle (LSP). The data are found to be consistent with standard model expectations. Top squark masses between 230 GeV and 440 GeV are excluded with 95% confidence for massless LSPs, and top squark masses around 400 GeV are excluded for LSP masses up to 125 GeV.A Large Hadron Electron Collider at CERN
(2012)
Authors:
JL Abelleira Fernandez, C Adolphsen, P Adzic, AN Akay, H Aksakal, JL Albacete, B Allanach, S Alekhin, P Allport, V Andreev, RB Appleby, E Arikan, N Armesto, G Azuelos, M Bai, D Barber, J Bartels, O Behnke, J Behr, AS Belyaev, I Ben-Zvi, N Bernard, S Bertolucci, S Bettoni, S Biswal, J Blümlein, H Böttcher, A Bogacz, C Bracco, J Bracinik, G Brandt, H Braun, S Brodsky, O Brüning, E Bulyak, A Buniatyan, H Burkhardt, IT Cakir, O Cakir, R Calaga, A Caldwell, V Cetinkaya, V Chekelian, E Ciapala, R Ciftci, AK Ciftci, BA Cole, JC Collins, O Dadoun, J Dainton, A De Roeck, D d'Enterria, P DiNezza, M D'Onofrio, A Dudarev, A Eide, R Enberg, E Eroglu, KJ Eskola, L Favart, M Fitterer, S Forte, A Gaddi, P Gambino, H García Morales, T Gehrmann, P Gladkikh, C Glasman, A Glazov, R Godbole, B Goddard, T Greenshaw, A Guffanti, V Guzey, C Gwenlan, T Han, Y Hao, F Haug, W Herr, A Hervé, BJ Holzer, M Ishitsuka, M Jacquet, B Jeanneret, E Jensen, JM Jimenez, JM Jowett, H Jung, H Karadeniz, D Kayran, A Kilic, K Kimura, R Klees, M Klein, U Klein, T Kluge, F Kocak, M Korostelev, A Kosmicki, P Kostka, H Kowalski, M Kraemer, G Kramer, D Kuchler, M Kuze, T Lappi, P Laycock, E Levichev, S Levonian, VN Litvinenko, A Lombardi, J Maeda, C Marquet, B Mellado, KH Mess, A Milanese, JG Milhano, S Moch, II Morozov, Y Muttoni, S Myers, S Nandi, Z Nergiz, PR Newman, T Omori, J Osborne, E Paoloni, Y Papaphilippou, C Pascaud, H Paukkunen, E Perez, T Pieloni, E Pilicer, B Pire, R Placakyte, A Polini, V Ptitsyn, Y Pupkov, V Radescu, S Raychaudhuri, L Rinolfi, E Rizvi, R Rohini, J Rojo, S Russenschuck, M Sahin, CA Salgado, K Sampei, R Sassot, E Sauvan, M Schaefer, U Schneekloth, T Schörner-Sadenius, D Schulte, A Senol, A Seryi, P Sievers, AN Skrinsky, W Smith, D South, H Spiesberger, AM Stasto, M Strikman, M Sullivan, S Sultansoy, YP Sun, B Surrow, L Szymanowski, P Taels, I Tapan, T Tasci, E Tassi, H Ten Kate, J Terron, H Thiesen, L Thompson, P Thompson, K Tokushuku, R Tomás García, D Tommasini, D Trbojevic, N Tsoupas, J Tuckmantel, S Turkoz, TN Trinh, K Tywoniuk, G Unel, T Ullrich, J Urakawa, P VanMechelen, A Variola, R Veness, A Vivoli, P Vobly, J Wagner, R Wallny, S Wallon, G Watt, C Weiss, UA Wiedemann, U Wienands, F Willeke, B-W Xiao, V Yakimenko, AF Zarnecki, Z Zhang, F Zimmermann, R Zlebcik, F ZomerMeasurement of event shapes at large momentum transfer with the ATLAS detector in pp collisions at √s =7 TeV
European Physical Journal C 72:11 (2012)
Authors:
G Aad, B Abbott, J Abdallah, SA Khalek, AA Abdelalim, O Abdinov, B Abi, M Abolins, OSA Zeid, 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 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, BA 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, LA Bella, R Apolle, G Arabidze, I Aracena, Y Arai, ATH Arce, S Arfaoui, JF Arguin, E Arik, M Arik, AJ Armbruster, O Arnaez, V Arnal, C Arnault, A Artamonov, G ArtoniAbstract:
A measurement of event shape variables is presented for large momentum transfer proton-proton collisions using the ATLAS detector at the Large Hadron Collider. Six event shape variables calculated using hadronic jets are studied in inclusive multi-jet events in 35 pb-1 of integrated luminosity at a center-of-mass energy of √s = 7 TeV. These measurements are compared to predictions by three Monte Carlo event generators containing leading-logarithmic parton showers matched to leading order matrix elements for 2→2 and 2→n (n = 2, …, 6) scattering. Measurements of the third-jet resolution parameter, aplanarity, thrust, sphericity, and transverse sphericity are generally well described. The mean value of each event shape variable is evaluated as a function of the average momentum of the two leading jets pSearch for supersymmetry in events with large missing transverse momentum, jets, and at least one tau lepton in 7 TeV proton-proton collision data with the ATLAS detector
European Physical Journal C 72:11 (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, JAA 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, SEA 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, E ArikAbstract:
A search for supersymmetry (SUSY) in events with large missing transverse momentum, jets, and at least one hadronically decaying τ lepton, with zero or one additional light lepton (e/μ), has been performed using 4.7 fb−1of proton-proton collision data at √s = 7 TeV recorded with the ATLAS detector at the Large Hadron Collider. No excess above the Standard Model background expectation is observed and a 95 % confidence level visible cross-section upper limit for new phenomena is set. In the framework of gauge-mediated SUSY-breaking models, lower limits on the mass scale Λ are set at 54 TeV in the regions where the τ1is the next-to-lightest SUSY particle (tanβ > 20). These limits provide the most stringent tests to date of GMSB models in a large part of the parameter space considered.Inclusive-jet photoproduction at HERA and determination of α s
Nuclear Physics B 864:1 (2012) 1-37