Measurement of underlying event characteristics using charged particles in pp collisions at √s=900GeV and 7 TeV with the ATLAS detector
Physical Review D - Particles, Fields, Gravitation and Cosmology 83:11 (2011)
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, M Ackers, 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, H Ahmed, M Ahsan, G Aielli, T Akdogan, TPA Ákesson, G Akimoto, AV Akimov, MS Alam, MA Alam, S Albrand, M Aleksa, IN Aleksandrov, M Aleppo, 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, J Alonso, MG Alviggi, K Amako, P Amaral, C Amelung, VV Ammosov, A Amorim, G Amorós, N Amram, C Anastopoulos, T Andeen, CF Anders, KJ Anderson, A Andreazza, V Andrei, ML Andrieux, XS Anduaga, A Angerami, F Anghinolfi, N Anjos, A Annovi, A Antonaki, M Antonelli, S Antonelli, J Antos, B Antunovic, F Anulli, S Aoun, R Apolle, G Arabidze, I Aracena, Y Arai, ATH Arce, JP Archambault, S Arfaoui, JF Arguin, T Argyropoulos, E Arik, M Arik, AJ Armbruster, KE Arms, SR Armstrong, O Arnaez, C Arnault, A ArtamonovAbstract:
Measurements of charged particle distributions, sensitive to the underlying event, have been performed with the ATLAS detector at the LHC. The measurements are based on data collected using a minimum-bias trigger to select proton-proton collisions at center-of-mass energies of 900 GeV and 7 TeV. The "underlying event" is defined as those aspects of a hadronic interaction attributed not to the hard scattering process, but rather to the accompanying interactions of the rest of the proton. Three regions are defined in azimuthal angle with respect to the highest transverse momentum charged particle in the event, such that the region transverse to the dominant momentum-flow is most sensitive to the underlying event. In each of these regions, distributions of the charged particle multiplicity, transverse momentum density, and average pT are measured. The data show generally higher underlying event activity than that predicted by Monte Carlo models tuned to pre-LHC data. © 2011 American Physical Society.Measurement of dijet azimuthal decorrelations in pp collisions at sqrt(s)=7 TeV.
Phys Rev Lett 106:17 (2011) 172002
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, MS Alam, MA Alam, S Albrand, M Aleksa, IN Aleksandrov, M Aleppo, 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, T Andeen, CF Anders, KJ Anderson, A Andreazza, V Andrei, M-L Andrieux, XS Anduaga, A Angerami, F Anghinolfi, N Anjos, A Annovi, A Antonaki, M Antonelli, S 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, J-F Arguin, E Arik, M Arik, AJ Armbruster, O Arnaez, C Arnault, A Artamonov, G Artoni, D Arutinov, S Asai, R Asfandiyarov, S Ask, B Åsman, L Asquith, K Assamagan, A Astbury, A Astvatsatourov, G Atoian, B Aubert, B Auerbach, E Auge, K Augsten, M Aurousseau, N Austin, R Avramidou, D Axen, C Ay, G Azuelos, Y Azuma, MA Baak, G Baccaglioni, C Bacci, AM Bach, H Bachacou, K Bachas, G Bachy, M Backes, M Backhaus, E Badescu, P Bagnaia, S Bahinipati, Y Bai, DC Bailey, T Bain, JT Baines, OK Baker, MD Baker, S Baker, F Baltasar Dos Santos Pedrosa, E Banas, P Banerjee, Sw Banerjee, D Banfi, A Bangert, V Bansal, HS Bansil, L Barak, SP Baranov, A Barashkou, 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, AJ Barr, F Barreiro, J Barreiro Guimarães da Costa, P Barrillon, R Bartoldus, AE Barton, D Bartsch, V Bartsch, RL Bates, L Batkova, JR Batley, A Battaglia, M Battistin, G Battistoni, F Bauer, HS Bawa, B Beare, T Beau, PH Beauchemin, R Beccherle, P Bechtle, HP Beck, M Beckingham, KH Becks, AJ Beddall, A Beddall, VA Bednyakov, CP Bee, M Begel, S Behar Harpaz, PK Behera, M Beimforde, C Belanger-Champagne, PJ Bell, WH Bell, G Bella, L Bellagamba, F Bellina, G Bellomo, M Bellomo, A Belloni, O Beloborodova, K Belotskiy, O Beltramello, S Ben Ami, O Benary, D Benchekroun, C Benchouk, M Bendel, BH Benedict, N Benekos, Y Benhammou, DP Benjamin, M Benoit, JR Bensinger, K Benslama, S Bentvelsen, D Berge, E Bergeaas Kuutmann, N Berger, F Berghaus, E Berglund, J Beringer, K Bernardet, P Bernat, R Bernhard, C Bernius, T Berry, A Bertin, F Bertinelli, F Bertolucci, MI Besana, N Besson, S Bethke, W Bhimji, RM Bianchi, M Bianco, O Biebel, SP Bieniek, J Biesiada, M Biglietti, H Bilokon, M Bindi, S Binet, A Bingul, C Bini, C Biscarat, U Bitenc, KM Black, RE Blair, J-B Blanchard, G Blanchot, C Blocker, J Blocki, A Blondel, W Blum, U Blumenschein, GJ Bobbink, VB Bobrovnikov, A Bocci, CR Boddy, M 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Leeuw, E van der Poel, D van der Ster, B Van Eijk, N van Eldik, P van Gemmeren, Z van Kesteren, I van Vulpen, W Vandelli, G Vandoni, A Vaniachine, P Vankov, F Vannucci, F Varela Rodriguez, R Vari, EW Varnes, D Varouchas, A Vartapetian, KE Varvell, VI Vassilakopoulos, F Vazeille, G Vegni, JJ Veillet, C Vellidis, 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, GHA Viehhauser, S Viel, M Villa, M Villaplana Perez, E Vilucchi, MG Vincter, E Vinek, VB Vinogradov, M Virchaux, S Viret, J Virzi, A Vitale, O Vitells, M Viti, I Vivarelli, F Vives Vaque, S Vlachos, M Vlasak, N Vlasov, A Vogel, P Vokac, M Volpi, G Volpini, H von der Schmitt, J von Loeben, H von Radziewski, E von Toerne, V Vorobel, AP Vorobiev, V Vorwerk, M Vos, R Voss, TT Voss, JH Vossebeld, AS Vovenko, N Vranjes, M Vranjes Milosavljevic, V Vrba, M Vreeswijk, T Vu Anh, R Vuillermet, I Vukotic, W Wagner, P Wagner, H Wahlen, J Wakabayashi, J Walbersloh, S Walch, J Walder, R Walker, W Walkowiak, R Wall, P Waller, C Wang, H Wang, J Wang, J Wang, JC Wang, R Wang, SM Wang, A Warburton, CP Ward, M Warsinsky, PM Watkins, AT Watson, MF Watson, G Watts, S Watts, AT Waugh, BM Waugh, J Weber, M Weber, MS Weber, P Weber, AR Weidberg, P Weigell, J Weingarten, C Weiser, H Wellenstein, PS Wells, M Wen, T Wenaus, S Wendler, Z Weng, T Wengler, S Wenig, N Wermes, M Werner, P Werner, M Werth, M Wessels, K Whalen, SJ Wheeler-Ellis, SP Whitaker, 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, 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, MW Wolter, H Wolters, G Wooden, BK Wosiek, J Wotschack, MJ Woudstra, K Wraight, C Wright, B Wrona, SL Wu, X Wu, Y Wu, E Wulf, R Wunstorf, BM Wynne, L Xaplanteris, S Xella, S Xie, Y Xie, C Xu, D Xu, G Xu, B Yabsley, M Yamada, A Yamamoto, K Yamamoto, S Yamamoto, T Yamamura, J Yamaoka, T Yamazaki, Y Yamazaki, Z Yan, H Yang, UK Yang, Y Yang, Y Yang, Z Yang, S Yanush, W-M Yao, Y Yao, Y Yasu, GV Ybeles Smit, J Ye, S Ye, M Yilmaz, R Yoosoofmiya, K Yorita, R Yoshida, C Young, S Youssef, D Yu, J Yu, J Yu, L Yuan, A Yurkewicz, VG Zaets, R Zaidan, AM Zaitsev, Z Zajacova, Yo K Zalite, L Zanello, P Zarzhitsky, A Zaytsev, C Zeitnitz, M Zeller, PF Zema, A Zemla, C Zendler, AV Zenin, O Zenin, T Zeniš, Z Zenonos, 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, S Zheng, J Zhong, B Zhou, N Zhou, Y Zhou, CG Zhu, H Zhu, Y Zhu, X Zhuang, V Zhuravlov, D Zieminska, B Zilka, R Zimmermann, S Zimmermann, S Zimmermann, M Ziolkowski, R Zitoun, L Zivković, VV Zmouchko, G Zobernig, A Zoccoli, Y Zolnierowski, A Zsenei, M zur Nedden, V Zutshi, L Zwalinski, ATLAS CollaborationAbstract:
Azimuthal decorrelations between the two central jets with the largest transverse momenta are sensitive to the dynamics of events with multiple jets. We present a measurement of the normalized differential cross section based on the full data set (∫Ldt=36 pb(-1)) acquired by the ATLAS detector during the 2010 sqrt(s)=7 TeV proton-proton run of the LHC. The measured distributions include jets with transverse momenta up to 1.3 TeV, probing perturbative QCD in a high-energy regime.Search for massive long-lived highly ionising particles with the ATLAS detector at the LHC
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 698:5 (2011) 353-370
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, MS Alam, MA Alam, S Albrand, M Aleksa, IN Aleksandrov, M Aleppo, 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, T Andeen, CF Anders, KJ Anderson, A Andreazza, V Andrei, ML Andrieux, XS Anduaga, A Angerami, F Anghinolfi, N Anjos, A Annovi, A Antonaki, M Antonelli, S Antonelli, 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, SR Armstrong, O Arnaez, C Arnault, A Artamonov, G Artoni, D Arutinov, S Asai, R Asfandiyarov, S AskAbstract:
A search is made for massive highly ionising particles with lifetimes in excess of 100 ns, with the ATLAS experiment at the Large Hadron Collider, using 3.1 pb-1 of pp collision data taken at √s=7 TeV. The signature of energy loss in the ATLAS inner detector and electromagnetic calorimeter is used. No such particles are found and limits on the production cross section for electric charges 6e≤|q|≤17e and masses 200 GeV≤m≤1000 GeV are set in the range 1-12 pb for different hypotheses on the production mechanism. © 2011 CERN.Progress with the single-sided module prototypes for the ATLAS tracker upgrade stave
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 636:1 SUPPL. (2011)
Authors:
PP Allport, AA Affolder, F Anghinolfi, R Bates, C Betancourt, C Buttar, JR Carter, G Casse, H Chen, A Chilingarov, JV Civera, A Clark, AP Colijn, W Dabrowski, N Dawson, B Dewilde, S Dhawan, N Dressnandt, M Dwužnik, L Eklund, V Fadeyev, P Farthouat, D Ferrère, H Fox, R French, B Gallop, C García, M Gerling, M Gibson, M Gilchriese, S Gonzalez Sevilla, M Goodrick, A Greenall, AA Grillo, CH Haber, NP Hessey, R Holt, LBA Hommels, K Jakobs, TJ Jones, J Kaplon, J Kierstead, E Koffeman, M Köhler, C Lacasta, D La Marra, Z Li, S Lindgren, D Lynn, P Maddock, K Mahboubi, F Martinez-Mckinney, J Matheson, R Maunu, R McCarthy, M Newcomer, R Nickerson, V O'Shea, S Paganis, U Parzefall, S Pernecker, P Phillips, K Poltorak, D Puldon, D Robinson, HFW Sadrozinski, D Santoyo, S Sattari, D Schamberger, A Seiden, P Sutcliffe, K Swientek, D Tsionou, M Tyndel, Y Unno, G Viehhauser, EG Villani, J Von Wilpert, R Wastie, M Weber, A Weidberg, L Wiik, I Wilmut, M Wormald, J Wright, D XuAbstract:
The ATLAS experiment is preparing for the planned luminosity upgrade of the LHC (the super-luminous LHC or sLHC) with a programme of development for tracking able to withstand an order of greater magnitude radiation fluence and much greater hit occupancy rates than the current detector. This has led to the concept of an all-silicon tracker with an enhanced performance pixel-based inner region and short-strips for much of the higher radii. Both sub-systems employ many common technologies, including the proposed stave concept for integrated cooling and support. For the short-strip region, use of this integrated stave concept requires single-sided modules mounted on either side of a thin central lightweight support. Each sensor is divided into four rows of 23.82 mm length strips; within each row, there are 1280 strips of 74.5μm pitch. Well over a hundred prototype sensors are being delivered by Hamamatsu Photonics (HPK) to Japan, Europe and the US. We present results of the first 20 chip ABCN25 ASIC hybrids for these sensors, results of the first prototype 5120 strip module built with 40 ABCN25 read-out ASICs, and the status of the hybrids and modules being developed for the ATLAS tracker upgrade stave programme. © 2010 Elsevier B.V.Search for supersymmetry using final states with one lepton, jets, and missing transverse momentum with the ATLAS detector in √s=7 TeV pp collisions.
Phys Rev Lett 106:13 (2011) 131802