ATLAS

Research group

Research theme

Sub department

About

Related research groups

Shape, transverse size, and charged-hadron multiplicity of jets in pp collisions at √s = 7 TeV

Journal of High Energy Physics 2012:6 (2012)

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, J Hammer, M Hoch, N Hörmann, J Hrubec, M Jeitler, W Kiesenhofer, M Krammer, D Liko, I Mikulec, M Pernicka, B Rahbaran, C Rohringer, H Rohringer, R Schöfbeck, J Strauss, A Taurok, F Teischinger, P Wagner, W Waltenberger, G Walzel, E Widl, CE Wulz, V Mossolov, N Shumeiko, J Suarez Gonzalez, S Bansal, L Benucci, EA De Wolf, X Janssen, S Luyckx, T Maes, L Mucibello, S Ochesanu, B Roland, R Rougny, M Selvaggi, H Van Haevermaet, P Van Mechelen, N Van Remortel, A Van Spilbeeck, F Blekman, S Blyweert, J D'Hondt, R Gonzalez Suarez, A Kalogeropoulos, M Maes, A Olbrechts, W Van Doninck, P Van Mulders, GP Van Onsem, I Villella, O Charaf, B Clerbaux, G De Lentdecker, V Dero, APR Gay, GH Hammad, T Hreus, A Léonard, PE Marage, L Thomas, C Vander Velde, P Vanlaer, J Wickens, V Adler, K Beernaert, A Cimmino, S Costantini, M Grunewald, B Klein, J Lellouch, A Marinov, J McCartin, D Ryckbosch, N Strobbe, F Thyssen, M Tytgat, L Vanelderen, P Verwilligen, S Walsh, N Zaganidis, S Basegmez, G Bruno, J Caudron, L Ceard, J De Favereau De Jeneret, C Delaere, D Favart

Abstract:

Measurements of jet characteristics from inclusive jet production in proton-proton collisions at a centre-of-mass energy of 7TeV are presented. The data sample was collected with the CMS detector at the LHC during 2010 and corresponds to an integrated luminosity of 36 pb-1. The mean charged-hadron multiplicity, the differential and integral jet shape distributions, and two independent moments of the shape distributions are measured as functions of the jet transverse momentum for jets reconstructed with the anti-κT algorithm. The measured observables are corrected to the particle level and compared with predictions from various QCD Monte Carlo generators. © Copyright CERN.
More details from the publisher
More details

Suppression of non-prompt J/ψ, prompt J/ψ, and Y(1S) in PbPb collisions at √sNN = 2.76 TeV

Journal of High Energy Physics 2012:5 (2012)

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, J Hammer, M Hoch, N Hörmann, J Hrubec, M Jeitler, W Kiesenhofer, M Krammer, D Liko, I Mikulec, M Pernicka, B Rahbaran, C Rohringer, H Rohringer, R Schöfbeck, J Strauss, A Taurok, F Teischinger, P Wagner, W Waltenberger, G Walzel, E Widl, CE Wulz, V Mossolov, N Shumeiko, J Suarez Gonzalez, S Bansal, L Benucci, EA De Wolf, X Janssen, S Luyckx, T Maes, L Mucibello, S Ochesanu, B Roland, R Rougny, M Selvaggi, H Van Haevermaet, P Van Mechelen, N Van Remortel, A Van Spilbeeck, F Blekman, S Blyweert, J D'Hondt, R Gonzalez Suarez, A Kalogeropoulos, M Maes, A Olbrechts, W Van Doninck, P Van Mulders, GP Van Onsem, I Villella, O Charaf, B Clerbaux, G De Lentdecker, V Dero, APR Gay, GH Hammad, T Hreus, A Léonard, PE Marage, L Thomas, C Vander Velde, P Vanlaer, J Wickens, V Adler, K Beernaert, A Cimmino, S Costantini, M Grunewald, B Klein, J Lellouch, A Marinov, J Mccartin, D Ryckbosch, N Strobbe, F Thyssen, M Tytgat, L Vanelderen, P Verwilligen, S Walsh, N Zaganidis, S Basegmez, G Bruno, J Caudron, L Ceard, J De Favereau De Jeneret, C Delaere, D Favart

Abstract:

Yields of prompt and non-prompt J/ψ, as well as Y(1S) mesons, are measured by the CMS experiment via their μ+μ- decays in PbPb and pp collisions at √/sNN = 2.76 TeV for quarkonium rapidity |y| < 2.4. Differential cross sections and nuclear modification factors are reported as functions of y and transverse momentum pT, as well as collision centrality. For prompt J/ψ with relatively high pT (6.5 < pT < 30 GeV/c), a strong, centrality-dependent suppression is observed in PbPb collisions, compared to the yield in pp collisions scaled by the number of inelastic nucleon-nucleon collisions. In the same kinematic range, a suppression of non-prompt J/ψ, which is sensitive to the in-medium b-quark energy loss, is measured for the first time. Also the low-pT Y(1S) mesons are suppressed in PbPb collisions. © CERN.
More details from the publisher

Top mass measurements at the Tevatron

Nuovo Cimento della Societa Italiana di Fisica C 35:3 (2012) 103-106

Abstract:

First observed in 1995, the top quark is the third-generation uptype quark of the standard model of particle physics (SM). The CDF and DØ collaborations have analyzed many tt̄ events produced by the Tevatron collider, studying many properties of the top quark. Among these, the mass of the top quark is a fundamental parameter of the SM, since its value constrains the mass of the yet to be observed Higgs boson. The analyzed events were used to measure the mass of the top quark mt ≃ 173.2 GeV/c2 with an uncertainty of less than 1 GeV/c2. We report on the latest top mass measurements at the Tevatron, using up to 6 fb-1 of data for each experiment.
More details from the publisher

A Large Hadron Electron Collider at CERN

JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS 39:7 (2012) ARTN 075001

Authors:

JL Abelleira Fernandez, C Adolphsen, AN Akay, H Aksakal, JL Albacete, 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 Bluemlein, H Boettcher, A Bogacz, C Bracco, G Brandt, H Braun, S Brodsky, O Bruening, E Bulyak, A Buniatyan, H Burkhardt, IT Cakir, O Cakir, R Calaga, V Cetinkaya, E Ciapala, R Ciftci, AK Ciftci, BA Cole, JC Collins, O Dadoun, J Dainton, A De Roeck, D d'Enterria, A Dudarev, A Eide, R Enberg, E Eroglu, KJ Eskola, L Favart, M Fitterer, S Forte, A Gaddi, P Gambino, H Garcia Morales, T Gehrmann, P Gladkikh, C Glasman, R Godbole, B Goddard, T Greenshaw, A Guffanti, V Guzey, C Gwenlan, T Han, Y Hao, F Haug, W Herr, A Herve, BJ Holzer, M Ishitsuka, M Jacquet, B Jeanneret, JM Jimenez, JM Jowett, H Jung, H Karadeniz, D Kayran, A Kilic, K Kimura, M Klein, U Klein, T Kluge, F Kocak, M Korostelev, A Kosmicki, P Kostka, H Kowalski, 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, 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, R Rohini, J Rojo, S Russenschuck, M Sahin, CA Salgado, K Sampei, R Sassot, E Sauvan, U Schneekloth, T Schoerner-Sadenius, D Schulte, A Senol, A Seryi, P Sievers, AN Skrinsky, W Smith, 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, K Tokushuku, R Tomas Garcia, D Tommasini, D Trbojevic, N Tsoupas, J Tuckmantel, S Turkoz, TN Trinh, K Tywoniuk, G Unel, 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 Zomer
More details from the publisher

A Large Hadron Electron Collider at CERN: Report on the Physics and Design Concepts for Machine and Detector

J.Phys. G39 (2012) 075001-075001

Authors:

JL Abelleira Fernandez, others
More details from the publisher