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Measurement of WW Production and Search for the Higgs Boson in pp Collisions at sqrt(s) = 7 TeV

ArXiv 1102.5429 (2011)

51猎奇入口 of Z boson production in PbPb collisions at nucleon-nucleon centre of mass energy = 2.76 TeV

ArXiv 1102.5435 (2011)

Brief Reports 纬(1 S) 鈫捨砯2鈥(1525); F2鈥(1525)鈫 KS0KS0, decays.

Physical Review D - Particles, Fields, Gravitation and Cosmology 83:3 (2011)

Authors:

D Besson, DP Hogan, TK Pedlar, D Cronin-Hennessy, J Hietala, P Zweber, S Dobbs, Z Metreveli, KK Seth, A Tomaradze, T Xiao, S Brisbane, L Martin, A Powell, P Spradlin, G Wilkinson, H Mendez, JY Ge, DH Miller, IPJ Shipsey, B Xin, GS Adams, D Hu, B Moziak, J Napolitano, KM Ecklund, J Insler, H Muramatsu, CS Park, LJ Pearson, EH Thorndike, F Yang, S Ricciardi, C Thomas, M Artuso, S Blusk, R Mountain, T Skwarnicki, S Stone, JC Wang, LM Zhang, G Bonvicini, D Cinabro, A Lincoln, MJ Smith, P Zhou, J Zhu, P Naik, J Rademacker, DM Asner, KW Edwards, K Randrianarivony, G Tatishvili, RA Briere, H Vogel, PUE Onyisi, JL Rosner, JP Alexander, DG Cassel, S Das, R Ehrlich, L Fields, L Gibbons, SW Gray, DL Hartill, BK Heltsley, DL Kreinick, VE Kuznetsov, JR Patterson, D Peterson, D Riley, A Ryd, AJ Sadoff, X Shi, WM Sun, J Yelton, P Rubin, N Lowrey, S Mehrabyan, M Selen, J Wiss, J Libby, M Kornicer, RE Mitchell, CM Tarbert

Abstract:

We report on a study of exclusive radiative decays of the 违(1S) resonance into a final state consisting of a photon and two KS0 candidates. We find evidence for a signal for 违(1S)鈫捨砯2鈥(1525); f2鈥(1525)鈫捨矺S0KS0, at a rate B(违(1S) 鈫捨砯2鈥(1525))=(4.0卤1.3卤0.6)脳10-5, consistent with previous observations of 违(1S)鈫捨砯2鈥(1525) ; f2鈥(1525)鈫扠+K-, and isospin. Combining this branching fraction with existing branching fraction measurements of 违(1S)鈫捨砯2鈥(1525) and J/蠄鈫捨砯2鈥(1525), we obtain the ratio of branching fractions: B(违(1S) 鈫捨砯2鈥(1525))/B(J/蠄鈫捨砯2鈥(1525))=0. 09卤0.02, approximately consistent with expectations based on soft-collinear effective theory. 漏 2011 American Physical Society.

Measurement of the isolated prompt photons production cross section in pp collisions at 鈭歴=7TeV

Physical Review Letters 106:8 (2011)

Authors:

V Khachatryan, AM Sirunyan, A Tumasyan, W Adam, T Bergauer, M Dragicevic, J Er枚, C Fabjan, M Friedl, R Fr眉hwirth, VM Ghete, J Hammer, S H盲nsel, C Hartl, M Hoch, N H枚rmann, J Hrubec, M Jeitler, G Kasieczka, W Kiesenhofer, M Krammer, D Liko, I Mikulec, M Pernicka, H Rohringer, R Sch枚fbeck, J Strauss, A Taurok, F Teischinger, W Waltenberger, G Walzel, E Widl, CE Wulz, V Mossolov, N Shumeiko, J Suarez Gonzalez, L Benucci, L Ceard, K Cerny, EA De Wolf, X Janssen, T Maes, L Mucibello, S Ochesanu, B Roland, R Rougny, M Selvaggi, H Van Haevermaet, P Van Mechelen, N Van Remortel, V Adler, S Beauceron, F Blekman, S Blyweert, J D'Hondt, O Devroede, R Gonzalez Suarez, A Kalogeropoulos, J Maes, M Maes, S Tavernier, 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, PE Marage, L Thomas, C Vander Velde, P Vanlaer, J Wickens, S Costantini, M Grunewald, B Klein, A Marinov, J McCartin, D Ryckbosch, F Thyssen, M Tytgat, L Vanelderen, P Verwilligen, S Walsh, N Zaganidis, S Basegmez, G Bruno, J Caudron, J De Favereau De Jeneret, C Delaere, P Demin, D Favart, A Giammanco, G Gr茅goire, J Hollar, V Lemaitre

Abstract:

The differential cross section for the inclusive production of isolated prompt photons has been measured as a function of the photon transverse energy ET纬 in pp collisions at 鈭歴=7TeV using data recorded by the CMS detector at the LHC. The data sample corresponds to an integrated luminosity of 2.9pb-1. Photons are required to have a pseudorapidity |畏纬|<1.45 and ET纬>21GeV, covering the kinematic region 0.006

Measurement of tt虅 spin correlation in pp虅 collisions using the CDF II detector at the Tevatron

Physical Review D - Particles, Fields, Gravitation and Cosmology 83:3 (2011)

Authors:

T Aaltonen, B 脕lvarez Gonz谩lez, S Amerio, D Amidei, A Anastassov, A Annovi, J Antos, G Apollinari, JA Appel, A Apresyan, T Arisawa, A Artikov, J Asaadi, W Ashmanskas, B Auerbach, A Aurisano, F Azfar, W Badgett, A Barbaro-Galtieri, VE Barnes, BA Barnett, P Barria, P Bartos, M Bauce, G Bauer, F Bedeschi, D Beecher, S Behari, G Bellettini, J Bellinger, D Benjamin, A Beretvas, A Bhatti, M Binkley, D Bisello, I Bizjak, KR Bland, B Blumenfeld, A Bocci, A Bodek, D Bortoletto, J Boudreau, A Boveia, B Brau, L Brigliadori, A Brisuda, C Bromberg, E Brucken, M Bucciantonio, J Budagov, HS Budd, S Budd, K Burkett, G Busetto, P Bussey, A Buzatu, C Calancha, S Camarda, M Campanelli, M Campbell, F Canelli, A Canepa, B Carls, D Carlsmith, R Carosi, S Carrillo, S Carron, B Casal, M Casarsa, A Castro, P Catastini, D Cauz, V Cavaliere, M Cavalli-Sforza, A Cerri, L Cerrito, YC Chen, M Chertok, G Chiarelli, G Chlachidze, F Chlebana, K Cho, D Chokheli, JP Chou, WH Chung, YS Chung, CI Ciobanu, MA Ciocci, A Clark, G Compostella, ME Convery, J Conway, M Corbo, M Cordelli, CA Cox, DJ Cox, F Crescioli, C Cuenca Almenar, J Cuevas, R Culbertson

Abstract:

The tt虅 spin correlation at production is a fundamental prediction of QCD and a potentially incisive test of new physics coupled to top quarks. We measure the tt虅 spin state in pp虅 collisions at 鈭歴=1.96TeV using 1001 candidate events in the lepton plus jets decay channel reconstructed in the CDF II detector. In the helicity basis, for a top-quark mass of 172.5GeV/c2, we find a spin correlation coefficient 魏=0.60卤0.50(stat)卤0. 16(syst), consistent with the QCD prediction, 魏 0.40. 漏 2011 American Physical Society.