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Measurement of the pp→ZZ production cross section and constraints on anomalous triple gauge couplings in four-lepton final states at s=8 TeV
, Article Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics ; Volume 740 , January , 2015 , Pages 250-272 ; 03702693 (ISSN) ; Sirunyan, A. M ; Tumasyan, A ; Adam, W ; Bergauer, T ; Dragicevic, M ; Erö, J ; Fabjan, C ; Friedl, M ; Frühwirth, R ; Ghete, V. M ; Hartl, C ; Hörmann, N ; Hrubec, J ; Jeitler, M ; Kiesenhofer, W ; Knünz, V ; Krammer, M ; Krätschmer, I ; Liko, D ; Mikulec, I ; Rabady, D ; Rahbaran, B ; Rohringer, H ; Schöfbeck, R ; Strauss, J ; Taurok, A ; Treberer Treberspurg, W ; Waltenberger, W ; Wulz, C. E ; Mossolov, V ; Shumeiko, N ; Suarez Gonzalez, J ; Alderweireldt, S ; Bansal, M ; Bansal, S ; Cornelis, T ; De Wolf, E. A ; Janssen, X ; Knutsson, A ; Luyckx, S ; Ochesanu, S ; Roland, B ; Rougny, R ; Van De Klundert, M ; Van Haevermaet, H ; Van Mechelen, P ; Van Remortel, N ; Van Spilbeeck, A ; Blekman, F ; Blyweert, S ; D'Hondt, J ; Daci, N ; Heracleous, N ; Kalogeropoulos, A ; Keaveney, J ; Kim, T.J ; Lowette, S ; Maes, M ; Olbrechts, A ; Python, Q ; Strom, D ; Tavernier, S ; Van Doninck, W ; Van Mulders, P ; Van Onsem, G. P ; Villella, I ; Caillol, C ; Clerbaux, B ; De Lentdecker, G ; Dobur, D ; Favart, L ; Gay, A. P. R ; Grebenyuk, A ; Léonard, A ; Mohammadi, A ; Perniè, L ; Reis, T ; Seva, T ; Thomas, L ; Vander Velde, C ; Vanlaer, P ; Wang, J ; Adler, V ; Beernaert, K ; Benucci, L ; Cimmino, A ; Costantini, S ; Crucy, S ; Dildick, S ; Fagot, A ; Garcia, G ; Klein, B ; Mccartin, J ; Ocampo Rios, A. A ; Ryckbosch, D ; Salva Diblen, S ; Sigamani, M ; Strobbe, N ; Thyssen, F ; Tytgat, M ; Yazgan, E ; Zaganidis, N ; Basegmez, S ; Beluffi, C ; Bruno, G ; Castello, R ; Caudron, A ; Ceard, L ; Da Silveira, G. G ; Delaere, C ; du Pree, T ; Favart, D ; Forthomme, L ; Giammanco, A ; Hollar, J ; Jez, P ; Komm, M ; Lemaitre, V ; Liao, J ; Nuttens, C ; Pagano, D ; Pin, A ; Piotrzkowski, K ; Popov, A ; Quertenmont, L ; Selvaggi, M ; Vidal Marono, M ; Vizan Garcia, J. M ; Beliy, N ; Caebergs, T ; Daubie, E ; Hammad, G. H ; Alves, G. A ; Correa Martins Junior, M ; Dos Reis Martins, T ; Pol, M.E ; Aldá Júnior, W. L ; Carvalho, W ; Chinellato, J ; Custódio, A ; Da Costa, E. M ; De Jesus Damiao, D ; De Oliveira Martins, C ; Fonseca De Souza, S ; Malbouisson, H ; Malek, M ; Matos Figueiredo, D ; Mundim, L ; Nogima, H ; Prado Da Silva, W. L ; Santaolalla, J ; Santoro, A ; Sznajder, A ; Tonelli Manganote, E. J ; Vilela Pereira, A ; Bernardes, C. A ; Dias, F. A ; Fernandez Perez Tomei, T. R ; Gregores, E. M ; Mercadante, P. G ; Novaes, S. F ; Padula, S. S ; Aleksandrov, A ; Genchev, V ; Iaydjiev, P ; Marinov, A ; Piperov, S ; Rodozov, M ; Sultanov, G ; Vutova, M ; Dimitrov, A ; Glushkov, I ; Hadjiiska, R ; Kozhuharov, V ; Litov, L ; Pavlov, B ; Petkov, P ; Bian, J. G ; Chen, G. M ; Chen, H. S ; Chen, M ; Du, R ; Jiang, C. H ; Liang, D ; Liang, S ; Plestina, R ; Tao, J ; Wang, X ; Wang, Z ; Asawatangtrakuldee, C ; Ban, Y ; Guo, Y ; Li, Q ; Li, W ; Liu, S ; Mao, Y ; Qian, S. J ; Wang, D ; Zhang, L ; Zou, W ; Avila, C ; Chaparro Sierra, L.F ; Florez, C ; Gomez, J. P ; Gomez Moreno, B ; Sanabria, J. C ; Godinovic, N ; Lelas, D ; Polic, D ; Puljak, I ; Antunovic, Z ; Kovac, M ; Brigljevic, V ; Kadija, K ; Luetic, J ; Mekterovic, D ; Sudic, L ; Attikis, A ; Mavromanolakis, G ; Mousa, J ; Nicolaou, C ; Ptochos, F ; Razis, P. A ; Bodlak, M ; Finger, M ; Finger, M ; Assran, Y ; Ellithi Kamel, A ; Mahmoud, M. A ; Radi, A ; Kadastik, M ; Murumaa, M ; Raidal, M ; Tiko, A ; Eerola, P ; Fedi, G ; Voutilainen, M ; Härkönen, J ; Karimäki, V ; Kinnunen, R ; Kortelainen, M. J ; Lampén, T ; Lassila Perini, K ; Lehti, S ; Lindén, T ; Luukka, P ; Mäenpää, T ; Peltola, T ; Tuominen, E ; Tuominiemi, J ; Tuovinen, E ; Wendland, L ; Tuuva, T ; Besancon, M ; Couderc, F ; Dejardin, M ; Denegri, D ; Fabbro, B ; Faure, J. L ; Favaro, C ; Ferri, F ; Ganjour, S ; Givernaud, A ; Gras, P ; Hamel de Monchenault, G ; Jarry, P ; Locci, E ; Malcles, J ; Nayak, A ; Rander, J ; Rosowsky, A ; Titov, M ; Baffioni, S ; Beaudette, F ; Busson, P ; Charlot, C ; Dahms, T ; Dalchenko, M ; Dobrzynski, L ; Filipovic, N ; Florent, A ; Granier de Cassagnac, R ; Mastrolorenzo, L ; Miné, P ; Mironov, C ; Naranjo, I. N ; Nguyen, M ; Ochando, C ; Paganini, P ; Salerno, R ; Sauvan, J. B ; Sirois, Y ; Veelken, C ; Yilmaz, Y ; Zabi, A ; Agram, J. L ; Andrea, J ; Aubin, A ; Bloch, D ; Brom, J. M ; Chabert, E. C ; Collard, C ; Conte, E ; Fontaine, J. C ; Gelé, D ; Goerlach, U ; Goetzmann, C ; Le Bihan, A. C ; Van Hove, P ; Gadrat, S ; Beauceron, S ; Beaupere, N ; Boudoul, G ; Brochet, S ; Carrillo Montoya, C. A ; Chasserat, J ; Chierici, R ; Contardo, D ; Depasse, P ; El Mamouni, H ; Fan, J ; Fay, J ; Gascon, S ; Gouzevitch, M ; Ille, B ; Kurca, T ; Lethuillier, M ; Mirabito, L ; Perries, S ; Ruiz Alvarez, J. D ; Sabes, D ; Sgandurra, L ; Sordini, V ; Vander Donckt, M ; Verdier, P ; Viret, S ; Xiao, H ; Tsamalaidze, Z ; Autermann, C ; Beranek, S ; Bontenackels, M ; Calpas, B ; Edelhoff, M ; Feld, L ; Hindrichs, O ; Klein, K ; Ostapchuk, A ; Perieanu, A ; Raupach, F ; Sammet, J ; Schael, S ; Sprenger, D ; Weber, H ; Wittmer, B ; Zhukov, V ; Ata, M ; Caudron, J ; Dietz Laursonn, E ; Duchardt, D ; Erdmann, M ; Fischer, R ; Güth, A ; Hebbeker, T ; Heidemann, C ; Hoepfner, K ; Klingebiel, D ; Knutzen, S ; Kreuzer, P ; Merschmeyer, M ; Meyer, A ; Olschewski, M ; Padeken, K ; Papacz, P ; Reithler, H ; Schmitz, S. A ; Sonnenschein, L ; Teyssier, D ; Thüer, S ; Weber, M ; Cherepanov, V ; Erdogan, Y ; Flügge, G ; Geenen, H ; Geisler, M ; Haj Ahmad, W ; Hoehle, F ; Kargoll, B ; Kress, T ; Kuessel, Y ; Lingemann, J ; Nowack, A ; Nugent, I. M ; Perchalla, L ; Pooth, O ; Stahl, A ; Asin, I ; Bartosik, N ; Behr, J ; Behrenhoff, W ; Sharif University of Technology
Elsevier
2015
Abstract
A measurement of the inclusive ZZ production cross section and constraints on anomalous triple gauge couplings in proton-proton collisions at s=8 TeV are presented. The analysis is based on a data sample, corresponding to an integrated luminosity of 19.6fb -1, collected with the CMS experiment at the LHC. The measurements are performed in the leptonic decay modes ZZ→ℓℓℓ ' ℓ ', where ℓ = e, μ and ℓ ' = e, μ, τ. The measured total cross section σ(pp→ZZ)=7.7±0.5 (stat)-0.4+0.5 (syst)±0.4(theo)±0.2 (lumi) pb, for both Z bosons produced in the mass range 60 < mZ < 120 GeV, is consistent with standard model predictions. Differential cross sections are measured and well described by the theoretical...
Differential cross section measurements for the production of a W boson in association with jets in proton-proton collisions at s = 7 TeV
, Article Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics ; Volume 741 , 2015 , Pages 12-37 ; 03702693 (ISSN) ; Sirunyan, A. M ; Tumasyan, A ; Adam, W ; Bergauer, T ; Dragicevic, M ; Ero, J ; Fabjan, C ; Friedl, M ; Fruhwirth, R ; Ghete, V. M ; Hartl, C ; Hormann, N ; Hrubec, J ; Jeitler, M ; Kiesenhofer, W ; Knunz, V ; Krammer, M ; Kratschmer, I ; Liko, D ; Mikulec, I ; Rabady, D ; Rahbaran, B ; Rohringer, H ; Schofbeck, R ; Strauss, J ; Taurok, A ; Treberer Treberspurg, W ; Waltenberger, W ; Wulz, C. E ; Mossolov, V ; Shumeiko, N ; Suarez Gonzalez, J ; Alderweireldt, S ; Bansal, M ; Bansal, S ; Cornelis, T ; De Wolf, E. A ; Janssen, X ; Knutsson, A ; Luyckx, S ; Ochesanu, S ; Roland, B ; Rougny, R ; Van De Klundert, M ; Van Haevermaet, H ; Van Mechelen, P ; Van Remortel, N ; Van Spilbeeck, A ; Blekman, F ; Blyweert, S ; D'Hondt, J ; Daci, N ; Heracleous, N ; Kalogeropoulos, A ; Keaveney, J ; Kim, T.J ; Lowette, S ; Maes, M ; Olbrechts, A ; Python, Q ; Strom, D ; Tavernier, S ; Van Doninck, W ; Van Mulders, P ; Van Onsem, G.P ; Villella, I ; Caillol, C ; Clerbaux, B ; De Lentdecker, G ; Dobur, D ; Favart, L ; Gay, A.P.R ; Grebenyuk, A ; Léonard, A ; Mohammadi, A ; Perniè, L ; Reis, T ; Seva, T ; Thomas, L ; Vander Velde, C ; Vanlaer, P ; Wang, J ; Adler, V ; Beernaert, K ; Benucci, L ; Cimmino, A ; Costantini, S ; Crucy, S ; Dildick, S ; Fagot, A ; Garcia, G ; Klein, B ; Mccartin, J ; Ocampo Rios, A.A ; Ryckbosch, D ; Salva Diblen, S ; Sigamani, M ; Strobbe, N ; Thyssen, F ; Tytgat, M ; Yazgan, E ; Zaganidis, N ; Basegmez, S ; Beluffi, C ; Bruno, G ; Castello, R ; Caudron, A ; Ceard, L ; Da Silveira, G.G ; Delaere, C ; du Pree, T ; Favart, D ; Forthomme, L ; Giammanco, A ; Hollar, J ; Jez, P ; Komm, M ; Lemaitre, V ; Liao, J ; Nuttens, C ; Pagano, D ; Perrini, L ; Pin, A ; Piotrzkowski, K ; Popov, A ; Quertenmont, L ; Selvaggi, M ; Vidal Marono, M ; Vizan Garcia, J.M ; Beliy, N ; Caebergs, T ; Daubie, E ; Hammad, G.H ; Aldá Júnior, W.L ; Alves, G.A ; Correa Martins Junior, M ; Dos Reis Martins, T ; Pol, M.E ; Carvalho, W ; Chinellato, J ; Custódio, A ; Da Costa, E.M ; De Jesus Damiao, D ; De Oliveira Martins, C ; Fonseca De Souza, S ; Malbouisson, H ; Malek, M ; Matos Figueiredo, D ; Mundim, L ; Nogima, H ; Prado Da Silva, W.L ; Santaolalla, J ; Santoro, A ; Sznajder, A ; Tonelli Manganote, E.J ; Vilela Pereira, A ; Bernardes, C.A ; Dias, F.A ; Fernandez Perez Tomei, T.R ; Gregores, E.M ; Mercadante, P.G ; Novaes, S.F ; Padula, S.S ; Aleksandrov, A ; Genchev, V ; Iaydjiev, P ; Marinov, A ; Piperov, S ; Rodozov, M ; Sultanov, G ; Vutova, M ; Dimitrov, A ; Glushkov, I ; Hadjiiska, R ; Kozhuharov, V ; Litov, L ; Pavlov, B ; Petkov, P ; Bian, J.G ; Chen, G.M ; Chen, H.S ; Chen, M ; Du, R ; Jiang, C.H ; Liang, D ; Liang, S ; Plestina, R ; Tao, J ; Wang, X ; Wang, Z ; Asawatangtrakuldee, C ; Ban, Y ; Guo, Y ; Li, Q ; Li, W ; Liu, S ; Mao, Y ; Qian, S.J ; Wang, D ; Zhang, L ; Zou, W ; Avila, C ; Chaparro Sierra, L.F ; Florez, C ; Gomez, J.P ; Gomez Moreno, B ; Sanabria, J.C ; Godinovic, N ; Lelas, D ; Polic, D ; Puljak, I ; Antunovic, Z ; Kovac, M ; Brigljevic, V ; Kadija, K ; Luetic, J ; Mekterovic, D ; Sudic, L ; Attikis, A ; Mavromanolakis, G ; Mousa, J ; Nicolaou, C ; Ptochos, F ; Razis, P.A ; Bodlak, M ; Finger, M ; Finger, M ; Assran, Y ; Ellithi Kamel, A ; Mahmoud, M.A ; Radi, A ; Kadastik, M ; Murumaa, M ; Raidal, M ; Tiko, A ; Eerola, P ; Fedi, G ; Voutilainen, M ; Härkönen, J ; Karimäki, V ; Kinnunen, R ; Kortelainen, M.J ; Lampén, T ; Lassila-Perini, K ; Lehti, S ; Lindén, T ; Luukka, P ; Mäenpää, T ; Peltola, T ; Tuominen, E ; Tuominiemi, J ; Tuovinen, E ; Wendland, L ; Tuuva, T ; Besancon, M ; Couderc, F ; Dejardin, M ; Denegri, D ; Fabbro, B ; Faure, J.L ; Favaro, C ; Ferri, F ; Ganjour, S ; Givernaud, A ; Gras, P ; Hamel de Monchenault, G ; Jarry, P ; Locci, E ; Malcles, J ; Rander, J ; Rosowsky, A ; Titov, M ; Baffioni, S ; Beaudette, F ; Busson, P ; Charlot, C ; Dahms, T ; Dalchenko, M ; Dobrzynski, L ; Filipovic, N ; Florent, A ; Granier de Cassagnac, R ; Mastrolorenzo, L ; Miné, P ; Mironov, C ; Naranjo, I.N ; Nguyen, M ; Ochando, C ; Paganini, P ; Salerno, R ; Sauvan, J.B ; Sirois, Y ; Veelken, C ; Yilmaz, Y ; Zabi, A ; Agram, J.-L ; Andrea, J ; Aubin, A ; Bloch, D ; Brom, J.-M ; Chabert, E.C ; Collard, C ; Conte, E ; Fontaine, J.-C ; Gelé, D ; Goerlach, U ; Goetzmann, C ; Le Bihan, A.-C ; Van Hove, P ; Gadrat, S ; Beauceron, S ; Beaupere, N ; Boudoul, G ; Brochet, S ; Carrillo Montoya, C.A ; Chasserat, J ; Chierici, R ; Contardo, D ; Depasse, P ; El Mamouni, H ; Fan, J ; Fay, J ; Gascon, S ; Gouzevitch, M ; Ille, B ; Kurca, T ; Lethuillier, M ; Mirabito, L ; Perries, S ; Ruiz Alvarez, J.D ; Sabes, D ; Sgandurra, L ; Sordini, V ; Vander Donckt, M ; Verdier, P ; Viret, S ; Xiao, H ; Tsamalaidze, Z ; Autermann, C ; Beranek, S ; Bontenackels, M ; Edelhoff, M ; Feld, L ; Hindrichs, O ; Klein, K ; Ostapchuk, A ; Perieanu, A ; Raupach, F ; Sammet, J ; Schael, S ; Sprenger, D ; Weber, H ; Wittmer, B ; Zhukov, V ; Ata, M ; Dietz-Laursonn, E ; Duchardt, D ; Erdmann, M ; Fischer, R ; Güth, A ; Hebbeker, T ; Heidemann, C ; Hoepfner, K ; Klingebiel, D ; Knutzen, S ; Kreuzer, P ; Merschmeyer, M ; Meyer, A ; Olschewski, M ; Padeken, K ; Papacz, P ; Reithler, H ; Schmitz, S.A ; Sonnenschein, L ; Teyssier, D ; Thüer, S ; Weber, M ; Cherepanov, V ; Erdogan, Y ; Flügge, G ; Geenen, H ; Geisler, M ; Haj Ahmad, W ; Hoehle, F ; Kargoll, B ; Kress, T ; Kuessel, Y ; Lingemann, J ; Nowack, A ; Nugent, I. M ; Perchalla, L ; Pooth, O ; Stahl, A ; Asin, I ; Bartosik, N ; Behr, J ; Behrenhoff, W ; Behrens, U ; Bell, A.J ; Sharif University of Technology
Abstract
Measurements are reported of differential cross sections for the production of a W boson, which decays into a muon and a neutrino, in association with jets, as a function of several variables, including the transverse momenta (pT) and pseudorapidities of the four leading jets, the scalar sum of jet transverse momenta (HT), and the difference in azimuthal angle between the directions of each jet and the muon. The data sample of pp collisions at a centre-of-mass energy of 7 TeV was collected with the CMS detector at the LHC and corresponds to an integrated luminosity of 5.0 fb-1. The measured cross sections are compared to predictions from Monte Carlo generators, MadGraph+pythia and sherpa,...
Effects of Extra Dimensions on Electroweak Symmetry Breaking in Four Dimensions
, M.Sc. Thesis Sharif University of Technology ; Arfaei, Hessamaddin (Supervisor) ; Mohammadi Najafabadi, Mojtaba (Co-Advisor)
Abstract
Models wih extra dimensions have been among the most important models built for solving the problems of the standard model. In the standard model, Higgs mechanism is used to ex-plain electroweak symmetry breaking. One of the theoretical problems of the standard model,the hierchy problem, is about the Higgs mass being unnaturally small and models with extra dimensions have provided solutions to solve the problem. Moreover, extra dimensions pro-vide tools using which several models have been developed to explain electroweak symmetry breaking. In this thesis, acher reviewing the electroweak symmetry breaking sector of the stan-dard model, and the hierarchy problem, some models of electroweak...
Challenges Against The Front Grand Unified Theories
, M.Sc. Thesis Sharif University of Technology ; Golshani, Mehdi (Supervisor)
Abstract
Many physicists believed that all four forces were once unified at high energy levels but as the universe reduced into a lower-energy states the inherent symmetry between the forces began to break down.this broken symmetry caused the creation of four distinct forces of nature. The goal of the unified theory is an attempt to look back in time to when these forces where unified as one. In this thesis I tried to give an overview of the challenges which is againsted theorists in the way of unification. In the first chapter explores the theory that try to unify the electromagnetic and weak forces are investigated.it is done by considering guage principle and spontaneous symmetry breaking.in the...
Asymmetry Between Matter and Antimatter in the Universe
, M.Sc. Thesis Sharif University of Technology ; Golshani, Mehdi (Supervisor)
Abstract
Although the origin of matter-antimatter asymmetry remains unknown, continuing advances in theory and improved experimental limits have ruled out some scenarios for baryogenesis: for example, the sphaleron baryogenesis at the electroweak phase transition in the standard model. In this thesis, we give an introduction to some of the ideas and attempts to understand the origin of the matte -antimatter asymmetry of the universe. After the discussion of some basic issues of cosmology and particle theory, the scenarios of electroweak baryogenesis, GUT baryogenesis, and leptogenesis are outlined