Please use this identifier to cite or link to this item: http://bura.brunel.ac.uk/handle/2438/7341
Title: Observation of Z decays to four leptons with the CMS detector at the LHC
Authors: Chatrchyan, S
Khachatryan, V
Sirunyan, AM
Tumasyan, A
Adam, W
Aguilo, E
Bergauer, T
Dragicevic, M
Ero, J
Fabjan, C
Friedl, M
Pashenkov, A
Cheung, HWK
Kellogg, RG
Paramatti, R
Shi, X
Kirn, M
Kolberg, T
Behrenhoff, W
Lu, Y
Marionneau, M
Balazs, M
Tlisov, D
Tuominiemi, J
Sperka, D
Merola, M
Codispoti, G
Mignerey, AC
Pedro, K
Shiu, JG
Bodek, A
Palla, F
Peterman, A
Toropin, A
Hrubec, J
Sanchez, MCDLB
Skuja, A
Rahatlou, S
Temple, J
Sulak, L
Wang, D
Jo, M
Tzeng, YM
Tonjes, MB
Puljak, I
Tonwar, SC
Twedt, E
Tuovinen, E
Apyan, A
Behrens, U
de Troconiz, JF
Liang, D
Bauer, G
Chung, YS
Alimena, J
Haley, J
Marlow, D
Bendavid, J
De Cosa, A
Kroeger, R
Ranjan, K
Sigamani, M
Busza, W
Bergholz, M
Butz, E
Cali, IA
Quertenmont, L
Chan, M
Zhang, L
Meyer, A
Miller, DH
Spiegel, L
Troshin, S
Dutta, V
Ceballos, GG
Goncharov, M
Sharma, V
Delaere, C
Schizzi, A
Brun, H
Covarelli, R
Soffi, L
Zang, J
Auzinger, G
Hahn, KA
Kim, Y
Klute, M
Kalogeropoulos, A
Flacher, H
Krajczar, K
Chlebana, F
Li, W
Gouzevitch, M
Etesami, SM
Luckey, PD
Ungaro, D
Wan, X
Shivpuri, RK
Ma, T
Tcholakov, V
Zhu, B
Nahn, S
Paus, C
Hammad, GH
Saha, A
Morovic, S
Nuttens, C
Wendland, L
D'Enterria, D
Wang, M
Caudron, J
Ralph, D
Elvira, VD
Roland, C
Barberis, E
Banerjee, S
Roland, G
Rudolph, M
Stephans, GSF
Das, S
Bhattacharya, S
Klukas, J
Speer, T
Stoeckli, F
Mundim, L
Malik, S
Sumorok, K
Sung, K
Pearson, T
Zou, W
de Barbaro, P
Fisk, I
Ozdemir, K
Epshteyn, V
Godinovic, N
Velicanu, D
Fernandez Menendez, J
Giunta, M
Cutts, D
Bethani, A
Demina, R
Marco, J
Eshaq, Y
Garcia-Bellido, A
Gasparini, U
Boutle, S
Banzuzi, K
Goldenzweig, P
Han, J
Amapane, N
Harel, A
Evans, D
Bhattacharya, S
Freeman, J
Janssen, X
Erofeeva, M
Vodopiyanov, I
Miner, DC
Karjalainen, A
Vishnevskiy, D
Zielinski, M
Avila, C
Attikis, A
Bhatti, A
Adiguzel, A
Zhokin, A
Delgado Peris, A
Marco, R
Ciesielski, R
Borras, K
Korpela, A
Dutta, S
Genchev, V
Arcidiacono, R
Gao, Y
Demortier, L
Goulianos, K
Sellers, P
Bakirci, MN
Lungu, G
Malik, S
Mesropian, C
Lincoln, D
Dahmes, B
Burgmeier, A
Arora, S
Barker, A
Ferapontov, A
Gavrilov, V
Guida, R
Chou, JP
Cerci, S
Galanti, M
Green, D
Hollar, J
Argiro, S
Fruhwirth, R
Contreras-Campana, C
Rodozov, M
Kossov, M
Contreras-Campana, E
Duggan, D
Ferencek, D
Heintz, U
Lannon, K
Gershtein, Y
Tuuva, T
Chen, M
De Benedetti, A
Gray, R
Lychkovskaya, N
Halkiadakis, E
Fernandez Bedoya, C
Sharma, S
Hidas, D
Klein, B
Lath, A
Dugad, S
Hauk, J
Panwalkar, S
Mendez, H
Cavallari, F
Pin, A
Mavromanolakis, G
Van Doninck, W
Park, M
Patel, R
Cakir, A
Rekovic, V
Franzoni, G
Slaunwhite, J
Dozen, C
Checchia, P
Daskalakis, G
Gutsche, O
Robles, J
Rose, K
Jabeen, S
Arneodo, M
Salur, S
Schnetzer, S
Gomber, B
Belforte, S
Rohringer, H
Gokbulut, G
Calligaris, L
Leonidov, A
Seitz, C
Somalwar, S
Martinez Rivero, C
Stone, R
Mikulec, I
Rizzi, A
Kukartsev, G
Mousa, J
Foudas, C
Besancon, M
Gude, A
Thomas, S
Dumanoglu, I
Campbell, A
Biino, C
Kim, H
Cerizza, G
Hollingsworth, M
Spanier, S
Popov, V
Yang, ZC
Ille, B
Ozturk, S
York, A
Palinkas, J
Eusebi, R
Albrow, M
Hanlon, J
Villella, I
Matorras, F
Dietz-Laursonn, E
Flanagan, W
Gilmore, J
Jain, S
Choudhury, S
Kao, SC
Dogangun, O
Cartiglia, N
Kamon, T
Guragain, S
Laird, E
Ekmedzic, M
Nicolaou, C
Castro, E
Khotilovich, V
Montalvo, R
Perera, L
Harris, RM
Osipenkov, I
Pakhotin, Y
Martschei, D
Jain, S
Safronov, G
Eskut, E
Perloff, A
Roe, J
Landsberg, G
Heo, SG
Mucia, N
Munoz Sanchez, FJ
Safonov, A
Costa, M
Klapoetke, K
Semenov, S
Sakuma, T
Sengupta, S
Golf, F
Neumeister, N
Suarez, I
Khurana, R
Dejardin, M
Ptochos, F
Costanza, F
Lynch, S
Duarte Campderros, J
Tatarinov, A
Toback, D
Akchurin, N
Damgov, J
Evangelou, I
Dudero, PR
Demaria, N
Baillon, P
Rodrigo, T
Kubota, Y
Stolin, V
Hirschauer, J
Dammann, D
Sarkar, S
Luk, M
Jeong, C
Kovitanggoon, K
Medvedeva, T
Lee, SW
Denegri, D
Libeiro, T
Konoplyanikov, V
Racz, A
Roh, Y
Razis, PA
Volobouev, I
Appelt, E
Snow, GR
Mariotti, C
Florez, C
Adair, A
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Gyun, D
Gozzelino, A
Sharan, M
Liang, S
Greene, S
Mans, J
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Gurrola, A
Johns, W
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Wright, D
Chetluru, V
Organtini, G
Baden, A
Boutemeur, M
Onengut, G
Albajar, C
Calvert, B
Kailas, S
Eno, SC
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Keywords: Hadron-Hadron Scattering
Issue Date: 2012
Publisher: Springer-Verlag
Citation: Journal of High Energy Physics 2012: 034, Dec 2012
Abstract: The first observation of the Z boson decaying to four leptons in proton-proton collisions is presented. The analyzed data set corresponds to an integrated luminosity of 5.02 inverse femtobarns at sqrt(s) = 7 TeV collected by the CMS detector at the Large Hadron Collider. A pronounced resonance peak, with a statistical significance of 9.7 sigma, is observed in the distribution of the invariant mass of four leptons (electrons and/or muons) with mass and width consistent with expectations for Z boson decays. The branching fraction and cross section reported here are defined by phase space restrictions on the leptons, namely, 80 < m[4l] < 100 GeV, where m[4l] is the invariant mass of the four leptons, and m[ll] > 4 GeV for all pairs of leptons, where m[ll] is the two-lepton invariant mass. The measured branching fraction is B(Z to 4l) = (4.2 /+0.9/-0.8 (stat.) +/- 0.2 (syst.)) 10E-6 and agrees with the standard model prediction of 4.45 10E-6. The measured cross section times branching fraction is sigma(pp to Z) B(Z to 4 l) = 112 +23/-20 (stat.) +7/-5 (syst.) +3/-2 (lumi.) fb, also consistent with the standard model prediction of 120 fb. The four-lepton mass peak arising from Z to 4 l decays provides a calibration channel for the Higgs boson search in the H to ZZ to 4 l decay mode.
Description: This is the pre-print version of the Article. The official published version can be accessed from the links below - Copyright @ 2012 Springer-Verlag
URI: http://link.springer.com/article/10.1007%2FJHEP12%282012%29034
http://bura.brunel.ac.uk/handle/2438/7341
DOI: http://dx.doi.org/10.1007/JHEP12(2012)034
ISSN: 1126-6708
Appears in Collections:Electronic and Computer Engineering
Dept of Electronic and Computer Engineering Research Papers

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