Please use this identifier to cite or link to this item: http://buratest.brunel.ac.uk/handle/2438/10795
Title: Search for long-lived particles that decay into final states containing two electrons or two muons in proton-proton collisions at s =8TeV
Authors: Khachatryan, V
Sirunyan, AM
Tumasyan, A
Adam, W
Bergauer, T
Dragicevic, M
Erö, J
Friedl, M
Frühwirth, R
Ghete, VM
Hartl, C
Mendez, H
Simonetto, F
Torassa, E
Tosi, M
Ventura, S
Zotto, P
Zucchetta, A
Gabusi, M
Ratti, SP
Re, V
Levchenko, P
Ramirez Vargas, JE
Dordevic, M
Riccardi, C
Wang, J
Salvini, P
Vitulo, P
Biasini, M
Bilei, GM
Ciangottini, D
Fanò, L
Lariccia, P
Barnes, VE
Mantovani, G
Dorney, B
Menichelli, M
Saha, A
Zenoni, F
Santocchia, A
Spiezia, A
Androsov, K
Azzurri, P
Bagliesi, G
Benedetti, D
Bernardini, J
Boccali, T
Dupont-Sagorin, N
Broccolo, G
Castaldi, R
Ciocci, MA
Adler, V
Dell'Orso, R
Donato, S
Fiori, F
Bortoletto, D
Foà, L
Giassi, A
Grippo, MT
Elliott-Peisert, A
Ligabue, F
Lomtadze, T
Martini, L
Messineo, A
Beernaert, K
Moon, CS
De Mattia, M
Palla, F
Rizzi, A
Savoy-Navarro, A
Serban, AT
Eugster, J
Spagnolo, P
Squillacioti, P
Tenchini, R
Tonelli, G
Venturi, A
Gutay, L
Benucci, L
Verdini, PG
Vernieri, C
Barone, L
Cavallari, F
Franzoni, G
D'Imperio, G
Del Re, D
Diemoz, M
Jorda, C
Cabrera, A
Longo, E
Margaroli, F
Cimmino, A
Meridiani, P
Micheli, F
Nourbakhsh, S
Funk, W
Organtini, G
Paramatti, R
Rahatlou, S
Hu, Z
Rovelli, C
Santanastasio, F
Soffi, L
Traczyk, P
Costantini, S
Amapane, N
Arcidiacono, R
Gigi, D
Argiro, S
Arneodo, M
Jha, MK
Bellan, R
Biino, C
Cartiglia, N
Casasso, S
Costa, M
Degano, A
Crucy, S
Demaria, N
Gill, K
Finco, L
Chamizo Llatas, M
Fouz, MC
Mariotti, C
Maselli, S
Migliore, E
Monaco, V
Musich, M
Obertino, MM
Ortona, G
Pacher, L
Dildick, S
Nuttens, C
Jones, M
Pastrone, N
Pelliccioni, M
Pinna Angioni, GL
Potenza, A
Romero, A
Ruspa, M
Sacchi, R
Solano, A
Staiano, A
Tamponi, U
Jung, K
Murzin, V
Giordano, D
Fagot, A
Belforte, S
Candelise, V
Casarsa, M
Cossutti, F
Della Ricca, G
Gobbo, B
La Licata, C
Kress, M
Marone, M
Schizzi, A
Girone, M
Umer, T
Garcia, G
Zanetti, A
Chang, S
Kropivnitskaya, A
Nam, SK
Kim, DH
Leonardo, N
Kim, GN
Kim, MS
Kong, DJ
Glege, F
Lee, S
Oh, YD
McCartin, J
Park, H
Sakharov, A
Son, DC
Lopes Pegna, D
Kim, TJ
Kim, JY
Song, S
Choi, S
Guida, R
Gyun, D
Hong, B
Jo, M
Ocampo Rios, AA
Kim, H
Maroussov, V
Kim, Y
Lee, B
Lee, KS
Park, SK
Roh, Y
Gundacker, S
Yoo, HD
Choi, M
Kim, JH
Park, IC
Miller, DH
Ryckbosch, D
Ryu, G
Ryu, MS
Choi, Y
Choi, YK
Goh, J
Guthoff, M
Kim, D
Kwon, E
Lee, J
Neumeister, N
Yu, I
Juodagalvis, A
Salva Diblen, S
Komaragiri, JR
Md Ali, MAB
Casimiro Linares, E
Castilla-Valdez, H
Hammer, J
De La Cruz-Burelo, E
Heredia-De La Cruz, I
Chaparro Sierra, LF
Hernandez-Almada, A
Lopez-Fernandez, R
Sanchez-Hernandez, A
Carrillo Moreno, S
Sigamani, M
Vazquez Valencia, F
Pedraza, I
Salazar Ibarguen, HA
Hansen, M
Morelos Pineda, A
Nash, D
Radburn-Smith, BC
Krofcheck, D
Butler, PH
Reucroft, S
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Hassan, Q
Strobbe, N
Hoorani, HR
Khan, WA
Harris, P
Basegmez, S
Khurshid, T
Shoaib, M
Bialkowska, H
Bluj, M
Boimska, B
Frueboes, T
Górski, M
Kazana, M
Thyssen, F
Nawrocki, K
Favart, D
Hegeman, J
Romanowska-Rybinska, K
Szleper, M
Zalewski, P
Brona, G
Bunkowski, K
Cwiok, M
Dominik, W
Doroba, K
Kalinowski, A
Shi, X
Tytgat, M
Oreshkin, V
Pagano, D
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Kozlov, G
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Malakhov, A
Matveev, V
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Palichik, V
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Masetti, L
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Smirnov, I
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Pfeiffer, A
Pimiä, M
Piparo, D
Sulimov, V
Plagge, M
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Rolandi, G
Orimoto, T
Zablocki, J
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Sakulin, H
Schäfer, C
Schwick, C
Sharma, A
Siegrist, P
Uvarov, L
Silva, P
Simon, M
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Steggemann, J
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Gay, APR
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Fernández Ramos, JP
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Piroué, P
Guiducci, L
Marcellini, S
Masetti, G
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Navarria, FL
Perrotta, A
Primavera, F
Rossi, AM
Kim, V
D'Alfonso, M
Quan, X
Rovelli, T
Siroli, GP
Léonard, A
Tosi, N
Travaglini, R
Albergo, S
Cappello, G
Chiorboli, M
Costa, S
Giordano, F
Saka, H
D'Enterria, D
Potenza, R
Tricomi, A
Tuve, C
Mohammadi, A
Barbagli, G
Ciulli, V
Civinini, C
D'Alessandro, R
Focardi, E
Stickland, D
Gallo, E
Dabrowski, A
Gonzi, S
Gori, V
Lenzi, P
Meschini, M
Perniè, L
Paoletti, S
Sguazzoni, G
Tropiano, A
Tully, C
Benussi, L
Bianco, S
David, A
Fabbri, F
Piccolo, D
Ferretti, R
Ferro, F
Lo Vetere, M
Randle-Conde, A
Robutti, E
Werner, JS
Tosi, S
Dinardo, ME
Fiorendi, S
De Guio, F
Gennai, S
Gerosa, R
Ghezzi, A
Govoni, P
Lucchini, MT
Malvezzi, S
Avila, C
Reis, T
Manzoni, RA
Martelli, A
Marzocchi, B
De Roeck, A
Menasce, D
Moroni, L
Paganoni, M
Pedrini, D
Ragazzi, S
Zuranski, A
Redaelli, N
Tabarelli De Fatis, T
Seva, T
Buontempo, S
Cavallo, N
De Visscher, S
Di Guida, S
Fabozzi, F
Iorio, AOM
Lista, L
Brownson, E
Meola, S
Merola, M
Paolucci, P
Azzi, P
Thomas, L
Bacchetta, N
Di Marco, E
Biasotto, M
Bisello, D
Branca, A
Malik, S
Carlin, R
Checchia, P
Dall'Osso, M
Dorigo, T
Dosselli, U
Fanzago, F
Vander Velde, C
Lemaitre, V
Galanti, M
Gasparini, U
Flix, J
Giubilato, P
Gozzelino, A
Lacaprara, S
Margoni, M
Meneguzzo, AT
Pazzini, J
Pozzobon, N
Ronchese, P
Dobson, M
Vanlaer, P
Keywords: Proton-proton collisions;Long-lived particles;CMS detector
Issue Date: 2015
Publisher: American Physical Society
Citation: Physical Review D, 91: 052012, (2015)
Abstract: A search is performed for long-lived particles that decay into final states that include a pair of electrons or a pair of muons. The experimental signature is a distinctive topology consisting of a pair of charged leptons originating from a displaced secondary vertex. Events corresponding to an integrated luminosity of 19.6(20.5)fb-1 in the electron (muon) channel were collected with the CMS detector at the CERN LHC in proton-proton collisions at s=8TeV. No significant excess is observed above standard model expectations. Upper limits on the product of the cross section and branching fraction of such a signal are presented as a function of the long-lived particle's mean proper decay length. The limits are presented in an approximately model-independent way, allowing them to be applied to a wide class of models yielding the above topology. Over much of the investigated parameter space, the limits obtained are the most stringent to date. In the specific case of a model in which a Higgs boson in the mass range 125-1000GeV/c2 decays into a pair of long-lived neutral bosons in the mass range 20-350GeV/c2, each of which can then decay to dileptons, the upper limits obtained are typically in the range 0.2-10 fb for mean proper decay lengths of the long-lived particles in the range 0.01-100 cm. In the case of the lowest Higgs mass considered (125GeV/c2), the limits are in the range 2-50 fb. These limits are sensitive to Higgs boson branching fractions as low as 10-4.
URI: http://journals.aps.org/prd/abstract/10.1103/PhysRevD.91.052012
http://bura.brunel.ac.uk/handle/2438/10795
DOI: http://dx.doi.org/10.1103/PhysRevD.91.052012
ISSN: 1550-7998
1550-2368
Appears in Collections:Dept of Electronic and Computer Engineering Research Papers

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