Please use this identifier to cite or link to this item: http://buratest.brunel.ac.uk/handle/2438/7310
Title: Search for new physics with long-lived particles decaying to photons and missing energy in pp collisions at √s=7 TeV
Authors: Chatrchyan, S
Khachatryan, V
Sirunyan, AM
Tumasyan, A
Adam, W
Aguilo, E
Bergauer, T
Dragicevic, M
Ero, J
Fabjan, C
Friedl, M
Akgun, B
Fanelli, C
Ron, E
Nappi, A
Dabrowski, A
Rosin, M
Salfeld-Nebgen, J
Sudhakar, K
Schmidt, R
Schoerner-Sadenius, T
Marcellini, S
Azzolini, V
Schmitt, M
Lazo-Flores, J
Mason, D
Cherepanov, V
Weber, H
Florez, C
Cabrillo, IJ
Le Bihan, AC
Tourtchanovitch, L
Roland, B
Toback, D
Sen, N
Smith, J
Spiridonov, A
Marone, M
Stein, M
Wright, D
Walsh, R
Nash, D
Wissing, C
Karchin, PE
Behrenhoff, W
Munoz Sanchez, FJ
Stoye, M
Ille, B
Belyaev, A
Van Hove, P
De Roeck, A
Cox, PT
Baden, A
Autermann, C
Leonardo, N
Calamba, A
Blobel, V
Malbouisson, H
Pashenkov, A
Lee, YJ
Draeger, J
Lawson, P
Enderle, H
Hanson, G
Montanino, D
Teodorescu, L
Nguyen, D
Wickramage, N
Stoeckli, F
Erfle, J
Rougny, R
Antunes, JR
Dolen, J
Pierini, M
Gebbert, U
Goerner, M
Greene, S
Carroll, R
Hermanns, T
Zarubin, A
McBride, P
Girgis, S
Hoeing, RS
Choi, M
Di Guida, S
Kaschube, K
Fassi, F
Bisello, D
Zabel, J
Malik, S
Banerjee, S
Kaussen, G
Boutemeur, M
Gurrola, A
Rogerson, S
Polic, D
Erbacher, R
Penzo, A
Kyriakis, A
Adams, T
Kirschenmann, H
Klanner, R
Gokieli, R
Ozpineci, A
Lange, J
Schael, S
Mura, B
Kim, JH
Kumar, V
Mishra, K
Castaldi, R
Hou, W-S
Selvaggi, M
Nowak, F
Peiffer, T
Dugad, S
Gokbulut, G
Tlisov, D
Soares, MS
Park, C
Gardner, M
Focardi, E
Ofierzynski, RA
Pietsch, N
Dobson, M
Snow, GR
Marinov, A
Johns, W
Mercier, D
Rathjens, D
Sander, C
Schettler, H
Erdogan, Y
Sammet, J
Mehta, MZ
Toropin, A
Mrenna, S
Starodumov, A
Sellers, P
Schleper, P
Schlieckau, E
Tenchini, R
Johnston, C
Meschi, E
Ferguson, T
Masetti, G
Park, IC
Schmidt, A
Calvert, B
Schroeder, M
Furic, IK
Beauceron, S
Staykova, Z
Schum, T
Seidel, M
Iiyama, Y
Dremin, I
Lynch, S
De Benedetti, A
Sanabria, JC
Ranjan, K
Mahmoud, MA
Dupont-Sagorin, N
Lomtadze, T
Edelhoff, M
D'Hondt, J
Jang, DW
Sola, V
Arfaei, H
Beaupere, N
Park, S
Stadie, H
Steinbrueck, G
Gurpinar, E
Eno, SC
Thomsen, J
Pereira, AV
Vodopiyanov, I
Vanelderen, L
Epshteyn, V
Barth, C
Berger, J
Ryu, G
Boeser, C
Schizzi, A
Mantovani, G
Van Haevermaet, H
Gomez, JA
Olschewski, M
Johnson, M
Newman-Holmes, C
Hos, I
Kurt, P
Chang, S
Ryckbosch, D
Bakhshiansohi, H
Merkel, P
Etesami, SM
Gowdy, S
Loveless, R
Fahim, A
Winstrom, L
Van Onsem, GP
Hashemi, M
Lloret Iglesias, L
Acosta, JG
Wang, J
Bondu, O
Elgammal, S
De La Cruz, B
Basegmez, S
Kangal, EE
Hesari, H
Jafari, A
Bansal, S
Heo, SG
Song, S
Khakzad, M
Ling, TY
Cerrada, M
Uplegger, L
Betchart, B
Najafabadi, MM
Erofeeva, M
Mehdiabadi, SP
Maguire, C
Safarzadeh, B
Gamsizkan, H
Wittmer, B
Boudoul, G
Mueller, S
Houtz, R
Bylsma, B
Raics, P
Zeinali, M
Guida, R
Abbrescia, M
Hartmann, F
Ignatenko, M
Barbone, L
Trocino, D
Hadley, NJ
Malgeri, L
Ata, M
Kirn, M
Villella, I
Choi, S
Hunt, A
Pozdnyakov, A
Chasserat, J
Calabria, C
Hrubec, J
Orsini, L
Gavrilov, V
Geurts, FJM
Willmott, C
Perera, L
Chhibra, SS
Colaleo, A
Creanza, D
Melo, A
De Filippis, N
Hauth, T
De Palma, M
Karaman, T
Fiore, L
Liu, YF
Dubinin, M
Gorski, M
Volpe, R
Kellogg, RG
Kossov, M
Lannon, K
Hansen, M
Wood, D
Iaydjiev, P
Ryutin, R
Pavlov, B
Hildreth, M
Gyun, D
Iaselli, G
Squires, M
Lusito, L
Singh, AP
Saha, A
Serin, M
Maggi, G
Godshalk, A
Battilana, C
Clerbaux, B
Brigljevic, V
Maggi, M
Gonzalez Caballero, I
Cho, Y
Marangelli, B
My, S
Turner, M
Ko, W
Nuzzo, S
De Mattia, M
Lychkovskaya, N
Pacifico, N
Karapinar, G
Vaandering, EW
Pompili, A
Choi, Y
Dudko, L
Morse, DM
Finger, M
Pedrini, D
Tupputi, S
Kroeger, R
Heinrich, M
Zhang, J
Popov, V
Harris, P
Pugliese, G
Shivpuri, RK
Safdi, B
Stieger, B
Ronchese, P
Chadwick, M
Kopecky, A
Radi, A
Selvaggi, G
Brun, H
Silvestris, L
Singh, G
Kotov, K
Karavakis, E
De Lentdecker, G
Benitez, JF
Paulini, M
Vidal, R
Venditti, R
Zito, G
Grassi, M
Van Mechelen, P
Kim, DH
Abbiendi, G
Sharma, M
Mozer, MU
Hong, B
Ribnik, J
Vogel, H
Safronov, G
Lander, R
Benvenuti, AC
Anastassov, A
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Teng, H
Van Doninck, W
Hartl, C
Braibant-Giacomelli, S
Choi, YK
Vorobiev, I
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Topaksu, AK
Sheldon, P
Feld, L
Whitmore, J
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Frisch, B
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Farrell, C
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Bergholz, M
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CMS Collaboration
Keywords: Hadron-Hadron Scattering
Issue Date: 2012
Publisher: Springer-Verlag
Citation: Journal of High Energy Physics (11): 172, Nov 2012
Abstract: A search is performed for long-lived neutral particles decaying into a photon and invisible particles. An example of such a signature is the decay of the lightest neutralino with nonzero lifetime into a gravitino and a photon in gauge-mediated supersymmetry, with the neutralino as the next-to-lightest supersymmetric particle and the gravitino as the lightest. The search uses events containing photons, missing transverse energy, and jets. The impact parameter of the photon relative to the beam-beam collision point can be reconstructed using converted photons. The method is sensitive to lifetimes of the order of 0.1 to 1 ns. The data sample corresponds to an integrated luminosity of 2.23 fb−1 in pp collisions at √s=7 TeV, recorded in the first part of 2011 by the CMS experiment at the LHC. Cross-section limits are presented on pair production for such particles, each of which decays into a photon and invisible particles. The observed 95% confidence level limitsvary between 0.11 and 0.21 pb, depending on the neutral particle lifetime.
Description: This is the pre-print version of the Article. The official published version can be accessed from the link below - Copyright @ 2012 Springer-Verlag
URI: http://link.springer.com/article/10.1007%2FJHEP11%282012%29172
http://bura.brunel.ac.uk/handle/2438/7310
DOI: http://dx.doi.org/10.1007/JHEP11(2012)172
ISSN: 1029-8479
Appears in Collections:Electronic and Computer Engineering
Dept of Electronic and Computer Engineering Research Papers

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