Signature-based search for delayed photons in exclusive photon plus missing transverse energy events from pp̄ collisions with √s=1.96 TeV

T. Aaltonen, S. Amerio, D. Amidei, A. Anastassov, A. Annovi,J. Antos, G. Apollinari,J. A. Appel,T. Arisawa, A. Artikov,J. Asaadi, W. Ashmanskas,B. Auerbach,A. Aurisano,F. Azfar,W. Badgett, T. Bae, A. Barbaro-Galtieri,V. E. Barnes, B. A. Barnett,P. Barria, P. Bartos,M. Bauce,F. Bedeschi, S. Behari, G. Bellettini, J. Bellinger, D. Benjamin,A. Beretvas,A. Bhatti,K. R. Bland, B. Blumenfeld,A. Bocci,A. Bodek,D. Bortoletto, J. Boudreau,A. Boveia,L. Brigliadori, C. Bromberg,E. Brucken, J. Budagov,H. S. Budd, K. Burkett, G. Busetto, P. Bussey,P. Butti,A. Buzatu, A. Calamba,S. Camarda, M. Campanelli,F. Canelli, B. Carls, D. Carlsmith, R. Carosi,S. Carrillo, B. Casal,M. Casarsa,A. Castro, P. Catastini,D. Cauz,V. Cavaliere,M. Cavalli-Sforza,A. Cerri,L. Cerrito, Y. C. Chen,M. Chertok,G. Chiarelli, G. Chlachidze,K. Cho,D. Chokheli,M. A. Ciocci,A. Clark,C. Clarke,M. E. Convery,J. Conway,M. Corbo,M. Cordelli,C. A. Cox,D. J. Cox,M. Cremonesi,D. Cruz,J. Cuevas, R. Culbertson,N. D’Ascenzo,M. Datta,P. De Barbaro, L. Demortier,M. Deninno,M. D’Errico,F. Devoto,A. Di Canto,B. Di Ruzza,J. R. Dittmann,M. D’Onofrio,S. Donati,M. Dorigo,A. Driutti, K. Ebina,R. Edgar, A. Elagin,R. Erbacher, S. Errede, B. Esham,R. Eusebi,S. Farrington,J. P. Fernández Ramos, R. Field,G. Flanagan,R. Forrest,M. Franklin,J. C. Freeman,H. Frisch,Y. Funakoshi,A. F. Garfinkel,P. Garosi, H. Gerberich, E. Gerchtein,S. Giagu, V. Giakoumopoulou,K. Gibson,C. M. Ginsburg, N. Giokaris,P. Giromini, G. Giurgiu,V. Glagolev, D. Glenzinski,M. Gold, D. Goldin, A. Golossanov, G. Gomez,G. Gomez-Ceballos,M. Goncharov,O. González López,I. Gorelov,A. T. Goshaw, K. Goulianos, E. Gramellini,S. Grinstein, C. Grosso-Pilcher,J. Guimaraes da Costa, S. R. Hahn, J. Y. Han, F. Happacher, K. Hara,M. Hare,R. F. Harr,T. Harrington-Taber, K. Hatakeyama,C. Hays,J. Heinrich,M. Herndon, A. Hocker,Z. Hong,W. Hopkins,S. Hou,R. E. Hughes, U. Husemann,M. Hussein, J. Huston,G. Introzzi,M. Iori,A. Ivanov,E. James,D. Jang, B. Jayatilaka,E. J. Jeon,S. Jindariani,M. Jones, K. K. Joo,S. Y. Jun,T. R. Junk,M. Kambeitz, T. Kamon,P. E. Karchin, A. Kasmi,Y. Kato,W. Ketchum,J. Keung,B. Kilminster,D. H. Kim,H. S. Kim,J. E. Kim,M. J. Kim,S. B. Kim,S. H. Kim,Y. J. Kim,Y. K. Kim, N. Kimura, M. Kirby, K. Knoepfel,K. Kondo,D. J. Kong, J. Konigsberg,A. V. Kotwal, M. Kreps,J. Kroll,M. Kruse, T. Kuhr, M. Kurata,A. T. Laasanen,S. Lammel,M. Lancaster,K. Lannon,G. Latino,H. S. Lee,J. S. Lee,S. Leo, S. Leone,J. D. Lewis, A. Limosani,E. Lipeles,A. Lister,H. Liu,Q. Liu,T. Liu, S. Lockwitz,A. Loginov,A. Lucà,D. Lucchesi, J. Lueck, P. Lujan,P. Lukens, G. Lungu, J. Lys,R. Lysak, R. Madrak,P. Maestro, S. Malik,G. Manca,A. Manousakis-Katsikakis,F. Margaroli,P. Marino,M. Martínez,K. Matera,M. E. Mattson,A. Mazzacane, P. Mazzanti,R. Mcnulty,A. Mehta, P. Mehtala,C. Mesropian,T. Miao,D. Mietlicki,A. Mitra,H. Miyake, S. Moed, N. Moggi,C. S. Moon,R. Moore,M. J. Morello,A. Mukherjee,Th. Muller, P. Murat, M. Mussini, J. Nachtman,Y. Nagai, J. Naganoma, I. Nakano, A. Napier, J. Nett, C. Neu,T. Nigmanov, L. Nodulman,S. Y. Noh, O. Norniella, L. Oakes, S. H. Oh, Y. D. Oh, I. Oksuzian, T. Okusawa, R. Orava, L. Ortolan, C. Pagliarone,E. Palencia,P. Palni,V. Papadimitriou,W. Parker,G. Pauletta,M. Paulini,C. Paus,T. J. Phillips,G. Piacentino,E. Pianori, J. Pilot,K. Pitts, C. Plager, L. Pondrom,S. Poprocki,K. Potamianos, A. Pranko,F. Prokoshin,F. Ptohos,G. Punzi, N. Ranjan,I. Redondo Fernández, P. Renton, M. Rescigno, F. Rimondi, L. Ristori,A. Robson,T. Rodriguez, S. Rolli,M. Ronzani, R. Roser, J. L. Rosner,F. Ruffini,A. Ruiz,J. Russ,V. Rusu,W. K. Sakumoto,Y. Sakurai, L. Santi,K. Sato,V. Saveliev, A. Savoy-Navarro, P. Schlabach, E. E. Schmidt, T. Schwarz,L. Scodellaro, F. Scuri, S. Seidel, Y. Seiya,A. Semenov,F. Sforza,S. Z. Shalhout,T. Shears,P. F. Shepard, M. Shimojima, M. Shochet, I. Shreyber-Tecker,A. Simonenko,P. Sinervo,K. Sliwa,J. R. Smith,F. D. Snider,H. Song,V. Sorin, M. Stancari,R. St. Denis St Denis,B. Stelzer,O. Stelzer-Chilton, D. Stentz,J. Strologas,Y. Sudo, A. Sukhanov, I. Suslov, K. Takemasa,Y. Takeuchi,J. Tang, M. Tecchio,P. K. Teng,J. Thom,E. Thomson,V. Thukral,D. Toback, S. Tokar, K. Tollefson,T. Tomura,D. Tonelli,S. Torre, D. Torretta, P. Totaro, M. Trovato,F. Ukegawa, S. Uozumi,F. Vázquez, G. Velev, C. Vellidis,C. Vernieri,M. Vidal,R. Vilar,J. Vizán,M. Vogel, G. Volpi,P. Wagner,R. Wallny,S. M. Wang,A. Warburton, D. Waters,W. C. Wester, D. Whiteson,A. B. Wicklund,S. Wilbur,H. H. Williams,J. S. Wilson,P. Wilson,B. L. Winer,P. Wittich,S. Wolbers,H. Wolfe,T. Wright,X. Wu,Z. Wu,K. Yamamoto,D. Yamato,T. Yang,U. K. Yang,Y. C. Yang, W.-M. Yao,G. P. Yeh,K. Yi,J. Yoh,K. Yorita,T. Yoshida, G. B. Yu,I. Yu, A. M. Zanetti,Y. Zeng,C. Zhou,S. Zucchelli

user-5f8411ab4c775e9685ff56d3（2013）

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摘要

We present the first signature-based search for delayed photons using an exclusive photon plus missing transverse energy final state. Events are reconstructed in a data sample from the CDF II detector corresponding to 6.3fb−1 of integrated luminosity from s√=1.96 TeV proton-antiproton collisions. Candidate events are selected if they contain a photon with an arrival time in the detector larger than expected from a promptly-produced photon. The mean number of events from standard model sources predicted by the data-driven background model based on the photon timing distribution is 286±24. A total of 322 events are observed. A p-value of 12% is obtained, showing consistency of the data with standard model predictions.

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关键词

Luminosity (scattering theory),Photon,Standard Model,Detector,Supersymmetry,Particle physics,Nuclear physics,Transverse plane,Energy (signal processing),Consistency (statistics),Physics

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