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| 題名: | Search for exclusive or semi-exclusive γ γ production and observation of exclusive and semi-exclusive e+e- production in pp collisions at √ s = 7 TeV |
| 作者: | 林宗泰;Chatrchyan, S.;Wagner, P.;Waltenberger, W.;Roland, B.;Blyweert, S.;Clerbaux, B.;Correa Martins, M.;Pol, M. E.;Asawatangtrakuldee, C.;Antunovic, Z.;Morovic, S.;Mousa, J.;Lassila-Perini, K.;Broutin, C.;Kreuzer, P.;Calligaris, L.;Costanza, F.;Geiser, A.;Spiridonov, A.;Hackstein, C.;Rabbertz, K.;Wagner-Kuhr, J.;Kesisoglou, S.;Szillasi, Z.;Dhingra, N.;Sharma, V.;Shukla, P.;Etesami, S. M.;Chhibra, S. S.;Ciulli, V.;Buontempo, S.;Dogangun, O.;Kanishchev, K.;Ratti, S. P.;Saha, A.;Giassi, A.;Monaco, V.;Penzo, A.;Kim, H.;Kim, T. J.;Salazar Ibarguen, H. A.;Khurshid, T.;Romanowska-Rybinska, K.;Karjavin, V.;Gninenko, S.;Vlasov, E.;Ershov, A.;Fouz, M. C.;Gomez, G.;Harris, P.;Meschi, E.;Perez, E.;Horisberger, R.;Rohe, T.;Chanon, N.;Lecomte, P.;Nägeli, C.;Hsiung, Y.;Adiguzel, A.;Gamsizkan, H.;Bostock, F.;Clement, E.;Kreczko, L.;Poll, A.;Della Negra, M.;Nash, J.;Tapper, A.;Virdee, T.;Whyntie, T.;Cole, J. E.;Heister, A.;Chauhan, S.;Farrell, C.;Luthra, A.;Sumowidagdo, S.;Kalavase, P.;Mott, A.;Jang, D. W.;Mirman, N.;Chetluru, V.;Newman-Holmes, C.;Prokofyev, O.;Gartner, J.;Varelas, N.;Griffiths, S.;Swartz, M.;Avdeeva, E.;Kravchenko, I.;Trocino, D.;Kotov, K.;Lopes Pegna, D.;Ecklund, K. M.;Chung, Y. S.;Patel, R.;Schnetzer, S.;Khotilovich, V.;Appelt, E.;Lin, C.;Belknap, D.;Dasu, S. |
| 貢獻者: | 理學院物理學系 |
| 日期: | 2012-01-01 |
| 上傳時間: | 2026-04-23 13:08:35 (UTC+8) |
| 出版者: | United States: Springer Berlin |
| 摘要: | 摘要： A search for exclusive or semi-exclusive γγ production, pp → p (*) + γγ + p (*) (where p * stands for a diffractively-dissociated proton), and the observation of exclusive and semi-exclusive e + e − production, pp → p (*) + e + e − + p (*) , in proton-proton collisions at$ \sqrt{s}=7 $TeV, are presented. The analysis is based on a data sample corresponding to an integrated luminosity of 36 pb −1 recorded by the CMS experiment at the LHC at low instantaneous luminosities. Candidate γγ or e + e − events are selected by requiring the presence of two photons or a positron and an electron, each with transverse energy E T > 5 . 5 GeV and pseudorapidity | η | < 2 . 5, and no other particles in the region | η | < 5 . 2. No exclusive or semi-exclusive diphoton candidates are found in the data. An upper limit on the cross section for the reaction pp → p (*) + γγ + p (*) , within the above kinematic selections, is set at 1.18 pb at 95% confidence level. Seventeen exclusive or semi-exclusive dielectron candidates are observed, with an estimated background of 0 . 85 ± 0 . 28 (stat.) events, in agreement with the QED-based prediction of 16 . 3 ± 1 . 3 (syst.) events.
出版者： United States: Springer Berlin
出版日期： 2012-11-15
出處： Journal of High Energy Physics (Online), 2012-11, Vol.2012 (11), Article 80
資源來源： ProQuest Open Access Content Collection
識別號： ISSN: 1029-8479
識別號： ISSN: 1126-6708
識別號： ISSN: 1127-2236
識別號： EISSN: 1029-8479
識別號： DOI: 10.1007/JHEP11(2012)080 |
| 顯示於類別: | [物理學系] 期刊論文
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