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Search for exclusive or semi-exclusive ? ? production and observation of exclusive and semi-exclusive e+e- production in pp collisions at v s = 7 TeV

Abstract: A search for exclusive or semi-exclusive ?? production, pp ? p(*) + ?? + 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 s?=7s=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 ?? 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 |?| < 2.5, and no other particles in the region |?| < 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(*) + ?? + 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.

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Autoría: Chatrchyan S., Khachatryan V., Sirunyan A.M., Tumasyan A., Adam W., Bergauer T., Dragicevic M., Erö J., Fabjan C., Friedl M., Frühwirth R., Ghete V.M., Hammer J., Hörmann N., Hrubec J., Jeitler M., Kiesenhofer W., Knünz V., Krammer M., Liko D., Mikulec I., Pernicka M., Rahbaran B., Rohringer C., Rohringer H., Schöfbeck R., Strauss J., Taurok A., Wagner P., Waltenberger W., Walzel G., Widl E., Wulz C.E., Mossolov V., Shumeiko N.,

 Fuente: Journal of High Energy Physics 80 (2012)

Editorial: Springer Verlag

 Año de publicación: 2012

Nº de páginas: 35

Tipo de publicación: Artículo de Revista

 DOI: 10.1007/JHEP11(2012)080

ISSN: 1126-6708,1029-8479

Url de la publicación: https://doi.org/10.1007/JHEP11(2012)080

Autores/as

SHANHUEI CHUANG

MARTA FELCINI

CLARA JORDA LOPE

PATRICIA LOBELLE PARDO

MARIA AMPARO LOPEZ VIRTO

RAFAEL JOSE MARCO DE LUCAS

FRANCISCA JAVIELA MUÑOZ SANCHEZ

ANA YAIZA RODRIGUEZ MARRERO

MARIA DEL MAR SOBRON SAÑUDO