Search for new physics with long-lived particles decaying to photons and missing energy in pp collisions at sqrt(s) = 7 TeV

S. Chatrchyan; M. Besancon; S. Choudhury; M. Dejardin; D. Denegri; B. Fabbro; J.L. Faure; F. Ferri; S. Ganjour; A. Givernaud; P. Gras; G. Hamel De Monchenault; P. Jarry; E. Locci; J. Malcles; L. Millischer; A. Nayak; J. Rander; A. Rosowsky; I. Shreyber; M. Titov; S. Baffioni; F. Beaudette; L. Benhabib; L. Bianchini; M. Bluj; C. Broutin; Pierre Busson; C. Charlot; N. Daci; T. Dahms; L. Dobrzynski; R. Granier De Cassagnac; M. Haguenauer; P. Mine; C. Mironov; I.N. Naranjo; M. Nguyen; C. Ochando; P. Paganini; D. Sabes; R. Salerno; Y. Sirois; C. Veelken; A. Zabi; J.-L. Agram; J. Andrea; D. Bloch; D. Bodin; J.-M. Brom; M. Cardaci; E.C. Chabert; C. Collard; E. Conte; F. Drouhin; C. Ferro; J.-C. Fontaine; D. Gele; U. Goerlach; P. Juillot; A.-C. Le Bihan; P. Van Hove; F. Fassi; D. Mercier; S. Beauceron; N. Beaupere; O. Bondu; G. Boudoul; J. Chasserat; R. Chierici; D. Contardo; P. Depasse; H. El Mamouni; J. Fay; S. Gascon; M. Gouzevitch; B. Ille; T. Kurca; M. Lethuillier; L. Mirabito; S. Perries; V. Sordini; Y. Tschudi; P. Verdier; S. Viret

doi:10.1007/JHEP11(2012)172

Search for new physics with long-lived particles decaying to photons and missing energy in pp collisions at sqrt(s) = 7 TeV

S. Chatrchyan M. Besancon ¹ S. Choudhury ¹ M. Dejardin ¹ D. Denegri ¹ B. Fabbro ¹ J.L. Faure ¹ F. Ferri ¹ S. Ganjour ¹ A. Givernaud ¹ P. Gras ¹ G. Hamel De Monchenault ¹ P. Jarry ¹ E. Locci ¹ J. Malcles ¹ L. Millischer ¹ A. Nayak ¹ J. Rander ¹ A. Rosowsky ¹ I. Shreyber ¹ M. Titov ¹ S. Baffioni ² F. Beaudette ² L. Benhabib ² L. Bianchini ² M. Bluj ² C. Broutin ² Pierre Busson ² C. Charlot ² N. Daci ² T. Dahms ² L. Dobrzynski ² R. Granier De Cassagnac ² M. Haguenauer ² P. Mine ² C. Mironov ² I.N. Naranjo ² M. Nguyen ² C. Ochando ² P. Paganini ² D. Sabes ² R. Salerno ² Y. Sirois ² C. Veelken ² A. Zabi ² J.-L. Agram ³ J. Andrea ³ D. Bloch ³ D. Bodin ³ J.-M. Brom ³ M. Cardaci ³ E.C. Chabert ³ C. Collard ³ E. Conte ³ F. Drouhin ³ C. Ferro ³ J.-C. Fontaine ³ D. Gele ³ U. Goerlach ³ P. Juillot ³ A.-C. Le Bihan ³ P. Van Hove ³ F. Fassi ⁴ D. Mercier ⁴ S. Beauceron ⁵ N. Beaupere ⁵ O. Bondu ⁵ G. Boudoul ⁵ J. Chasserat ⁵ R. Chierici ⁵ D. Contardo ⁵ P. Depasse ⁵ H. El Mamouni ⁵ J. Fay ⁵ S. Gascon ⁵ M. Gouzevitch ⁵ B. Ille ⁵ T. Kurca ⁵ M. Lethuillier ⁵ L. Mirabito ⁵ S. Perries ⁵ V. Sordini ⁵ Y. Tschudi ⁵ P. Verdier ⁵ S. Viret ⁵

1 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA)

2 LLR - Laboratoire Leprince-Ringuet

3 DRS-IPHC - Département Recherches Subatomiques

4 CC-IN2P3 - Centre de Calcul de l'IN2P3

5 IPNL - Institut de Physique Nucléaire de Lyon

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 inverse femtobarns in pp collisions at sqrt(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 limits vary between 0.11 and 0.21 pb, depending on the neutral particle lifetime.

Document type :

Journal articles

Journal of High Energy Physics, Institute of Physics (IOP), 2012, 11, pp.172. <10.1007/JHEP11(2012)172>

Domain :

Physics / High Energy Physics - Experiment

http://hal.in2p3.fr/in2p3-00714321
Contributor : Sylvie Florès <>
Submitted on : Wednesday, July 4, 2012 - 8:00:39 AM
Last modification on : Friday, March 15, 2013 - 9:53:46 AM

Search for new physics with long-lived particles decaying to photons and missing energy in pp collisions at sqrt(s) = 7 TeV

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