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A search for single photon events in neutrino interactions

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A search for single photon events in neutrino interactions

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dc.contributor.author	NOMAD Collaboration
dc.contributor.author	Kullenberg, C. T.
dc.contributor.author	Cervera Villanueva, Anselmo
dc.contributor.author	Hernando Morata, José Ángel
dc.contributor.author	Gómez Cadenas, Juan José
dc.date.accessioned	2015-12-21T08:16:08Z
dc.date.available	2015-12-21T08:16:08Z
dc.date.issued	2012
dc.identifier.citation	NOMAD Collaboration Kullenberg, C. T. Cervera Villanueva, Anselmo Hernando Morata, José Ángel 2012 A search for single photon events in neutrino interactions Physics Letters B 706 4-5 268 275
dc.identifier.uri	http://hdl.handle.net/10550/49629
dc.description.abstract	We present a search for neutrino induced events containing a single, exclusive photon using data from the NOMAD experiment at the CERN SPS where the average energy of the neutrino flux is similar or equal to 25 GeV. The search is motivated by an excess of electron-like events in the 200-475 MeV energy region as reported by the MiniBooNE experiment. In NOMAD, photons are identified via their conversion to e(+)e(-) in an active target embedded in a magnetic field. The background to the single photon signal is dominated by the asymmetric decay of neutral pions produced either in a coherent neutrino-nucleus interaction, or in a neutrino-nucleon neutral current deep inelastic scattering, or in an interaction occurring outside the fiducial volume. All three backgrounds are determined in situ using control data samples prior to opening the 'signal-box'. In the signal region, we observe 155 events with a predicted background of 129.2 +/- 8.5 +/- 3.3. We interpret this as null evidence for excess of single photon events, and set a limit. Assuming that the hypothetical single photon has a momentum distribution similar to that of a photon from the coherent pi(0) decay, the measurement yields an upper limit on single photon events, < 4.0 x 10(-4) per nu(mu) charged current event. Narrowing the search to events where the photon is approximately collinear with the incident neutrino, we observe 78 events with a predicted background of 76.6 +/- 4.9 +/- 1.9 yielding a more stringent upper limit, < 1.6 x 10(-4) per nu(mu) charged current event.
dc.language.iso	eng
dc.relation.ispartof	Physics Letters B, 2012, vol. 706, num. 4-5, p. 268-275
dc.subject	Física
dc.title	A search for single photon events in neutrino interactions
dc.type	journal article	es_ES
dc.date.updated	2015-12-21T08:16:09Z
dc.identifier.doi	10.1016/j.physletb.2011.11.049
dc.identifier.idgrec	080383
dc.rights.accessRights	open access	es_ES