A Search for Single Photon Events in Neutrino Interactions

Kullenberg, C.T.; Kovzelev, A.; Méchain, X.; Levy, J.M.; Seaton, M.B.; Weber, F.V.; Stiegler, U.; Marchionni, A.; Kokkonen, J.; Weisse, T.; Winton, L.J.; Vercesi, V.; Long, J.; Lakić, B.; Hurst, P.; Zuccon, P.; Bobisut, F.; Nédélec, P.; Steele, D.; Mezzetto, M.; Contalbrigo, M.; Stipčević, M.; Polesello, G.; Di Lella, L.; Touchard, A.-M.; Graziani, G.; Gomez-Cadenas, J.-J.; Juget, F.; Sconza, A.; Laveder, M.; Naumov, D.; Meyer, J.-P.; Ljubičic, A.; Gößling, C.; Klimov, O.; Schmidt, B.; Valuev, V.; Pollmann, D.; Wilson, F.F.; Salvatore, F.; Alekhin, S.; Polyarush, A.; Ferrère, D.; Gangler, E.; Schmidt, T.; Veltri, M.; Bird, I.; Conforto, G.; Gninenko, S.; Pastore, F.; Tran, M.-T.; Kent, N.; Cervera-Villanueva, A.; Blumenfeld, B.; Geppert, D.; Hernando, J.; Poulsen, C.; Feldman, G.J.; Lyubushkin, V.; Dimmery, D.; Placci, A.; Degaudenzi, H.; Besson, N.; Kirsanov, M.; Iacopini, E.; Astier, P.; Pennacchio, E.; Cavasinni, V.; Vacavant, L.; Krasnoperov, A.; Kim, J.J.; Taylor, G.N.; Bunyatov, S.; Tareb-Reyes, M.; Gaillard, J.-M.; Cousins, R.; Conta, C.; Gosset, J.; Hagner, C.; Bouchez, J.; Toropin, A.; Bassompierre, G.; Cattaneo, P.W.; Sozzi, G.; Gibin, D.; Rebuffi, L.; Tian, X.C.; Zuber, K.; Kulagin, S.; Gouanère, M.; Martelli, F.; Vieira, J.-M.; Boyd, S.; De Santo, A.; Valdata-Nappi, M.; Tereshchenko, V.; Zaccone, H.; Baldisseri, A.; Sillou, D.; Del Prete, T.; Lupi, A.; Stolarczyk, Th.; Ferrari, R.; Flaminio, V.; Baldo-Ceolin, M.; Letessier-Selvon, A.; Collazuol, G.; Petti, R.; Bueno, A.; Ulrichs, J.; Autiero, D.; Peak, L.S.; Pessard, H.; Nguyen-Mau, C.; Joseph, C.; Wu, Q.; Benslama, K.; Vannucci, F.; Varvell, K.E.; Challis, R.; Cardini, A.; Fraternali, M.; Chukanov, A.; Rubbia, A.; Tsesmelis, E.; Lacaprara, S.; Popov, B.; Samoylov, O.; Rico, J.; Hyett, N.; Nefedov, Yu.; Roda, C.; Tovey, S.N.; Lanza, A.; do Couto e Silva, E.; Ellis, M.; Riemann, P.; Godley, A.; Linssen, L.; Camilleri, L.; La Rotonda, L.; Mishra, S.R.; Yabsley, B.D.; Schahmaneche, K.; Banner, M.; Geiser, A.; Guglielmi, A.; Lachaud, C.; Vidal-Sitjes, G.; Ling, J.; Dumarchez, J.; Sevior, M.; Moorhead, G.F.; Grant, A.; Mendiburu, J.-P.; Orestano, D.; Soler, F.J.P.; Scott, A.M.; Vinogradova, T.

doi:10.1016/j.physletb.2011.11.049

Article
Report number	arXiv:1111.3713
Title	A Search for Single Photon Events in Neutrino Interactions
Author(s)	Kullenberg, C.T. (South Carolina U.) ; Mishra, S.R. (South Carolina U.) ; Dimmery, D. (South Carolina U.) ; Tian, X.C. (South Carolina U.) ; Autiero, D. (CERN) ; Gninenko, S. (CERN ; Moscow, INR) ; Rubbia, A. (CERN ; Zurich, ETH) ; Alekhin, S. (Serpukhov, IHEP) ; Astier, P. (Paris U., VI-VII) ; Baldisseri, A. (DAPNIA, Saclay) ; Baldo-Ceolin, M. (Padua U. ; INFN, Padua) ; Banner, M. (Paris U., VI-VII) ; Bassompierre, G. (Annecy, LAPP) ; Benslama, K. (Lausanne U.) ; Besson, N. (DAPNIA, Saclay) ; Bird, I. (CERN ; Lausanne U.) ; Blumenfeld, B. (Johns Hopkins U.) ; Bobisut, F. (Padua U. ; INFN, Padua) ; Bouchez, J. (DAPNIA, Saclay) ; Boyd, S. (Sydney U.) ; Bueno, A. (Harvard U. ; Zurich, ETH) ; Bunyatov, S. (Dubna, JINR) ; Camilleri, L. (CERN) ; Cardini, A. (UCLA) ; Cattaneo, P.W. (Pavia U. ; INFN, Pavia) ; Cavasinni, V. (Pisa U. ; INFN, Pisa) ; Cervera-Villanueva, A. (CERN ; Valencia U., IFIC) ; Challis, R. (Melbourne U.) ; Chukanov, A. (Dubna, JINR) ; Collazuol, G. (Padua U. ; INFN, Padua) ; Conforto, G. (CERN ; Urbino U.) ; Conta, C. (Pavia U. ; INFN, Pavia) ; Contalbrigo, M. (Padua U. ; INFN, Padua) ; Cousins, R. (UCLA) ; Degaudenzi, H. (Lausanne U.) ; De Santo, A. (CERN ; Pisa U. ; INFN, Pisa) ; Del Prete, T. (Pisa U. ; INFN, Pisa) ; Di Lella, L. (CERN) ; do Couto e Silva, E. (CERN) ; Dumarchez, J. (Paris U., VI-VII) ; Ellis, M. (Sydney U.) ; Feldman, G.J. (Harvard U.) ; Ferrari, R. (Pavia U. ; INFN, Pavia) ; Ferrère, D. (CERN) ; Flaminio, V. (Pisa U. ; INFN, Pisa) ; Fraternali, M. (Pavia U. ; INFN, Pavia) ; Gaillard, J.-M. (Annecy, LAPP) ; Gangler, E. (CERN ; Paris U., VI-VII) ; Geiser, A. (Tech. U., Dortmund (main) ; CERN) ; Geppert, D. (Tech. U., Dortmund (main)) ; Gibin, D. (Padua U. ; INFN, Padua) ; Godley, A. (South Carolina U.) ; Gomez-Cadenas, J.-J. (CERN ; Valencia U., IFIC) ; Gosset, J. (DAPNIA, Saclay) ; Gößling, C. (Tech. U., Dortmund (main)) ; Gouanère, M. (Annecy, LAPP) ; Grant, A. (CERN) ; Graziani, G. (Florence U.) ; Guglielmi, A. (Padua U. ; INFN, Padua) ; Hagner, C. (DAPNIA, Saclay) ; Hernando, J. (Valencia U., IFIC) ; Hurst, P. (Harvard U.) ; Hyett, N. (Melbourne U.) ; Iacopini, E. (Florence U.) ; Joseph, C. (Lausanne U.) ; Juget, F. (Lausanne U.) ; Kent, N. (Melbourne U.) ; Klimov, O. (Dubna, JINR) ; Kokkonen, J. (CERN) ; Kovzelev, A. (Moscow, INR ; Pavia U. ; INFN, Pavia) ; Krasnoperov, A. (Annecy, LAPP ; Dubna, JINR) ; Kim, J.J. (South Carolina U.) ; Kirsanov, M. (Moscow, INR) ; Kulagin, S. (Moscow, INR) ; Lacaprara, S. (Padua U. ; INFN, Padua) ; Lachaud, C. (Paris U., VI-VII) ; Lakić, B. (Boskovic Inst., Zagreb) ; Lanza, A. (Pavia U. ; INFN, Pavia) ; La Rotonda, L. (Calabria U.) ; Laveder, M. (Padua U. ; INFN, Padua) ; Letessier-Selvon, A. (Paris U., VI-VII) ; Levy, J.M. (Paris U., VI-VII) ; Ling, J. (South Carolina U.) ; Linssen, L. (CERN) ; Ljubičic, A. (Boskovic Inst., Zagreb) ; Long, J. (Johns Hopkins U.) ; Lupi, A. (Florence U.) ; Lyubushkin, V. (Dubna, JINR) ; Marchionni, A. (Florence U.) ; Martelli, F. (Urbino U.) ; Méchain, X. (DAPNIA, Saclay) ; Mendiburu, J.-P. (Annecy, LAPP) ; Meyer, J.-P. (DAPNIA, Saclay) ; Mezzetto, M. (Padua U. ; INFN, Padua) ; Moorhead, G.F. (Melbourne U.) ; Naumov, D. (Dubna, JINR) ; Nédélec, P. (Annecy, LAPP) ; Nefedov, Yu. (Dubna, JINR) ; Nguyen-Mau, C. (Lausanne U.) ; Orestano, D. (Rome III U. ; INFN, Rome) ; Pastore, F. (Rome III U. ; INFN, Rome) ; Peak, L.S. (Sydney U.) ; Pennacchio, E. (Urbino U.) ; Pessard, H. (Annecy, LAPP) ; Petti, R. (South Carolina U.) ; Placci, A. (CERN) ; Polesello, G. (Pavia U. ; INFN, Pavia) ; Pollmann, D. (Tech. U., Dortmund (main)) ; Polyarush, A. (Moscow, INR) ; Poulsen, C. (Melbourne U.) ; Popov, B. (Dubna, JINR ; Paris U., VI-VII) ; Rebuffi, L. (Padua U. ; INFN, Padua) ; Rico, J. (Zurich, ETH) ; Riemann, P. (Tech. U., Dortmund (main)) ; Roda, C. (CERN ; Pisa U. ; INFN, Pisa) ; Salvatore, F. (Pavia U. ; INFN, Pavia) ; Samoylov, O. (Dubna, JINR) ; Schahmaneche, K. (Paris U., VI-VII) ; Schmidt, B. (Tech. U., Dortmund (main) ; CERN) ; Schmidt, T. (Tech. U., Dortmund (main)) ; Sconza, A. (Padua U. ; INFN, Padua) ; Scott, A.M. (South Carolina U.) ; Seaton, M.B. (South Carolina U.) ; Sevior, M. (Melbourne U.) ; Sillou, D. (Annecy, LAPP) ; Soler, F.J.P. (CERN ; Sydney U.) ; Sozzi, G. (Lausanne U.) ; Steele, D. (Johns Hopkins U. ; Lausanne U.) ; Stiegler, U. (CERN) ; Stipčević, M. (Boskovic Inst., Zagreb) ; Stolarczyk, Th. (DAPNIA, Saclay) ; Tareb-Reyes, M. (Lausanne U.) ; Taylor, G.N. (Melbourne U.) ; Tereshchenko, V. (Dubna, JINR) ; Toropin, A. (Moscow, INR) ; Touchard, A.-M. (Paris U., VI-VII) ; Tovey, S.N. (CERN ; Melbourne U.) ; Tran, M.-T. (Lausanne U.) ; Tsesmelis, E. (CERN) ; Ulrichs, J. (Sydney U.) ; Vacavant, L. (Lausanne U.) ; Valdata-Nappi, M. (Calabria U.) ; Valuev, V. (Dubna, JINR ; UCLA) ; Vannucci, F. (Paris U., VI-VII) ; Varvell, K.E. (Sydney U.) ; Veltri, M. (Urbino U.) ; Vercesi, V. (Pavia U. ; INFN, Pavia) ; Vidal-Sitjes, G. (CERN) ; Vieira, J.-M. (Lausanne U.) ; Vinogradova, T. (UCLA) ; Weber, F.V. (Harvard U. ; CERN) ; Weisse, T. (Tech. U., Dortmund (main)) ; Wilson, F.F. (CERN) ; Winton, L.J. (Melbourne U.) ; Wu, Q. (South Carolina U.) ; Yabsley, B.D. (Sydney U.) ; Zaccone, H. (DAPNIA, Saclay) ; Zuber, K. (Tech. U., Dortmund (main)) ; Zuccon, P. (Padua U. ; INFN, Padua) NOMAD Collaboration Visualizza tutti i 159 autori
Publication	2012-01-05
Imprint	17 Nov 2011
Number of pages	8
In:	Phys. Lett. B 706 (2012) 268-275
DOI	10.1016/j.physletb.2011.11.049
Subject category	Particle Physics - Experiment
Accelerator/Facility, Experiment	CERN SPS ; NOMAD WA96
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 $\simeq 25$ 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 {\it in situ} using control data samples prior to opening the `signal-box'. In the signal region, we observe {\bf 155} events with a predicted background of {\bf 129.2 $\pm$ 8.5 $\pm$ 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, {\boldmath $< 4.0 \times 10^{-4}$ } per \nm\ charged current event. Narrowing the search to events where the photon is approximately collinear with the incident neutrino, we observe {\bf 78} events with a predicted background of {\bf 76.6 $\pm$ 4.9 $\pm$ 1.9} yielding a more stringent upper limit, {\boldmath $< 1.6 \times 10^{-4}$ } per \nm\ charged current event.
Copyright/License	Elsevier B.V. (License: arXiv nonexclusive-distrib. 1.0)

$Schematic of the DC tracker with a single $\gamma$-conversion event in NOMAD in Y (vertical) vs Z (horizontal) view. The energy and angle with respect to the neutrino direction of the \gam\ are 3.1~GeV and 0.095~Radians.$ $noimg: Preselection of events with a single, converted \gam\ in \cohp, NC-Resonance, and NC-DIS MC samples, and data. The MC samples, having a much larger statistics than data, are normalized to the expectation as described in the text. The ${\rm { |(X,Y-5)|_{PROJ} }}$ refer to X- and Y-position of the \gam-vector when projected to the most upstream DC (${\rm { Z_{Min} }}$).: Final selection of single $\gamma$ Events in the MC Samples: The MC samples have been normalized as presented in Section~\ref{sec-sel}.: Events passing and failing the Z-cut in \tgam\ samples in Data and OBG-Data$ $Comparison of \pan, the energy asymmetry between the \sgam-momentum and the neutral energy in the ECAL, between Data (Symbol) and prediction: \cohp\ (Blue-hatched), OBG (Green-dash-dot), NC-DIS (Red-dash), and total (Black-histogram). The signal region, \pan $\geq 0.9$, is not looked at till the analysis is complete.$ Show more plots

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