A search for single photon events in neutrino interactions

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

doi:10.1016/j.physletb.2011.11.049

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. © 2011 Elsevier B.V. All rights reserved. Open access under CC BY license

A search for single photon events in neutrino interactions / Kullenberg, C. T.; Mishra, S. R.; Dimmery, D.; Tian, X. C.; Autiero, D.; Gninenko, S.; Rubbia, A.; Alekhin, S.; Astier, P.; Baldisseri, A.; Baldo-Ceolin, M.; Banner, M.; Bassompierre, G.; Benslama, K.; Besson, N.; Bird, I.; Blumenfeld, B.; Bobisut, F.; Bouchez, J.; Boyd, S.; Bueno, A.; Bunyatov, S.; Camilleri, L.; Cardini, A.; Cattaneo, P. W.; Cavasinni, V.; Cervera-Villanueva, A.; Challis, R.; Chukanov, A.; Collazuol, G.; Conforto, G.; Conta, C.; Contalbrigo, M.; Cousins, R.; Degaudenzi, H.; De Santo, A.; Del Prete, T.; Di Lella, L.; do Couto e Silva, E.; Dumarchez, J.; Ellis, M.; Feldman, G. J.; Ferrari, R.; Ferrãre, D.; Flaminio, V.; Fraternali, M.; Gaillard, J. -M.; Gangler, E.; Geiser, A.; Geppert, D.; Gibin, D.; Godley, A.; Gomez-Cadenas, J. -J.; Gosset, J.; Gã¶ãÿling, C.; Gouanãre, M.; Grant, A.; Graziani, G.; Guglielmi, A.; Hagner, C.; Hernando, J.; Hurst, P.; Hyett, N.; Iacopini, E.; Joseph, C.; Juget, F.; Kent, N.; Klimov, O.; Kokkonen, J.; Kovzelev, A.; Krasnoperov, A.; Kim, J. J.; Kirsanov, M.; Kulagin, S.; Lacaprara, S.; Lachaud, C.; LakiÄ‡, B.; Lanza, A.; La Rotonda, L.; Laveder, M.; Letessier-Selvon, A.; Levy, J. -M.; Ling, J.; Linssen, L.; LjubiÄ iÄ‡, A.; Long, J.; Lupi, A.; Lyubushkin, V.; Marchionni, A.; Martelli, F.; Mã©chain, X.; Mendiburu, J. -P.; Meyer, J. -P.; Mezzetto, M.; Moorhead, G. F.; Naumov, D.; Nã©dã©lec, P.; Nefedov, Yu.; Nguyen-Mau, C.; Orestano, D.; Pastore, F.; Peak, L. S.; Pennacchio, E.; Pessard, H.; Petti, R.; Placci, A.; Polesello, G.; Pollmann, D.; Polyarush, A.; Poulsen, C.; Popov, B.; Rebuffi, L.; Rico, J.; Riemann, P.; Roda, C.; Salvatore, F.; Samoylov, O.; Schahmaneche, K.; Schmidt, B.; Schmidt, T.; Sconza, A.; Scott, A. M.; Seaton, M. B.; Sevior, M.; Sillou, D.; Soler, F. J. P.; Sozzi, G.; Steele, D.; Stiegler, U.; StipÄ eviÄ‡, M.; Stolarczyk, Th.; Tareb-Reyes, M.; Taylor, G. N.; Tereshchenko, V.; Toropin, A.; Touchard, A. -M.; Tovey, S. N.; Tran, M. -T.; Tsesmelis, E.; Ulrichs, J.; Vacavant, L.; Valdata-Nappi, M.; Valuev, V.; Vannucci, F.; Varvell, K. E.; Veltri, M.; Vercesi, V.; Vidal-Sitjes, G.; Vieira, J. -M.; Vinogradova, T.; Weber, F. V.; Weisse, T.; Wilson, F. F.; Winton, L. J.; Wu, Q.; Yabsley, B. D.; Zaccone, H.; Zuber, K.; Zuccon, P.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - ELETTRONICO. - 706:4-5(2012), pp. 268-275. [10.1016/j.physletb.2011.11.049]

A search for single photon events in neutrino interactions

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

2012-01-01

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. © 2011 Elsevier B.V. All rights reserved. Open access under CC BY license

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	Anno di pubblicazione (Date of publication)
	
				2012
			
	Titolo del periodico (Journal title)
	
				PHYSICS LETTERS. SECTION B
			
	Numero e parte del fascicolo (Issue number and part)
	
				4-5
			
	DOI
	
				https://dx.doi.org/10.1016/j.physletb.2011.11.049
			
	Codice Scopus (Scopus identifier)
	
				2-s2.0-84155162866
			
	Codice WOS (WOS identifier)
	
				WOS:000299756800006
			
	Tutti gli autori
	
						Kullenberg, C. T.; Mishra, S. R.; Dimmery, D.; Tian, X. C.; Autiero, D.; Gninenko, S.; Rubbia, A.; Alekhin, S.; Astier, P.; Baldisseri, A.; Baldo-Ceol...espandi
						
	Citazione
	
				A search for single photon events in neutrino interactions / Kullenberg, C. T.; Mishra, S. R.; Dimmery, D.; Tian, X. C.; Autiero, D.; Gninenko, S.; Rubbia, A.; Alekhin, S.; Astier, P.; Baldisseri, A.; Baldo-Ceolin, M.; Banner, M.; Bassompierre, G.; Benslama, K.; Besson, N.; Bird, I.; Blumenfeld, B.; Bobisut, F.; Bouchez, J.; Boyd, S.; Bueno, A.; Bunyatov, S.; Camilleri, L.; Cardini, A.; Cattaneo, P. W.; Cavasinni, V.; Cervera-Villanueva, A.; Challis, R.; Chukanov, A.; Collazuol, G.; Conforto, G.; Conta, C.; Contalbrigo, M.; Cousins, R.; Degaudenzi, H.; De Santo, A.; Del Prete, T.; Di Lella, L.; do Couto e Silva, E.; Dumarchez, J.; Ellis, M.; Feldman, G. J.; Ferrari, R.; Ferrãre, D.; Flaminio, V.; Fraternali, M.; Gaillard, J. -M.; Gangler, E.; Geiser, A.; Geppert, D.; Gibin, D.; Godley, A.; Gomez-Cadenas, J. -J.; Gosset, J.; Gã¶ãÿling, C.; Gouanãre, M.; Grant, A.; Graziani, G.; Guglielmi, A.; Hagner, C.; Hernando, J.; Hurst, P.; Hyett, N.; Iacopini, E.; Joseph, C.; Juget, F.; Kent, N.; Klimov, O.; Kokkonen, J.; Kovzelev, A.; Krasnoperov, A.; Kim, J. J.; Kirsanov, M.; Kulagin, S.; Lacaprara, S.; Lachaud, C.; LakiÄ‡, B.; Lanza, A.; La Rotonda, L.; Laveder, M.; Letessier-Selvon, A.; Levy, J. -M.; Ling, J.; Linssen, L.; LjubiÄ iÄ‡, A.; Long, J.; Lupi, A.; Lyubushkin, V.; Marchionni, A.; Martelli, F.; Mã©chain, X.; Mendiburu, J. -P.; Meyer, J. -P.; Mezzetto, M.; Moorhead, G. F.; Naumov, D.; Nã©dã©lec, P.; Nefedov, Yu.; Nguyen-Mau, C.; Orestano, D.; Pastore, F.; Peak, L. S.; Pennacchio, E.; Pessard, H.; Petti, R.; Placci, A.; Polesello, G.; Pollmann, D.; Polyarush, A.; Poulsen, C.; Popov, B.; Rebuffi, L.; Rico, J.; Riemann, P.; Roda, C.; Salvatore, F.; Samoylov, O.; Schahmaneche, K.; Schmidt, B.; Schmidt, T.; Sconza, A.; Scott, A. M.; Seaton, M. B.; Sevior, M.; Sillou, D.; Soler, F. J. P.; Sozzi, G.; Steele, D.; Stiegler, U.; StipÄ eviÄ‡, M.; Stolarczyk, Th.; Tareb-Reyes, M.; Taylor, G. N.; Tereshchenko, V.; Toropin, A.; Touchard, A. -M.; Tovey, S. N.; Tran, M. -T.; Tsesmelis, E.; Ulrichs, J.; Vacavant, L.; Valdata-Nappi, M.; Valuev, V.; Vannucci, F.; Varvell, K. E.; Veltri, M.; Vercesi, V.; Vidal-Sitjes, G.; Vieira, J. -M.; Vinogradova, T.; Weber, F. V.; Weisse, T.; Wilson, F. F.; Winton, L. J.; Wu, Q.; Yabsley, B. D.; Zaccone, H.; Zuber, K.; Zuccon, P.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - ELETTRONICO. - 706:4-5(2012), pp. 268-275. [10.1016/j.physletb.2011.11.049]
			
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