Search for a new gauge boson in pi(0) decays RID B-6634-2009 RID C-6672-2008

, gamma + X decay from neutral pions generated by 450 GeV protons in the CERN SPS neutrino target. The X's would penetrate the downstream shielding and be observed in the NOMAD detector via the Primakoff effect, in the process of X --> pi(0) conversion in the external Coulomb field of a nucleus. With 1.45 x 10(18) protons on target, 20 candidate events with energy between 8 and 140 GeV were found from the analysis of neutrino data. This number is in agreement with the expectation of 18.1 +/- 2.8 background events from standard neutrino processes. A new 90% C.L. upper limit on the branching ratio Br(pi(0) --> Y + X)< (3.3 to 1.9)X 10(-5) for X masses ranging from 0 to 120 MeV/c(2) is obtained. (C) 1998 Elsevier Science B.V. All rights reserved. -->
Přístupová URL adresa: https://explore.openaire.eu/search/publication?articleId=od______3668::c3b16565cce12fe43ba969ea242f54e0
https://hdl.handle.net/11590/119868
Rights: OPEN
Přírůstkové číslo: edsair.od......3668..c3b16565cce12fe43ba969ea242f54e0
Autor: Altegoer J, Astier P, Autiero D, Baldisseri A, Baldo Ceolin M, Ballocchi G, Banner M, Basa S, Bassompierre G, Benslama K, Besson N, Bird I, Blumenfeld B, Bobisut F, Bouchez J, Boyd S, Bueno A, Bunyatov S, Camilleri L, Cardini A, Castera A, Cattaneo PW, Cavasinni V, Cervera Villanueva A, Collazuol GM, Conforto G, Conta C, Contalbrigo M, Cousins R, Daniels D, De Santo A, Del Prete T, Dignan T, Di Lella L, Silva EDE, Donnelly IJ, Dumarchez J, Fazio T, Feldman GJ, Ferrari R, Ferrere D, Flaminio V, Fraternali M, Gaillard JM, Galumian P, Gangler E, Geiser A, Geppert D, Gibin D, Gninenko SN, Gomez Cadenas JJ, Gosset J, Gossling CC, Gouanere M, Grant A, Graziani G, Guglielmi A, Hagner C, Hernando J, Hubbard D, Hurst P, Hyett N, Iacopini E, Joseph C, Kekez D, Khomenko B, Kirsanov MM, Klimov O, Kokkonen J, Kovzelev AV, Kuznetsov V, Lacaprara S, Lanza A, La Rotonda L, Laveder M, Letessier Selvon A, Levy JM, Linssen L, Ljubicic A, Long J, Lupi A, Manola Poggioli E, Marchionni A, Martelli F, Mechain X, Mendiburu JP, Meyer JP, Mezzetto M, Mishra SR, Moorhead GF, Mossuz L, Nedelec P, Nefedov Y, Nguyen Mau C, Pastore F, Peak LS, Pennacchio E, Perroud JP, Pessard H, Petti R, Placci A, Plothow Besch H, Pluquet A, Polesello G, Pollmann D, Pope BG, Popov B, Poulsen C, Rathouit P, Roda C, Rubbia A, Salvatore F, Scannicchio D, Schahmaneche K, Schmidt B, Sconza A, Serrano M, Sevior ME, Sillou D, Soler FJP, Sozzi G, Steele D, Steffen P, Steininger M, Stiegler U, Stipcevic M, Stolarczyk T, Tareb Reyes M, Taylor GN, Tereshchenko S, Toropin AN, Touchard AM, Tovey SN, Tran MT, Tsesmelis E, Ulrichs J, Uros V, Valdata Nappi M, Valuev V, Vannucci F, Varvell KE, Veltri M, Vercesi V, Verkindt D, Vieira JM, Vinogradova T, Vo MK, Volkov SA, Weber F, Weisse T, Werlen M, Wilson F, Winton LJ, Yabsley BD, Zaccone H., ORESTANO, DOMIZIA
Přispěvatelé: Altegoer, J, Astier, P, Autiero, D, Baldisseri, A, Baldo Ceolin, M, Ballocchi, G, Banner, M, Basa, S, Bassompierre, G, Benslama, K, Besson, N, Bird, I, Blumenfeld, B, Bobisut, F, Bouchez, J, Boyd, S, Bueno, A, Bunyatov, S, Camilleri, L, Cardini, A, Castera, A, Cattaneo, Pw, Cavasinni, V, Cervera Villanueva, A, Collazuol, Gm, Conforto, G, Conta, C, Contalbrigo, M, Cousins, R, Daniels, D, De Santo, A, Del Prete, T, Dignan, T, Di Lella, L, Silva, Ede, Donnelly, Ij, Dumarchez, J, Fazio, T, Feldman, Gj, Ferrari, R, Ferrere, D, Flaminio, V, Fraternali, M, Gaillard, Jm, Galumian, P, Gangler, E, Geiser, A, Geppert, D, Gibin, D, Gninenko, Sn, Gomez Cadenas, Jj, Gosset, J, Gossling, Cc, Gouanere, M, Grant, A, Graziani, G, Guglielmi, A, Hagner, C, Hernando, J, Hubbard, D, Hurst, P, Hyett, N, Iacopini, E, Joseph, C, Kekez, D, Khomenko, B, Kirsanov, Mm, Klimov, O, Kokkonen, J, Kovzelev, Av, Kuznetsov, V, Lacaprara, S, Lanza, A, La Rotonda, L, Laveder, M, Letessier Selvon, A, Levy, Jm, Linssen, L, Ljubicic, A, Long, J, Lupi, A, Manola Poggioli, E, Marchionni, A, Martelli, F, Mechain, X, Mendiburu, Jp, Meyer, Jp, Mezzetto, M, Mishra, Sr, Moorhead, Gf, Mossuz, L, Nedelec, P, Nefedov, Y, Nguyen Mau, C, Orestano, Domizia, Pastore, F, Peak, L, Pennacchio, E, Perroud, Jp, Pessard, H, Petti, R, Placci, A, Plothow Besch, H, Pluquet, A, Polesello, G, Pollmann, D, Pope, Bg, Popov, B, Poulsen, C, Rathouit, P, Roda, C, Rubbia, A, Salvatore, F, Scannicchio, D, Schahmaneche, K, Schmidt, B, Sconza, A, Serrano, M, Sevior, Me, Sillou, D, Soler, Fjp, Sozzi, G, Steele, D, Steffen, P, Steininger, M, Stiegler, U, Stipcevic, M, Stolarczyk, T, Tareb Reyes, M, Taylor, Gn, Tereshchenko, S, Toropin, An, Touchard, Am, Tovey, Sn, Tran, Mt, Tsesmelis, E, Ulrichs, J, Uros, V, Valdata Nappi, M, Valuev, V, Vannucci, F, Varvell, Ke, Veltri, M, Vercesi, V, Verkindt, D, Vieira, Jm, Vinogradova, T, Vo, Mk, Volkov, Sa, Weber, F, Weisse, T, Werlen, M, Wilson, F, Winton, Lj, Yabsley, Bd, Zaccone, H.
Rok vydání: 1998
Popis: A search was made for a new light gauge boson X which might be produced in pi(0) -->, gamma + X decay from neutral pions generated by 450 GeV protons in the CERN SPS neutrino target. The X's would penetrate the downstream shielding and be observed in the NOMAD detector via the Primakoff effect, in the process of X --> pi(0) conversion in the external Coulomb field of a nucleus. With 1.45 x 10(18) protons on target, 20 candidate events with energy between 8 and 140 GeV were found from the analysis of neutrino data. This number is in agreement with the expectation of 18.1 +/- 2.8 background events from standard neutrino processes. A new 90% C.L. upper limit on the branching ratio Br(pi(0) --> Y + X)< (3.3 to 1.9)X 10(-5) for X masses ranging from 0 to 120 MeV/c(2) is obtained. (C) 1998 Elsevier Science B.V. All rights reserved.
Databáze: OpenAIRE
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