A B(4)C silicon target for the detection of neutrino interactions

作者：Altegoer J, Angelini C, 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 G, Conforto G, Conta C, Contalbrigo M, Cousins R, Daniels D, Degaudenzi H, Del Prete T, De Santo A, Dignan T, Di Lella L, Silva Ede, Donnelly IJ, Dumarchez J, Fazio T, Feldman GJ, Ferrari R, Ferrere D, Flaminio V, Fraternali M, Fumagalli G, Gaillard JM, Galumian P, Gangler E, Geiser A, Geppert D, Gibin D, Gninenko S, Gomez Cadenas JJ, Gosset J, Gossling C, Gouanere M, Grant A, Graziani G, Guglielmi A, Hagner C, Hernando J, Hubbard D, Hurst P, Hyett N, Iacopini E, Joseph C, Juget F, Kekez D, Khomenko B, Kirsanov M, Klimov O, Kokkonen J, Kovzelev A, Kuznetsov VE, Lacaprara S, Lanza A, La Rotonda L, Laveder M, Lazzeroni C, Letessier Selvon A, Levy JM, Linssen L, Ljubicic A, Long J, Lupi A, Manola Poggioli E, Marchionni A, Mechain X, Mendiburu JP, Meyer JP, Mezzetto M, Mishra SR, Moorhead GF, Mossuz L, Nedelec P, Nefedov Y, Nguyen Mau C, Orestano D, 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, Renzoni G, Roda C, Rubbia A, Salvatore F, Scannicchio D, Schahmaneche K, Schmidt B, Sconza A, Serrano M, Sevior M, Sillou D, Soler FJP, Sozzi G, Steele D, Steffen P, Steininger M, Stiegler U, Stipcevic M, Stolarczyk T, Tareb Reyes M, Taylor GN, Tereshchenko V, Toropin A, Touchard AM, Tovey SN, Tran MT, Tsesmelis E, Ulrichs J, Uros V, Vacavant L, Valdata Nappi M, Valuev V, Vannucci F, Varvell KE, Vercesi V, Verkindt D, Vieira JM, Vinogradova T, Vo MK, Volkov S, Weber FV, Weisse T, Werlen M, Wilson FF, Winton LJ, Yabsley BD, Zaccone H, Zuber K., Filippo Martelli, M. Veltri · 发表于：Padua Research Archive (University of Padova) · 年份：1997 · DOI：10.1016/s · 被引用次数：520 · 研究领域：Growth Hormone and Insulin-like Growth Factors

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.