481 research outputs found
Search for a new light gauge boson with the Crystal Barrel Detector
No full textWe have searched for new light gauge bosons produced in ß 0 , j and j 0 decays by studying the kinematically well-constrained reactions pp ! ß 0 ß 0 P , where P j ß 0 ; j; j 0 decays through the emission of a single photon recoiling against a missing state X (where X is a long-lived weakly interacting particle or X ! ). No signal has been observed and branching ratio upper limits (90 % C:L:) of 6 \Theta 10 \Gamma5 have been obtained for masses of the gauge boson lying between ¸ 65 MeV and 125 MeV (ß 0 decay), 6 \Theta 10 \Gamma5 , for X masses between ¸ 200 MeV and 525 MeV (j decay), and 4 \Theta 10 \Gamma5 , for X masses between ¸ 50 MeV and 925 MeV (j 0 decay). The ß 0 -decay limit represents a factor of 4 to 8 improvement when compared to the existing limit, whereas the j and j 0 decay limits have been measured for the first time, thereby extending the mX range from 130 MeV up to 925 MeV
Pp Annihilation At Rest Into
No full textMatthay b , M. Merkel j 9 , J.P. Merlo j , C.A. Meyer l , L. Montanet e , A. Noble n , F. Ould-Saada n , K. Peters b , C.N. Pinder d , G. Pinter c , S. Ravndal b10 , J. Salk b , A.H. Sanjari h 11 , E. Schafer j , B. Schmid n 12 , P. Schmidt f , S. Spanier j , C. Straßburger j 13 , U. Strohbusch f , M. Suffert m , D. Urner n , C.Volker k , F. Walter f , D. Walther b , U. Wiedner f , N. Winter g , J. Zoll e , B.S. Zou h , C. Zupancic k a University of Cal
Measurement of the Decay Distribution of
No full textandua f , J. Ludemann b , H. Matthay b , R. McCrady n , J. Meier g , C.A. Meyer n , L. Montanet f , R. Ouared f , F. Ould-Saada p , K. Peters b , C. Pietra p , C.N. Pinder e , G. Pinter d , C. Regenfus l , J. Reißmann g , S. Resag c , W. Roethel l , P. Schmidt g , I. Scott i , R. Seibert g , S. Spanier p , H. Stock b , C. Straßburger c , U. Strohbusch g , M. Suffert o , U. Thoma c , M. Tischhauser h , D. Urner p , C. Volcker l , F. Walter k , D. Walther<F
High Statistics Study of
No full textf , J. Ludemann b , H. Matthaey b , R. McCrady l , M. Merkel k 9 , J.P. Merlo k , C.A. Meyer l , L. Montanet f , A. Noble o 10 , F. Ould--Saada o K. Peters b , C.N. Pinder e , G. Pinter d , S. Ravndal b9 , C. Regenfus m , S. Resag c , R. Ruoured f , E. Schafer k , P. Schmidt g , R. Seibert g , S. Spanier o , H. Stock b , C. Straßburger c , U. Strohbusch g , M. Suffert n , U. Thoma c , M. Tischhauser h , D. Urner o , C. Volcker m , F. Walter k , D. Walther b , U. Wiedner g<F2
High-Statistics Study of
No full texta , R. Landua f , F. Loser g , J. Ludemann b , H. Matthay b , M. Merkel k10 , J.P. Merlo k , C.A. Meyer m , L. Montanet f , A. Noble o , F. Ould-Saada o , K. Peters b , C.N. Pinder e , G. Pinter d , S. Ravndal b10 , C. Regenfus l , J. Salk b , E. Schafer k , P. Schmidt g , R. Seibert g , S. Spanier k , H. Stock b , C. Straßburger c , U. Strohbusch g , M. Suffert n , U. Thoma c , D. Urner o , C. Volcker l , F. Walter k , D. Walther b , U. Wiedner g , N
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