Inclusive J production in Z0 decays is observed via the leptonic decay mode J --> l+ l- (l = e,mu). We measure the branching ratio Br(Z0 --> J + X) = (4.1 +/- 0.7 (stat.) +/- 0.3 (sys.)) x 10(-3). We have calculated the fraction of the J mesons from b-hadron decay and find a branching ratio of Br(b --> J + X) = (1.3 +/- 0.2 (stat.) +/- 0.2 (sys.)) x 10(-2). We determine the average fractional energy of bottom hadrons [x(E)] = 0.70 +/- 0.03 (stat. ) +0.02/-0.01 (sys. ) using the momentum spectrum of the J mesons. From a study of the angle between the J and the most energetic jet, we set an upper limit on the branching ratio Br(Z0 --> qqg*BAR;g* --> J + X) < 7.0 x 10(-4) at 90% confidence level.

Inclusive J-production In Z(0) Decays / O. ADRIANI, M. AGUILARBENITEZ, S. AHLEN, H. AKBARI, J. ALCARAZ, A. ALOISIO, G. ALVERSON, M. G. ALVIGGI, G. AMBROSI, Q. AN, H. ANDERHUB, A. L. ANDERSON, V. P. ANDREEV, T. ANGELOV, L. ANTONOV, D. ANTREASYAN, P. ARCE, A. AREFIEV, A. ATAMANCHUK, T. AZEMOON, et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 288:(1992), pp. 412-420. [10.1016/0370-2693(92)91121-O]

Inclusive J-production In Z(0) Decays

ADRIANI, OSCAR;D'ALESSANDRO, RAFFAELLO;M. LENTI;
1992

Abstract

Inclusive J production in Z0 decays is observed via the leptonic decay mode J --> l+ l- (l = e,mu). We measure the branching ratio Br(Z0 --> J + X) = (4.1 +/- 0.7 (stat.) +/- 0.3 (sys.)) x 10(-3). We have calculated the fraction of the J mesons from b-hadron decay and find a branching ratio of Br(b --> J + X) = (1.3 +/- 0.2 (stat.) +/- 0.2 (sys.)) x 10(-2). We determine the average fractional energy of bottom hadrons [x(E)] = 0.70 +/- 0.03 (stat. ) +0.02/-0.01 (sys. ) using the momentum spectrum of the J mesons. From a study of the angle between the J and the most energetic jet, we set an upper limit on the branching ratio Br(Z0 --> qqg*BAR;g* --> J + X) < 7.0 x 10(-4) at 90% confidence level.
1992
288
412
420
O. ADRIANI;M. AGUILARBENITEZ;S. AHLEN;H. AKBARI;J. ALCARAZ;A. ALOISIO;G. ALVERSON;M. G. ALVIGGI;G. AMBROSI;Q. AN;H. ANDERHUB;A. L. ANDERSO...espandi
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/772738
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