Inclusive production of the η and ω mesons in Z decays, and the muonic branching ratio of the ω

6533b823fe1ef96bd127e201

RESEARCH PRODUCT

Inclusive production of the η and ω mesons in Z decays, and the muonic branching ratio of the ω

A. Heister S. Schael R. Barate I. De Bonis D. Decamp C. Goy J.-p. Lees E. Merle M.-n. Minard B. Pietrzyk G. Boix S. Bravo M.p. Casado M. Chmeissani J.m. Crespo E. Fernandez M. Fernandez-bosman Ll. Garrido E. Graugés M. Martinez G. Merino R. Miquel Ll.m. Mir A. Pacheco H. Ruiz A. Colaleo D. Creanza M. De Palma G. Iaselli G. Maggi M. Maggi S. Nuzzo A. Ranieri G. Raso F. Ruggieri G. Selvaggi L. Silvestris P. Tempesta A. Tricomi G. Zito X. Huang J. Lin Q. Ouyang T. Wang Y. Xie R. Xu S. Xue J. Zhang L. Zhang W. Zhao D. Abbaneo P. Azzurri O. Buchmüller M. Cattaneo F. Cerutti B. Clerbaux H. Drevermann R.w. Forty M. Frank F. Gianotti T.c. Greening J.b. Hansen J. Harvey D.e. Hutchcroft P. Janot B. Jost M. Kado P. Mato A. Moutoussi F. Ranjard L. Rolandi D. Schlatter O. Schneider G. Sguazzoni W. Tejessy F. Teubert A. Valassi I. Videau J. Ward F. Badaud A. Falvard P. Gay P. Henrard J. Jousset B. Michel S. Monteil J.-c. Montret D. Pallin P. Perret J.d. Hansen J.r. Hansen P.h. Hansen B.s. Nilsson A. Wäänänen A. Kyriakis C. Markou E. Simopoulou A. Vayaki K. Zachariadou A. Blondel G. Bonneaud J.-c. Brient A. Rougé M. Rumpf M. Swynghedauw M. Verderi H. Videau V. Ciulli E. Focardi G. Parrini A. Antonelli M. Antonelli G. Bencivenni G. Bologna F. Bossi P. Campana G. Capon V. Chiarella P. Laurelli G. Mannocchi F. Murtas G.p. Murtas L. Passalacqua M. Pepe-altarelli P. Spagnolo A. Halley J.g. Lynch P. Negus V. O'shea C. Raine A.s. Thompson S. Wasserbaech R. Cavanaugh S. Dhamotharan C. Geweniger P. Hanke G. Hansper V. Hepp E.e. Kluge A. Putzer J. Sommer K. Tittel S. Werner M. Wunsch R. Beuselinck D.m. Binnie W. Cameron P.j. Dornan M. Girone N. Marinelli J.k. Sedgbeer J.c. Thompson V.m. Ghete P. Girtler E. Kneringer D. Kuhn G. Rudolph E. Bouhova-thacker C.k. Bowdery A.j. Finch F. Foster G. Hughes R.w.l. Jones M.r. Pearson N.a. Robertson K. Jakobs K. Kleinknecht G. Quast B. Renk H.-g. Sander H. Wachsmuth C. Zeitnitz A. Bonissent J. Carr P. Coyle O. Leroy P. Payre D. Rousseau M. Talby F. Ragusa A. David H. Dietl G. Ganis K. Hüttmann G. Lütjens C. Mannert W. Männer H.-g. Moser R. Settles H. Stenzel W. Wiedenmann G. Wolf J. Boucrot O. Callot M. Davier L. Duflot J.-f. Grivaz Ph. Heusse A. Jacholkowska J. Lefrançois J.-j. Veillet C. Yuan G. Bagliesi T. Boccali L. Foà A. Giammanco A. Giassi F. Ligabue A. Messineo F. Palla G. Sanguinetti A. Sciabà R. Tenchini A. Venturi P.g. Verdini G.a. Blair G. Cowan M.g. Green T. Medcalf A. Misiejuk J.a. Strong P. Teixeira-dias J.h. Von Wimmersperg-toeller R.w. Clifft T.r. Edgecock P.r. Norton I.r. Tomalin B. Bloch-devaux P. Colas S. Emery W. Kozanecki E. Lançon M.-c. Lemaire E. Locci P. Perez J. Rander J.-f. Renardy A. Roussarie J.-p. Schuller J. Schwindling A. Trabelsi B. Vallage N. Konstantinidis A.m. Litke G. Taylor A. Beddall C.n. Booth S. Cartwright F. Combley M. Lehto L.f. Thompson K. Affholderbach A. Böhrer S. Brandt C. Grupen A. Ngac G. Prange U. Sieler G. Giannini J. Rothberg S.r. Armstrong K. Berkelman K. Cranmer D.p.s. Ferguson Y. Gao S. González O.j. Hayes H. Hu S. Jin J. Kile P.a. Mcnamara J. Nielsen Y.b. Pan J.h. Von Wimmersperg-toeller W. Wiedenmann J. Wu Sau Lan Wu X. Wu G. Zobernig G. Dissertori

subject

Physics Particle physics Nuclear and High Energy Physics Meson 010308 nuclear & particles physics Branching fraction Electron–positron annihilation Hadron 01 natural sciences Nuclear physics 0103 physical sciences Production (computer science)010306 general physics Event (particle physics)Production rate

description

AbstractThe inclusive production of the η and ω(782) mesons is measured in the π+π−π0 decay mode in hadronic Z decays and compared to model predictions. The analysis is based on 4 million hadronic Z decays recorded by the ALEPH detector between 1991 and 1995. The η production rate for xp=pmeson/pbeam>0.10 is found to be 0.355±0.011stat±0.024sys per event, and the ω production rate for xp>0.05 is measured as 0.585±0.019stat±0.033sys per event. The branching ratio for ω→μ+μ− is investigated. A total of 18.1±5.9 events are observed, from which the muonic branching ratio is measured for the first time to be BR(ω→μ+μ−)=(9.0±2.9stat±1.1sys)×10−5.

year	journal	country	edition	language
2002-02-01	Physics Letters B

10.1016/s0370-2693(02)01220-0 http://dx.doi.org/10.1016/s0370-2693(02)01220-0