A measurement of the QCD colour factors and a limit on the light gluino

6533b85ffe1ef96bd12c1ddf

RESEARCH PRODUCT

A measurement of the QCD colour factors and a limit on the light gluino

Armstrong S Schael G Lutjens M. Chmeissani G. R. Bonneaud M H. Lehto A Juste M Thulasidas H Dietl K Jakobs C Benchouk G Lutters J Sommer Am Litke X Wu L. Rolandi E. Lancon G Giannini Hansen Rw Clifft Ir Tomalin P Saraiva P Payre Giorgio Maggi Lucia Silvestris P. Bourdon S Haywood A. Blondel C Padilla O. Callot Jordan Nash P Henrard Tc Greening H Stenzel Pa Mcnamara A. Trabelsi D Zerwas As Thompson Ja Strong Arnaud Lucotte B Pietrzyk L Moneta G Gelao P Perrodo B Jost M Frank I. Siotis Ga Blair G. Capon O'shea Jj Veillet Hg Sander E Simopoulou E Fernandez A Putzer F Ranjard L. F. Thompson Ao Bazarko Ao Bazarko L. Passalacqua R. Barate Giuseppe Iaselli A Moutoussi S Xue Dps Ferguson Claudine Boyer T Fearnley G Lutz Mi Williams C. Grupen W Tejessy R. Denis Dw Kim D Rousseau J. Grahl G Bujosa P. Tempesta A.e. Wright S Bettarini F. Sanchez P Coyle R Settles C. N. Booth Ck Bowdery P Heusse Pj Dornan G. Hansper Mg Green Kelly L Duflot S. Gonzalez A. Antonelli L Garrido L Garrido M. Pepe-altarelli K Tittel Jm Nachtman C Goy Ig Knowles Chiarella De Jaffe S Nuzzo D. Pallin Mi Parsons P Colas A. Tricomi A. Jacholkowska M. Verderi Oj Hayes Jm Rossignol Jm Yamartino A Kyriakis Mc Lemaire J.h. Dann Jp Schuller Eb Martin L Zhang A Roussarie A Messineo D. J. Candlin P. Comas G. Bencivenni M. Aleppo Q Ouyang S Monteil A Bonissent F. Ligabue C Georgiopoulos D. Casper R Boswell G Dissertori G. Zobernig P Vangemmeren R Alemany G. Mannocchi A Minten Sj Dorris Jf Renardy A Hocker Lorenzo Foà Lorenzo Foà A Rouge A. Wäänänen Ic Park Z. Y. Feng Z. Y. Feng S. L. Wu P. Bright-thomas G Rizzo Ps Marrocchesi A Pascual Jh Vonwimmerspergtoeller Rw Forty Philippe Odier A Cordier Hepp G. Batignani D Schlatter T Sloan J.y. Nief G Bagliesi M. N. Minard Ma Giorgi P. Laurelli P Ghez M Corden A. Böhrer F Palla X Huang M Talby F Podlyski Giovanna Selvaggi L Bosisio Hg Moser R Beuselinck M. Carpinelli M Girone I Lehraus H. Y. Kim Maria Agnese Ciocci A. Vayaki J. P. Lees S Brandt A Sadouki G Cowan Caj Brew Guido Tonelli Guido Tonelli W Zhao M Rumpf P Elmer Rm Turnbull W Blum Am Lutz C Raine G Ganis H Wachsmuth Si Chen Ja Perlas F Cerutti H Kroha G. Zito P Maley J Steinberger R Tenchini G Wolf G Hughes L Smolik W Orejudos P Rosnet A Gregorio C Zeitnitz I Ferrante S. L. Cartwright Gp Murtas Evelyn Thomson R Maggi W Wiedenmann D Abbaneo Donato Creanza A Falvard J Walsh I Nikolic J Boucrot C Diaconu Mp Casado A. Rosado-schlosser Y Xie A Giassi Rp Johnson A Venturi P Azzurri Jm Crespo F. Ruggieri E Kneringer Jf Pusztaszeri R Fantechi Bs Nilsson T Medcalf Aw Halley Young-il Choi P Colrain Buscher C Gotzhein S. Orteu W Cameron C Vannini P Perret R Xu Jk Sedgbeer M Cattaneo I.j. Scott J-c. Brient J Carr M Wunsch Ap Betteridge O Leroy J Lin Ziad Ajaltouni C. Hoffmann E Rohne Wm Newton J Jousset I Videau A. Wagner P Girtler Pg Verdini M Delfino B Gobbo B Renk A Sciaba G. Daskalakis J. J. Aubert M Depalma P. H. Hansen G Parrini G Calderini G. Rudolph M. Fernandez-bosman J Reeve I Riu P Perez A Barres S.n. Black R Richter F. Murtas P. Rensing Y Saadi P. Campana B. Rensch F Ragusa F Ragusa M. H. Schune L. M. Mir Am Stacey G Quast A Colaleo D Kuhn M.g. Schmidt A. Valassi P Hanke J-c. Montret H Seywerd K. Trabelsi Am Greene G Musolino M Davier F Combley J. Schwindling Jg Lynch K Zachariadou B Michel M Schmitt F. Dydak F. Dydak A. J. Finch N Konstantinidis J Zhang Yang Gao P Mato F Teubert A Pacheco H Hu A Ranieri W. Kozanecki F. Forti M Martinez Y. S. Gao Y. S. Gao C. Guicheney C. Ferdi H Drevermann G. Raso Lm Bryant J Harvey C. Markou D Decamp Dm Binnie E Locci S Wasserbaech G Sanguinetti N. Marinelli I. Giehl Pr Norton Jb Hansen C Geweniger M. Apollonio U Becker F. Thomson G. Felici Patrick Janot A. Galla J Knobloch Jm Scarr Jt Chambers M. Zheng J Rothberg R. Berlich M Jacquet Ma Mcneil T Wang Williams R Dellorso R Hagelberg A. Lusiani H Videau S. Goodsir Ciulli K Smith R Miquel B. Bloch-devaux E Focardi J Proriol P. Spagnolo J.d. Hansen J Lefrancois F Lediberder S. Emery Yb Pan W Manner L Curtis T. R. Edgecock F. Bossi P. Teixeira-dias G Graefe J Rander S Simion R Dellamarina D Buskulic K Kleinknecht G Bologna S Werner F. Etienne G Crawford J-f Grivaz E-e Kluge F Stephan David Calvet M. Schmelling M. Schmelling G Taylor Botterill C. Bozzi B. Vallage Hj Park F Foster Jc Thompson O Schneider

subject

Quantum chromodynamics Physics Gluino Particle physics Physics and Astronomy (miscellaneous)Physics Electron–positron annihilation High Energy Physics::Phenomenology Lower limit Nuclear physics Strong coupling High Energy Physics::Experiment Limit (mathematics)Particle Physics - Experiment Particle Physics - Phenomenology

description

Using data collected from 1992 to 1995 with the ALEPH detector at LEP, a measurement of the colour factor ratios C-A/C-F and T-F/C-F and the strong coupling constant = C-F alpha(s), (M-Z)/(2 pi) has been performed by fitting theoretical predictions simultaneously to the measured differential two-jet rate and angular distributions in four-jet events. The result is found to be in excellent agreement with QCD. C-A/C-F = 2.20 +/- 0.09 (stat) +/- 0.13 (syst), T-F/C-F = 0.29 +/- 0.05 (stat) +/- 0.06 (syst). Fixing C-A/C-F and T-F/C-F to the QCD values permits a determination of alpha(s) (M-Z) and n(f), the number of active flavours. With this measurement the existence of a gluino with mass below 6.3 GeV/c(2) is excluded at 95% confidence level. RI ANTONELLI, ANTONELLA/C-6238-2011; Passalacqua, Luca/F-5127-2011; Murtas, Fabrizio/B-5729-2012; Sanchez, Federico/F-5809-2012; Forti, Francesco/H-3035-2011; Ferrante, Isidoro/F-1017-2012

year	journal	country	edition	language
1997-01-01

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