Study of the subjet structure of quark and gluon jets

6533b85afe1ef96bd12b9fd0

RESEARCH PRODUCT

Study of the subjet structure of quark and gluon jets

Buskulic D Casper D Debonis I Decamp D Ghez P Goy C Lees Jp Minard Mn Odier P Pietrzyk B Ariztizabal F Chmeissani M Crespo Jm Efthymiopoulos I Fernandez E Fernandezbosman M Gaitan V Garrido L Martinez M Orteu S Pacheco A Padilla C Palla F Pascual A Perlas Ja Sanchez F Teubert F Creanza D Depalma M Farilla A Iaselli G Maggi G Marinelli N Natali S Nuzzo S Ranieri A Raso G Romano F Ruggieri F Selvaggi G Silvestris L Tempesta P Zito G Huang X Lin J Ouyang Q Wang T Xie Y Xu R Xue S Zhang J Zhang L Zhao W Bonvicini G Cattaneo M Comas P Coyle P Drevermann H Engelhardt A Forty Rw Frank M Ganis G Girone M Hagelberg R Harvey J Jacobsen R Jost B Knobloch J Lehraus I Maggi M Markou C Martin Eb Mato P Meinhard H Minten A Miquel R Palazzi P Pater Jr Perrodo P Pusztaszeri Jf Ranjard F Schlatter D Schmelling M Tejessy W Tomalin Ir Veenhof R Venturi A Wachsmuth H Wiedenmann W Wildish T Witzeling W Wotschack J Ajaltouni Z Bardadinotwinowska M Barres A Boyer C Falvard A Gay P Guicheney C Henrard P Jousset J Michel B Monteil S Montret Jc Pallin D Perret P Podlyski F Proriol J Rossignol Jm Saadi F Fearnley T Hansen Jb Hansen Jd Hansen Jr Hansen Ph Johnson Sd Nilsson Bs Kyriakis A Simopoulou E Siotis I Vayaki A Zachariadou K Blondel A Bonneaud G Brient Jc Bourdon P Passalacqua L Rouge A Rumpf M Tanaka R Valassi A Verderi M Videau H Candlin Dj Parsons Mi Veitch E Focardi E Parrini G Cordon M Delfino M Georgiopoulos C Jaffe De Antonelli A Bencivenni G Bologna G Bossi F Campana P Capon G Cerutti F Chiarella V Felici G Laurelli P Mannocchi G Murtas F Murtas Gp Pepealtarelli M Salomone S Colrain P Tenhave I Knowles Ig Lynch Jg Maitland W Morton Wt Raine C Reeves P Scarr Jm Smith K Smith Mg Thompson As Thorn S Turnbull Rm Becker U Braun O Geweniger C Graefe G Hanke P Hepp V Kluge Ee Putzer A Rensch B Schmidt M Sommer J Stenzel H Tittel K Wunsch M Beuselinck R Binnie Dm Cameron W Colling Dj Dornan Pj Konstantinidis N Moneta L Moutoussi A Nash J Sanmartin G Sedgbeer Jk Stacey Am Dissertori G Girtler P Kneringer E Kuhn D Rudolph G Bowdery Ck Brodbeck Tj Finch Aj Foster F Hughes G Jackson D Keemer Nr Nuttall M Patel A Sloan T Snow Sw Whelan Ep Galla A Greene Am Kleinknecht K Raab J Renk B Sander Hg Schmidt H Walther Sm Wanke R Wolf B Aubert Jj Bencheikh Am Benchouk C Bonissent A Bujosa G Calvet D Carr J Diaconu C Etienne F Thulasidas M Nicod D Payre P Rousseau D Talby M Abt I Assmann R Bauer C Blum W Brown D Dietl H Dydak F Gotzhein C Halley Aw Jakobs K Kroha H Lutjens G Lutz G Manner W Moser Hg Richter R Rosadoschlosser A Schwarz As Settles R Seywerd H Stierlin U Stdenis R Wolf G Alemany R Boucrot J Callot O Cordier A Courault F Davier M Duflot L Grivaz Jf Heusse P Jacquet M Janot P Kim Dw Lediberder F Lefrancois J Lutz Am Musolino G Nikolic I Park Hj Park Ic Schune Mh Simion S Veillet Jj Videau I Abbaneo D Bagliesi G Batignani G Bettarini S Bottigli U Bozzi C Calderini G Carpinelli M Ciocci Ma Ciulli V Dellorso R Ferrante I Fidecaro F Foa L Forti F Giassi A Giorgi Ma Gregorio A Alberto Lusiani Marrocchesi Ps Messineo A Rizzo G Sanguinetti G Sciaba A Spagnolo P Steinberger J Tenchini R Tonelli G Triggiani G Vannini C Verdini Pg Walsh J Betteridge Ap Blair Ga Bryant Lm Gao Y Green Mg Johnson Dl Medcalf T Mir Lm Strong Ja Bertin V Botterill Dr Clifft Rw Edgecock Tr Haywood S Edwards M Maley P Norton Pr Thompson Jc Blochdevaux B Colas P Duarte H Emery S Kozanecki W Lancon E Lemaire Mc Locci E Marx B Perez P Rander J Renardy Jf Rosowsky A Roussarie A Schuller Jp Schwindling J Simohand D A. Trabelsi Vallage B Johnson Rp Litke Am Taylor G Wear J Beddall A Booth Cn Boswell R Cartwright S Combley F Dawson I Koksal A Letho M Newton Wm Rankin C Thompson Lf Bohrer A Brandt S Cowan G Feigl E Grupen C Lutters G Minguetrodriguez J Rivera F Saraiva P Schafer U Smolik L Bosisio L Dellamarina R Giannini G Gobbo B Pitis L Ragusa F Kim H Rothberg J Wasserbaech S Armstrong Sr Bellantoni L Elmer P Feng Z Ferguson Dps Gao Ys Gonzalez S Grahl J Harton Jl Hayes Oj Hu H Mcnamara Pa Nachtman Jm Orejudos W Pan Yb Saadi Y Schmitt M Scott Ij Sharma V Turk Jd Walsh Am Weber Fv Wu Sl Wu X Yamartino Jm Zheng M Zobernig G Ri Antonelli Antonella/c 6238 2011 Passalacqua Luca/f 5127 2011 Murtas Fabrizio/b 5729 2012 S.t. Denis Richard/c 8997 2012 Ferrante Isidoro/f 1017 2012 Sanchez Federico/f 5809 2012 Luigi Rolandi Franco Ligabue

subject

Quantum chromodynamics Physics Quark Nuclear and High Energy Physics Particle physics 010308 nuclear & particles physics Physics Electron–positron annihilation High Energy Physics::Phenomenology Hadron 01 natural sciences Gluon ALEPH Experiment Nuclear physics 0103 physical sciences [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]High Energy Physics::Experiment Nuclear Experiment 010306 general physics ALEPH experiment Particle Physics - Experiment

description

Measurements of the subjet structure of quark and gluon jets in hadronic Z decays are presented. The analysis is based on one million hadronic events recorded by the ALEPH detector. Roughly symmetric three-jet events are selected with a coarse jet-resolution cut-off, y(1). Gluon jets are identified with a purity of 94.6% in those events where evidence of long-lived heavy-flavour hadrons in the other two jets is found. The jets are then analyzed using a smaller cut-off y(0) (< y(1)) so that subjets are resolved. The properties of the jets (subjet multiplicities [N-q], [N-g] and rates R(n)(g(q)) for n = 1,2,3,4) are determined and are found to be in good agreement with the expectations of perturbative QCD as long as the subjet resolution parameter y(0) is sufficiently large to keep non-perturbative effects small. In particular, the ratio [N-g - 1]/[N-q - 1], which to leading order in QCD is given by the ratio of colour factors C-A/C-F = 9/4, is measured to be 1.96 +/- 0.15 for y(0) = 2 . 10(-3), but falls to 1.29 +/- 0.03 for y(0) = 1.6 . 10(-5).

year	journal	country	edition	language
1995-01-01

10.1016/0370-2693(95)00037-l http://cds.cern.ch/record/274604