Measurement of the charged particle multiplicity distribution in hadronic Z decays

6533b86dfe1ef96bd12c9804

RESEARCH PRODUCT

Measurement of the charged particle multiplicity distribution in hadronic Z decays

D Décamp B Deschizeaux C Goy J P Lees M N Minard R Alemany J M Crespo M C Delfino E Fernández V Gaitan L Garrido M L Mir A Pacheco M G Catanesi D Creanza M De Palma A Farilla Giuseppe Iaselli G Maggi M Maggi S Natali S Nuzzo M Quattromini A Ranieri G Raso F Romano F Ruggieri G Selvaggi L Silvestris P Tempesta G Zito Y Gao H Hu D Huang X Huang J Lin J Lou C Qiao T Ruan T Wang Y Xie D Xu R Xu J Zhang W Zhao W B Atwood L A T Bauerdick F Bird E Blucher G Bonvicini F Bossi J Boudreau D Brown T H Burnett H Drevermann Roger W Forty C Grab R Hagelberg S Haywood J M Hilgart B Jost M Kasemann J Knobloch A Lacourt E Lançon Ivan Lehraus T Lohse A Lusiani A Marchioro M Martínez P Mato S R Menary Adolf G Minten A Miotto R Miquel H G Moser J Nash P Palazzi F Ranjard G Redlinger A E Roth J E Rothberg Herbert Rotscheidt M Saich W D Schlatter M Schmelling M Takashima W Tejessy H W Wachsmuth S R Wasserbaech W Wiedenmann W Witzeling J Wotschack Ziad J Ajaltouni F Badaud Maria Bardadin-otwinowska A M Bencheikh R El-fellous A Falvard P Gay C Guicheney J Harvey P Henrard J Jousset B Michel J C Montret D Pallin P Perret J Proriol F Prulhière G Stimpfl H Bertelsen F Hansen J D Hansen J R Hansen P H Hansen A Lindhal R Møllerud B S Nilsson I Efthymiopoulos Errietta Simopoulou Anna Vayaki J Badier A Blondel G R Bonneaud J Bourotte F Braems J C Brient G Fouque A Gamess R Guirlet S Orteu A Rosowsky A Rougé M Rumpf R Tanaka H L Videau D J Candlin E Veitch L Moneta G Parrini M Corden C H Georgiopoulos M Ikeda J E Lannutti D A Levinthal Michael E Mermikides L Sawyer A Antonelli R Baldini G Bencivenni G Bologna P Campana G Capon F Cerutti V Chiarella B D'ettorre-piazzoli G Felici P Laurelli G Mannocchi F Murtas G P Murtas L Passalacqua M Pepé-altarelli P Picchi P Zografou B Altoon O Boyle A W Halley I Ten Have J A Hearns J G Lynch W T Morton C Raine J M Scarr K Smith A S Thompson R M Turnbull B Brandl O Braun R Geiges C Geweniger P Hanke V Hepp E E Kluge Y Maumary A Putzer B Rensch A Stahl K Tittel M Wunsch A T Belk R Beuselinck David M Binnie W Cameron M Cattaneo Peter J Dornan S Dugeay A M Greene J F Hassard N M Lieske S J Patton D G Payne M J Phillips J K Sedgbeer G Taylor I R Tomalin A G Wright P Girtler D Kuhn G Rudolph C K Bowdery T J Brodbeck A J Finch F Foster G Hughes N R Keemer M Nuttall A D Patel B S Rowlingson Terence Sloan S W Snow E P Whelan T Barczewski K Kleinknecht J Raab B Renk S Roehn H G Sander H Schmidt F Steeg S M Walther B Wolf Jean-jacques Aubert C Benchouk V Bernard A Bonissent J Carr P Coyle J Drinkard F Etienne S Papalexiou P Payre B Pietrzyk Z Qian D Rousseau P Schwemling M Talby H Becker Walter Blum Paolo Walter Cattaneo G D Cowan Bernd Dehning H Dietl Friedrich Dydak M Fernández-bosman Traudl Hansl-kozanecka A Jahn Witold Kozanecki E Lange J Lauber G Lütjens Gerhard Lutz W Männer R H Richter J Schröder A S Schwarz Ronald Settles U Stierlin R Saint-denis J Thomas G Wolf V Bertin J Boucrot O Callot A Cordier M Davier G Ganis J F Grivaz P Heusse P Janot D W Kim F R Le Diberder J Lefrançois A M Lutz J J Veillet I Videau Z Zhang F Zomer D Abbaneo S R Amendolia G Bagliesi G Batignani L Bosisio U Bottigli C Bradaschia M Carpinelli M A Ciocci R Dell'orso I Ferrante F Fidecaro L Foà E Focardi F Forti C Gatto A Giassi M A Giorgi F Ligabue E B Mannelli P S Marrocchesi A Messineo Fabrizio Palla G Sanguinetti Jack Steinberger Roberto Tenchini G Tonelli G Triggiani C Vannini A Venturi P G Verdini J Walsh J M Carter M G Green P V March T Medcalf I S Quazi J A Strong R M Thomas L R West T Wildish David R Botterill R W Clifft T R Edgecock M Edwards S M Fisher T J Jones P R Norton D P Salmon J C Thompson B Bloch-devaux P Colas C Klopfenstein E Locci Sotirios S Loucatos E Monnier P Pérez J A Perlas F Perrier J Rander J F Renardy A Roussarie J P Schuller J Schwindling B Vallage John Gavin Ashman C N Booth C M Buttar R E Carney S L Cartwright F Combley M Dinsdale M Dogru F Hatfield J Martín D Parker P Reeves L F Thompson E Bach E Barbiero S Brandt H Burkhardt G Gillesen Claus Grupen G Heitner H Meinhard L Mirabito U Schäfer H C J Seywerd C Stupperich H Trier V Zeuner G Giannini B Gobbo F Ragusa Luigi Rolandi U Stiegler L Bellantoni D Cinabro J S Conway D F Cowen Z Feng D P S Ferguson Y S Gao J Grahl J L Harton J E Jacobsen R C Jared R P Johnson B W Leclaire J R Pater Y Saadi V Sharma Z H Shi Y H Tang A M Walsh J A Wear F V Weber M H Whitney Wu Sau Lan G Zobernig

subject

Quantum chromodynamics Physics Nuclear and High Energy Physics Range (particle radiation)Particle physics E+E ANNIHILATION PP COLLISIONS Distribution (number theory)Electron–positron annihilation QUARK Hadron PETRA ENERGIES Resonance (particle physics)Charged particle Nuclear physics MONTE-CARLO High Energy Physics::Experiment FRAGMENTATION Scaling Particle Physics - Experiment

description

The charged particle multiplicity distribution of hadronic Z decays was measured on the peak of the Z resonance using the ALEPH detector at LEP. Using a model independent unfolding procedure the distribution was found to have a mean = 20.85 +/- 0.24 and a dispersion D = 6.34 +/- 0.12. Comparison with lower energy data supports the KNO scaling hypothesis in the energy range square-root s = 29-91.25 GeV. At square-root s = 91.25 GeV the shape of the multiplicity distribution is well described by a log-normal distribution, as predicted from a cascading model for multi-particle production. The same model also successfully describes the energy dependence of the mean and width of the multiplicity distribution. A next-to-leading order QCD prediction in the frame-work of the modified leading-log approximation and local parton-hadron duality is found to fit the energy dependence of the mean but not the width of the charged multiplicity distribution, indicating that the width of the multiplicity distribution is a sensitive probe for higher order QCD or non-perturbative effects.

year	journal	country	edition	language
1991-01-01

10.1016/0370-2693(91)90575-b http://hdl.handle.net/11589/4265