Z production cross sections and lepton pair forward-backward asymmetries

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RESEARCH PRODUCT

Z production cross sections and lepton pair forward-backward asymmetries

D Buskulic David William Casper I De Bonis D Décamp P Ghez C Goy J P Lees M N Minard P Odier B Pietrzyk F Ariztizabal P Comas J M Crespo I Efthymiopoulos E Fernández M Fernández-bosman V Gaitan L Garrido M Martínez T S Mattison S Orteu A Pacheco C Padilla A Pascual D Creanza M De Palma A Farilla G Iaselli G Maggi N Marinelli S Natali S Nuzzo A Ranieri G Raso F Romano F Ruggieri G Selvaggi L Silvestris P Tempesta G Zito Y Chai D Huang X Huang J Lin T Wang Y Xie D Xu R Xu J Zhang L Zhang W Zhao G Bonvicini J Boudreau H Drevermann Roger W Forty G Ganis C Gay M Girone R Hagelberg J Harvey J M Hilgart R Jacobsen B Jost J Knobloch I Lehraus M Maggi C Markou P Mato H Meinhard Adolf G Minten R Miquel K Moffeit P Palazzi J R Pater J A Perlas P Perrodo J F Pusztaszeri F Ranjard L Rolandi J E Rothberg T Ruan M Saich W D Schlatter M Schmelling F Sefkow W Tejessy I R Tomalin R Veenhof H W Wachsmuth S R Wasserbaech W Wiedenmann T Wildish W Witzeling J Wotschack Ziad J Ajaltouni M Bardadin-otwinowska A Barrès C Boyer A Falvard P Gay C Guicheney P Henrard J Jousset B Michel J C Montret D Pallin P Perret F Podlyski J Proriol F Saadi T Fearnley J B Hansen J D Hansen J R Hansen P H Hansen S D Johnson R Møllerud B S Nilsson A Kyriakis E Simopoulou I Siotis Anna Vayaki K Zachariadou J Badier A Blondel G R Bonneaud J C Brient P Bourdon G Fouque L Passalacqua A Rougé M Rumpf R Tanaka M Verderi H L Videau D J Candlin M I Parsons E Veitch E Focardi L Moneta G Parrini M Corden M C Delfino C H Georgiopoulos D E Jaffe D A Levinthal A Antonelli G Bencivenni G Bologna F Bossi P Campana G Capon F Cerutti V Chiarella G Felici P Laurelli G Mannocchi F Murtas G P Murtas M Pepé-altarelli S Salomone P Colrain I Ten Have I G Knowles J G Lynch W J Maitland W T Morton C Raine P Reeves J M Scarr K Smith M G Smith A S Thompson S Thorn R M Turnbull U Becker O Braun C Geweniger P Hanke V Hepp E E Kluge A Putzer B Rensch M Schmidt H Stenzel K Tittel M Wunsch R Beuselinck D M Binnie W Cameron M Cattaneo D J Colling P J Dornan J F Hassard N P Konstantinidis A Moutoussi J Nash D G Payne G San Martin J K Sedgbeer A G Wright P Girtler D Kuhn G Rudolph R K Vogl C K Bowdery T J Brodbeck A J Finch F Foster G Hughes D Jackson N R Keemer M Nuttall A D Patel T Sloan S W Snow E P Whelan A Galla A M Greene K Kleinknecht J Raab B Renk H G Sander H Schmidt S M Walther R Wanke B Wolf A M Bencheikh C Benchouk A Bonissent D Calvet J Carr P Coyle C A Diaconu F Etienne D Nicod P Payre L Roos D Rousseau P Schwemling M Talby S Adlung R W Assmann C Bauer Walter Blum D Brown P W Cattaneo B Dehning H Dietl F Dydak M Frank A W Halley K Jakobs J Lauber G Lütjens G Lutz W Männer H G Moser R H Richter J Schröder A S Schwarz R Settles H C J Seywerd U Stierlin U Stiegler R Saint-denis G Wolf R Alemany J Boucrot O Callot A Cordier M Davier L Duflot J F Grivaz P Heusse P Janot D W Kim F R Le Diberder J Lefrançois A M Lutz G Musolino M H Schune J J Veillet I Videau D Abbaneo G Bagliesi G Batignani U Bottigli C Bozzi G Calderini M Carpinelli M A Ciocci V Ciulli R Dell'orso I Ferrante F Fidecaro L Foà F Forti A Giassi M A Giorgi A Gregorio F Ligabue A Lusiani P S Marrocchesi E B Martin A Messineo Fabrizio Palla G Rizzo G Sanguinetti P Spagnolo J Steinberger R Tenchini G Tonelli G Triggiani A Valassi C Vannini A Venturi P G Verdini J Walsh A P Betteridge Y Gao M G Green D L Johnson P V March T Medcalf L M Mir I S Quazi J A Strong V Bertin D R Botterill R W Clifft T R Edgecock S Haywood M Edwards P R Norton J C Thompson B Bloch-devaux P Colas H Duarte S Emery W Kozanecki E Lançon M C Lemaire E Locci B Marx P Pérez J Rander J F Renardy A Rosowsky A Roussarie J P Schuller J Schwindling D Si Mohand B Vallage R P Johnson A M Litke G Taylor J Wear W Babbage A Beddall C N Booth S L Cartwright F Combley I Dawson C Rankin L F Thompson A Böhrer S Brandt G D Cowan E Feigl C Grupen G Lutters J A Minguet-rodríguez F Rivera P Saraiva U Schäfer L Smolik L Bosisio R Della Marina G Giannini B Gobbo L Pitis F Ragusa L Bellantoni W Chen J S Conway Z Feng D P S Ferguson Y S Gao J Grahl J L Harton O J Hayes H Hu J M Nachtman Pan Yi Bin Y Saadi M Schmitt I Scott V Sharma J Turk A M Walsh F V Weber Wu Sau Lan X Wu M Zheng J M Yamartino G Zobernig

subject

Physics Aleph Particle physics Luminosity (scattering theory)Physics and Astronomy (miscellaneous)010308 nuclear & particles physics Electron–positron annihilation Physics High Energy Physics::Phenomenology Weinberg angle 01 natural sciences Nuclear physics ALEPH Experiment 0103 physical sciences [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]High Energy Physics::Experiment Neutrino 010306 general physics Engineering (miscellaneous)ALEPH experiment Particle Physics - Experiment Lepton Bhabha scattering

description

Precise values of the Z resonance cross sections and lepton pair forward-backward asymmetries are measured from a sample of 1.3 million Z decays into hadrons and charged leptons taken with the ALEPH detector at LEP. A silicon-tungsten luminosity calorimeter was installed in ALEPH in 1992, permitting the determination of the absolute luminosity to a systematic precision of 0.15% (experimental) and 0.25% (theoretical). This is combined with a better understanding of the hadronic event selection and an improved tau pair selection. Including the ALEPH results of the past three years one obtains sigma(h)0 = (41.60 +/- 0.16) nb, and R(l) = 20.69 +/- 0.09. The corresponding number of light neutrino species is N(v) = 2.983 +/- 0.034. The lepton pair forward-backward' asymmetry is used to derive the ratio of vector to axial-vector couplings of leptons: g(V)2(M(Z)2)/g(A)2(M(Z)2) = 0.0058 +/- 0.0011. An application of these results to constrain one model with extra Z bosons is presented.

year	journal	country	edition	language
1994-01-01

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