Measurement of the Lambda(b) cross section and the anti-Lambda(b) to Lambda(b) ratio with Lambda(b) to J/Psi Lambda decays in pp collisions at sqrt(s) = 7 TeV

S. Chatrchyan; M. Besancon; S. Choudhury; M. Dejardin; D. Denegri; B. Fabbro; J.L. Faure; F. Ferri; S. Ganjour; A. Givernaud; P. Gras; G. Hamel de Monchenault; P. Jarry; E. Locci; J. Malcles; L. Millischer; A. Nayak; J. Rander; A. Rosowsky; I. Shreyber; M. Titov; S. Baffioni; F. Beaudette; L. Benhabib; L. Bianchini; M. Bluj; C. Broutin; P. Busson; C. Charlot; N. Daci; T. Dahms; L. Dobrzynski; R. Granier de Cassagnac; M. Haguenauer; P. Mine; C. Mironov; C. Ochando; P. Paganini; D. Sabes; R. Salerno; Y. Sirois; C. Veelken; A. Zabi; J.-L. Agram; J. Andrea; D. Bloch; D. Bodin; J.-M. Brom; M. Cardaci; E.C. Chabert; C. Collard; E. Conte; F. Drouhin; C. Ferro; J.-C. Fontaine; D. Gele; U. Goerlach; P. Juillot; M. Karim; A.-C. Le Bihan; P. Van Hove; F. Fassi; D. Mercier; S. Beauceron; N. Beaupere; O. Bondu; G. Boudoul; H. Brun; J. Chasserat; R. Chierici; D. Contardo; P. Depasse; H. El Mamouni; J. Fay; S. Gascon; M. Gouzevitch; B. Ille; T. Kurca; M. Lethuillier; L. Mirabito; S. Perries; V. Sordini; S. Tosi; Y. Tschudi; P. Verdier; S. Viret

HAL : in2p3-00694341, version 1

arXiv : 1205.0594

DOI : 10.1016/j.physletb.2012.05.063

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Measurement of the Lambda(b) cross section and the anti-Lambda(b) to Lambda(b) ratio with Lambda(b) to J/Psi Lambda decays in pp collisions at sqrt(s) = 7 TeV
Chatrchyan S., Besancon M., Choudhury S., Dejardin M., Denegri D. et al
Physics Letters B 714 (2012) 136-157 - http://hal.in2p3.fr/in2p3-00694341

Thème(s) :

Physique/Physique des Hautes Energies - Expérience

Titre :

Measurement of the Lambda(b) cross section and the anti-Lambda(b) to Lambda(b) ratio with Lambda(b) to J/Psi Lambda decays in pp collisions at sqrt(s) = 7 TeV

Auteur :

S. Chatrchyan, M. Besancon¹, S. Choudhury¹, M. Dejardin¹, D. Denegri¹, B. Fabbro¹, J.L. Faure¹, F. Ferri¹, S. Ganjour¹, A. Givernaud¹, P. Gras¹, G. Hamel de Monchenault¹, P. Jarry¹, E. Locci¹, J. Malcles¹, L. Millischer¹, A. Nayak¹, J. Rander¹, A. Rosowsky¹, I. Shreyber¹, M. Titov¹, S. Baffioni², F. Beaudette², L. Benhabib², L. Bianchini², M. Bluj², C. Broutin², P. Busson², C. Charlot², N. Daci², T. Dahms², L. Dobrzynski², R. Granier de Cassagnac², M. Haguenauer², P. Mine², C. Mironov², C. Ochando², P. Paganini², D. Sabes², R. Salerno², Y. Sirois², C. Veelken², A. Zabi², J.-L. Agram³, J. Andrea³, D. Bloch³, D. Bodin³, J.-M. Brom³, M. Cardaci³, E.C. Chabert³, C. Collard³, E. Conte³, F. Drouhin³, C. Ferro³, J.-C. Fontaine³, D. Gele³, U. Goerlach³, P. Juillot³, M. Karim³, A.-C. Le Bihan³, P. Van Hove³, F. Fassi⁴, D. Mercier⁴, S. Beauceron⁵, N. Beaupere⁵, O. Bondu⁵, G. Boudoul⁵, H. Brun⁵, J. Chasserat⁵, R. Chierici⁵, D. Contardo⁵, P. Depasse⁵, H. El Mamouni⁵, J. Fay⁵, S. Gascon⁵, M. Gouzevitch⁵, B. Ille⁵, T. Kurca⁵, M. Lethuillier⁵, L. Mirabito⁵, S. Perries⁵, V. Sordini⁵, S. Tosi⁵, Y. Tschudi⁵, P. Verdier⁵, S. Viret⁵

Laboratoire :

1 :	IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA)

CEA : DSM/IRFU

France

2 :	LLR - Laboratoire Leprince-Ringuet

http://polywww.in2p3.fr/

CNRS : UMR7638 – IN2P3 – Polytechnique - X

Route de Saclay - 91128 Palaiseau Cedex

France

3 :	DRS-IPHC - Département Recherches Subatomiques

CNRS : UMR7178 – IN2P3 – Université de Strasbourg

23 rue du Loess - BP28 67037 Strasbourg cedex 2

France

4 :	CC IN2P3 - Centre de Calcul de l'inst. national de phy. nucléaire et de phy. des particules

http://cc.in2p3.fr/

CNRS : USR6402 – IN2P3

12-14, boulevard Niels Bohr 69622 VILLEURBANNE CEDEX

France

5 :	IPNL - Institut de Physique Nucléaire de Lyon

http://www.ipnl.in2p3.fr/

CNRS : UMR5822 – IN2P3 – Université Claude Bernard - Lyon I

France

Résumé :

The Lambda(b) differential production cross section and the cross-section ratio for anti-Lambda(b)/Lambda(b) production are measured as functions of transverse momentum pt(Lambda(b)) and rapidity y(Lambda(b)) in pp collisions at sqrt(s) = 7 TeV using data collected by the CMS experiment at the LHC. The measurements are based on Lambda(b) decays reconstructed in the exclusive final state J/Psi Lambda, with the subsequent decays J/Psi to an opposite sign muon pair and Lambda to proton pion, using a data sample corresponding to an integrated luminosity of 1.9 inverse femtobarns. The product of the cross section times the branching ratio for Lambda(b) to J/Psi Lambda versus pt(Lambda(b)) falls faster than that of b mesons. The measured value of the cross section times the branching ratio for pt(Lambda(b)) > 10 GeV and abs(y(Lambda(b))) < 2.0 is 1.02 +/- 0.06 +/- 0.12 nb, and the integrated cross section ratio for anti-Lambda(b)/Lambda(b) is 1.02 +/- 0.07 +/- 0.09, where the uncertainties are statistical and systematic, respectively.

Collaboration/Projet :

CMS

Type de publication :

Articles dans des revues avec comité de lecture

Date de publication
ou d'écriture :

2012

Nom du périodique :

Physics Letters B (Phys. Lett. B)
Publisher	Elsevier
ISSN	0370-2693

Volume :

714

Page/Article :

136-157

Commentaire :

See paper for full list of authors - Submitted to Physics Letters B

Lien vers le texte intégral :

http://fr.arXiv.org/abs/1205.0594


in2p3-00694341, version 1
http://hal.in2p3.fr/in2p3-00694341
oai:hal.in2p3.fr:in2p3-00694341
Contributeur : Dominique Girod <>
Soumis le : Vendredi 4 Mai 2012, 10:04:24
Dernière modification le : Vendredi 15 Mars 2013, 10:05:21