Measurement of the parity-violating asymmetry parameter alpha_b and the helicity amplitudes for the decay Lambda_b->J/psi+Lambda with the ATLAS detector

G. Aad; S. Albrand; J. Brown; B. Clement; J. Collot; S. Crépé-Renaudin; B. Dechenaux; P.A. Delsart; C. Gabaldon; M.H. Genest; J.Y. Hostachy; B.T. Le; F. Ledroit-Guillon; A. Lleres; A. Lucotte; F. Malek; C. Monini; J. Stark; B. Trocmé; M. Wu; G. Rahal; Z. Barnovska; N. Berger; M. Delmastro; L. Di Ciaccio; T.K.O. Doan; S. Elles; C. Goy; T. Hryn'Ova; S. Jézéquel; H. Keoshkerian; R. Lafaye; J. Leveque; V.P. Lombardo; N. Massol; H. Przysiezniak; G. Sauvage; E. Sauvan; M. Schwoerer; T. Todorov; I. Wingerter-Seez; R. Zitoun; S. Abdel Khalek; E. Augé; A. Bassalat; C. Becot; S. Binet; C. Bourdarios; D. Charfeddine; C. de La Taille; J.B. de Vivie de Regie; L. Duflot; M. Escalier; L. Fayard; D. Fournier; J.-F. Grivaz; T. Guillemin; S. Henrot-Versillé; J. Hrivnac; L. Iconomidou-Fayard; J. Idarraga; M. Kado; A. Lounis; N. Makovec; P. Matricon; L. Poggioli; P. Puzo; A. Renaud; D. Rousseau; G. Rybkin; A.C. Schaffer; E. Scifo; L. Serin; S. Simion; R. Tanaka; H.L. Tran; D. Zerwas; Zhiqing Zhang; L. Alio; M. Barbero; C. Bertella; J. C. Clémens; Y. Coadou; F. Djama; L. Feligioni; D. Hoffmann; F. Hubaut; E. B. F. G. Knoops; E. Le Guirriec; B. Li; D. Madaffari; K. Mochizuki; E. Monnier; S. Muanza; Y. Nagai; P. Pralavorio; A. Rozanov; T. Serre; M. Talby; N. Tannoury; E. Tiouchichine; S. Tisserant; J. Toth; F. Touchard; M. Ughetto; L. Vacavant; D. Boumediene; Emmanuel Busato; D. Calvet; S. Calvet; J. Donini; E. Dubreuil; N. Ghodbane; G. Gilles; Ph. Gris; C. Guicheney; H. Liao; D. Pallin; Daniela Paredes Hernández; F. Podlyski; C. Santoni; Timothée Theveneaux-Pelzer; Loïc Valery; F. Vazeille; I. Koletsou; O. Simard

doi:10.1103/PhysRevD.89.092009

Journal articles

Measurement of the parity-violating asymmetry parameter alpha_b and the helicity amplitudes for the decay Lambda_b->J/psi+Lambda with the ATLAS detector

G. Aad ¹ S. Albrand ² J. Brown ² B. Clement ² J. Collot ² S. Crépé-Renaudin ² B. Dechenaux ² P.A. Delsart ² C. Gabaldon ² M.H. Genest ² J.Y. Hostachy ² B.T. Le ² F. Ledroit-Guillon ² A. Lleres ² A. Lucotte ² F. Malek ² C. Monini ² J. Stark ² B. Trocmé ² M. Wu ² G. Rahal ³ Z. Barnovska ⁴ N. Berger ⁴ M. Delmastro ⁴ L. Di Ciaccio ⁴ T.K.O. Doan ⁴ S. Elles ⁴ C. Goy ⁴ T. Hryn'Ova ⁴ S. Jézéquel ⁴ H. Keoshkerian ⁴ R. Lafaye ⁴ J. Leveque ⁴ V.P. Lombardo ⁴ N. Massol ⁴ H. Przysiezniak ⁴ G. Sauvage ⁴ E. Sauvan ⁴ M. Schwoerer ⁴ T. Todorov ⁴ I. Wingerter-Seez ⁴ R. Zitoun ⁴ S. Abdel Khalek ⁵ E. Augé ⁵ A. Bassalat ⁵ C. Becot ⁵ S. Binet ⁵ C. Bourdarios ⁵ D. Charfeddine ⁵ C. de La Taille ⁵ J.B. de Vivie de Regie ⁵ L. Duflot ⁵ M. Escalier ⁵ L. Fayard ⁵ D. Fournier ⁵ J.-F. Grivaz ⁵ T. Guillemin ⁵ S. Henrot-Versillé ⁵ J. Hrivnac ⁵ L. Iconomidou-Fayard ⁵ J. Idarraga ⁵ M. Kado ⁵ A. Lounis ⁵ N. Makovec ⁵ P. Matricon ⁵ L. Poggioli ⁵ P. Puzo ⁵ A. Renaud ⁵ D. Rousseau ⁵ G. Rybkin ⁵ A.C. Schaffer ⁵ E. Scifo ⁵ L. Serin ⁵ S. Simion ⁵ R. Tanaka ⁵ H.L. Tran ⁵ D. Zerwas ⁵ Zhiqing Zhang ⁵ L. Alio ¹ M. Barbero ¹ C. Bertella ¹ J. C. Clémens ¹ Y. Coadou ¹ F. Djama ¹ L. Feligioni ¹ D. Hoffmann ¹ F. Hubaut ¹ E. B. F. G. Knoops ¹ E. Le Guirriec ¹ B. Li ¹ D. Madaffari ¹ K. Mochizuki ¹ E. Monnier ¹ S. Muanza ¹ Y. Nagai ¹ P. Pralavorio ¹ A. Rozanov ¹ T. Serre ¹ M. Talby ¹ N. Tannoury ¹ E. Tiouchichine ¹ S. Tisserant ¹ J. Toth ¹ F. Touchard ¹ M. Ughetto ¹ L. Vacavant ¹ D. Boumediene ⁶ Emmanuel Busato ⁶ D. Calvet ⁶ S. Calvet ⁶ J. Donini ⁶ E. Dubreuil ⁶ N. Ghodbane ⁶ G. Gilles ⁶ Ph. Gris ⁶ C. Guicheney ⁶ H. Liao ⁶ D. Pallin ⁶ Daniela Paredes Hernández ⁶ F. Podlyski ⁶ C. Santoni ⁶ Timothée Theveneaux-Pelzer ⁶ Loïc Valery ⁶ F. Vazeille ⁶ I. Koletsou ⁴ O. Simard ⁴

1 CPPM - Centre de Physique des Particules de Marseille

2 LPSC - Laboratoire de Physique Subatomique et de Cosmologie

3 CC-IN2P3 - Centre de Calcul de l'IN2P3

4 LAPP - Laboratoire d'Annecy de Physique des Particules

5 LAL - Laboratoire de l'Accélérateur Linéaire

6 LPC - Laboratoire de Physique Corpusculaire - Clermont-Ferrand

Abstract : A measurement of the parity-violating decay asymmetry parameter, alpha_b, and the helicity amplitudes for the decay Lambda_b->J/psi(mu mu)+Lambda(p pi) is reported. The analysis is based on 1400 Lambda_b and anti-Lambda_b baryons selected in 4.6/fb of proton-proton collision data with a center-of-mass energy of 7 TeV recorded by the ATLAS experiment at the LHC. By combining the Lambda_b and anti-Lambda_b samples under the assumption of CP conservation, the value of alpha_b is measured to be 0.30+/-0.16(stat)+/-0.06(syst). This measurement provides a test of theoretical models based on perturbative QCD or heavy-quark effective theory.

Document type :

Journal articles

Domain :

Physics [physics] / High Energy Physics - Experiment [hep-ex]

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http://hal.in2p3.fr/in2p3-00973190
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Submitted on : Friday, April 4, 2014 - 8:31:35 AM
Last modification on : Sunday, June 26, 2022 - 12:01:09 PM

Measurement of the parity-violating asymmetry parameter alpha_b and the helicity amplitudes for the decay Lambda_b->J/psi+Lambda with the ATLAS detector

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Measurement of the parity-violating asymmetry parameter alpha_b and the helicity amplitudes for the decay Lambda_b->J/psi+Lambda with the ATLAS detector

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