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Time-dependent angular analysis of the decay B^0_s → J/ψϕ and extraction of ΔГ_s and the CP-violating weak phase ϕ_s by ATLAS

Aad, G. and Perez, K. (2012) Time-dependent angular analysis of the decay B^0_s → J/ψϕ and extraction of ΔГ_s and the CP-violating weak phase ϕ_s by ATLAS. Journal of High Energy Physics, 2012 (12). Art. No. 072. ISSN 1126-6708. https://resolver.caltech.edu/CaltechAUTHORS:20130221-094945655

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Abstract

A measurement of B^0_s→J/ψϕ decay parameters, including the CP -violating weak phase ϕ_s and the decay width difference ΔΓ_s is reported, using 4.9 fb^(−1) of integrated luminosity collected in 2011 by the ATLAS detector from LHC pp collisions at a centre-of-mass energy s√=7 TeV. The mean decay width Γ_s and the transversity amplitudes |A_0(0)|^2 and |A_∥(0)|^2 are also measured. The values reported for these parameters are: ϕ_s=0.22±0.41 (stat.)±0.10 (syst.) rad ΔΓ_s=0.053±0.021 (stat.)±0.010 (syst.) ps^(−1) Γ_s=0.677±0.007 (stat.)±0.004 (syst.) ps^(−1) |A_0(0)|^2=0.528±0.006 (stat.)±0.009 (syst.)|A_∥(0)|^2=0.220±0.008 (stat.)±0.007 (syst.) where the values quoted for ϕ_s and ΔΓ_s correspond to the solution compatible with the external measurements to which the strong phase δ_⊥ is constrained and where ΔΓ_s is constrained to be positive. The fraction of S-wave KK or f_0 contamination through the decays B^0_s→J/ψK^+K^−(f_0) is measured as well and is found to be consistent with zero. Results for ϕ_s and ΔΓ_s are also presented as 68%, 90% and 95% likelihood contours, which show agreement with Standard Model expectations.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1007/JHEP12(2012)072DOIUNSPECIFIED
http://link.springer.com/article/10.1007/jhep12%282012%29072PublisherUNSPECIFIED
Additional Information:© 2012 CERN, for the benefit of the ATLAS collaboration. Received: August 2, 2012. Revised: November 8, 2012. Accepted: November 23, 2012. Published: December 13, 2012. This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited. We thank CERN for the very successful operation of the LHC, as well as the support staff from our institutions without whom ATLAS could not be operated efficiently. We acknowledge the support of ANPCyT, Argentina; YerPhI, Armenia; ARC, Australia; BMWF, Austria; ANAS, Azerbaijan; SSTC, Belarus; CNPq and FAPESP, Brazil; NSERC, NRC and CFI, Canada; CERN; CONICYT, Chile; CAS, MOST and NSFC, China; COLCIENCIAS, Colombia; MSMT CR, MPO CR and VSC CR, Czech Republic; DNRF, DNSRC and Lundbeck Foundation, Denmark; EPLANET and ERC, European Union; IN2P3-CNRS, CEA-DSM/IRFU, France; GNAS, Georgia; BMBF, DFG, HGF, MPG and AvH Foundation, Germany; GSRT, Greece; ISF, MINERVA, GIF, DIP and Benoziyo Center, Israel; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco; FOM and NWO, Netherlands; RCN, Norway; MNiSW, Poland; GRICES and FCT, Portugal; MERYS (MECTS), Romania; MES of Russia and ROSATOM, Russian Federation; JINR; MSTD, Serbia; MSSR, Slovakia; ARRS and MVZT, Slovenia; DST/NRF, South Africa; MICINN, Spain; SRC and Wallenberg Foundation, Sweden; SER, SNSF and Cantons of Bern and Geneva, Switzerland; NSC, Taiwan; TAEK, Turkey; STFC, the Royal Society and Leverhulme Trust, United Kingdom; DOE and NSF, United States of America. The crucial computing support from all WLCG partners is acknowledged gratefully, in particular from CERN and the ATLAS Tier-1 facilities at TRIUMF (Canada), NDGF (Denmark, Norway, Sweden), CC-IN2P3 (France), KIT/GridKA (Germany), INFN-CNAF (Italy), NL-T1 (Netherlands), PIC (Spain), ASGC (Taiwan), RAL (U.K.) and BNL (U.S.A.) and in the Tier-2 facilities worldwide.
Funders:
Funding AgencyGrant Number
ANPCyT (Argentina)UNSPECIFIED
YerPhl (Armenia)UNSPECIFIED
ARC (Australia)UNSPECIFIED
BMWF (Austria)UNSPECIFIED
ANAS (Azerbaijan)UNSPECIFIED
SSTC (Belarus)UNSPECIFIED
CNPq and FAPESP (Brazil)UNSPECIFIED
NSERC (Canada)UNSPECIFIED
NRC and CFI (Canada)UNSPECIFIED
CERNUNSPECIFIED
CONICYT (Chile)UNSPECIFIED
CASUNSPECIFIED
MOST and NSFC (China)UNSPECIFIED
COLCIENCIAS (Colombia)UNSPECIFIED
MSMT CR (Czech Republic)UNSPECIFIED
MPO CR and VSC CR (Czech Republic)UNSPECIFIED
DNRF (Denmark)UNSPECIFIED
DNSRC and Lundbeck Foundation (Denmark)UNSPECIFIED
EPLANET and ERCUNSPECIFIED
European UnionUNSPECIFIED
IN2P3-CNRS (France)UNSPECIFIED
CEA-DSM/IRFU (France)UNSPECIFIED
GNAS (Georgia)UNSPECIFIED
BMBF (Germany)UNSPECIFIED
DFG (Germany)UNSPECIFIED
HGF (Germany)UNSPECIFIED
MPG and AvH Foundation (Germany)UNSPECIFIED
GSRT (Greece)UNSPECIFIED
ISF (Israel)UNSPECIFIED
MINERVA (Israel)UNSPECIFIED
GIF (Israel)UNSPECIFIED
DIP and Benoziyo Center (Israel)UNSPECIFIED
INFN (Italy)UNSPECIFIED
MEXT and JSPS (Japan)UNSPECIFIED
CNRST (Morocco)UNSPECIFIED
FOM and NWO (The Netherlands)UNSPECIFIED
RCN (Norway)UNSPECIFIED
MNiSW (Poland)UNSPECIFIED
GRICES and FCT (Portugal)UNSPECIFIED
MERYS (MECTS) (Romania)UNSPECIFIED
MES of Russia and ROSATOMUNSPECIFIED
Russian FederationUNSPECIFIED
JINRUNSPECIFIED
MSTD (Serbia)UNSPECIFIED
MSSR (Slovakia)UNSPECIFIED
ARRS and MVZT (Slovenia)UNSPECIFIED
DST/NRF (South Africa)UNSPECIFIED
MICINN (Spain)UNSPECIFIED
SRC and Wallenberg Foundation (Sweden)UNSPECIFIED
SER (Switzerland)UNSPECIFIED
SNSF and Cantons of Bern in Geneva (Switzerland)UNSPECIFIED
NSC (Taiwan)UNSPECIFIED
TAEK (Turkey)UNSPECIFIED
STFC (United Kingdom)UNSPECIFIED
Royal Society and Leverhulme Trust (United Kingdom)UNSPECIFIED
Department of Energy (DOE)UNSPECIFIED
NSFUNSPECIFIED
Subject Keywords:Hadron-Hadron Scattering
Issue or Number:12
Record Number:CaltechAUTHORS:20130221-094945655
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20130221-094945655
Official Citation:Time-dependent angular analysis of the decay B^0_s → J/ψØ and extraction of ΔГ_s and the CP-violating weak phase Ø_s by ATLAS
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:37044
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:21 Feb 2013 18:28
Last Modified:03 Oct 2019 04:44

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