001366075 001__ 1366075
001366075 005__ 20180611151352.0
001366075 0248_ $$aoai:cds.cern.ch:1366075$$pcerncds:lhcb-conf$$pcerncds:FULLTEXT
001366075 035__ $$9Inspire$$a1258237
001366075 037__ $$aLHCb-CONF-2011-035
001366075 041__ $$aeng
001366075 088__ $$aCERN-LHCb-CONF-2011-035
001366075 110__ $$aThe LHCb Collaboration
001366075 245__ $$aAnalysis of $\bar{B}^0_s\to J/\psi \left(\pi^+\pi^-~{\rm and~}K^+K^-\right)$ and the first observation of $J/\psi f'_2(1525)$
001366075 260__ $$c2011
001366075 269__ $$aGeneva$$bCERN$$c08 Jul 2011
001366075 270__ [email protected]
001366075 300__ $$a18 p
001366075 500__ $$aLHCb-ANA-2011-049
001366075 520__ $$aMeasurement of mixing induced CP violation in $\bar{B}^0_s$ decays is of prime importance in probing new physics. So far only the channel $\bar{B}^0_s \to J/\psi\phi$ has been used. Here we investigate $\bar{B}^0_s $ decays into CP eigenstates and other modes in the $J/\psi \pi^+\pi^-$ and $J/\psi K^+ K^-$ final states. The $\pi^+\pi^-$mass spectrum has a relatively narrow structure peaking near 980 MeV first found by LHCb, that we identify as the $f_0(980)$, and show that it is consistent with being pure S-wave. Thus, this is a CP-odd eigenstate. The ratio of rates for $J/\psi f_0(980)$ to $J/\psi \phi$, with $f_0(980)\to\pi^+\pi^-$ in a $\pm$90 MeV mass window around the $f_0(980)$ and $\phi\to K^+K^-$ is $R^{f_0}_{\rm effective}=(21.7\pm1.1\pm$0.7)%. Other structures at higher mass are shown to contain D-wave. The $K^+K^-$ spectrum besides a large $\phi$ component has significant $f'_2(1525)$. The ratio of rates for $J/\psi f'_2(1525)$ to $J/\psi \phi$, with $f'_2(1525)\to K^+K^-$ in a $\pm$125 MeV mass window around the $f'_2(1525)$ is $R^{f'_2}_{\rm effective}=(19.4\pm1.8\pm1.1$)%. These new channels may be useful for different aspects of CP violation measurements.
001366075 540__ $$3Preprint$$aCC-BY-4.0
001366075 595__ $$aCERN EDS
001366075 65017 $$2SzGeCERN$$aParticle Physics - Experiment
001366075 65027 $$2SzGeCERN$$aPHYS
001366075 6531_ $$9CERN$$aflavour physics
001366075 6531_ $$9CERN$$aB physics
001366075 6531_ $$9CERN$$aCP violation
001366075 690C_ $$aCERN
001366075 690C_ $$aINTNOTE
001366075 690C_ $$aPUBLLHCB
001366075 690C_ $$aINTNOTELHCBCONFPUBL
001366075 693__ $$aCERN LHC$$eLHCb
001366075 710__ $$5PH-EP$$gLHCb Collaboration
001366075 7870_ $$iSuperseded by$$rLHCB-PAPER-2011-026$$w1409178
001366075 859__ [email protected]
001366075 8564_ $$uhttp://cds.cern.ch/record/1366075/files/LHCb-CONF-2011-035.pdf
001366075 8564_ $$uhttp://cds.cern.ch/record/1366075/files/Figs-CONF-2011-035.zip
001366075 903__ $$spublic
001366075 916__ $$sn$$w201230
001366075 962__ $$b1233501$$ngrenoble20110721
001366075 963__ $$aPUBLIC
001366075 970__ $$a000715607CER
001366075 980__ $$aINTNOTELHCBCONFPUBL
001366075 980__ $$aNOTE
001366075 980__ $$aConferencePaper