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Introduction to  s and mixing WG meeting

b s and mixing meeting, March 12 th 2009. Introduction to  s and mixing WG meeting. Olivier Leroy. News. Moriond: no new Bs->JpsiPhi results from Tevatron Depsite ~10fb -1 on tape ! The road map (draft9=LHCB-ROADMAP3-001) was sent to EB on Feb 12

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Introduction to  s and mixing WG meeting

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  1. bs and mixing meeting, March 12th 2009 Introduction to s and mixing WG meeting Olivier Leroy

  2. News • Moriond: no new Bs->JpsiPhi results from Tevatron • Depsite ~10fb-1 on tape ! • The road map (draft9=LHCB-ROADMAP3-001) was sent to EB on Feb 12 • Lively and constructive discussion on CDS (17 comments): • http://cdsweb.cern.ch/record/1161566 • We are finalizing the answers and preparing the next draft • Everyone welcome to participate • Before sending new comments, please read: • The road map • Comments/answers already available • All the supporting notes: they contain much more details than the road map itself Introduction to the beta_s and mixing WG meeting, March 12th 2009

  3. Still to be done • Long pending list of tasks here: • https://twiki.cern.ch/twiki/bin/view/LHCb/BetasManpower • In particular: • Background • Systematics due to background • Toy MC with non-flat angular background • Size of side-band needed to not be systematically dominated • Related to stripping (Greig, Marta) • Include min. bias additional background (K/pi decays in flight) • Selection optimization criteria • Minimizing (stat+syst) uncertainty on betas in practice • No simple mathematical formula to maximize available yet: many compromises • Alternative selection with lifetime biased cut allowed • Beta_s sensitivity with low integrated luminosity (Basem) • Point estimate not reliable with low integrated luminosity (as CDF observed) • Need to construct confidence region to quote first results • Understanding proper time / angular acceptance shapes (Yuehong, Basem) • Same side tagging • Simplified analysis with first data: • One angle analysis (acceptance of the 2 other angles?) • Untagged analysis • S-wave (Yuehong, Concezio, …) • Pure CP-even mode studies (Liming) • ... Introduction to the beta_s and mixing WG meeting, March 12th 2009

  4. Supporting notes for the road map • Submitted to EB: • G. Lanfranchi et al. “Lifetime Unbiased Selection of Bs->J/Psi Phi and relatedcontrol channels: Bd->J/Psi K* and B+->J/Psi K+” • T. du Pree et al. “Methods for Angular Analyses of B->J/psiX”  • Draft1 circulating within CP WG: • M. Calvi et al. “Flavour tagging calibration of \BsJphi\, \BdJKst\ and \BuJK\ channels” • C. Langenbruch et al. “Fit Bs->JpsiPhi” • C. Linn et al. “Time and angular analysis of Bd->JpsiK*” • C. Gobel, M. Calvi et al. “sin2beta” • G. Conti, A. Hicheur, “Trigger preselection of B->JpsiX channels” • Not yet ready: • S. Vecchi et al., “Systematics error on proper time and backgroundfractions” • A. Hicheur et al., “Jpsi(ee)Phi offline + trigger sel” • Y. Xie et al., “KK S-wave” • Note on Dms and Same side kaon ? no draft, no schedule ? Introduction to the beta_s and mixing WG meeting, March 12th 2009

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