Introduction to s and mixing wg meeting
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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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Introduction to s and mixing wg meeting

bs and mixing meeting, March 12th 2009

Introduction to s and mixing WG meeting

Olivier Leroy


Introduction to s and mixing wg meeting

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


Still to be done

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


Supporting notes for the road map

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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