1 / 18

CKM03 workshop

CKM03 workshop. What I learnt R. Faccini. A. Datta D. London hep-ph/0303159. Beta. D. London, N.&R. Sinha hep-ph/0207007. Lots of importance is given to VV modes

jin
Download Presentation

CKM03 workshop

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. CKM03 workshop What I learnt R. Faccini

  2. A. Datta D. London hep-ph/0303159 Beta D. London, N.&R. Sinha hep-ph/0207007 • Lots of importance is given to VV modes • Angular analysis could reveal new physics because there are T-odd coefficients (triple products v1xv2•v3) which are supposed to be present in absence of two phases with different weak phases • Separately for charged and neutral modes • Separately for B and B • This method allows to test and bound possible other diagrams; • New physics • Penguins/tree • Note: these methods are in addition to CPV in oscillation and direct CPV

  3. VV modes (cont’d) • How : • for flavour eigenstates it is just a reparametrization of current analysis • For CP eigenstates time-dep analysis with 18 parameters • Which modes? • General criteria: to expect 0 TP in SM one needs to have all amplitudes with the same phase. This cannot happen if a meson is made of more combinations of quarks (e.g. r). In this case the problem is solved taking higher resonances (r’)

  4. VV list of modes

  5. Ways to cos2b • Angular analysis in J/Y K* returns sin(d)cos(2b) • Fleisher suggests to use the sign of the strong phase from factorization • deFazio showed factorization does not hold in charmonium decays (cc0K) which means the argument from Fleisher does not hold • Kayser method (J/YK0 vs J/YK0) is still theoretically the best but it is not applicable • DDK seems to be the only possibility T.E.Browder et al., Phys.Rev.D61:054009,2000

  6. s u d c c d b b b c d s g in charmless decays • Contributions from bu transitions bring a dependence of CPV from g • Measure g directly in direct CP asymmetries & B+ decay rates • Measure 2b+g with CPV in mixing • Two cases A1~l2c A2~l4c d sin2b+g: A2 doubly cabibbo suppressed D(*)- p+ u b u B0 B0 p+ D(*)- No theo hypothesis whatever d d A1~l3c A2~l3c sing: A2 colour suppressed K(*)+ D(*)0 u c B= D(*)0 B0 u u K(*)+ u u

  7. u b sin2b+g in D(*)p • we do not know • We are currently using • But: • What is the error on this SU(3) symmetry? BaBar is currently quoting 30% … although form factors have only 10% • What are the possible contributions from annihilations? Br(DsK) seems to say A~0.1 Emissions • We might be better off quoting dl/l=14% s,d Ds+,D+ c BF (B0 D- p+) fDs2 p- B0 BF (B0 Ds+ p-)  l2Dp d d tan2qC fD2

  8. London,Sinha Phys.Rev.Lett.85:1807(2000) sin2b+g in D*r • The 18 parameters fit has been discussed as a mean also to observe new physics (5000 fully reco in current data sample) • Idea! Use the measured |l|(L=1) in D*r to estimate |l|(D*p) • On 100 fb-1dsin2b+g~0.35

  9. Gronau,London Phys Lett B253, 483 (1991) DK : GLW • Measure B-D0K, B-D0K and B-D0CPK • In 100fb-1: • N(B-D0CPK)~25 (per eigenstate) • but how to get B-D0K ? Should investigate lepton D0 decays. Expect 14 events … basically impossible • Currently backing up to use R,d,g unknown

  10. D.Atwood,Dunietz,A. Soni hep-ph 9612433 DK: ADS • Find B-[f]K- and B+[f]K+ where f is a mode where the Br(D0f)<<Br(D0f) • Relevant parameter • For instance in 100 fb-1 • N([K+p-,K3p,Kpp0]K(*)-)~30 • Q~0.5 (expected asymmetry) • More modes can be added • Backgrounds?

  11. D. Atwood, A. Soni hep-ph/0206045 D0K0 • Do the time dependent analysis both for D0 in CP eigenstates or not • With the BF measured by Belle in D0Ks • N(Kp)~30 x 2 (D*0) • N(Ksp0)~3 • Very important: Kl modes are also very useful (add independent constraints) • N(Kp)~25 BUT A LOT OF BACKGROUND • Can we just do the direct CPV if non-CP eigenstates? No, don’t learn anything

  12. D. Atwood, A. Soni, hep-ph/0304085 DK inclusive approaches • Both ADS and D0K0 can be done with inclusive approaches • B-[K+X]K-(p0 for D*0) N~800 Q~0.3 (!!! But what about bkgd?How to associate K+ to D0? Lepton tag -> down to 50 events) looks really tough!!! • B0[KsX]KsN~100 but it will be hard to make Dt measurements • B0 [K+X]KsN~600 • If we do not want to go for partial reco, X can be a list of modes (semi-exclusive approach) • It all looks very tough!!!

  13. Soffer,Zupan hep-ph/0303187 D(dalitz)K- • A subsample of the previous class is the use of D dalitz plot. If one parametrizes the whole dalitz structure (from inclusive D) one can fit for sing. • Proposed mode f=Kspp • In 100 fb-1 we should have ~300 events

  14. DKp • Direct CP in B- D0K-p0 • Measures g • Oscillations in B0 D0Ksp- • Measures sin(2b+g) • Advantages • Two amplitudes of same size • Disadvantages • Need to make sure there are interference regions • Need to know dalitz structure

  15. Summary of Charm decays

  16. a in 2-3 body “ the only hope is not to observe p0p0 and r0p0 “

  17. bdg: an idea • bdg is a measurement that people would really like • One idea: • Consider the recoil (300K in 100fb-1) • Select events with a photon consistent with bsgand a Ks (N0) or a charged K (Nc) and estimate the pure b sg yield (and therefore BF) from • Use the sample without kaons to estimate bdg properly subtracting bsg background • To reject Kl one should try ascribing to each Kl (or only those”more likely to be Kl”) the mass of the Kl and see if the consistency with a B decays increases

  18. Miscellanea • Tau polarization in Btln probes new physics • Forward –backwards asymmetry in Kll, Xsll,mll spectrum … all measurements that should be done!

More Related