Ckm03 workshop
Sponsored Links
This presentation is the property of its rightful owner.
1 / 18

CKM03 workshop PowerPoint PPT Presentation


  • 82 Views
  • Uploaded on
  • Presentation posted in: General

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

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.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


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

  • 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


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’)


VV list of modes


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


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


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


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


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


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?


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


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!!!


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


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


Summary of Charm decays


a in 2-3 body

“ the only hope is not to observe p0p0 and r0p0 “


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


Miscellanea

  • Tau polarization in Btln probes new physics

  • Forward –backwards asymmetry in Kll, Xsll,mll spectrum … all measurements that should be done!


  • Login