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CKM03 workshop

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CKM03 workshop

What I learnt

R. Faccini

A. Datta D. London hep-ph/0303159

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

- 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’)

- 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

- Contributions from bu 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

- 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)

- 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)

- 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

- Find B-[f]K- and B+[f]K+ where f is a mode where the Br(D0f)<<Br(D0f)
- 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

- 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

- 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

- 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

- 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

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

- bdg is a measurement that people would really like
- One idea:
- Consider the recoil (300K in 100fb-1)
- Select events with a photon consistent with bsgand 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 bdg properly subtracting bsg 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

- Tau polarization in Btln probes new physics
- Forward –backwards asymmetry in Kll, Xsll,mll spectrum … all measurements that should be done!