1. Charmless B-decays at BaBar
Matt Graham
July 7, 2008
SLAC Annual Program Review

2. SLAC Annual Program Review
Why Charmless?
huge variety of physics can be found in charmless decays
can extract all three UT angles
potential New Physics can be seen in penguin transitions
large range of BFs for these “rare” decays
BFs and CP asymmetries are important inputs
for theoretical models (e.g. PQCD, SCET,
factorization etc…) b g a h r
J/yK0, fK0
pp, rp, rr
DK, Kp
July 7, 2008
SLAC Annual Program Review

3. SLAC Participation in the Charmless World
Convenerships:
Charmless 2-body: A. Roodman (2007-Present)
Charmless 3-body: M. Graham (2004-Present), D. Dujmic ( )
Analysis:
h+p0/p0p0: AR, M. Allen, I. Ofte
K+K-K0/ KsKsK+: AR, DD, J. Thompson, H. Kim, B. Lindquist
K+p-p0: AR, MG, A. Wagner
Ksp+p-: MG
Ksp0p0: AR, MA
p+p-p0/r+r-: MG
ppbarh: T. Hrynova
LLh: MG, B. Butler
July 7, 2008
SLAC Annual Program Review

4. sin2b From Penguin Decays
J/y f = K0 K0
QCDFA
penguin dominated b(qqbar)s decays have
the same weak phase as b (ccbar)s and thus
the TD-CPV parameters should be S=hsin2b and C=0 in the SM
other SM diagrams contribute a small shift and is expected to increase S
S-hsin2b
2-body: [Beneke; PL B620, 143 (2005)]
3-body: [Cheng,Chua,Soni; PRD72, (2005)]
July 7, 2008
SLAC Annual Program Review

5. Measuring b: B0K+K-K0 Dalitz Plot Analysis
383M B-Pairs
Measuring b: B0K+K-K0 Dalitz Plot Analysis
we perform a time-dependent Dalitz plot
amplitude analysis: includes f(1020), f0(980), “fX(1500)”, cc0, and a non-resonant component
interference between CP-Odd and CP-Even terms allows us to extract beff f
beff=(18.9 ± 4.6 ± 1.7)o
mirror solution disfavored
@ 4.5s
fx(1500)
cc0
AR, DD, JT
PRL 99, ,2007
July 7, 2008
SLAC Annual Program Review

6. Measuring b: B0p+p-KS Dalitz Plot Analysis
383M B-Pairs
Measuring b: B0p+p-KS Dalitz Plot Analysis
another TD-DP amplitude analysis; more going on here…
includes r(770), f0(980), f2(1270), “fX(1300)”, and a non-resonant component
additionally, there are self-tagging modes: K*(892), K*0(1430)
f0(980) r0
f2(1270)/fX(1300)
beff(f0(980)Ks)=(44.3 ± 11.5)o
beff(r(770)Ks)=(18.7 ± 10.0)o
r(770)
f0(980) MG
hep-ex/
July 7, 2008
SLAC Annual Program Review

7. Status of sin2b from Penguins
Naïve average of S now in excellent
agreement with SM….
BUT: most of the measurements
are still below the SM…the very
small errors on K+K-Ks and f0Ks
help to pull the average up.
July 7, 2008
SLAC Annual Program Review

8. Measuring a: The Isospin Analysis
A+0=A-0
A00
A+- 2
2Da
8-fold ambiguity
from -180o 180o
4 ways to
fold the triangles
A+-=A(B0p+p-)
A00=A(B0p0p0)
A+0=A(B+p+p0)
A-0=A(B-p-p0)
BF, S, C
BF, Acp
July 7, 2008
SLAC Annual Program Review

9. SLAC Annual Program Review
383M B-Pairs
Measuring a: Bp0p0
crucial mode for pp isospin analysis
can’t extract S, but can get C!
154 ± 27 Events
BF(p0p0)=(1.5  0.28)x10-6
C(p0p0)=-0.490.35
without C(p0p0), the peaks here
are completely unresolved!
AR, MA
PRD 76, , 2007.
July 7, 2008
SLAC Annual Program Review

10. SLAC Annual Program Review
Status of a
SLAC has also been involved
in the analysis of B0r+r- and
B0rp (both MG)…
Combining all results,
we have:
a=87.5 ± 5.8 at 1s
*** this doesn’t include
newest p0p0 result!!!
July 7, 2008
SLAC Annual Program Review

11. Measuring g: B0Kpp Dalitz Plots
Can use an isospin decomposition in the Kp system to extract g
Need the relative phases between the different Kp isospin states…interference!
can’t use the 2-body states (K+p-, K0p0)
must use 3-body decaysDalitz plots
Need phases between:
(K*+p-, K*0p0)
(K*-p+, K*0p0)
(K*+p-, K*-p+)
B0 K+p-p0
B0 Ksp+p-
Ciuchini et al.,
PRD 74, , 2006
July 7, 2008
SLAC Annual Program Review

12. Measuring g: B0 p+p-Ks Dalitz Plot
383M B-Pairs
Measuring g: B0 p+p-Ks Dalitz Plot
K*(892)
Same analysis as the f0(980)Ks and r(770)Ks TD-CPV results!
Sensitivity to Df(K*+p-, K*-p+) comes (mainly) from common interference between K* and r(770) and NR
K*(1430)
Df(K*+p-, K*-p+) =(164±31)o
mirror solution disfavored
@ 3.7s significance
Scan in Df MG
hep-ex/0708:2097
July 7, 2008
SLAC Annual Program Review

13. Measuring g: B0p-p0K+ Dalitz Plot
225M B-Pairs
Measuring g: B0p-p0K+ Dalitz Plot
Spin-off of the p+p-p0 DP analysis
Tricky! Poorer resolution than Ksp+p- due to p0; more going on in the DP than in p+p-p0
Current result just published recently on Runs 1-4 by the Paris group; we are working on an update
K*(892)
K*(1430)
No significant
constraint on the
phases…should
do better with full
dataset
Paris/MG,AW
hep-ex/0711:4417
July 7, 2008
SLAC Annual Program Review

14. SLAC Annual Program Review
Future Plans
Complete the KKK Dalitz plot picture with full dataset:
update of K+K-Ks time-dependent DP analysis is almost done
plan on doing DP analysis of K+K-K+ (update) and KsKsK+ (for the first time
Use full dataset to extract g in B0Kpp
update of B0K+p-p0 is almost complete
plan to update B0Ksp+p- for next summer
investigate using K*0(1430)p system to extract g
Use full dataset to extract a in B0p+p-p0
work has begun; plan to have result for next summer
July 7, 2008
SLAC Annual Program Review

15. SLAC Annual Program Review
Summary
This is an interesting and challenging time to be doing physics analysis on BaBar
Since we won’t have more data, the results we make public from now on are likely the final word from BaBar
Our goal is give as complete and coherent picture as possible…and extract as much information as we can!
Our physics goals center around understanding the KKK and ppK Dalitz plot composition and use that knowledge to measure beff and g
July 7, 2008
SLAC Annual Program Review