1. Bs physics at Y(5S) in Belle experiment
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A. Drutskoy
University of Cincinnati
Bs physics at Y(5S) in Belle experiment
SLAC Experimental Seminar
January 17, 2006, SLAC.
Bs physics at Y(5S), SLAC seminar, Jan 17, 2006, A. Drutskoy
A.Drutskoy, 32 Int'l Conference on HEP, August 16-22, 2004

2. Bs physics at Y(5S), SLAC seminar, Jan 17, 2006, A. Drutskoy
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Outline
Introduction.
Data taking.
Number of bb events at Y(5S) dataset.
Inclusive production of J/Y, D0 and Ds at Y(5S).
Exclusive decays Bs-> J/Y f (/h) and Bs-> Ds+(*) p- (/r-).
Search for rare Bs decays.
Bs physics at Y(5S), SLAC seminar, Jan 17, 2006, A. Drutskoy
A.Drutskoy, 32 Int'l Conference on HEP, August 16-22, 2004

3. Bs physics at Y(5S), SLAC seminar, Jan 17, 2006, A. Drutskoy
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Introduction
CLEO
PRL 54, 381 (1985)
(5S)
Asymmetric energy e+e- colliders
(B Factories) running at Y(4S) :
Belle and BaBar
1985: CESR (CLEO,CUSB) ~116 pb-1 at Y(5S)
2003: CESR (CLEO III) ~0.42 fb-1 at Y(5S) _
e+ e- ->Y(4S) -> BB, where B is B+ or B0 meson _ _ _ _ _ _ _ _
e+ e- -> Y(5S) -> BB, B*B, B*B*, BBp, BBpp, BsBs, Bs*Bs, Bs*Bs*
where B* -> B g and Bs* -> Bs g _ _ _
B0 = s b , B0 = s b s s
Bs physics at Y(5S), SLAC seminar, Jan 17, 2006, A. Drutskoy
A.Drutskoy, 32 Int'l Conference on HEP, August 16-22, 2004

4. Masses, widths, lifetimes, CM momenta
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Masses, widths, lifetimes, CM momenta
Particle
Mass,
MeV/c2
Width,
DM,
ct, mm
Pcm(BB),
MeV/c
Y(4S)
 3.5
20  2  4
Y(5S)
10865  8
110  13 B+
 0.5
502
1282 B0
 0.5
462
1281 B*
 0.6
45.8  0.4
1075 Bs
 1.3
438
851
Bs*
 3.5
51  4
415
Bs physics at Y(5S), SLAC seminar, Jan 17, 2006, A. Drutskoy
A.Drutskoy, 32 Int'l Conference on HEP, August 16-22, 2004

5. Bs physics at Y(5S), SLAC seminar, Jan 17, 2006, A. Drutskoy
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Electron and positron
beam energies have to
be increased by 2.7%
(same Lorentz boost
bg = 0.425) to move
from Y(4S) to Y(5S).
No modifications are
required for Belle
detector, trigger system
or software to move
from Y(4S) to Y(5S).
Bs physics at Y(5S), SLAC seminar, Jan 17, 2006, A. Drutskoy
A.Drutskoy, 32 Int'l Conference on HEP, August 16-22, 2004

6. Engineering run at Y(5S)
3 days of engineering run at Y(5S) : June 21 – June 23.
Plan for 3 day engineering runs:
1. Energy scan: five points with ~30 pb-1 at each point:
10825, , 10865, and MeV.
2. Data taking at Y(5S) peak; to collect integral lumi ~2 fb-1 .
Results:
Y(5S) peak position ECM=10869 MeV was chosen from energy scan.
Integrated luminosity of ~1.86 fb-1 (ECL lumi) was taken !!!
Maximum luminosity ~13.9 /nb/sec, almost 100% of Y(4S) specific
luminosity (taking into account smaller currents). Belle can take
1 fb-1 per day at Y(5S) or even more.
Very smooth running, all goals are reached.
Bs physics at Y(5S), SLAC seminar, Jan 17, 2006, A. Drutskoy

7. Bs physics at Y(5S), SLAC seminar, Jan 17, 2006, A. Drutskoy

8. Hadronic event classification hadronic events at U(5S)
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Hadronic event classification
hadronic events at U(5S)
U(5S) events
u,d,s,c continuum
b continuum
bb events
CLEO
PRL 54, 381 (1985)
(5S)
Bs events
B0, B+ events
Bs* Bs* channel
Bs* Bs
Bs Bs
Bs physics at Y(5S), SLAC seminar, Jan 17, 2006, A. Drutskoy
A.Drutskoy, 32 Int'l Conference on HEP, August 16-22, 2004

9. Bs physics at Y(5S), SLAC seminar, Jan 17, 2006, A. Drutskoy
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Number of Bs in dataset
To calculate any exclusive branching fraction we must know
the full number of Bs* Bs* events.
To calculate any inclusive branching fraction we must know
the full number of Bs mesons.
To obtain the full number of initial Bs* Bs* events in our data sample
we should go through steps:
1. Obtain the number of hadronic events in Y(5S) dataset.
2. Subtract u,d,s,c continuum using continuum data below Y(4S) with
luminosity scale factor.
3. Calculate the ratio N(Bs(*)Bs(*)) / N(bb) using inclusive Ds and D0
spectra.
4. Calculate the ratio N(Bs*Bs*)/ N(Bs(*)Bs(*)) using reconstructed
exclusive events.
Bs physics at Y(5S), SLAC seminar, Jan 17, 2006, A. Drutskoy
A.Drutskoy, 32 Int'l Conference on HEP, August 16-22, 2004

10. Bs physics at Y(5S), SLAC seminar, Jan 17, 2006, A. Drutskoy
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Number of bb events.
Ncont(5S) = Ncont(E=10.519)* L(5S) / L(cont) * (Econt/E5S)2 (e5S/ econt)
Y(5S) :
Lumi = ± (stat) fb-1
Cont :
Lumi = ± (stat) fb-1
s ~ 1/Ecm 2
(1.857/3.67)*( /10.869)2 = ±
e5S/ econt = ± 0.003
Nbb(5S) =
561,000 ± 3,000 ± 29,000
R = s(hadrons) / s(mm)
Nbb(5S) / fb-1 = 302,000 ±15,000
CLEO : fb-1 Nbb(5S)/ fb-1 = 310,000 ± 52,000
Bs physics at Y(5S), SLAC seminar, Jan 17, 2006, A. Drutskoy
A.Drutskoy, 32 Int'l Conference on HEP, August 16-22, 2004

11. Luminosity ratio L (5S) / L (continuum).
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Luminosity ratio L (5S) / L (continuum).
We obtained luminosity ratio:
L (5S) / L (cont) = ±
Luminosity ratio can be checked using the ratio of normalized momentum
distributions of fastest charged track, fastest K0 and D0 mesons.
Using MC simulation CLEO obtained (0.6 ± 1.1)% correction for new channels opening.
That correction was applied to these numbers.
0.471 ± 0.005
0.471 ± 0.005
0.477 ± 0.005
=> Good agreement within errors with energy corrected luminosity ratio.
Bs physics at Y(5S), SLAC seminar, Jan 17, 2006, A. Drutskoy
A.Drutskoy, 32 Int'l Conference on HEP, August 16-22, 2004

12. Bs physics at Y(5S), SLAC seminar, Jan 17, 2006, A. Drutskoy
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Inclusive analyses : selections
Particle ID:
p/K : standard ID(K/p)
J/Y -> m+ m- :
Standard Muon ID
D0 -> K+ p- : no cuts
Ds -> fp:
| M(f) – M(K+K-) | < 12 MeV/c2 ~3s
|cos(qheli) (Ds)| > 0.25 for fp+
No continuum suppression cuts.
Ratio of Bs(*) Bs(*) pair number to all bb pair number
fs = N(Bs(*) Bs(*)) / N(bb) can be obtained from:
Bf (Y(5S) -> Ds X) / 2 = fs Bf (Bs -> Ds X) + (1- fs) Bf (B -> Ds X) x x
Bs physics at Y(5S), SLAC seminar, Jan 17, 2006, A. Drutskoy
A.Drutskoy, 32 Int'l Conference on HEP, August 16-22, 2004

13. Bs physics at Y(5S), SLAC seminar, Jan 17, 2006, A. Drutskoy
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Inclusive analysis : Y(5S) -> Ds X
Theory :
hep- ex/ CLEO
Y(5S)
P/Pmax< 1
Bf (Bs -> Ds X) = (92 ± 11) %
PDG :
Bf (Ds-> f p+)=(3.6 ± 0.9)%
Babar :
Bf(Ds-> f p+)=(4.8 ± 0.6)%
Ds-> f p+
Sum: Bf(Ds-> f p+) = (4.4 ± 0.5)%
3775 ± 100 ev
CLEO :
Bf (B -> Ds X) = ( 9.0 ± 0.3 ±1.4 )%
Babar :
Bf (B -> Ds X) = ( 8.94 ± 0.16 ± 1.12 )%
After continuum subtraction and efficiency correction:
Bf (Y(5S) -> Ds X) 2 = (22.6 ± 1.2 ± 2.8) %
CLEO measured: Bf (Y(5S) -> Ds X) / 2 = (22.35 ± 2.1 ± 4.95)%
=>
fs = (16.4 ± 1.4 ± 4.1 )%
Syst. err. dominates by Bf(Ds->fp+)
Using Ds mesons CLEO measured fs = (16.0 ± 2.6 ± 5.8 )%
Bs physics at Y(5S), SLAC seminar, Jan 17, 2006, A. Drutskoy
A.Drutskoy, 32 Int'l Conference on HEP, August 16-22, 2004

14. Bs physics at Y(5S), SLAC seminar, Jan 17, 2006, A. Drutskoy
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Inclusive analysis : Y(5S) -> D0 X
Theory :
hep- ex/ CLEO
Y(5S)
Bf (Bs -> D0 X) = (8 ± 7) %
PDG:
D0 -> K- p+
Bf (B -> D0 X) = (63.7 ± 3.0) %
55009 ± 510 ev
Bf (D0 -> K- p+) = (3.81 ± 0.09 ) %
P/Pmax< 1
After continuum subtraction and efficiency correction:
Bf (Y(5S) -> D0 X) 2 = (53.3 ± 2.0 ± 2.9) %
Then we obtain ratio fs = N(Bs(*) Bs(*)) / N(bb) :
fs = (18.7 ± 3.6 ± 6.7 )%
Syst. error dominates by N(bb).
Using Ds mesons CLEO measured fs = (16.0 ± 2.6 ± 5.8 )%
Bs physics at Y(5S), SLAC seminar, Jan 17, 2006, A. Drutskoy
A.Drutskoy, 32 Int'l Conference on HEP, August 16-22, 2004

15. Bs physics at Y(5S), SLAC seminar, Jan 17, 2006, A. Drutskoy
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Inclusive analysis : Y(5S) -> J/Y X
Theory :
Bf(Bs-> J/Y X)
P/Pmax<0.5
Y(5S)
= 1.00 ± 0.10
Bf(B -> J/Y X)
446±28 ev
m+m-
PDG:
Bf (B -> J/Y X) = (1.094 ± 0.032) %
Bf (J/Y -> m+ m- ) = (5.88 ± 0.10 ) %
After continuum subtraction and efficiency correction:
Bf (Y(5S) -> J/Y X) 2 = (1.068 ± ± 0.057) %
Good agreement with expectations => bb number is correct
Assuming approximately 17% Bs(*)Bs(*) production over bb :
Bf ( Bs -> J/Y X) = ( 0.94 ± 0.51 ± 0.37 ) %
Bs physics at Y(5S), SLAC seminar, Jan 17, 2006, A. Drutskoy
A.Drutskoy, 32 Int'l Conference on HEP, August 16-22, 2004

16. Exclusive analysis: signature of fully reconstructed Bs decays
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Exclusive analysis: signature of fully reconstructed Bs decays
BsBs , Bs*Bs , Bs*Bs*
Mbc vs DE
Mbc = E*beam2 – P*B2
e+ e- -> Y(5S) -> BB, B*B, B*B*, BsBs, Bs*Bs, Bs*Bs*
where B* -> B g and Bs* -> Bs g
Detailed MC event simulation and reconstruction with Belle detector was
performed. Figures are shown for decay mode Bs -> Ds- p+ with Ds- -> f p- .
Bs signal can be well separated for BsBs, Bs*Bs and Bs* Bs* final states.
Bs physics at Y(5S), SLAC seminar, Jan 17, 2006, A. Drutskoy
A.Drutskoy, 32 Int'l Conference on HEP, August 16-22, 2004

17. Exclusive analyses: selections
Particle ID:
K/p: standard ID(K/p) ; standard lepton ID
Masses:
p0 –> gg s
KS –> p+ p- 3s
K*0 –> K+ p-
h –> gg s
r+ –> p+ p0 , P(g) >150 MeV/c
f – > K+K s
– 30 < M(m+m-) – M(J/y) < 30 MeV/c s
– 100 < M(e+e-) – M(J/y) < 30 MeV/c2
Ds+ -> fp+ , K*0 K+, Ks K s
Ds*+ -> Ds+ g : M(Dsg)- M(D*s), 2s , P(g)>50 MeV/c
Continuum suppression:
Angle between Bs thrusts: |cosq| < 0.8 for Ds(*)+ p- ; |cosq| < 0.9 for J/Y ;
|cosq| < 0.7 for Ds(*)+ r- ; |cosq| < 0.6 for K*0 K+ modes ;
Fox2<0.3 for Ds(*)+ p-/ r-; Fox2<0.4 for J/y modes
Bs physics at Y(5S), SLAC seminar, Jan 17, 2006, A. Drutskoy

18. Exclusive Bs -> Ds(*)+ p- decays Bs -> Ds+ p- Bs -> Ds*+ p-
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Exclusive Bs -> Ds(*)+ p- decays
Bs -> Ds+ p-
Bs -> Ds*+ p-
BsBs , Bs*Bs , Bs*Bs* MC
9 events in Bs* Bs*
4 events in Bs* Bs*
Ds+ -> f p+ , Ds+ -> K*0 K+, Ds+ -> Ks K+
Clear signal at Bs* Bs* channel ; no signals in Bs* Bs and BsBs channels.
Taking full number of Bs from inclusive analysis:
Bf(Bs -> Ds+ p- ) = (0.65 ± 0.21 ± 0.19)%
CDF measured Bf ratio, taking Bf(B0->D+p-) from PDG: (0.40 ± 0.06 ± 0.13)%
Bs physics at Y(5S), SLAC seminar, Jan 17, 2006, A. Drutskoy
A.Drutskoy, 32 Int'l Conference on HEP, August 16-22, 2004

19. Exclusive Bs -> Ds(*)+ r- and Bs -> J/y f/h decays
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Exclusive Bs -> Ds(*)+ r- and Bs -> J/y f/h decays
Bs -> Ds(*)+ r-
Bs -> J/y f/h
7 events in Bs* Bs*
3 events in Bs* Bs*
Ds+->f p+ ,Ds+->K*0 K+,Ds+->KsK+
Bs -> J/y f,
Bs -> J/y h(gg)
Clear signal at Bs* Bs* channel ; signals in Bs* Bs and BsBs channels are not seen.
Bs* Bs* channel dominance was also observed by CLEO (next slide).
We can combine all shown channels to obtain quantitative Bs(*) parameters.
Bs physics at Y(5S), SLAC seminar, Jan 17, 2006, A. Drutskoy
A.Drutskoy, 32 Int'l Conference on HEP, August 16-22, 2004

20. H. Vogel, CLEO, FPCP 2004 (obsolete), Korea, exclusive Bs decays
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Exclusive Bs Signals at the (5S)
BsJ/' , J/+e+e-
 K+K 
Ebeam – Ecandidate (GeV)
Mbc (Bs candidate) (GeV)
BsDs(*) Ds*Ds
DsK+K0 K+K*0 
Ebeam – Ecandidate (GeV)
Mbc (Bs candidate) (GeV)
Preliminary
Nsignal = 4, Nbkg  0.1
Nsignal = 8, Nbkg  1
(5S) decay to Bs(*)Bs(*) is dominated by the Bs*Bs* mode!
H. Vogel, CLEO, FPCP 2004 (obsolete), Korea, exclusive Bs decays
Bs physics at Y(5S), SLAC seminar, Jan 17, 2006, A. Drutskoy
- 13 -
A.Drutskoy, 32 Int'l Conference on HEP, August 16-22, 2004

21. DE distributions, sum of all Bs decay modes
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DE distributions, sum of all Bs decay modes
5.408< MBC<5.429 GeV/c2
5.384< MBC<5.405GeV/c2
5.36< MBC<5.38GeV/c2
Bs* Bs*
Bs* Bs
Bs Bs
Nev=20.0 ± 4.8
6.7 s
Small signal, Nev= 1.3 ± 2.0 (6± 96)%
Decay U(5S) -> Bs* Bs* , with Bs* -> Bs g.
Potential models predict Bs* Bs*
dominance over Bs*Bs and BsBs
channels, but not so strong.
DE peak = Ecm(accel.)/2 – Ecm(real)/2 – E(g)
DE peak = – 47.6 ± 2.6 MeV
Bs physics at Y(5S), SLAC seminar, Jan 17, 2006, A. Drutskoy
A.Drutskoy, 32 Int'l Conference on HEP, August 16-22, 2004

22. MBC distribution, sum of all Bs decay modes
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MBC distribution, sum of all Bs decay modes
- 0.08<DE< MeV
- 0.08<DE< MeV
Bs* Bs*
Bs* Bs*
Mbc = (E*B+ DEpeak)2 – P*B2
Mbc = E*B2 – P*B2
M (Bs) = 5370 ± 1 ± 3 MeV/c2
Ecm = MeV ; E*B = Ecm/2
M (Bs*) = 5418 ± 1 ± (acc. err) MeV/c2
PDG: M (Bs) = ± 2.4 MeV/c2
CDF: M (Bs) = ± 0.8 MeV/c2
Photon momentum is neglected => does
not change Bs* mass position, only smearing.
Photon energy smearing does not
change Bs mass position
Bs physics at Y(5S), SLAC seminar, Jan 17, 2006, A. Drutskoy
A.Drutskoy, 32 Int'l Conference on HEP, August 16-22, 2004

23. hadronic events at Y(5S)
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Number of Bs in dataset
hadronic events at Y(5S)
Lumi = fb-1
bb continuum included
bb events
N ev = 561,000 ± 3,000 ± 29,000
fs = (16.4 ± 1.4 ± 4.1 )%
Bs events
N ev = 92,000 ± 8,000 ± 23,000
f(Bs*Bs*) = (94 ± 69)%
Bs* Bs* channel
N ev = 86,500 ± 7,500 ± 22,500
Bs physics at Y(5S), SLAC seminar, Jan 17, 2006, A. Drutskoy
A.Drutskoy, 32 Int'l Conference on HEP, August 16-22, 2004

24. Exclusive Bs -> K+ K- and Bs -> f g decays
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Exclusive Bs -> K+ K- and Bs -> f g decays
Bs -> K+ K-
Bs -> f g MC
Fox2 < 0.3,
Fox2 < 0.4,
|cos q| < 0.5
|cos q| < 0.8
K- : tight ID(K/p),
Bgr. ~ 0.15 ev.
Est. sign.~ 0.4 ev.
Bgr. ~ 0.14 ev.
Est. sign.~ 0.7 ev.
Partner of B -> K+ p- penguin decay
Partner of B -> K* g penguin decay
Bs physics at Y(5S), SLAC seminar, Jan 17, 2006, A. Drutskoy
A.Drutskoy, 32 Int'l Conference on HEP, August 16-22, 2004

25. CDF: Bs-> h+ h’- decays
fs Bf( Bs -> K+ K-)
Unbinned likelihood fit.
= 0.50 ± 0.08 ± 0.07
fd Bf( B0 -> K+ p-)
fs Bf( Bs -> K+ p-)
< (90%CL)
fd Bf( B0 -> K+ p-)
Bf( Bs -> p+ p-)
< (90%CL)
Bf( Bs -> K+ K-)
No absolute branching fractions.
Statistical separation of final states.
Bs physics at Y(5S), SLAC seminar, Jan 17, 2006, A. Drutskoy

26. Exclusive Bs -> Ds(*)+ Ds(*)- decays Angle between B thrusts:
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Exclusive Bs -> Ds(*)+ Ds(*)- decays
Bs-> Ds+ Ds-
Bf(Bs->Ds+ Ds- ) < 7.1% at 90% CL
Bs-> Ds*+ Ds-
Bf(Bs->Ds*+ Ds- ) < 12.7% at 90% CL
Bs-> Ds+ Ds*-
Bf(Bs->Ds*+ Ds*- ) < 27.3% at 90% CL
Bs-> Ds*+ Ds*-
Expected (2 fb-1): ~ 0.5 events in each mode.
Expected with 30 fb-1:
Bf (Bs->Ds(*)+ Ds(*)- ) = (12 ± 5 )%
Ds+ -> fp+ , K*0 K+, Ks K+
Fox2 < 0.4
Bs->Ds(*) + Ds(*) - decays are CP- even states
with large BF’s, leading to large DGs/Gs:
Angle between B thrusts:
|cos q| < 0.8
DGs
Bf(Bs->Ds(*) + Ds(*) - )
should be compared with direct
measurement to test SM. ~ ~
<= Gs
1- Bf(Bs->Ds(*) + Ds(*) - ) / 2
Bs physics at Y(5S), SLAC seminar, Jan 17, 2006, A. Drutskoy
A.Drutskoy, 32 Int'l Conference on HEP, August 16-22, 2004

27. Exclusive Bs -> g g decay
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Exclusive Bs -> g g decay
Bs -> g g MC DE
Natural mode to search for BSM
effects, many theoretical papers
devoted to this decay.
In SM: Bf(Bs-> gg ) = ( ) x 10-6
BSM can increase Bf up to two orders MC
Fox2 < 0.5
|cos q| < 0.8
90% CL UL with 1.86 fb-1 :
Bf(Bs -> gg ) < 0.56 x
Better than PDG limit : < 1.48 x 10- 4
Many “conventional” BSM models can be better constrained by B -> K* g and
B->s g g processes, however not all. In some BSM models Bs ->gg provides the best
limit, in particular in 4-generation model (VTs) and R- parity violation SUSY ( x M(gg)).
Bs physics at Y(5S), SLAC seminar, Jan 17, 2006, A. Drutskoy
A.Drutskoy, 32 Int'l Conference on HEP, August 16-22, 2004

28. Bs physics at Y(5S), SLAC seminar, Jan 17, 2006, A. Drutskoy
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Signals with 50 fb-1
Bs -> Ds(*)+ Ds(*) CP eigenstate
Bs -> g g - intrinsic penguin
Bs -> K+ K penguin
Bs -> f g - radiative penguin
Bs -> DsJ p - tree with DsJ
Bs -> Ds+ K Cabibbo suppressed
Bs -> Ds+l - n exclusive leptonic
Bs -> D0 KS color suppressed
Bs lifetime
Bs semileptonic
It seems, very strong physics program can be performed with 50 fb-1:
Bs physics at Y(5S), SLAC seminar, Jan 17, 2006, A. Drutskoy
A.Drutskoy, 32 Int'l Conference on HEP, August 16-22, 2004

29. Bs physics at Y(5S), SLAC seminar, Jan 17, 2006, A. Drutskoy
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Conclusions
Inclusive production branching fractions of J/Y, D0 and Ds mesons are
measured at Y(5S). Ratio of Bs meson production over all bb-events
is measured: fs = (16.4 ± 1.4 ± 4.1 )%
Significant exclusive Bs signals are observed in Y(5S) -> Bs* Bs* channel.
Combining all studied decay modes, mass of Bs* meson was measured:
M(Bs*) = 5418 ± 1 ± (acc. err) MeV/c2, and mass of Bs was measured:
M (Bs) = 5370 ± 1 ± 3 MeV/c2. Obtained Bs mass is in agreement with
recent CDF measurement M (Bs) = ± 0.8 MeV/c2.
Good agreement with published CLEO results is obtained in both
inclusive and exclusive analyses. Our Y(5S) dataset is 4.4 times larger
than CLEO dataset, providing better accuracy.
Rare Bs decays are searched for at Y(5S) for the first time.
Many new interesting results can be obtained with 50 fb-1. Significant
signals are expected in many Bs decays with 50 fb-1 (maybe 30 fb-1)
Engineering runs demonstrated, that background level is not large for
studied decay modes.
Bs physics at Y(5S), SLAC seminar, Jan 17, 2006, A. Drutskoy
A.Drutskoy, 32 Int'l Conference on HEP, August 16-22, 2004

30. Bs physics at Y(5S), SLAC seminar, Jan 17, 2006, A. Drutskoy
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Background slides
Bs physics at Y(5S), SLAC seminar, Jan 17, 2006, A. Drutskoy
A.Drutskoy, 32 Int'l Conference on HEP, August 16-22, 2004

31. CDF: Bs-> Ds-p+ decays
Results with 119 pb-1 :
fs Bf( Bs -> Ds- p+)
= 0.35 ± 0.05 ± 0.04 ± 0.09
fd Bf( B0 -> D- p+)
From PDG : fs / fd = 0.270±0.028 ,
fs is rate of “b quark” -> Bs
Uncertainty of absolute branching
fraction measurement dominates
already by 10% uncertainty of fs/fd.
Bf( Bs -> Ds- p+)
= 1.4 ± 0.2(stat) ± 0.2(syst) ± 0.4(BF) ± 0.2(PR)
Bf( B0 -> D- p+)
Bs physics at Y(5S), SLAC seminar, Jan 17, 2006, A. Drutskoy