Results and prospects for Y(5S) running at B -factories 19 th Hadron - - PowerPoint PPT Presentation

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• A. Drutskoy,

University of Cincinnati

Results and prospects for Y(5S) running at B-factories

May 27-31, 2008, Galena, Illinois.

19th HCP Symposium, Results and prospects for 5S running at B-factories, May 27-31, 2008, Galena, IL A. Drutskoy

19th Hadron Collider Physics Symposium

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19th HCP Symposium, Results and prospects for 5S running at B-factories, May 27-31, 2008, Galena, IL A. Drutskoy

• PRL 54, 381 (1985)

ϒ ϒ ϒ ϒ5S

ϒ ϒ ϒ ϒ(4S) ϒ ϒ ϒ ϒ(6S) e+ e- B B

_

e+ e- !

bb (cc,ss,uu,dd)

+

• e+ e- ->Y(4S) -> BB, B B+ B0

e+ e- -> Y(5S) -> BB, B*B, B*B*, BBπ π π π, BBππ ππ ππ ππ, BsBs, Bs*Bs, Bs*Bs*

• B* -> B γ

γ γ γ ! Bs* -> Bs γ γ γ γ

ϒ ϒ ϒ ϒ(4S)

M(Y(5S)) = 10865 ± ± ± ± 8 MeV/c2 (PDG) Γ Γ Γ Γ(Y(5S)) = 110 ± ± ± ± 13 MeV/c2 (PDG)

_ _ _ _ _ _ _ _ _

2M(Bs)

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19th HCP Symposium, Results and prospects for 5S running at B-factories, May 27-31, 2008, Galena, IL A. Drutskoy

Electron and positron beam energies were increased by 2.7% (same Lorentz boost βγ βγ βγ βγ = 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).

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• e+ source

cavity Belle detector

3.5 GeV e+ 8 GeV e- E(e+): 3.500 GeV -> 3.595 GeV, E(e-) : 7.996 GeV -> 8.211 GeV. 1985: CESR (CLEO,CUSB) ~ 0.1 fb-1 2003: CESR (CLEO III) ~ 0.42 fb-1 2005: KEKB, Belle ~1.86 fb-1 2006: KEKB, Belle ~21.7 fb-1

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19th HCP Symposium, Results and prospects for 5S running at B-factories, May 27-31, 2008, Galena, IL A. Drutskoy

Belle + BaBar > 1 ab-1

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Belle (21 May 08) All: ~ 831 fb-1 , Cont: ~ 68 fb-1 , Y(5S): ~24 fb-1

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19th HCP Symposium, Results and prospects for 5S running at B-factories, May 27-31, 2008, Galena, IL A. Drutskoy

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19th HCP Symposium, Results and prospects for 5S running at B-factories, May 27-31, 2008, Galena, IL A. Drutskoy

hadronic events at Υ Υ Υ Υ(5S) u,d,s,c continuum bb events Bs* Bs Bs Bs Bs* Bs* channel Bs events b continuum Υ( Υ( Υ( Υ(5S) events

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• PRL 54, 381 (1985)

ϒ

B0, B+ events N( () = N(!, 5S) - N(udsc, 5S)

fs = N(Bs

(*) Bs (*)) / N(bb)

f(Bs*Bs*)

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19th HCP Symposium, Results and prospects for 5S running at B-factories, May 27-31, 2008, Galena, IL A. Drutskoy

()L

L L LB

Y(5S) Ds-> φ φ φ φ π π π π+

3775 ± 100 ev

# *= !=2 !,' Bf (Y(5S) -> Ds X) 2 = (23.6 ± 1.2 ± 3.6) %

=>

points:5S hist: cont

D0 -> K- π π π π+ Ds-> φ φ φ φ π π π π+

points:5S hist: cont

P/Pmax<0.5

fs = N(Bs

(*) Bs (*) ) / N(bb)

Bf (Y(5S) -> D0 X) 2 = (53.8 ± 2.0 ± 3.4) %

= (18.0 ± 1.3 ± 3.2 )%

L L L L = 1.86 fb-1

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σ σ σ σ(Y(5S)->bb) = (0.302 ± 0.015) 1B2C?D

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1B2C?D

• A. Drutskoy et al. (Belle Coll.) PRL 98, 052001 (2007).

19th HCP Symposium, Results and prospects for 5S running at B-factories, May 27-31, 2008, Galena, IL A. Drutskoy

*)!3( !)

BsBs , Bs*Bs , Bs*Bs*

?# ' Bs -> Ds- π π π π+ Ds- -> φ φ φ φ π π π π- .

Mbc = E*beam

2 – P*B 2 ,

* BsBs, Bs* Bs !Bs* Bs* !

e+ e- -> Y(5S) -> BsBs, Bs*Bs, Bs*Bs*, Bs* -> Bs γ γ γ γ

Mbc vs ∆ ∆ ∆ ∆E

∆ ∆ ∆ ∆E = E*B – E*beam

Bs *) (E*B) ! (P*B) !+ γ

γ γ γ Bs*

6(!'

MC

Zoom

Mbc vs ∆ ∆ ∆ ∆E

?E ? 1γ γ γ γ

• BELLE

19th HCP Symposium, Results and prospects for 5S running at B-factories, May 27-31, 2008, Galena, IL A. Drutskoy

Bs -> Ds

+ π

π π π- Bs -> Ds*+ π π π π- Bs -> Ds

(*)+ ρ

ρ ρ ρ- Bs -> J/ψ ψ ψ ψ φ/η φ/η φ/η φ/η

7 evnts in Bs* Bs* 3 evnts in Bs* Bs* 9 evnts in Bs* Bs* 4 evnts in Bs* Bs*

N(Bs*Bs*) / N(Bs

(*)Bs (*)) = (93 ± 7 9 ± 1)%

!! Bs* Bs* ! ( Bs*Bs ! BsBs +*

5.408<MBC<5.429GeV/c2

Bs* Bs*

Nev=20.3 ± 4.8

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3()L

L L LB

M(Bs*) = 5418 ± 1 ± 3 MeV/c2 M(Bs) = 5370 ± 1 ± 3 MeV/c2 F 7 0 !)φγ φγ φγ φγ+γγ γγ γγ γγ+:G: !=

E= E

• A. Drutskoy et al. (Belle Coll.)+PRD 76, 012002 (2007).

19th HCP Symposium, Results and prospects for 5S running at B-factories, May 27-31, 2008, Galena, IL A. Drutskoy

5 !

hadronic events at Y(5S)

Bs events

bb continuum included f(Bs*Bs*) = (93 ± 7

9 ± 1)%

Bs* Bs* channel

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~105 Bs

fs = (19.5 ± 3.0 )% F%& !) ,; ; !

σ σ σ σ+E=10869) = (0.302±0.014)nb % &'(&)

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19th HCP Symposium, Results and prospects for 5S running at B-factories, May 27-31, 2008, Galena, IL A. Drutskoy

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19th HCP Symposium, Results and prospects for 5S running at B-factories, May 27-31, 2008, Galena, IL A. Drutskoy

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19th HCP Symposium, Results and prospects for 5S running at B-factories, May 27-31, 2008, Galena, IL A. Drutskoy

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• 19th HCP Symposium,

Results and prospects for 5S running at B-factories, May 27-31, 2008, Galena, IL A. Drutskoy

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• 19th HCP Symposium,

Results and prospects for 5S running at B-factories, May 27-31, 2008, Galena, IL A. Drutskoy

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• 19th HCP Symposium,

Results and prospects for 5S running at B-factories, May 27-31, 2008, Galena, IL A. Drutskoy

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• 19th HCP Symposium,

Results and prospects for 5S running at B-factories, May 27-31, 2008, Galena, IL A. Drutskoy

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19th HCP Symposium, Results and prospects for 5S running at B-factories, May 27-31, 2008, Galena, IL A. Drutskoy

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19th HCP Symposium, Results and prospects for 5S running at B-factories, May 27-31, 2008, Galena, IL A. Drutskoy

) Bs 3* *

3* * !

µ µ µ µ+ ∆ ∆ ∆ ∆z = βγ βγ βγ βγc ∆ ∆ ∆ ∆t µ µ µ µ+ Beam profile

Z beam ~ 3 mm; Ybeam ~ 5 µ µ µ µm.

Y(5S) Bs Bs

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µ µ µ

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• 19th HCP Symposium,

Results and prospects for 5S running at B-factories, May 27-31, 2008, Galena, IL A. Drutskoy

∆Γ ∆Γ ∆Γ ∆Γs = ∆Γ ∆Γ ∆Γ ∆Γs

CP cos φ

φ φ φs ∆Γ ∆Γ ∆Γ ∆Γs

SM = ∆Γ

∆Γ ∆Γ ∆Γs

CP = 2 | Γ

Γ Γ Γ12|

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π π π 2) =)Bs -> Ds

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BF’s ~(1-3)% +* ∆Γ ∆Γ ∆Γ ∆Γs/Γ Γ Γ Γs . ∆Γ ∆Γ ∆Γ ∆Γs

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Σ Σ Σ Γ

Γ Γ Γ(CP=+) – Σ

Σ Σ Σ Γ

Γ Γ Γ(CP= –)

∆Γ ∆Γ ∆Γ ∆Γs/Γ Γ Γ Γs Bf (Bs -> Ds+(*) Ds

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19th HCP Symposium, Results and prospects for 5S running at B-factories, May 27-31, 2008, Galena, IL A. Drutskoy

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ψ φ ψ φ ψ φ %%22

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• 19th HCP Symposium,

Results and prospects for 5S running at B-factories, May 27-31, 2008, Galena, IL A. Drutskoy

• PRL 54, 381 (1985)

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F* $- '-%.

M(Λ Λ Λ Λb)x2 = (11248 ± 18) MeV/c2 => 6.3 % ,#?1. M(Λ Λ Λ Λb) = (5624 ± 9) MeV/c2

#)#?*)*!>

M(Bc) = (6286 ± 5) MeV/c2

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19th HCP Symposium, Results and prospects for 5S running at B-factories, May 27-31, 2008, Galena, IL A. Drutskoy

Conclusions

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Bs studies at e+ e- colliders running at Y(5S) have some advantages comparing with hadron-hadron colliders. These colliders are in some sense complementary. We are discussing possibility to increase Belle dataset at Y(5S) to ~100 fb-1 in 2009. Many Bs decays with branching fractions down to 10-6 can be measured with statistics of ~100 fb-1. Dataset of 1000 fb-1 can be taken just after Super Belle upgrade. Important SM tests can be done with statistics of the order of 1 ab-1. It is important to have more flexibility in beam energies at Super B factories.

• 19th HCP Symposium,

Results and prospects for 5S running at B-factories, May 27-31, 2008, Galena, IL A. Drutskoy

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Background slides

19th HCP Symposium, Results and prospects for 5S running at B-factories, May 27-31, 2008, Galena, IL A. Drutskoy

µ / KL detector Central drift chamber He(50%)+C2H6(50%) EM calorimeter (CsI(Tl)) Cherenkov detector n=1.015~1.030 Si vertex detector TOF counter SC solenoid 1.5T

Belle Detector Belle Detector

8GeV e− 3.5GeV e+

Impact Parameter resolution

r-φ direction z direction

Calculated by TRACKERR

Occupancy effects. Degradation of intrinsic resolution is included. Efficiency loss is NOT included

Beampipe radius is important Competitive performance as the current SVD

sinθ 1.4

0.02 0.01

[cm]

0.03

[cm]

T.Kawasaki, Atami BNM2008 Jan 2008

20µ µ µ µm

dz

dz resolutoin SuperB SVD3mod SVD3

For π 0.2GeV 0.5GeV 1.0GeV 2.0GeV

dz resolution

dz resolutoin

SuperB SVD3mod SVD3

For π 0.2GeV 0.5GeV 1.0GeV 2.0GeV

dz

T.Kawasaki, Atami BNM2008 Jan 2008

20µ µ µ µm

∆Γ ∆Γ ∆Γ ∆Γs/Γ Γ Γ Γs

MBs = (MH + ML)/ 2 Γ Γ Γ Γs = (Γ Γ Γ ΓH + Γ Γ Γ ΓL)/ 2

i i i i

d d t ( ) Bs Bs

= ( M – / 2 Γ Γ Γ Γ )

i i i i

( )

Bs Bs

• !* @

?? !L !!+8 %3%

9 *#6: M11 = M22 Γ Γ Γ Γ11 = Γ Γ Γ Γ22

| BH,L(t) > = exp( - ( i i i i MH,L+Γ Γ Γ ΓH,L/ 2)t ) | BH,L> BSM : : : : φ φ φ φs = arg (- M12/ Γ Γ Γ Γ12) 2θ θ θ θs = φ φ φ φs ∆Γ ∆Γ ∆Γ ∆Γs = 2 | Γ Γ Γ Γ12| cos 2θ θ θ θs

SM: β β β βs=arg(-Vts Vtb*/ Vcs/ Vcb*) =O(λ

λ λ λ2) - #( 3*

∆ ∆ ∆ ∆ms = MH – ML ∆Γ ∆Γ ∆Γ ∆Γ = Γ Γ Γ ΓL- Γ Γ Γ ΓH >0 in SM

“

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