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Belle results relevant to LHC. S.L. Olsen U of Hawai’i. Pheno-07 May 8, 2007 Madison Wisc. CKM Global Fit (Sep.2006). CKM is “correct” at tree level. sin 2 1 from B f CP + B B f CP interf. Sanda, Bigi & Carter:. J/ y. V cb. B 0. K S. . V* 2. td. J/ y. V*. V tb. td. - PowerPoint PPT Presentation
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Belle results relevant to LHC
Pheno-07 May 8, 2007 Madison Wisc.
S.L. OlsenU of Hawai’i
CKM Global Fit (Sep.2006)
CKM is “correct” at tree level
B0
B0B0
Vcb
VtbV*
V*Vtb
J/
J/
KS
KS
sin21 from BfCP + BBfCP interf.
V*2
td
td
td
Sanda, Bigi & Carter:
Next step: use bs penguinsExample:
no KM phase
SM: sin21 = sin21 from BJ/ KS (bc c s)
unless there are other, non-SM particles in the loop
eff
Vtd
Vtd
+
1
B B
, ’,
1
, ’,
_
*
*
)(NP
top
M
MO
SM NP?
)(or )( of effectsExpect 2
2
NP
top
NP
top
M
MO
M
MO
i.e. > 0.1 for MNP accessible @ LHC~
~ s~
x
b
g~
t
2006: 1 with b s PenguinsSmaller than bccs in all of 9 modes
Smaller than bccs in all of 9 modes
Theory tends to predict positive shifts(originating from phase in Vts)
Naïve average of all b s modes
sin2eff = 0.52 ± 0.052.6 deviation betweenpenguin and tree (b s) (b c)
Naïve average of all b s modes
sin2eff = 0.52 ± 0.052.6 deviation betweenpenguin and tree (b s) (b c)
History of sin21
sin21 from bccs decays (2007)
2002
2003
2004
2005
2006
2.6
3.1
3.9
2.8
2.6
0.15
eff
sin
2 1
(b
s d
ecays)
(Belle&
BaB
ar
avera
ge)
~ s~
x
How to make small?
•Tune the squark mixing terms•is there enough freedom to do this?
•Make the squark masses degenerate•invoke a GIM-like mechanism
•Make the SUSY mass scale very high (~few TeV)•not much fun for LHC experimenters
b
g~
B
Decays w/ “Missing E(>1)”Decays w/ “Missing E(>1)”
B decay constant Lattice QCD
SM :
BSM : sensitive to New Physics from H
B (nearly invisible decays)
N= 680keff.= 0.29% purity = 57%
N= 680keff.= 0.29% purity = 57%
Charged B
(*)0 (*)1/ / / SB D a D
0 0 0/D D sD
Tag-side: Full reconstruction
449M BB
Υ(4S)e (8GeV)
e+(3.5GeV)
B
B
signal signal
4-momentum determined B meson beam !
4-momentum determined B meson beam !
Missingmomentum
Missingmomentum
B candidate event
B results
Belle Hadronic tag
eeff
D l tage
First evidence, 3.5
No clear signal
Belle BaBarPRL97, 251802 (2006). hep-ex/0608019
We measure
Branching fraction
Product of B meson decay constant ƒB and CKM element |Vub |
Compare with
Babar preliminary
Constraints on H mass
rH=1.130.51
Use known fB and |Vub |
Ratio to the SM BF.2
22
(1 tan )BH
H
mr
m
excluded
excl
uded
BXs
W+, H+
Nakao
NNLO calculation
(29826) x 10-6
M. Misiak et al, hep-ph/0609232, PRL 98,022002(2007)
Theory News
NN
LO
th
eory
Error on BF
Central value of BF
95% CL lower limit on H+ mass from exp and NNLO
M. Misiak et al, hep-ph/0609232, PRL 98,022002 (2007)
BaBar/Belle/CLEO avg M(H+)>295 GeV
300 GeV
BBXs
350- Look here
or
here
Validate the EECL simulation using double-taggedevents (with on the signal side) Signal reconstruction (purity ~
90%)Extra Calorimeter Energy
MC: B+B–: 494 ± 18 B0B0: 8 ± 2 Combined: 502 ±18
Data: 458
_