beauty 2006 1 tim gershon, beauty 2006, september 29 th conference summary & future prospects...
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BEAUTY 2006
1Tim Gershon, Beauty 2006, September 29th
CONFERENCE SUMMARY &
FUTURE PROSPECTS
Tim Gershon, University of Warwick
September 29th 2006
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Disclaimer
2Tim Gershon, Beauty 2006, September 29th
Far too many interesting talks and impressive results to cover everything ...
Sorry if I miss your favourite topic
Beauty 2006: The 11th International Conference on B Physics at Hadron Machines
Will mostly focus on B physics (not c, cc, τ, ...)
... will also mention lepton machines!
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The Ubiquitous Unitarity Triangle
3Tim Gershon, Beauty 2006, September 29th
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B Physics Highlights 2006
4Tim Gershon, Beauty 2006, September 29th
Huge amounts of statistics at the B factories
Enormous numbers of conference papers BaBar 114http://www-public.slac.stanford.edu/babar/
ICHEP06_papers.htm Belle 38 (still increasing) http://belle.kek.jp/conferences/ICHEP2006/
Yet 2006 is the year of the Tevatron ...
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Atoworld! (© K.Peach)
5Tim Gershon, Beauty 2006, September 29th
PEP-II (BaBar)391/fb
KEKB (Belle)630/fb
KEKB + PEP-II
reached on July 13, 2006
~ 1 Billion BB pairs
Inte
gra
ted L
um
inosi
ty (
fb-1)
NB. Not all luminosity is on Υ(4S)!
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The Golden Mode: J/ψ KS, etc
6Tim Gershon, Beauty 2006, September 29th
B0 tag_B0 tag B J/KS
B J/KL
BELLEhep-ex/0608039N(BB)=532m
BABAR hep-ex/0607107N(BB)=348m
LACKER
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The Golden Mode: J/ψ KS, etc
7Tim Gershon, Beauty 2006, September 29th
B0 tag_B0 tag B J/KS
B J/KL
BELLEhep-ex/0608039N(BB)=532m
BABAR hep-ex/0607107N(BB)=348m
Now sufficient statistics to compare CP in different charmonium kaon final states (ψ(2S)KS, χc1KS, ηcKS)
0.675 ± 0.026
LACKER
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The ambiguity
8Tim Gershon, Beauty 2006, September 29th LACKER
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The ambiguity – D*D*KS
Tim Gershon, Beauty 2006, September 29th 9
ηy (Dalitz half-plane) +1 -
1
>0 from theory, but ...- structure in D*D*?- structure in D*KS?
theoretical re-examination desirable
Browder et al., PRD 61 (2000) 054009
LACKER
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The ambiguity
10
Tim Gershon, Beauty 2006, September 29th
All three modes point to SM solution Qualitative conclusion easy, but Quantitatively very difficult!
To do a really good job need some hard work on hadronic phenonema
Kπ S-wave in J/ψ K* contributions to D*D*KS Dalitz plot D→KSπ
+π- modelThese & very similar questions
reoccurLACKER
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α ≡ φ2 ––– ππ
11
Tim Gershon, Beauty 2006, September 29th
_
BELLEhep-ex/0608035N(BB)=532m
BABAR hep-ex/0607106N(BB)=350m
BIANCHI
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α ≡ φ2 ––– ππ
12
Tim Gershon, Beauty 2006, September 29th
_
BELLEhep-ex/0608035N(BB)=532m
BABAR hep-ex/0607106N(BB)=350m
BIANCHI
BaBar confirm Belle's observation of large CP violation in B→π+π-
Additionally Belle observe large direct CP violation, not confirmed (nor refuted) by BaBar
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α ≡ φ2 ––– ππ Isospin
analysis
13
Tim Gershon, Beauty 2006, September 29th
_
M.Gronau & D.London, PRL 65 (1990) 3381
Different statistical treatments ⇔ surprisingly different answers
BIANCHI, T'JAMPENS
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Statistics
14
Tim Gershon, Beauty 2006, September 29th
Frequentist: probability about the data (randomness of measurements), given the model
P(data|model)
Hypothesis testing: given a model, assess the consistency of the data with a particular parameter value 1-CL curve (by varying the parameter value)
[only repeatable events (Sampling Theory)]
Bayesian: probability about the model (degree of belief), given the data
P(model|data) Likelihood(data,model) Prior(model)
P(data|model) ≠ P(model|data):
model: Male or Femaledata: pregnant or not pregnant
P (pregnant | female) ~ 3%
but
P (female | pregnant) >>>3%
T'JAMPENS
OTHER “PRIOR” EVENTS
IMPORTANT!
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Sir Francis Bacon
15
Tim Gershon, Beauty 2006, September 29th CASHMORE
Father of the scientific method:inductive reasoning & hypothesis testing
“Histories make men wise; poets, witty; the mathematics, subtile; natural philosophy, deep; moral, grave; logic and rhetoric, able to contend.”
(able to contend ~ contentious)
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α ≡ φ2 ––– ρρ Isospin
analysis
16
Tim Gershon, Beauty 2006, September 29th
_
M.Gronau & D.London, PRL 65 (1990) 3381
Input from HFAG – rare decays
BIANCHI, ZUPAN
BABAR hep-ex/update
N(BB)=XXXm
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γ ≡ φ3 ––– DK methods
17
TRABELSI, ZUPANTim Gershon, Beauty 2006, September 29th
Contours do not include model uncertainties
Current best precision from D→KSπ
+π- (Dalitz
method) Associated model
uncertainty Very difficult to reduce
without information from CP tagged D mesons (CLEO-c)
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γ ≡ φ3 ––– KSπ+π- model
18
TRABELSI, ZUPANTim Gershon, Beauty 2006, September 29th
BABAR hep-ex/0607104N(BB)=347m
~390,000 D*+ → Dπ+ decays (270/fb)
χ2/ndf ~ 1.3
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γ ≡ φ3 ––– DK methods
19
TRABELSI, XIE, ZITO, ZUPAN
Tim Gershon, Beauty 2006, September 29th
Best approach is to combine many different B & D decays
New BaBar results with D→K+π-π0
No signal for suppressed amplitude yet ⇔ rB smaller
than expected? Await results on new
channels
FAVOURED
SUPPRESSED
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Vcb & Vub
20
Tim Gershon, Beauty 2006, September 29th
“If a man's wit be wandering, let him study the
mathematics”
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Vcb – Inclusive
21
BARBERIO, PAZTim Gershon, Beauty 2006, September 29th
(statistical errors only)
D*
D**
D
BelleUnfolded Mx
2 spectrum
Mx2 (GeV2/c4)
|Vcb| = (41.93 ± 0.65fit ± 0.48αs ± 0.63th )×10-3
|Vcb| = (41.5 ± 0.5fit ± 0.2τ )×10-3
Kinetic scheme
1S schemeError: 1–2%
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Vcb – Inclusive
22
BARBERIO, PAZTim Gershon, Beauty 2006, September 29th
Exp HQ sl
Global fit Kinetic scheme expansion - all experiments (Buchmuller, Flaecher PRD73:073008 (2006))
Belle new measurements missing
Vcb @ 2%
mb < 1% crucial for Vub
mc @ 5%
Inclusive modes:
|Vcb|=(41.96±0.23exp±0.35HQE±0.59SL)10-3
Exclusive modes:
|Vcb|excl=(39.40.9exp1.5theo)10-3
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Vub – Inclusive
23
GIBBONS, PAZTim Gershon, Beauty 2006, September 29th
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Vub – Exclusive (B → πlν)
24
GIBBONS, DAVIES, PAZTim Gershon, Beauty 2006, September 29th
BaBar: 12 bins!
Improved lattice
calculations
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Discovery Mantra
25
Tim Gershon, Beauty 2006, September 29th
Hadron colliders are discovery machines, lepton colliders are for precision measurements
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Δms
26
Tim Gershon, Beauty 2006, September 29th BELLONI
>5σSensitivity 31.3/ps
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Δms & Δmd
27
Tim Gershon, Beauty 2006, September 29th BELLONI, DAVIES
Δms = (17.77 ± 0.10 ± 0.07)
ps-1
Δmd = (0.507 ± 0.005) ps-1 (PDG
2006)
Belle
|Vtd/Vts| = 0.2060 ± 0.0007 (exp) +0.0081–
0.0060 (th)
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Δms --- The end of the
line?
28
Tim Gershon, Beauty 2006, September 29th
Yes, this is very pretty ....
... but why not aim for this?
μ (g – 2)
Obviously, same precision not necessaryyet Δmsposter child for B physics at hadron
machines
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What comes next?
29
Tim Gershon, Beauty 2006, September 29th
We have measurements (to varying degrees of precision) of all UT sides and angles
No clear discrepancy with the SMSuccess of CKM description
Why should we improve the precision?
We still have all the unsolved problems of the SM hierarchy problem → TeV scale NP → flavour
problem baryon asymmetry of the universe neutrino masses 3 quark & lepton generations
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Are surprises possible?
30
Tim Gershon, Beauty 2006, September 29th
Are there measurements which could have a comparable impact to KL→π+π- ? Inconsistent CPV phenomena in (eg.) b→sss New FCNCs Unpolarised photons in (eg.) b→sγ Large CPV in ASL(Bs) &/or φs
Enhanced v. rare decays, (eg.) Bs→μμ CP violation in charm τ lepton flavour violation &/or CP violation ...
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The FCNC Matrix
31
From
G.Isid
ori, v
ia
O.S
chneid
er
kaon physics
Tim Gershon, Beauty 2006, September 29th
BE
AU
TY2
00
3 p
an
el
discu
ssion
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A Goldish Mode: η'KS,
etc
32
Tim Gershon, Beauty 2006, September 29th
BELLEhep-ex/0608039N(BB)=532m
BABAR hep-ex/0609052N(BB)=384m
USHIRODA
NEW!
5.5σ5.6σ
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CP violation
33
Tim Gershon, Beauty 2006, September 29th
CP violation has now been seen in K0K0 mixing (εK) interference between s→uud and s→ddd decay
amplitudes (ε') interference between B0B0 mixing and
b→ccs decay amplitudes (J/ψK0) b→uud decay amplitudes (π+π-) b→sss decay amplitudes (η'K0)
interference between b→uud and b→duu decay amplitudes (π+π-)
interference between b→suu and b→uus decay amplitudes (K+π-)
ALL CONSISTENT WITH KM MECHANISM
[Not yet seen in charged particle decays, baryons, leptons, ...]
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Hadronic b → s penguins
34
Tim Gershon, Beauty 2006, September 29th
“The root of all superstition is that men observe when a thing hits, but not when it
misses”
BA
BA
R:
Tim
e-d
ep
en
den
t D
P a
naly
sis
of
B→
K+K-
K0
USHIRODA
WE NEED MORE DATA
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B(s) → h+h'-
35
Tim Gershon, Beauty 2006, September 29th BENEKE, MORELLO
(speaker's calculation)
ACP(Bs→Kπ) =
New light on the “Kπ puzzle” from Bs decays – Bs→KSπ0
important?
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Radiative B decays
36
Tim Gershon, Beauty 2006, September 29th HURTH, LIN, RICHMAN
Four of Standard Model predictions: No tree-level FCNC top & W (Z,H) heaviest particles weak interactions are V-A only one CP violating phase
Can experimentally probe each and all of these rates (new NNLL calculation) asymmetries
direct CP, isospin, forward-backward, time-dependent
polarization
hep-ex/0607071 (preliminary, sub. to PRL)
spectrum not efficiencycorrected
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AFB in K*l+l-
37
Tim Gershon, Beauty 2006, September 29th HURTH, LIN, RICHMAN
Belle, PRL 96, 251801 (2006)BaBar, PRD 73, 092001 (2006)
One of most interesting hints ... NEED MORE DATA!
Inclusive AFB in Xsl+l- theoretically (even)
cleaner
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CP in Bs mixing
38
Tim Gershon, Beauty 2006, September 29th
NIERSTE, CHEU, BLUSK, CHANDRA,
MAGINI
Important measurements: ΔΓs, Γs, φs, ASL
s, (Δms)
New prediction: ΔΓs = (0.090 ± 0.017) ps-1
cf. τs = (1.461 ± 0.040) ps
Size of ΔΓs crucially important for untagged
measurements of φs (also possible at Υ(5S))
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CP in Bs mixing
39
Tim Gershon, Beauty 2006, September 29th
NIERSTE, CHEU, BLUSK, CHANDRA,
MAGINI
Tagged measurementswill be much more
sensitive to φs
...these are possible now!
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Bs → μ+μ-
40
Tim Gershon, Beauty 2006, September 29th
“God hangs the greatest weights upon the smallest
wires”
IKADO, LIN, SMIZANSKA
B(Bs→μμ) < 1.0 10-7
B(Bd→μμ) < 3.0 10-8 Also lν(γ), llγ, ττ
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The Excitement Mounts
41
Tim Gershon, Beauty 2006, September 29th
We are reaching the culmination of a long-running saga
Many books have been written, films have been made
The journey has not been without thrills and spills
Millions of people worldwide are eagerly awaiting the outcome ....
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42
Tim Gershon, Beauty 2006, September 29th
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LHC preparation
43
Tim Gershon, Beauty 2006, September 29th
I will not attempt to summarise details from several excellent status reports
Please refer to slides of Burckhart, Eerola, Buchmuller, Schilling,
Garrido, Corti, Kirk, Rodrigues, Ruizand relevant Tevatron experience in talks of Annovi, Bauer, Moulik, and others
Take home message:Prospects for B physics at the LHC are very
exciting ...... but much hard work lies ahead!
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LHC(b) Key Measurements
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Tim Gershon, Beauty 2006, September 29th
α (π+π-) γ (DK) γ (hh' + U-spin) ΔΓs
ASLs
φs (Bs → J/ψ φ, etc.) Bs → φγ Bs → μμ B → K(*)ll, Bs → φll
α (π+π-π0 & ρ0ρ0) γ (DK) γ (DsK) ASL
s
φs (Bs → J/ψ φ, etc.) Bs → φφ, etc. Bs → φγ Bs → μμ B → K(*)ll, Bs → φll
ROBBE, CARBONE, XIE, SMIZANSKA, DE CAPUA, MAGINI,
MUHEIM
1st year or so ... ... and later
Very rough and incomplete lists
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Motivation for Super B Factory
45
How to beat theoretical (hadronic) uncertainties? Measure ratios, asymmetries, etc. Exploit flavour symmetries (isospin, U-spin,
SU(3)) these approaches key to LHC(b) program
Avoid hadrons in the final state neutrinos ← impossible in hadronic
environment photons ← difficult in hadronic environment charged leptons
e, μ, τ ← e difficult, τ impossible Use inclusive final states
Xs, Xd ← impossible in hadronic
environment
Tim Gershon, Beauty 2006, September 29th BEVAN
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Richard Dalitz 1925-2006
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Not nearly enough time to discuss all applications of the Dalitz analysis technique
Even a small selection enough to demonstrate the profound usefulness of the method
Will continue to throw light on both strong and weak interactions, and perhaps new physics, into the LHC
era, and beyond
physics/0603219Nucl.Phys.A 771, 8
(2006)
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Thanks to the Organisers
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Tim Gershon, Beauty 2006, September 29th
Andy CarslawSue Geddes (Conference
Secretary)Pete Gronbech
Neville Harnew (Local Chair)Jim Libby
Jonas RademackerGuy Wilkinson
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Closing thought
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“Reading maketh a full man, conference a ready man, and writing an exact
man.”
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THE END
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“Discretion in speech is more than eloquence.”
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Unitarity Triangle
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Convenient method to illustrate (dis-)agreement of observables with
CKM prediction
Tim Gershon, Beauty 2006, September 29th
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KM Prediction
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Re
Im
J/2
All
measu
rem
en
ts m
ust
ag
ree
Picture by A.HoeckerTim Gershon, Beauty 2006, September 29th
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The ambiguity – J/ψ K*
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UPDATESNECESSAR
Y
N(BB)=88m
N(BB)=275m
highly non-
Gaussian errors
LACKER
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The ambiguity – D(*)h0
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Tim Gershon, Beauty 2006, September 29th
UPDATESNECESSAR
Y
N(BB)=311m
N(BB)=386m
highly non-
Gaussian errors
Bondar et al., PLB 624 (2005) 1
Also constraints on sin(2β) [testing arg(b→cud) = arg(b→ccs)]
measurements with D→CP eigenstates will improve this test
LACKER
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α ≡ φ2 ––– ππ
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_
BELLEhep-ex/0608035N(BB)=532m
BABAR hep-ex/0607106N(BB)=350m
BaBar confirm Belle's observation of large CP violation in B→π+π-
Additionally Belle observe large direct CP violation, not confirmed (nor refuted) by BaBar
BIANCHI
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α ≡ φ2 ––– ππ Isospin
analysis
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_
M.Gronau & D.London, PRL 65 (1990) 3381
Input from HFAG – rare decays
BIANCHI, ZUPAN
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α ≡ φ2 ––– π+π-π0 Dalitz plot
analysis
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A.Snyder & H.Quinn, PRD 48 (1993) 2139
BIANCHI, ZUPAN, ROBBE
B0
B0
Monte Carlo
Interference provides information on strong phase difference
Time-dependent Dalitz-plot analysis assuming isospin simmetry.
26 coefficients of the bilinear form factor terms occurring in the decay rate are measured with a UML fit. Physically relevant quantities are derived from subsequent fits to these coefficients.
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α ≡ φ2 ––– π+π-π0 Dalitz plot
analysis
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A.Snyder & H.Quinn, PRD 48 (1993) 2139
BIANCHI
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α ≡ φ2 ––– π+π-π0 Dalitz plot
analysis
58
A.Snyder & H.Quinn, PRD 48 (1993) 2139
BIANCHI
[0,8]o U [60,95]o U[129,180]o
at 68.3% C.L.
(deg) (deg)
1-
C.L
.
1-
C.L
.
Tim Gershon, Beauty 2006, September 29th
Belle constraint improved using “isospin pentagon”
Indication of direct CP violation
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DCPV in 3 body B decay
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Dalitz analysis → measure hadronic parametersSearch for DCPV in B+ → K+π+π-
mππ (GeV/c2)
Clear asymmetry in the ρ region
Belle, hep-ex/0512066
ACP(ρK+) = (30 ± 11 ± 2 +11-4)% 3.9σ
significancefirst evidence for CPV in any charged particle!
Dalitz analysis →enhanced sensitivity to
CPV
BaBar result not shown hereTim Gershon, Beauty 2006, September 29th
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Luminosity trends
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L > 1034/cm2/s
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Asymmetric B Factories
61
PEPII at SLAC9.0 GeV e- on 3.1 GeV
e+
KEKB at KEK8.0 GeV e- on 3.5 GeV
e+
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BaBar Detector
62
DIRC PID)144 quartz bars
11000 PMs
1.5 T solenoid EMC
6580 CsI(Tl) crystals
Drift Chamber40 stereo layers
Instrumented Flux Returniron / RPCs (muon / neutral hadrons)
2/6 replaced by LST in 2004Rest of replacement in 2006
Silicon Vertex Tracker5 layers, double sided strips
e+ (3.1 GeV)
e- (9 GeV)
Tim Gershon, Beauty 2006, September 29th
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Belle Detector
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/ KL detection 14/15 lyr. RPC+Fe
Central Drift Chamber small cell +He/C2H6
CsI(Tl) 16X0
Aerogel Cherenkov cnt. n=1.015~1.030
Si vtx. det.- 3 lyr. DSSD- 4 lyr. since summer 2003
TOF counter
SC solenoid 1.5T
8 GeV e
3.5 GeV e
Tim Gershon, Beauty 2006, September 29th
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“Unified and Unbiased Attack on New Physics”
Newphysics
Quark sectorLe
pto
n se
ctor
Ener
gy
fron
tier
experiments,g–2, e, EDM, …
Super B factory, LHCb, K experiments …
LHC, ILC
mass and mixingCPV and LFV
mass spectruminteractions
flavour mixingCPV phases
τ LFVτ CPV
T. Browder, FNAL Seminar, 2006
Tim Gershon, Beauty 2006, September 29th