the Fourth Generation
description
Transcript of the Fourth Generation
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4G Dervish George W.S. Hou (NTU) 3-B3GSM@BOUN, 10/23/2011 1
the Fourth Generation
Thoughts and Directions
October 23, 2011, 3-B3GSM @ BOUN
on
diaz site !!! at http://flickr.com/photos/7339233@N05/ 1843725867
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4G Dervish George W.S. Hou (NTU) 3-B3GSM@BOUN, 10/23/2011 2
I. Intro: Capri’08; 1st BSM3 & 4 Statements; 2nd BSM3; Summer’11
II. From Hints to Measurements: Indirect/Direct Bs → J/ / Bs → / B → K*║ mt ; BR(t → b W*)
III. Enhancing Small Numbers nEDM4; BAU4
IV. Breaking the Unitarity “Bound” Yukawa-bound Ultra Heavy “Mesons” — Relativ. Bound State Issues; Lattice; [“Bootstrap” Gap Equation
V. Conclusion
Outline
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CPV George W.S. Hou (NTU) NCU, Oct 6, 2009 3
I. Intro
arXiv:0805.4393 [hep-ph]
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4G Dervish George W.S. Hou (NTU) 3-B3GSM@BOUN, 10/23/2011 4
~ 133 citations ~ 133 citations today
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4G Dervish George W.S. Hou (NTU) 3-B3GSM@BOUN, 10/23/2011 5
http://indico.cern.ch/conferenceDisplay.py?confId=68036
Summarized this morning.
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Fourth Generation George W.S. Hou (NTU) TOP2010, Bruges, 100603 6
sin2Bs ~ 0.5 - 0.7
WSH, Nagashima, Soddu, PRD’07 (already in 05)
sin2Bs ~ 0.33
WSH, Ma, arXiv:1004.2186 [hep-ph]
4th generation “prediction” still robust, but needs LHCb to verify.
Also, Soni et al., arXiv:1002.0595 [hep-ph] Buras et al. arXiv:1002.2126 [hep-ph] Lenz et al., arXiv:1005.3505 [hep-ph]
curios 1.2 too
sin2Bs ≡ sin s
≡ sin2 s
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Sum 2-B3GSM George W.S. Hou (NTU) 3-B3GSM@BOUN, 10/23/2011 7
Gerhard RavenB Physics Results from the LHC
Practically All Flavor/CPV Hints are “Gone” !!
Practically All Flavor/CPV Hints are “Gone” !!
LP11
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4G Dervish George W.S. Hou (NTU) 3-B3GSM@BOUN, 10/23/2011 8
II. From Hints to Measurements: Indirect/Direct
Measuring CKM4 Solely @ LHC
t, t ’
t, t ’
btst VV
btst VV
,t ’
sbisb er
btst VV
btV
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4G Dervish George W.S. Hou (NTU) 3-B3GSM@BOUN, 10/23/2011 9
Andrei Golutvin @
s[sins ~ 0.74]
Andrei: Do you like the 1 fb number I gave, George?
George: Well, perhaps 0.3 0.1 better
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4G Dervish George W.S. Hou (NTU) 3-B3GSM@BOUN, 10/23/2011 10
7.0 2.4 x 109
reachable w/ 1 fb ?
CERN RRB April 2011
Add ATLAS/CMS !
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4G Dervish George W.S. Hou (NTU) 3-B3GSM@BOUN, 10/23/2011 11
Gerhard RavenB Physics Results from the LHC
LP11
Getting Interesting: 4G could enhance
Getting Interesting: 4G could enhance BBss → → by ~ 2 ! by ~ 2 !
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4G Dervish George W.S. Hou (NTU) 3-B3GSM@BOUN, 10/23/2011 12
Gerhard RavenB Physics Results from the LHC
LP11
I was devasted by this, and mildly depressed in September …
I was devasted by this, and mildly depressed in September …
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4G Dervish George W.S. Hou (NTU) 3-B3GSM@BOUN, 10/23/2011 13
Measuring CKM4 Solely @ LHC
t, t ’
t, t ’
,t ’
btst VV
btst VV
btst VV
Bs
==
SM3
Trick: Take Ratio of
Bs → and ms
Remove dependence,
only left.
SM3
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4G Dervish George W.S. Hou (NTU) 3-B3GSM@BOUN, 10/23/2011 14
Measuring CKM4 Solely @ LHC
t, t ’
t, t ’
,t ’
btst VV
btst VV
btst VV
Bs
Could by smaller than SM3
Anticipating 2012
“2” SM3-like
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4G Dervish George W.S. Hou (NTU) 3-B3GSM@BOUN, 10/23/2011 15
sbier
sbbtst VV
Measurement
Anticipating 2012
“2” SM3-like
Smaller than SM3
Intersect at ~ SM3 value
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4G Dervish George W.S. Hou (NTU) 3-B3GSM@BOUN, 10/23/2011 16
sbier
sbbtst VV
Measurement
A Third Measureable: AFB
~ SM3 !Contours of
x
Sample points: blue; purple;
red; green.
x
Allowed
008.0 |VV| btst for mt’ = 550 GeV
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4G Dervish George W.S. Hou (NTU) 3-B3GSM@BOUN, 10/23/2011 17
sbier
sbbtst VV
Measurement
Sample points: blue; purple;
red; green.
Allowed
for mt’ = 550 GeV008.0 |VV| btst
The refined measurements of
˙ sin2Bs
˙ B (Bs → ) ˙ A FB (B0 → K *0)
together with mt’, will pinpoint
the value of
btst VV
Take red point to illustrate the
MeaningMeaning.
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4G Dervish George W.S. Hou (NTU) 3-B3GSM@BOUN, 10/23/2011 18
btst VV
tbtsVV
cbcsVV
cbcdVV-
ubudVV
ubusVV
OS
b b →→ s s
b →→ d
SM |VV tbts
70 0.0065 ieer sbiVV
sbbtst
t, t ’
t, t ’
btst VV
btst VV
,t ’
Belle/BaBar Measurement KM Nobel
Measurement of
Determine (knowing t ’ mass) ~ Triangle Relevant for BAU?
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4G Dervish George W.S. Hou (NTU) 3-B3GSM@BOUN, 10/23/2011 19
but TCPV hint is now diminished …
t, b
phase space suppressed
vs
CKM suppressed
BR(b → t W*)determines bt V
so then
bt
V
Y. Chao et al., PRD 11
virtual
Threshold enhanceddetermination of CKM4
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4G Dervish George W.S. Hou (NTU) 3-B3GSM@BOUN, 10/23/2011 20
III. Enhancing Small Numbers
nEDM4 and BAU4
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4G Dervish George W.S. Hou (NTU) 3-B3GSM@BOUN, 10/23/2011 21
21
New neutron EDM expts underway …
» for BAU «
nEDM4
Borderline even if hadronic enhanced by 103
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4G Dervish George W.S. Hou (NTU) 3-B3GSM@BOUN, 10/23/2011 22
Pospelov & Ritz, PRD’01
Hamzaoui & Pospelov, PLB’95
Hamzaoui & Pospelov, PRD’96
Hou & Ma, PRD’10
nEDM4 ~ 1031 e cm
effective 3-loop estimate, picking out large momenta in loop
w/ Fanrong Xu & Junji Hisanp, to appear PRD 11
nEDM is a slow (safe) track for 4G
nEDM4 estimate
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4G Dervish George W.S. Hou (NTU) 3-B3GSM@BOUN, 10/23/2011 23
BAU4 estimate
• Farrar & Shaposhnikov claimed, in 1993, that SM3 could generate BAU by CP violating scattering of quasi-particles (thermal excitations of q & anti-q) with bubbles of the Higgs condensate
• This was shot down by Gavela, Hernández, Orloff and Pène in 1994, who pointed out FS neglected the damping length in the plasma (mainly QCD)
• Huet & Sather gave in PRD’95 a lucid account, finding conservatively
• We find, following the steps of HS,
bu
bb
le w
all
Problem: Large Yukawa coupling. w/ Masaya Kohda & Yoshio Kikukawa (prelim.)
seem sufficient !
Too small !
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4G Dervish George W.S. Hou (NTU) 3-B3GSM@BOUN, 10/23/2011 24
IV. Breaking the Unitarity “Bound”
Yukawa-bound Ultra-heavy Mesons; pheno?Lattice future
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4G Dervish George W.S. Hou (NTU) 3-B3GSM@BOUN, 10/23/2011 25
LP11
b' Search @ LHCb' Search @ LHC
same sign dileptons
Pa
rtia
l W
av
e
Pa
rtia
l W
av
e U
nit
ari
ty B
ou
nd
Un
ita
rity
Bo
un
d
b'b' ( (→→ W Wt)t) b'b'
_
Will cross UB w/ 2011-2012 data Non
per
turb
a
Non
per
turb
ative
tive
PLB 11
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4G Dervish George W.S. Hou (NTU) 3-B3GSM@BOUN, 10/23/2011 26
Bethe-Salpeter approach to new Heavy IsospinHeavy Isospin
Jain et al., PRD 92; 94 semi-degenerate
cov.
± ± +
+
Isosinglet 1 lightest
↬↬ CollapseCollapse for large mlarge mQQ su
btra
ct s
-cha
nnel
becomes most attractive!
but s-channel is repulsive !Ishiwata & Wise, PRD 11 relativistic correction study
breaks down ?
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4G Dervish George W.S. Hou (NTU) 3-B3GSM@BOUN, 10/23/2011 27
Ishiwata and Wise, PRD 11
Fourth generation bound statesrelativistic expansion study
breaks down ?My interpretation:• QCD-bound for GeV scale binding energy• Sudden turn-on of Large Yukawa Coupling ⇒ Sudden drop in radius jump in binding energy• Rel. Expan. fails just when it turns interesting.
accidental degeneracy
less bound
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4G Dervish George W.S. Hou (NTU) 3-B3GSM@BOUN, 10/23/2011 28
Bethe-Salpeter approach to new Heavy IsospinHeavy Isospin
Jain et al., PRD 92; 94 semi-degenerate
cov.
± ± +
+
Isosinglet 1 lightest
↬↬ CollapseCollapse for large mlarge mQQ su
btra
ct s
-cha
nnel
becomes most attractive!
but s-channel is repulsive !Ishiwata & Wise, PRD 11 relativistic correction study
breaks down ?
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4G Dervish George W.S. Hou (NTU) 3-B3GSM@BOUN, 10/23/2011 29
: “usual”
:
Goes down fast w/ mQ
• Tight, Relativistic Bound State (large q!)
• “Negative Energy Potential” Matters!
• What does collapse mean? What about s-channel subtr.?Enkhbat, WSH, Yokoya, to appear PRD deep boundstate production/decay …
vani
sh fo
r ze
ro r
el. m
otio
n
Yukawa / 5
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4G Dervish George W.S. Hou (NTU) 3-B3GSM@BOUN, 10/23/2011 30
no gg production
mQ = 500 – 700 GeV; binding to 0 GeV
1 to 1.4 TeV
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4G Dervish George W.S. Hou (NTU) 3-B3GSM@BOUN, 10/23/2011 31
Decay
narrow
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4G Dervish George W.S. Hou (NTU) 3-B3GSM@BOUN, 10/23/2011 32
Results
dijet
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4G Dervish George W.S. Hou (NTU) 3-B3GSM@BOUN, 10/23/2011 33
from the Abstract
Enkhbat, WSH, Yokoya, to appear PRD
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4G Dervish George W.S. Hou (NTU) 3-B3GSM@BOUN, 10/23/2011 34
Lattice: only known nonpert. approach
Last name: LinFirst name: C.-J. DavidAffiliation: National Chiao-Tung UniversityEmail address: [email protected]: Study of the Higgs-Yukawa Theory at the Strong-Yukawa RegimeAuthors: John Bulava, Philipp Gerhold, George W.-S. Hou, Karl Jansen, C.-J. David Lin, Kei-Ichi Nagai, Attila Nagy, Kenji Ogawa, Brian SmigielskiType: ParallelSession: Applications beyond QCDAbstract: We present an on-going project on the Higgs-Yukawa theory in theregime of large bare Yukawa coupling. We use the overlap fermion andthe pHMC algorithm in this work. Our preliminary study shows that there exists a symmetric phase (vanishing scalar vacuum expectation value) in this regime. We also comment on the investigation of the spectrum.
talk at Lattice 2011
Remote Talk tomorrow
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4G Dervish George W.S. Hou (NTU) 3-B3GSM@BOUN, 10/23/2011 35
V. Conclusion
• Measure CKM relevant (?) for BAU at LHC [measure also
• nEDM4 safe; BAU4 “possible”
• Unitarity BoundUnitarity Bound approached with 2011-2012 LHC Data
• Need Lattice Study/Understanding to Go Beyond
BR(t → b W*)
Ultra Relativistic, Strong/Nonpert. BoundStates !?
Transition ~ Moriond / Summer Conf. 2013
We await the light SM Higgs verdict