Workshop Summary & Outlook
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Transcript of Workshop Summary & Outlook
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Workshop Summary & Outlook
S. StoneOct. 16, 2013
Thanks to the organizers: John Ellis, Tim Gershon, Gino Isidori, Patrick Koppenburg, Gilad
Perez, Frederic Teubert, Andreas Weiler, Guy Wilkinson etc…
*Apologies if I did not mention your talk
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Prime Objective
Dictates that physics beyond the Standard Model must be found
“The success of the LHCb experiment has so far been a nightmare for all flavour physicists…” Gauld, Goetz and Haisch
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1 TeV Scale New Particles
Naturalness Higgs is most sensitive to physics of order M=125 GeV,
has been pushed to ~1 TeV due to absence of signals. Can be pushed higher. (Soni suggests 10 TeV for KK)
But corrections to Higgs mass go as M2, so can’t push M too high without getting into fine tuning problem (see Zupan’s talk)
Need New Physics to cut off quantum corrections Suggested NP mechanisms: SUSY, Higgs
compositeness, and extra dimensions. Each predicts a rich spectrum of new states
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Flavor as a High Mass Probe
Already excluded ranges if ci~1 , take ci = 1
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i
See: Isidori, Nir& Perez arXiv:1002.0900; Neubert EPS 2011 talk
Ways out1. New particles have
large masses >>1 TeV
2. New particles have degenerate masses (or alignment, see Shadmi’s talk)
3. Mixing angles in new sector are small, same as in SM (MFV)
4. The above already implies strong constrains on NP
New physics ruled outfrom Li=0 to somewherein the blue boxes
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Harink: Limits on NP Higgs Yukawa’s
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Generic Analyses Compare
measurements look for discrepancies
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NP via DF=2 processes Bo
(s) mixing and CP. Parameterize NP as h & s
Tree level processes are assumed not to contain NP, so measure well, especially Vub g
From Zoltan’s talk, now and future
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95% cl Limits
Current
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Future
Belle II, LHCb Upgrade Assuming no NPImplications workshop, Oct. 18, 2013 9
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Vub & Right Handed Currents
Although we assumed before that there was no NP in tree level diagrams, here we revoke that criteria
What do we know about right-handed currents in b decays?
CLEO result from ~1/fb
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….
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CLEO V-A cosq is D*+ decay angle
Implications workshop, Oct. 18, 2013 11This needs to be done much better
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A fix for Vub? Conflicts among Vub measurements Different processes have different
sensitivities to right-handed currents
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add right-handed current current
axial
vector & axial
vector
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Vub Data Vub values as
functions of eR
First done by:
Crivellin,
arXiv:0907.2461 Ligeti suggests
using rln to
measure eR
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LHCb does semileptonic decays
Used to measure fs/fd, otherwise Bs→m+m- is only half a measurement (inclusive e.g. DsmX ; n also used for As
sl) Exclusive semileptonic can also be done
using constraint of knowing b-decay direction (ala’ FNAL fixed target experiments)
Projections of 2-D fit to DsmXn
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combinatoric bkgrd
Ds+mn
Ds*+mn
P-wave Ds
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Shopping list Bs→K(*)mn Bs→Ds
(*) mn these & above used to provide an independent measure of Vub/Vcb
Bo→ro mn including right-handed current measurements
Bo→D*+ mn including right-handed current measurements
B→D** mn needed to understand Bo→D*+ , tn see talk of Ciezarek Implications workshop, Oct. 18, 2013 15
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Comments on g
See talk of Gandini Use clean methods only Don’t use B-→Dop-, due to
possible contamination
from Do CPV. Use B-→DoK- & eventually DsK
Don’t use Bo→p+p-, with Bo→K+K- assuming U-spin symmetry, but use this to measure the U-spin breaking, so we may be able to use U-spin for something else (e.g. limiting Penguins in fs)
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Top Down Analyses Here we pick a model and work out its
consequences in many modes Example
Girrbach
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Another Top Down Ex.
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B→K(*)l+l- I I find Kl+l- very interesting (Langenbruch talk) (1) Isospin asymmetry at 4.4 s level & doesn’t
look like experimental effect as not seen in K*l+l-. No model can reproduce effect. A real hint at NP or long distance effects that we do not understand? (Zwicky talk)
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AI
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B→K(*)l+l- II (2) Resonant substructure in l+l-. Should be
present in K(*)l+l-. Why hasn’t it been seen? Are
there more
states? Need to
put in K*
calculations.
Can affect
angular distributions far from mass
peaks as states are wide
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K*l+l- déjà vu DAcp?
1st DAcp then P5´ in one q2 bin. Theory input…
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B→K(*)l+l- III Much ado about discrepancy in one q2 bin with
some SM predictions In order to see NP must see more than one
effect. Need to establish a pattern van Dyk: some difference between using all
data and selected
red(all)
blue(sel)
68%, & 95%
cl intervals Implications workshop, Oct. 18, 2013 22
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B→K(*)l+l- IV Straub: top down model with multi-TeV Z´ can
explain data PS: some disagreement in theoretical
prediction uncertainty (see talks of van Dyk and Mahoudi) & relatively large errors. Wingate: lattice QCD can help
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Null Test From Charm Charm CPV not established. DAcp
HFAG = (0.33±0.12)% LHCb p± tags (-0.34±0.18)%, m± tags
(0.49±0.37)% My view |DAcp|<(1-e)%, where ~0.5 e (more data
needed) A very useful constraint on NP models
Not a null test: Charm mixing firmly established at 1% level, likely long distance effect , but x´ & y´ parameters not yet well measuredImplications workshop, Oct. 18, 2013 24
D0 (KK )(...) D0
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Null Tests from B CPV fs: 0.01±0.07±0.01 rad
potential use of all the Bs→J/y K+K- rate
(see Van Leerdam’s talk) ASL
s x3 statistics available Both important to search for NP
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Seeking NP at higher masses (Coco)
Since Higgs couples to mass we should do what we can on top quarks especially where we can do better than ATLAS & CMS despite the factor of 10 less ∫L
Strassler points out
other searches for new
Higgs decays or new
long lived particles Can also search for Majorana neutrinos
from D, B or even W decays Implications workshop, Oct. 18, 2013 26
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tt asymmetry Seen in CDF & D0 (By the way getting fed up with disproving
CDF/D0 results hinting at NP, e.g. fs, Asl) Because LHC is at larger h asymmetry is
larger than in ATLAS/CMS due to more qq and qg scattering
Use t→Wb, W→mn, Predictions of signal & background from
Kagan, Kamenik, Perez & Stone arXiv:1103.3747
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Predictions for LHCb t→Wb, W→ mn signal W+light quark jet
including charm
scaled to ATLAS
measured s. Single top production W+b jet (not from top) bb with one b→m, reduced by jet isolation
(anti-kt jet algorithm used) light dijet’s reduced by b tagging, jet isolation
& m id 28
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Necessary Ingredients for t→bW
W±→m±n detection Jet reconstruction and energy
measurement Require large efficiency for high pT, and
energy resolution so that sm(m-jet)~20 GeV
Algorithm for b-jet tagging Measurement of tagging efficiency (e) Measurement of light quark rejection (R) Requirement is R>100:1 for e>50%
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Current LHCb (Barter) Jet energy scale determined to 1% from Z+1
jet events For pT>10 GeV jet energy resolution is 10-
15% b-jet tagging: for 50% eff
have 99.5% light quark
rejection. bb asymmetry
already measured tt asymmetry measurement
is ready for prime time Implications workshop, Oct. 18, 2013 30
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Much other physics (Strassler)
Fortunately this is an extremely interesting niche because it is where the Higgs boson sits
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Conclusions Recall Prime Objective: to seek out and find
new physics wherever it may be hiding We have a great deal to do even with current
data: many areas not discussed in this workshop, e.g. CPV in Bo, Bs etc…light meson spectroscopy: qq versus tetraquark, etc..
Much to do with jets, right-handed currents, g, Vub, K(*)mm, even charm
It will be fun! Much thanks to our theory friends for comingImplications workshop, Oct. 18, 2013 32
For Yuval
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Pleasant Dreams!
LHCb discovers New Physics
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The End
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Signal example
Predicted cross-section difference between t and t in the Z´ model of Jung et al. [arXiv:0907.4112]
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