Part I: 3-sigma anomaly of W->tau nu decay in new physics beyond SM ----first clean hint of right-handed charge current? (hep-ph/0504123). 朱守华（ Shou-hua Zhu） Peking University July 2005 @ Tsinghua Univ. 3-sigma anomaly of W->tau nu measurements Anomaly in 2HDM and MSSM
3-sigma anomaly of W->tau nu decay
in new physics beyond SM
----first clean hint of right-handed charge current?
July 2005 @ Tsinghua Univ.
3-sigma anomaly of W->tau nu measurements
Anomaly in 2HDM and MSSM
Anomaly indicates right-handed charge current?
1: Puzzles stand for new dynamics
2: Puzzles stand for ignorance (both theoretical and expt.)
Anomaly mainly comes from L3
3-sigma anomaly of W->tau measurements, hep-ex/0412015
In SM involved is only pure left-handed charge current
Simpler kinematics and less hadronic uncertainties.
Oblique-type corrections -> NO!
Satisfy neutral-current data (Z-decay) at O(0.1%)
Satisfy tau-> nu_tau l nu_l data
Tan(beta) enhancement flavor interactions
Higgs-fermion Yukawa couplings in 2HDM
Chargino(Neutrolino)-fermion couplings in MSSM
2-Higgs doublet model (2HDM) important:
Negative except for near-degenerate Higgs mass case:
Lebedev etal., PRD62(2000)055014
Use FeynArts, FormCalc, LoopTools to scan parameter space
In most cases, delta_new is negative
In all cases
Anomaly in 2HDM and MSSM important:
and neutral data.
Anomalous left- and right-handed couplings important:
From W->tau nu_tau data:
Constraints from tau-decay data important:
Delta_L and Delta_R are constrainted by Michel parameters which can be extracted from energy spectrum of daughter letopn in tau->nu_tau l nu_l.
Allowed small regions at 95% CL important:
dR: 0-> 0.12
dL: 1-> 1.005
3rd generation quark :
From B->X_s gamma measurements:
Re(dR)< 4 10-3 for Wtb
F. Larios etal., PLB457 (1999)334
|dR| 0.12 for W
Summary for 1st part (questions) important:
Is W->tau nu_tau 3-sigma anomaly the first clean signal for the existence of right-handed charge current?
How is this anomaly related to fermion mass generation (flavor physics)?
Will parity be restored at high energy?
Does anomaly indicate the non-universality of gauge interactions for different generation? X.Y. Li and E. Ma, PRL47, 1788(1981)
July 2005@ Tsinghua Univ.
Why Split SUSY (SS)?
How to distinguish SS from TeV SUSY?
Chargino pair production at Linear colliders
Naturalness problem in the SM important:
mHphy= mH0 +c 2+…, ---new physics scale
=> New Physics should appear at TeV
(TeV/ EW ~10)
Solutions (TeV scale New Physics) to Naturalness problem
TeV SUSY or little Higgs models
Low scale gravity
Composite Higgs boson etc.Why Split SUSY? (I)
Akani-Hamed, future colliders), but …
S. Dawson, LP2005 future colliders), but …
S. Dawson, LP2005 …), but …
Akani-Hamed, …), but …
Fine tuning => …), but …
Assuming UNKNOWN mechanism for finely tuned CC is also applied to Higgs sector…
N. Arkani-Hamed &S. Dimopoulos, hep-ph/0405159
(a) GUT ( slightly improved)
(b) Dark Matter density
(c) higher Higgs mass (120~160 GeV)
(d) cures to most of TeV SUSY diseases etc.
SS has only principles onefinely tuned and light Higgs boson while other scalars are ultra heavy.
Gaugino and Higgsino might be light.
Effective Lagrangian at low energy, besides kinetic terms, after integrating out higher scalar mass:What is Split SUSY?
Precisely measuring Higgsino-gaugino-Higgs vertexes e.g. O(0.1 fb) hep-ph/0407108
Scale of scalars is the most characteristic feature of SS, but directly producing scalars other than light Higgs boson is difficult.
How to determine scalar mass?
(a) Long-lived gluino as a probe of scalar mass at LHC
orHow to distinguish SS?
(b) Chargino pair production at Linear colliders can probe the properties of chargino S.Y. Choi et.al. (1999) and (2000) and is sensitve to sneutrino mass.Chargino production at LCs
G. Giudice & A. Romanino,
Point Pa: Differential the properties of chargino and Forward-backward Asymmetry
Point Pa: total the properties of chargino
(11), (12) and (22) are all sensitive to sneutrino mass up to 10 TeV for lower M2 and .
Point Pb: Total the properties of chargino
(22) Mode is most promising for higher
Chargino pair production can probe the sneutrino mass up to 10 TeV. Need further simulation!
It provides a very crucial method to distinguish Split from TeV (normal) SUSY.
All three modes (11), (12) and (22) should be analyzed.
Current and planning colliders can’t cover all SS parameter space.Summary for 2nd part
Thanks for your attention! 10 TeV. Need further simulation!