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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

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slide1

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

Anomaly indicates right-handed charge current?

slide2

Two destinations of puzzles

1: Puzzles stand for new dynamics

  • Speed of light as constant
  • - puzzle
  • Sun neutrino missing

2: Puzzles stand for ignorance (both theoretical and expt.)

  • CDF di-jet
  • Re() in K-system
  • b-inclusive production
slide3

ADL final

O prel.

Anomaly mainly comes from L3

slide5

3-sigma anomaly of W->tau nu is especially interesting and important:

In SM involved is only pure left-handed charge current

Simpler kinematics and less hadronic uncertainties.

slide6

Possible explanations in new physics beyond the SM:

Oblique-type corrections -> NO!

Flavor-dependent interaction!

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

Positive!

slide7

2-Higgs doublet model (2HDM)

Negative except for near-degenerate Higgs mass case:

Lebedev etal., PRD62(2000)055014

slide8

MSSM

Use FeynArts, FormCalc, LoopTools to scan parameter space

In most cases, delta_new is negative

In all cases

slide12

Anomaly in 2HDM and MSSM

  • It is hard to account for anomaly in two models.
  • And it is even harder to account for both W anomaly

and neutral data.

slide14

Constraints from tau-decay data

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.

PDG(2004)

slide15

Allowed small regions at 95% CL

dR: 0-> 0.12

dL: 1-> 1.005

slide16

Anomalous left- and right-handed couplings for

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

?

slide17

Summary for 1st part (questions)

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)

part ii distinguishing split from te v normal susy at ilc hep ph 0407072 plb604 207 2004

Part II:Distinguishing Split from TeV (normal)SUSY at ILChep-ph/0407072, PLB604,207(2004)

朱守华

Shou-hua Zhu

Peking University

July [email protected] Tsinghua Univ.

outline
Outline

Why Split SUSY (SS)?

How to distinguish SS from TeV SUSY?

Chargino pair production at Linear colliders

Summary

why split susy i
Naturalness problem in the SM

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)
slide22

Akani-Hamed,

Pheno2005

slide26

Shortcomings of TeV SUSY

      • not yet found Higgs  small hierarchy problem (remind: in MSSM at LO mH<MZ)
      • excess flavor and CP violation =>”CP problem”
      • fast dim-5 proton decay etc.
slide27

Seems MNew Physics >>TeV, did we miss something important? Is that possible that naturalness …?

slide29

Akani-Hamed,

Pheno2005

slide30

Fine tuning =>

  • God
  • mechanisms

Assuming UNKNOWN mechanism for finely tuned CC is also applied to Higgs sector…

slide31

GUT and Dark Matter instead of Naturalness are guiding principles  Split Supersymmetry

N. Arkani-Hamed &S. Dimopoulos, hep-ph/0405159

  • Split Supersymmetry can get

(a) GUT ( slightly improved)

(b) Dark Matter density

(c) higher Higgs mass (120~160 GeV)

(d) cures to most of TeV SUSY diseases etc.

slide32

Akani-Hamed,

Pheno2005

what is split susy
SS has only 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?
how to distinguish ss
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

or

How to distinguish SS?
chargino production at lcs
(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
ss parameter space mixed region
SS Parameter Space & Mixed Region
  • Assuming gaugino mass unification and dark matter constraint:

0.094 <DMh2<0.129

G. Giudice & A. Romanino,

hep-ph/0406088

slide38

Point Pa: total 

(11), (12) and (22) are all sensitive to sneutrino mass up to 10 TeV for lower M2 and .

slide39

Point Pb: Total 

(22) Mode is most promising for higher

M2 and.

summary for 2nd part
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
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