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1 Effects of New Physics on CP violation in B decays July 17, 2003 HEP2003, Aachen.

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Presentation on theme: "1 Effects of New Physics on CP violation in B decays July 17, 2003 HEP2003, Aachen."— Presentation transcript:

1 1 Effects of New Physics on CP violation in B decays July 17, 2003 HEP2003, Aachen

2 17 July, HEP2003George W.S. Hou 2 Outline b ⇄ s Phenomena: Current Frontier for NP Flavor Models w/ 1 Extra CP Phase in b ⇄ s 4th Generation Large s R -b R Mixing w/ SUSY: Light Squark 4th Generation & b → s ℓ + ℓ −,  m B s, sin2  B s — Does Not Touch EM/Strong Penguins Much Light and S  K s, S  ’K s,  m B s, sin2  B s Survive b → s  Tune for S  K s, S  ’K s Possible Consequences:  m B s, sin2  B s, wrong  helicity Conclusion Based on A. Arhrib and WSH, EPJC 27, 555 (2003) A. Arhrib, C.K. Chua and WSH, PRD 65, 017701 (2001) C.K. Chua, WSH and M. Nagashima, to appear

3 17 July, HEP2003George W.S. Hou 3 Present b ⇄ s Phenomena: Current NP Frontier CP Phase sin2  B d ≅ 0.8 Agree with CKM Fit but  3 ≅ 60 ∘ CKM Fit v.  3 ~ 90 ∘ B → K  /  Modes Although sin2  B d →  ’K s ≅ sin2  B d but sin2  B d →  K s Opposite Sign !? b → s ℓ + ℓ − > SM?  m B s “Just Around the Corner ” but if sin2  B s ≠ 0 ➯ NP b → s  L ? Wrong Helicity Component? Test via B s →    Mixing-dep CPV  b →     Polarization (Near) Future

4 17 July, HEP2003George W.S. Hou 4 4th Generation: In general 3 New CP Phases Restrict to b ⇄ s Only: Just One New CP Phase Phase  s Neglected in Literature ! Large s R -b R Mixing w/ SUSY: Light Squark Just One New CP Phase Models w/ 1 Extra CP Phase in b ⇄ s  Flavor-driven Light s-b Flavored Squark Flavor Symmetry ⊕ Supersymmetry

5 17 July, HEP2003George W.S. Hou 5 4th Generation 4th Generation Effect Formalism Take Hamiltonian for b → s  Phase  s has been Neglected in Literature usual term Satisfies GIM Parameters ≅ −0.04 ~ 0.0006

6 17 July, HEP2003George W.S. Hou 6 b → s ,  m B s Complementary - b → s  Weak m t’ –dep ➯ Not So Constraining -  m B s Strong m t’ –dep ➯ Not Constructive Interf.  s =  /,  /  s =  /2, 3  /2 Most Forgiving ∵ Add in quadrature Constraints: b → s ,  m B s Expt. dashed: b → s , solid:  m B s Choose param. ➯ SM Values

7 17 July, HEP2003George W.S. Hou 7 Constraint/Test: b → s ℓ + ℓ − Rate EW Penguin has Strong m t’ –dep., Just Like B s Mixing Yet to Settle (a bit high) SM ~ NNLO SM3 ~ (0.8−1.7) x 10 -6 ~ (0.5−0.8) x 10 -6 Less hadronic uncertainty Maybe high vs. NNLO More Stringent than  m B s Improve Soon ➯ Improve Soon !  s ~  /,  /  s ~  /2, 3  /2 r s Allow Larger r s May be Needed If NNLO Remains Low No Further Info in m 2 (ℓℓ) Constrained by BR ➯ A FB ~ SM

8 17 July, HEP2003George W.S. Hou 8 sin 2  B d Agree with SM3, but May be Affected by Any sin 2  B s ≠ 0 Implies NP !! sin 2  B s = 0 Strictly in SM3 ➯ Any sin 2  B s ≠ 0 Implies NP !! The Highlight: Large sin2  B s ≠ 0 Def. A, B, C are quadratic fns of m t, m t’ 250 GeV 350 GeV rsrs rsrs 0.02 0.01 0.002 0.005 0.004 0.002 r s Even for Small r s sin 2  B s sin 2  B s Can be Large Both Signs Possible Largest If  m B s “Just Around Corner”  s ~  /,  / i.e. when  s ~  /2, 3  /2  m B s Quite Measurable sin 2  B s ~ ± 1 Good at Tevatron !

9 17 July, HEP2003George W.S. Hou 9 But, … 4th Generation Not Effective on EM & Strong Penguins b → s  affected only when r s (and m t’ ) gets large No Mixing CPV because (L) Chirality Same as SM b → sg* Even Less Affected ➯ Cannot Touch S  K s, S  ’K s etc. Turn to one that Can

10 17 July, HEP2003George W.S. Hou 10 Light Light & S  K s, S  ’K s,  m B s, sin2  B s Abelian Flavor Symmetry Commuting Charges Nir-Seiberg, PLB’93; Leurer-Nir-Seiberg, NPB’94 Prominent but right-handed N.B. Need 4 Texture Zeros (Chua-WSH, PRL’01) : Set [..] = 0 Arhrib-Chua-WSH, PRD’01 Decouple d flavor Mass/Mixing Hierarchy Alternative Picture: Chang, Masiero, Murayama

11 11 Right-handed Quarks Inert in SM S  Right-handed Squarks SUSY Assume RR Sector Impact b ⇄ s SUSY thru SUSY also important

12 17 July, HEP2003George W.S. Hou 12 Level Splitting by Large Mixing  Drive One State Light 100 GeV Possible 1 CP Phase Focus on 200 GeV

13 17 July, HEP2003George W.S. Hou 13 Rates B →  K s,  ’K s Rates More Conservative Survive b → s  Constraint Cannot Account of  ’K s Rate  K s Rate also a bit Low But, Not New Problems

14 17 July, HEP2003George W.S. Hou 14 A Little Note on Formalism … Besides O 1,2 Tree O 3-6 Strong Penguin O 7-10 EM/EW Penguin also O 11,12  /g Dipole

15 17 July, HEP2003George W.S. Hou 15 Tune for S  K s, S  ’K s Possible S  K s S  K s ≲ 0 prefers lower  -plane S  ’K s ➯ S  ’K s ≅ sin2  B d as well ! S  K s Lower gluino mass lowers S  K s Hadronic Parameters CP phase enters B →  K s via Lower q 2, larger S  K s ➯ Larger | S  K s | If B →  ’K s rate due to (SM) S  ’K s QCD Effect ➯ S  ’K s drops a bit Could  ≃ 3  /2 be it? noticed also by Khalil & Kou Murayama et al.

16 17 July, HEP2003George W.S. Hou 16  m B s, sin2  B s Consequences:  m B s, sin2  B s Take  ≃ 3  /2 as example 800 GeV gluino “preferred”  m B s ~ 20-40 ps -1 -  m B s ~ 20-40 ps -1 “Easy” sin2  B s ~ −1 - sin2  B s ~ −1 Super Lighter gluino at 500 GeV  m B s > 60 ps -1 -  m B s > 60 ps -1 Tougher sin2  B s ~ −1 - 0 - sin2  B s ~ −1 - 0 For lighter gluino, periodicity change ∵ a -term dominant (two exch.) 100 GeV 100 GeV ~ 200 GeV case Direct Detection ! Except, Direct Detection !

17 17 July, HEP2003George W.S. Hou 17 Strength of Mixing-dep. CPV B s →  in, e.g. B s →   L Test  L component (Atwood, Gronau, Soni, 1997) (Atwood, Gronau, Soni, 1997)  L Can also test  L comp. via  Polarization in  b →    (Mannel, Recksiegel, 1997) (Mannel, Recksiegel, 1997) Wrong Helicity Photon in b → s  L More: Wrong Helicity Photon in b → s  L All Testable at Tevatron and Beyond and Beyond

18 17 July, HEP2003George W.S. Hou 18 Conclusion New CP Phase Impact of 4th Generation (Emphasized New CP Phase) B s Mixing & CPV Prominent in - B s Mixing & CPV - EW b → s Penguin Mild in EM/Strong Penguin A Light Flavor-mixed Squark? Survive b → s  S  K s S  ’K s Can Account for S  K s, S  ’K s  m B s sin2  B s  L Strong Impact on:  m B s, sin2  B s, b → s  L ➯ Study at B Factories, Tevatron, and …


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