1. Miguel A. Sanchis-Lozano*
Upsilon(1S,2S,3S) Super B
Miguel A. Sanchis-Lozano*
*On behalf of the Quarkonium Working Group
Department of Theoretical Physics & IFIC
University of Valencia – CSIC
Spain
Super B V Paris May 9-11, 2007
Miguel A. Sanchis-Lozano IFIC-Valencia

2. Physics potential of Super B for heavy quarkonium
Fundamental tests of hadronic structure and dynamics: spectroscopy,
production and decays of charmonium and bottomonium
- Search for/confirmation of new particles and states: mesons,
baryons, exotics, gluonium… and determination of their nature
(molecular, hybrids, tetraquark…)
- Precise determination of widths and branching fractions (beyond
the few percent level)
Tests of novel nonperturbative and perturbative QCD phenomena,
development of effective theories and lattice QCD
Precise extraction of SM parameters: αs, masses
Search for non-standard particles: from light dark matter (e.g. light
neutralinos) to a light CP-odd Higgs boson showing up in heavy
quarkonium decays
Super B V Paris May 9-11, 2007
Miguel A. Sanchis-Lozano IFIC-Valencia

3. Light neutral Higgs scenarios
Higgs sector in the NMSSM: (seven)
2 neutral CP-odd Higgs bosons (A1,2)
3 neutral CP-even Higgs bosons (H1,2,3 )
2 charged Higgs bosons (H±)
L & H
PQ symmetry or U(1)R slightly broken → a light pseudoscalar Higgs A1
Coupling of A1 to down type fermions:
Light dark matter?
NMSSM candidate:
Light neutralino with a singlet component
The A1 would be the lightest Higgs:
Super B V Paris May 9-11, 2007
Miguel A. Sanchis-Lozano IFIC-Valencia

4. Light Higgs windows at LEP (CPV MSSM)
hep-ex/
hep-ex/
Diagram illustrating the effective coupling of a Higgs
mass eigenstate H1 to the Z. Only the CP-even admixture
h and H couple to Z while the CP-odd A does not: hence
the coupling of the H1 is reduced wrt a CPC scenario.
hep-ex/
CPX MSSM 95% exclusion areas using scans with different values
of arg (At,b). The region excluded by Yukawa searches, Z-width
constraints or decay independent searches is shown in red
CPX MSSM 95% exclusion areas using scans with different
values of the top mass
Super B V Paris May 9-11, 2007
Miguel A. Sanchis-Lozano IFIC-Valencia

5. Mixing of a pseudoscalar Higgs A0 and a b resonance
e+ e-     τ+ τ-
A00 , b0
unmixed states
A0 , b
mixed (physical)
states
Super B V Paris May 9-11, 2007
Miguel A. Sanchis-Lozano IFIC-Valencia

6. Miguel A. Sanchis-Lozano IFIC-Valencia
Mixing(II)
Xd = 10
Xd = 40
broader b
b mass shift
Hyperfine splitting
m-mb
unexpectedly large
b > [b2g]
Super B V Paris May 9-11, 2007
Miguel A. Sanchis-Lozano IFIC-Valencia

7. b resonance Searches for b states over more than 20 years /
No signal found so far!
b resonance /
A0 Higgs boson
Petit bourgeois
Enfant terrible
Entangled both theoretically and experimentally?
Super B V Paris May 9-11, 2007
Miguel A. Sanchis-Lozano IFIC-Valencia

8. Expected LU breaking Xd=10, b0 = 5 MeV
Green line: non-resonant decay
Black line: resonant decay
Red line: sum
Xd=10, b0 = 5 MeV
Super B V Paris May 9-11, 2007
Miguel A. Sanchis-Lozano IFIC-Valencia

9. Proposal of testing lepton universality (to the percent level) @ a (Super) B factory
With the machine sitting on the (3S) Final state & BF
(3S)  π + π - (1S,2S) → +  π + π - + -
BF  2-4 x BF  2 x BF  x 10-4
(3S)  π + π - (1S,2S) →  +  π + π - l + l -
BF   +  - → l + l - X, l = e,  BF  x 10-5
(3S)  +  +  -
BF  2 x BF  2 x 10-2
(3S)   +  l + l - X
→ l + l - X, l = e,  BF  2 x 10-3
With the machine sitting on the (4S)
(4S)  π + π - (1S,2S) → +  π + π - + -
BF  BF  2 x BF  2 x 10-6
(4S)  π + π - (1S,2S) →  +  π + π - l + l - X
BF   +  - → l + l - X, l = e,  BF  2 x 10-7
Compare
rates
Compare
rates
Statistical error ≈ 0.07 / √ # fb-1
Systematic error ≤ 0.037
Compare
rates
Super B V Paris May 9-11, 2007
Miguel A. Sanchis-Lozano IFIC-Valencia

10. Miguel A. Sanchis-Lozano IFIC-Valencia
Summary
Very interesting QCD program to be Super B:
new states, precise measurements, novel phenomena...
complementing theoretical developments: effective theories,
Lattice QCD...
QWG Actions items under preparation
What if...
There exists a light Higgs-like particle?
A high luminosity B factory is the ideal place to discover/study it
MERCI
Super B V Paris May 9-11, 2007
Miguel A. Sanchis-Lozano IFIC-Valencia