2013eps, search for light higgs and dark photons at babar and belle
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Search for Light Higgs and Dark Photons at BaBar and Belle
Jeri, M.C. Chang, Fu Jen Catholic University
2013/July/19 @EPSHEP2013
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Light Higgs
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charged
neutral CP-even
CP-odd
Positive
NegativeHiggs
Next-to-Minimal Supersymmetric Standard Model (nMSSM)
nMSSM1SUSY
H+
H�
H10 , H2
0 , H30
A10, A2
0
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charged
neutral CP-even
CP-odd
Positive
NegativeHiggs
nMSSM2SUSY
H+
H�
H10 , H2
0 , H30
A10, A2
0
B-Factories
lightest Higgs Energy Conservation, <10 GeV
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⌥b
b̄ �
A0
`�
`+
B-Factories
Directly
in cascades with
e+e� ! ⌥(ns) ! �A0
e+e� ! ⌥(ns) ! ⌥(1s)⇡+⇡�
⌥(1s) ! �A0
(n = 1, 2, 3)
(n = 2, 3)
neutral CP-odd light Higgs
Br ⇠ 10�4proposed by Dermíšek, Gunion, & McElrath in 2007Phys.Rev.D76:051105, 2007
Higgs-Mediated Annihilation
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4 Samples at B factories
⌥(nS) samples > 108, n = 1, 2, 3
No decays.Cleaner samples for
background-limited study.
BB̄
mA0 < 2mb
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Expected A0 Decays5.Phys.Rev.D81:075003, 2010
arXiv:1002.1971[hep-ph]
Radovan Dermisek, John F. Gunion
BR of A0 decaysA0 Mass
nMSSM model parameters
related
related
⌧+⌧�
µ+µ�B Factories
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e+e� ! ⌥(1s) ! �A0
A0 ! ⌧+⌧�with
� ⌥(1s)
e+
e�
A0
⌧+
⌧�
⌫⌧
“1 lepton”
“1 prong”
µ+, e+
⌫µ, ⌫e
⌫̄⌧
µ�, e�
⌫̄µ, ⌫̄e ⌧�
⌫⌧
or
6.1 directly setup ⌧+⌧�
⇡�, ⇢(⇡�⇡0), a1(⇡�⇡0)
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e+e� ! ⌥(1s) ! �A0
A0 ! ⌧+⌧�with
Set Upper Limits on BRPreliminary
Preliminary
6.1 directly results ⌧+⌧�
BF 90%CL UL=4.0x10-6 to 4.5x10-5
3.6 mA0 9.3 GeV
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A0 ! ⌧+⌧�with
�
e+
e�
A0
⌧+
⌧�
µ+
e�
⌫⌧
⌫̄µ
⌫⌧
⌫̄e⌥(2s)
e+e� ! ⌥(2s) ! �A0
“1 lepton”
“1 lepton”
6.2 directly setup ⌧+⌧�
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A0 ! ⌧+⌧�with
e+e� ! ⌥(2s) ! �A0
Preliminary
Set Upper Limits on BR
6.2 directly results ⌧+⌧�
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with
e+
e�
A0
⌥(2s)⌥(1s)
⇡+
⇡�
e+e� ! ⌥(2s) ! ⌥(1s)⇡+⇡�
⌥(1s) ! �A0
�
A0 ! ⌧+⌧�
⌧�
⌧+
arXiv:1210.5669 [hep-ex], submit to PRD
Set Upper Limits on BR
6.3 in cascades resultssetup ⌧+⌧�
BF 90%CL UL= (0.9-13)x10-5
3.6 mA0 9.2 GeV12
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with
e+
e�
A0
⌥(2s)⌥(1s)
⇡+
⇡�
e+e� ! ⌥(2s) ! ⌥(1s)⇡+⇡�
⌥(1s) ! �A0
�
A0 ! ⌧+⌧�
⌧�
⌧+
arXiv:1210.5669 [hep-ex], submit to PRD
6.3 in cascades resultssetup ⌧+⌧�
�b(2P )
Set UL on “Effective Yukawa coupling”xBR
0.09-1.913
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with
e+
e�
A0
⌥(2s)⌥(1s)
⇡+
⇡�
e+e� ! ⌥(2s) ! ⌥(1s)⇡+⇡�
⌥(1s) ! �A0
�
A0 ! ⌧+⌧�
⌧�
e�⌫⌧
⌫̄e
⌧+
µ+⌫⌧
⌫̄µ
Preliminary
Set Upper Limits on BR
6.3 in cascades resultssetup ⌧+⌧�
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with
�
e+
e�
A0
⌥(2s)
e+e� ! ⌥(2s) ! �A0
A0 ! µ+µ�
µ+
µ�
Preliminary
Set Upper Limits on BR
J/ (2S)
6.4 resultssetupdirectly µ+µ�
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PRD 87, 031102(R), 2013with
e+
e�
A0
A0 ! µ+µ�
µ+
µ�⌥(1s)
⇡+
⇡�
⌥(1s) ! �A0
�
e+e� ! ⌥(2s, 3s) ! ⌥(1s)⇡+⇡�
⌥(2s, 3s)
⌥(2s)
⌥(3s)J/
Combined
arXiv:1210.0287
6.5 in cascades resultssetup µ+µ�
BF 90%CL UL= (0.28-9.7)x10-616
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PRD 87, 031102(R), 2013with
e+
e�
A0
A0 ! µ+µ�
µ+
µ�⌥(1s)
⇡+
⇡�
⌥(1s) ! �A0
�
e+e� ! ⌥(2s, 3s) ! ⌥(1s)⇡+⇡�
⌥(2s, 3s)Combined
90% C.L. Upper Limits on “Effective Yukawa coupling”
arXiv:1210.0287
6.5 in cascades resultssetup µ+µ�
(0.29-40)x10-6 mA0 9.2 GeV17
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with
e+
e�
A0
⌥(2s)
A0 ! µ+µ�
µ+
µ�⌥(1s)
⇡+
⇡�
e+e� ! ⌥(2s) ! ⌥(1s)⇡+⇡�
⌥(1s) ! �A0
�
Set Upper Limits on BR
Preliminary
6.5 in cascades resultssetup µ+µ�
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Short Summary for Light Higgs
Set Significant constraints on nMSSM.
Light Higgs
UL on BF@ 90% C.L. ~10-5
UL on BF@ 90% C.L. ~10-6
A0 ! ⌧+⌧�
A0 ! µ+µ�
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Dark Photon
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Experimental anomaliesCan Dark Matter explain observed anomalies in astrophysical data and dark matter experiments?
AMS2 PRL 110, 141102 (2013)
DAMA/LIBRA, Eur. Phys. J. C 56: 333-355 (2008)
positron excess annual modulation
1.
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2. Dark Matter at B Factories?e+
e�
SM✏
DM
A
h’↵D A
A
↵D : dark sector constant
✏ : kinetic mixing
A: Dark Photonh’: Dark Higgs
e+e� ! Ah0 ! AAA
`+
`+
`+
`�
`�
`�
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e+
e�
SM✏
DM
3. Dark Matter at B Factories
AAA ! 3(`+`�)AAA ! 2(`+`�)⇡+⇡�
AAA ! (`+`�)2(⇡+⇡�)AAA ! 2(µ+µ�) +XAAA ! µ+µ�e+e� +X
` = e, µX = any state other than a pair of pions or leptons
Phys. Rev. Lett. 108, 211801 (2012)
A
h’↵D A
A
e+e� ! Ah0 ! AAA
`+
`+
`+
`�
`�
`�
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3. Phys. Rev. Lett. 108, 211801 (2012)
Combine all channels
!, and � regions are excluded to avoid the overflow
cross section U.L.: 10-100 ab
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3. Phys. Rev. Lett. 108, 211801 (2012)
Combine all channels
U.L. @90% CL↵D✏2 U.L. @90% CL↵D✏2
no signal has been observed0.8 GeV < mh0 < 10 GeV0.25 GeV < mA0 < 3 GeV
DM model, predict lower than 10-9 level, not preferred25
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e+
e�
SM✏
DM
e+e� ! Ah0 ! AAA
4. Dark Matter at B Factories
AAA ! 3(`+`�)` = e, µ
Preliminary
AAA ! 3(⇡+⇡�)
AAA ! 2(`+`�)⇡+⇡�
AAA ! (`+`�)2(⇡+⇡�)
AAA ! (e+e�)(µ+µ�)(⇡+⇡�)
AAA ! 2(µ+µ�)e+e�AAA ! 2(e+e�)µ+µ�
10 channels
A
h’↵D A
A
e+e� ! Ah0 ! AAA
`+
`+
`+
`�
`�
`�
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4. 4 channels are openedAAA ! 3(`+`�)
AAA ! 2(µ+µ�)e+e�AAA ! (e+e�)2(⇡+⇡�)
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4. 4 channels are openedAAA ! 3(`+`�)
AAA ! 2(µ+µ�)e+e�AAA ! (e+e�)2(⇡+⇡�)
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4.Combine 4 channels
cross section U.L.: 10-200 preferred
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4.Combine 4 channels
U.L. @90% CL↵D✏2 U.L. @90% CL↵D✏2
0.25 GeV < mA0 < 3.5 GeV 0.5 GeV < mh0 < 10.5 GeV
no signal has been observedDM model, predict lower than 10-9 level, not preferred
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Short Summary for Dark Forces
Set Significant constraints on DM.
Dark HiggsDark Photon
cross section U.L.: 10-100 ab
U.L. : >10-9↵D✏2
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Summary
No significant excess.
Improve current best limits.
Light Higgs
Dark Photon
Dark Higgs
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Thank you very much~
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BaBar results, 2012
Shown at FPCP 2012. Summarized in arXiv:1209.1143 (B. Echenard)
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