The Higgs sector in U ( 1 ) extensions of the MSSM Jonathan Da Silva - - PowerPoint PPT Presentation
The Higgs sector in U ( 1 ) extensions of the MSSM Jonathan Da Silva Laboratoire dAnnecy-le-Vieux de Physique Th eorique, France Higgs Hunting, LAL, Orsay, July 25, 2013 G. B elanger, J. Da Silva and A. Pukhov, in preparation Jonathan
Jonathan Da Silva
Laboratoire d’Annecy-le-Vieux de Physique Th´ eorique, France Higgs Hunting, LAL, Orsay, July 25, 2013
elanger, J. Da Silva and A. Pukhov, in preparation Jonathan Da Silva (LAPTh) The Higgs sector in the UMSSM LAL, July 25, 2013 1 / 18
Outline
1
Introduction
2
The model
3
Constraints
4
Results
5
Conclusions
Jonathan Da Silva (LAPTh) The Higgs sector in the UMSSM LAL, July 25, 2013 2 / 18
Introduction
1
Introduction
2
The model
3
Constraints
4
Results
5
Conclusions
Jonathan Da Silva (LAPTh) The Higgs sector in the UMSSM LAL, July 25, 2013 3 / 18
Introduction
✷ In the MSSM, for TeV-scale values of the SUSY–breaking scale MS : SM-like Higgs boson mass ≈ 125 GeV + very small tan β, i.e. ≈ 1 ⇒ tricky ⇒ Higgs boson mass of 125 GeV requires large tan β
Jonathan Da Silva (LAPTh) The Higgs sector in the UMSSM LAL, July 25, 2013 4 / 18
Introduction
✷ In the MSSM, for TeV-scale values of the SUSY–breaking scale MS : SM-like Higgs boson mass ≈ 125 GeV + very small tan β, i.e. ≈ 1 ⇒ tricky ⇒ Higgs boson mass of 125 GeV requires large tan β ✷ In singlet extension (e.g. NMSSM) mh ≈ 125 GeV can be achieved with tan β ≈ 2
Jonathan Da Silva (LAPTh) The Higgs sector in the UMSSM LAL, July 25, 2013 5 / 18
The model
1
Introduction
2
The model
3
Constraints
4
Results
5
Conclusions
Jonathan Da Silva (LAPTh) The Higgs sector in the UMSSM LAL, July 25, 2013 6 / 18
The model
✷ Symmetry group : SU(3)c × SU(2)L × U(1)Y × U′(1) Coupling constants : g3, g2, gY and g′
1 =
3 gY
✷ U′(1) stems from string-inspired E6 : E6 → SU(3)c × SU(2)L × U(1)Y × U(1)χ × U(1)ψ ⇒ U′(1) charge : Q′ = cos θE6Q′
χ + sin θE6Q′ ψ,
θE6 ∈ [−π/2, π/2] ✷ MSSM fields + RH (s)neutrinos + new gauge boson (gaugino) + new singlet (singlino) + O(TeVs) Q′
Q
Q′
u
Q′
d
Q′
L
Q′
ν
Q′
e
Q′
Hu
Q′
Hd
Q′
S
√ 40Q′
χ
−1 −1 3 3 −5 −1 2 −2 √ 24Q′
ψ
1 1 1 1 1 1 −2 −2 4 ✷ Superpotential : WUMSSM = WMSSM|µ=0 + λSHuHd + ˜ ν∗
Ryν
LHu + O(TeVs) ✷ As the NMSSM, this model solves the µ problem : µ = λ vs
√ 2
✷ Higgs sector : MSSM fields + 1 singlet ⇒ 3 CP-even Higgs bosons hi, i ∈ {1, 2, 3} New D-terms for the SM-like Higgs boson : m2
h1 ≤ M2 Z cos2 2β + 1 2λ2v2 sin2 2β + g′2 1 v2(Q′ Hd cos2 β + Q′ Hu sin2 β)2 + ∆m2 h Jonathan Da Silva (LAPTh) The Higgs sector in the UMSSM LAL, July 25, 2013 7 / 18
The model
✷ Gauge sector : Physical abelian gauge bosons : Z1 and Z2, mixing between the Z
✷ Gauginos sector : 6 neutralinos in the basis ( B, W3, H0
d,
H0
u,
S, B′) ✷ To sum up :
Jonathan Da Silva (LAPTh) The Higgs sector in the UMSSM LAL, July 25, 2013 8 / 18
Constraints
1
Introduction
2
The model
3
Constraints
4
Results
5
Conclusions
Jonathan Da Silva (LAPTh) The Higgs sector in the UMSSM LAL, July 25, 2013 9 / 18
Constraints
✹ Z′ heavy ⇒ heavy singlet-like Higgs boson ⇒ h2 mostly doublet-like
ATLAS Collaboration, http ://cds.cern.ch/record/1525524 Jonathan Da Silva (LAPTh) The Higgs sector in the UMSSM LAL, July 25, 2013 10 / 18
Constraints
✹ Z′ heavy ⇒ heavy singlet-like Higgs boson ⇒ h2 mostly doublet-like ✹ DM observables for either neutralino or RH sneutrino DM candidate ✹ mh1 ∈ [120.63, 130.63] GeV ✹ Higgs boson signal strengths and low energy observables ⇒ Modification of the NMSSMTools code : UMSSMTools Observable Value B(B± → τ ±ντ) (0.99 ± 0.25)× 10−4 UTfit B(B0
s → µ+µ−)
(2.95 + 0.74
− 0.67)× 10−9 LHCb + CMS
∆Ms 17.719 ± 0.043 ps−1 HFAG ∆Md 0.507 ± 0.004 ps−1 HFAG B(¯ B0 → Xsγ) (3.55 ± 0.24 ± 0.09)× 10−4 HFAG Parameter Range Parameter Range m˜
νR
[0.05, 2] TeV Aλ [0, 4] TeV MZ2 [2.2, 7] TeV At, Ab, Aτ [-4, 4] TeV αZ [-10−3, 10−3] rad m˜
Q3, m˜ u3, m˜ d3, m˜ L3, m˜ e3
[0, 2] TeV θE6 [-π/2, π/2] rad µ, M1, M′
1
[0.1, 2] TeV
Jonathan Da Silva (LAPTh) The Higgs sector in the UMSSM LAL, July 25, 2013 11 / 18
Results
1
Introduction
2
The model
3
Constraints
4
Results
5
Conclusions
Jonathan Da Silva (LAPTh) The Higgs sector in the UMSSM LAL, July 25, 2013 12 / 18
Results
✷ tan β ≈ 1 + TeV-scale MS ⇒ expected mh1 : large contribution from pure UMSSM as well as one-loop stop terms
Jonathan Da Silva (LAPTh) The Higgs sector in the UMSSM LAL, July 25, 2013 13 / 18
Results
✷ Important UMSSM contribution to sfermion mass (dependent on θE6) : ∆f = 1
2 g′ 1 2Q′ f(Q′ Hdv2 d + Q′ Huv2 u + Q′ Sv2 s )
⇒ Condition on neutral LSP put strong constraints on θE6
Jonathan Da Silva (LAPTh) The Higgs sector in the UMSSM LAL, July 25, 2013 14 / 18
Results
✷ Higgs signal strength mostly compatible with current limits (here using G. Belanger et al, arXiv :1306.2941)
Jonathan Da Silva (LAPTh) The Higgs sector in the UMSSM LAL, July 25, 2013 15 / 18
Results
✷ Prospects for h2 searches
Jonathan Da Silva (LAPTh) The Higgs sector in the UMSSM LAL, July 25, 2013 16 / 18
Conclusions
1
Introduction
2
The model
3
Constraints
4
Results
5
Conclusions
Jonathan Da Silva (LAPTh) The Higgs sector in the UMSSM LAL, July 25, 2013 17 / 18
Conclusions
✷ Discovery (Higgs boson), bounds (exotic particles, DM) ⇒ strong constraints on the UMSSM ✷ New D-terms ⇒ low tan β values still allowed for TeV-scale MS ✷ Second Higgs doublet can be search for at LHC (when not too heavy, i.e. 1 TeV)
Jonathan Da Silva (LAPTh) The Higgs sector in the UMSSM LAL, July 25, 2013 18 / 18
Conclusions
✷ Discovery (Higgs boson), bounds (exotic particles, DM) ⇒ strong constraints on the UMSSM ✷ New D-terms ⇒ low tan β values still allowed for TeV-scale MS ✷ Second Higgs doublet can be search for at LHC (when not too heavy, i.e. 1 TeV)
Jonathan Da Silva (LAPTh) The Higgs sector in the UMSSM LAL, July 25, 2013 18 / 18
BACKUP
Jonathan Da Silva (LAPTh) The Higgs sector in the UMSSM LAL, July 25, 2013 18 / 18
BACKUP
Jonathan Da Silva (LAPTh) The Higgs sector in the UMSSM LAL, July 25, 2013 18 / 18