Detecting Higgs Bosons within Supersymmetric Models

Transcription

1 Detecting Higgs Bosons within Supersymmetric Models Yili Wang University of Oklahoma C. Kao and Y. Wang, Phys. Lett. B 635, 3 (26) 1

2 Outlook of the Talk MSSM has two Higgs doulets. After symmetry reaking, there are five Higgs osons, three neutral Higgs osons: scalars h, H and pseudoscalar A Two free parameters : m A and tanβ We concentrate on Higgs search in three models: minimal SUSY model (MSSM) minimal supergravity model (SUGRA) non-universal Higgs masses within SUGRA 2

3 MSSM Higgs couplings to ottom quark h H A igm 2m W igm 2m gm 2m W W sin cos cos cos 5 tan larger tanβ, larger coupling Same coupling hold for φl + l - except m m l LHC has great potential to discover + neutral Higgs osons - from 3

4 Direct search Direct searches at LHC pp pp tanβ small g + gg + X + + tanβ ig X More promising channel. pp + + X gg 4

5 g Direct search One high p T ottom quark associated with Higgs Dominant: pp + X X Physics ackground: gg + W W + qq W W g and g W ± + ± + pp j + X 5

6 Indirect Search in B S + - Loop diagrams: Gluinos, Charginos Charged Higgs Neutrilinos Indirect search if tanβ is large, these may give ig contriutions 6

7 Indirect search B S + Amplitude tan 3 β,, 1/m 2, A 1/m 2 H Two of tan 3 β come from down type squark and lepton Yukawa couplings, the last arises from the offset etween Yukawa coupling matrix and mass matrix SM ranching ratio is very small BR(B + s ) Experimental upper limit (CDF) BR(B + s ) < Good channel to discover a muon pair from Higgs. 7

8 MSSM + - ) Br(B S tanβ M SUSY M A M A SUSY = 35 GeV M SUSY = 1 GeV 8

9 MSSM M SUSY = 35 GeV, µ > M SUSY = 1 GeV, µ > tanβ X1-7 3X1-8 1X1-8 3 f -1 3 f -1 5X1-9 tanβ X1-7 1X1-8 3X1-8 3 f -1 3 f -1 5X M A φ 5σ contour is larger than B s in 3x1-8 m SUSY = -A f M A φ 5σ contour is close to B s in 1x1-8 9

10 msugra SUSY is roken in hidden sector and communicated to oservale sector y gravitational interactions Parameters: common scalar mass m gaugino mass m 1/2 Trilinear coupling A sign of ( ) Ratio of Higgs vacuum expectation value tanβ m, m 1/2, A, 1/2 tan, sgn( ) 1

11 msugra m 2 15 tanβ = 2, A =, µ > m χ1 ± < 13.5 GeV m 2 15 tanβ = 5, A =, µ > 5X f X1-8 3 f -1 3 f X X1-7 χ 1 not LSP χ 1 not LSP m 1/2 m 1/2 Large tanβ does greatly increase the detecting region tanβ 5, Br(B S ) is complementary with φ at L = 3 f-1 11

12 Non-universal SUGRA At GUT scale, Higgs masses are not universal m i (GUT) = (1 + 2 H (GUT) (1 i )m Non-universal Higgs masses at the GUT scale affect weak-scale Higgs masses significantly. 1 2 < >,, GUT Scale m m H H 1 2 decreases increases 2 m m Weak Scale A H smaller smaller 12

13 m case I 2 15 Non-universal SUGRA 1 =.5, 2 = tanβ = 2, δ 1 = -.5, δ 2 = m χ1 ± < 13.5 GeV m 2 15 tanβ = 5, δ 1 = -.5, δ 2 = 3f -1 3f -1 5X f X1-7 3X1-8 1X1-8 χ 1 not LSP χ 1 not LSP m 1/2 m and m A H are smaller than those in msugra Both φ μμ and B S will cover larger region. m 1/2 13

14 m Non-universal SUGRA case II 1 =, 2 = tanβ = 2, δ 1 =, δ 2 =.5 m 2 15 tanβ = 5, δ 1 =, δ 2 =.5 3 f -1 5X X1-8 3 f f X X1-7 χ 1 not LSP χ 1 not LSP m 1/2 tanβ 5, φ μμ at L = 3 f -1 is comparale with Br(B S ) 1x1-8 m 1/2 14

15 m case III 2 15 Non-universal SUGRA tanβ = 2, δ 1 = -.5, δ 2 =.5 1 =.5, 2 = m tanβ = 5, δ 1 = -.5, δ 2 = f X1-7 3 f -1 3 f -1 1X1-8 3X1-8 5X1-9 χ 1 not LSP χ 1 not LSP m 1/2 m 1/2 theoretically favored region shrinks with δ =

16 Conclusion In SUSY models, muon pair discovery channels offer great promise for detecting Higgs, in oth direct and indirect searches. large tanβ does enhance the Higgs oson detection dramatically. In MSSM, if M SUSY ~ 1 TeV, φ at L = 3 f-1 is comparale with Br(B S ) 1x1-8, M SUSY ~ 35 GeV φ ecomes more promising than B S If tanβ 5, Br(B S ) is complementary with φ at L = 3 f - 1 in msugra, ut in non- universal SUGRA, Br(B S ) is eyond the region of φ at L = 3 f -1 16