B-meson anomalies & Higgs physics in flavored U(1) model

Transcription

1 B-meson anomalies & Higgs physics in flavored U(1) model Hyun Min Lee Chung-Ang University, Korea L. Bian, S.-M. Choi, Y.-J. Kang, HML, Phys. Rev. D96 (2017) ; L. Bian, HML, C.B. Park, arxiv: IBS-KIAS Joint Workshop High 1 resort, January 7-13, 2018

2 Outline Motivation Minimal flavored U(1) Flavor violation from extra Higgs Higgs production at LHC Conclusions

3 FCNC in SM Charged currents induce flavor violating processes at tree level, while FCNCs are induced at loop level. FCNC processes are sensitive probes to a violation of lepton flavors & universal interactions, due to new physics.

4 B-anomalies at LHCb B +! K + l + l B 0! K 0 l + l 1 GeV 2 <q 2 < 6 GeV 2 lepton flavor RK: 2.6σ deviation; RK*: σ deviation and σ deviation. non-universality?

5 Distributions of B-decays B 0! K 0 µ + µ Differential branching fractions & angular distribution are consistently lower than the SM values.

6 Belle II for B-anomalies [Philip Urquijo, SUSY 2017 Plenary] Belle II can test LFUV in B-meson decays to few % with data of 5 ab -1.

7 EFT for B-decays SM: Penguins Box Effective Hamiltonian for b sl + l - : New physics contributions encoded in Wilson coefficients:

8 Global fits [Capdevila et al, 2017] [D Amico et al, 2017] % % % ~ 5σ from SM! QCD? ~ 4σ or less [Ciuchini et al, ; Hurth et al, ]

9 More violation of LFU? B D (*) τν 4σ anomalies in B D (*) τν decays from BaBar, Belle and LHCb.

10 New physics for RK ( ) New physics for B-meson anomalies: Flavor-violating U(1) Leptoquarks New scalars/fermions in loops this work [Review: D Amico et al, ]

11 Minimal flavored U(1)

12 Flavored U(1) Anomaly-free U(1) with SM fermions only: flavor non-universal Anomaly-free U(1) with 3 right-handed neutrinos: flavor-dependent with one right-handed neutrino per each generation Flavored U(1) for B-meson anomalies U(1) charges [L. Bian, S.-M. Choi, Y.-J. Kang, HML, 2017] 1R : neutral RH2 RH3 Scalar sector

13 B 3 -L3 from clockwork [U(1) B-L ] N+1 clockwork with third family localized at different sites from first two families. A 0 A 2 µ A 1 µ µ A N µ 2 A N µ 1 A N µ 0 1 N 2 N 1 [Giudice, McCollough, 2016; HML, 2017] [U(1) B L ] N+1 h i i = 1 p 2 f U(1) B3 L 3 : unbroken U(1) + U(1) Lµ L : LFUV profile of unbroken U(1) 3rd family j =0 1 2 N 1 N 1st, 2nd Family

14 B-meson anomalies Z interactions in interaction basis: Flavor violation in physical basis:, Bottom-quark transition induced by CKM mixings.

15 } Bounds on quark couplings Quark couplings: xg Z 0 Meson mixing and decays: s B 0 s } B 0 s s b LHC dimuon searches: + b xg Z 0 b xg Z 0 g b etc, : additional signatures of the model.

16 Bounds on lepton couplings Lepton couplings: yg Z 0 Tau decays Neutrino trident production < (2 ) < 1.45(2 ) m Z 0 yg Z 0 > 554 GeV.

17 Z Decay BR (L µ L ) like

18 Bounds on Z mass Lepton couplings gz 'y σ(pp Z')xBR(Z' μ + μ - )(fb), m Z' =500GeV τ-decay ν-trident 1fb (g-2) μ C μ 9 dimuon 5fb Quark couplings 10fb g Z' x gz'x σ(pp Z')xBR(Z' μ + μ - )(fb), g Z' y=1 B s Bs (g 2) µ 30fb decay trident 10fb 5fb 2fb 1fb C μ 9 0.1fb m Z' (GeV) dimuon LHC dimuon constrains B charges much smaller than L charges; tau decay/neutrino trident searches are complementary.

19 Flavor violation from extra Higgs

20 Quark mixing Two Higgs doublets H1, H2 needed for quark mixing: Flavor-Violating couplings fixed only by tanβ: down-type: up-type: unitarity

21 Quark Yukawa couplings Neutral Higgs bosons: b-quark flavor violating [Crivellin et al, 2015; L. Bian, HML, C.B. Park, 2017] no flavor violation in top SM Higgs if 2HDM-I like H-t-t reduced

22 Quark Yukawa couplings Charged Higgs boson: b-quark flavor violating 2HDM-I like H - t-b reduced

23 Lepton mixing SM lepton matrices diagonal 2HDM-I like Three singlet scalars Φ1,2,3 for RH neutrino masses correct neutrino masses and mixings from RH neutrino masses [Fritzsch et al, 2011]

24 Extra Higgs bosons [L. Bian, HML, C.B. Park, 2017] Scalar potential with two Higgs doublets H1, H2 and singlet S v 1,2 = p 2hH 1,2 i; v s = p 2hSi SSB of electroweak and U(1) (Extra singlet VEVs determine Z mass) Extra scalars mix with SM Higgs and themselves. CP-even: CP-odd: Charged Higgs:

25 Higgs data and unitarity unitarity Higgs data fit unitarity unitarity Lower bounds on tanβ from Higgs mixing & unitarity. Upper bounds on tanβfrom EW data:

26 B-physics bounds unitarity unitarity B! X s B Xsγ } Bounds on neutral Higgs masses: m H m A cf. EW data Bounds on charged Higgs mass Anomalies in RD are not accommodated in our model. ( )

27 Higgs production at LHC

28 Neutral Higgs production Gluon fusion b-quark fusion Standard channels for single Higgs production b-quark associated production [Altmanshofer et al, 2016; L. Bian, HML, C.B. Park, 2017] New d,s-fusion contributions

29 Neutral Higgs production e.g., b b!h/ gg!h =0.39 g-fusion dominant

30 Neutral Higgs decays m H. 2m h : bd + bs dominant dijet (b-jet) bounds m H & 2m h : hh dominant Resonant di-higgs production

31 LHC limits + ISR jet g-fusion dominant: ISR photon limit does not apply. Heavy Higgs searches do not have enough sensitivity for our model yet.

32 Charged Higgs production b : Standard channels for charged Higgs H b H b t t t u i, : New u,c-fusion contributions u i [L. Bian, HML, C.B. Park, 2017] H + H + u i b

33 Charged Higgs production Flavor-violating production is comparable to standard one and it can be dominant for small tanβ.

34 Charged Higgs decays m H ± & m W + m h 225 GeV : m H ±. 225 GeV : tb dominant smoking gun signal no constraints from LHC yet!

35 Conclusions B-meson anomalies can be explained due to anomalyfree U(1) interactions with heavy flavors. Z -couplings in our model are constrained by meson mixing/decays & LHC dimuon searches as well as tau decays and neutrino trident production. Flavor violating couplings to bottom quark and modified Yukawa coupling to top-quark lead to new production and decay channels for heavy Higgs bosons have at LHC. Smoking-gun signatures for LHC are dijet (w/ b-jet) and hh for neutral heavy Higgs and b+wh for charged Higgs.