Search for Charged Higgs Production Associated with W boson with the ILD at the ILC Akimasa Ishikawa for Yuko Shinzaki (Tohoku University) Jan Strube, Hitoshi Yamamoto, Keisuke Fujii A, Shinya Kanemura B, Kei Yagyu C Tohoku, KEK A, Toyama B, Southampton C

Introduction Charged Higgs bosons can exist in the extended Higgs models. 2HDM Higgs Triplet models Explains neutrino mass Georgi-Machacek model Real Y=0 and complex Y=1 triplet Higgs fields Additional 3 and 6 physical higgs bosons  = 1 at tree level Which can have HWV coupling One loop in 2HDM Tree level in triplet models Effective Lagrangian can be expressed in terms of form factor f HWV which can be constrained from the e + e -  W + H - search and can be used for model discrimination

Condition for the Simulation Full Simulation Process : e + e -  WH f HWZ = 1 and f HW  =0 Only couples to Z Decay : H   or H  W ( * ) Z ( * )  l Ecm = 250GeV M H+ = 150GeV Pair production very suppressed Almost maximal cross sections L int = 250fb -1 P(e-,e+) = (+0.8, - 0.3) Right handed to suppress WW backgrounds

Dominant Backgrounds Irreducible WW  jjl e W  enjj Reducible ZZ  jjll Large Cross section Di-jet

Cross Section ProcessCross section (fb)Events (k) Sig ① WH (H  τν)21454 Sig ② WH (H  WZ)21454 SM BG Di-jet eνW  eνjj WW  jjlν ZZ  jjll WW  jjjj Zee  jjee30074 ZZ  jjjj ZZWWmix  jjjj Zh  ffh20551 Dominant background

Reconstruction Forced three jet analysis with Durham (somewhat inclusive) Final states for both channels are di-jet and lepton with missing energy W boson mass with  2 Recoil mass

HH

W mass and Recoil Mass cut < Mrec < 190 (GeV) cut Signal < Mw < 90 (GeV)

Transverse Momentum Suppress neutrinoless processes 15 < total Pt (GeV) cut Signal

Visible Energy Suppress neutrinoless processes Evis < 170 (GeV) cut

Production angle of W boson Suppress dijet cut 0.95 < | cosθ Wangle |

BDT inputs Input variables Y23, thrust, nPFO, No of charged, Missing mass, max(E PFO )/E 3jet Y23nPFO(3 rd jet) No of charged Missing mass thrust

BDT output Keeping 70% signal while reducing 80% backgrounds <BDTG

Cut-flow Table for H +   WH(τν)Di-jeteνW  eνjjWW  jjlνZZ  jjllothers no cut m w &m rec pt Evis Wangle BDTG

Recoil mass distribution for H +   Efficiency 26.6% Significance S=105 WH(τν)Di-jeteνW  eνjjWW  jjlνZZ  jjllothers no cut after cut

H +  WZ

Process Final states used is H  WZ  l The BF is about 6% Not major decay process but easy to extend from H   Z  qq (~70%) Z  ll (~10%) Z  (~20%) W  qq (~70%) 49%7%14% W  l (~30%) 21%3%6%

W mass and Recoil Mass 11 0 cut 70 < Mw < 90 (GeV) 110 < Mrec < 190 (GeV) 11 0

Other Selections for H  WZ Selections are same as H   analysis except Evis was loosened from 170 GeV to 200 GeV No BDT since we quickly tried it but sensitivity not improved. Need more study cut 15 < total Pt (GeV) cut Evis < 200 (GeV) 0.95 < | cosθ Wangle |

Cut-flow Table for H +  WZ WH(WZ)Di-jeteνW  eνjjWW  jjlνZZ  jjllothers no cut m w &m rec pt Evis Wangle

Recoil Mass Efficiency ε = 8.89% Significance S = (F HWZ =1, F HWγ =0, BR(H  WZ)=100 ％ ) WH(WZ)Di-jeteνW  eνjjWW  jjlνZZ  jjllothers no cut after cut

Upper Limits on  and F HWZ From the obtained efficiency and number of backgrounds, upper limits are calculated. H   H  WZ

Interpretation to 2HDM type-X with H   2HDM type-X Lepton specific H +   can be dominant Type-II is strongly constraint by LHC Shaded region (tan  < 1) is constraint from B-B-bar mixing We cannot set better limit on 2HDM type-X Since loop suppressed (figures by Kanemura)

Georgi-Machacek model GM Additional complex Y=1 and real Y=0 triplet fields H 1 0, (H 3 ±, H 3 0 ),(H 5 ±±, H 5 ±, H 5 0 )  =1 at tree level Due to custodial symmetry Large (a few 10GeV) triplet VEV, v , possible H 5 mainly decays to gauge bosons if triplet VEV is not small (v  >~ MeV) and H 5 lighter than H 3. H 3 mainly to fermion pairs. Tree level ZWH 5 ± coupling Current LHC result can make a constraint from  F and  V, and also from direct searches for H 5 0  WW,ZZ H 5 ±  WZ and H 5 ±±  WW (see Chiang’s talk slides at this workshop) Chiang, Yagyu, JHEP 01, 026 (2013)

Interpretation to GM model with H  WZ Kanemura, Yagyu, Yanase, PRD (2011)

Summary We studied charged Higgs production associated with W boson. Two charged Higgs decays are considered H   H  WZ  l Interpretations to 2HDM type-X and GM model. No constraint on 2HDM type-X with H   Give constraint on GM model with H  WZ Possible Improvements Exclusive analysis Inclusion of other decay processes H  WZ  l ll Ecm=500GeV with heavier H +

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Cross Section ProcessCross section (fb)Events (k) Sig ① WH (H  τν)21454 Sig ② WH (H  WZ)21454 SM BG Di-jet eνW  eνjj Zee  jjee30074 WW  jjlν WW  jjjj ZZ  jjll ZZ  jjjj ZZWWmix  jjjj Zh  ffh20551