BSM Search using Higgs to Invisible Decay Yu Kato The University of Tokyo Asian Physics and Software Meeting 2016/9/16
Status l I try to study leptonic channel with the help of Junping san. l I adjusted all cut conditions except MVA cut. BSM Search using Higgs to 2 2016/9/16 @Regular meeting Invisible Decay
Cut List Number Contents 0 Pre Cut (by Lepton Selection Processor) 1 Lepton ID 2 Loose Cut by Pt_Z > 10GeV & M_Z ∈ [71,111]GeV & M_recoil ∈ [105,165]GeV 3 Pt_Z > 20GeV 4 M_Z ∈ [80,100]GeV 5 |ΔPt|≡|Pt_dl – Pt_γ_max| > 20GeV 6 |cosθmis|< 0.96 7 M_recoil ∈ [120,140]GeV 8 M_mis > 110GeV & Evis < 15GeV Red number is what I adjusted. ※ Junping’s original code contains MVA cut in No.9. BSM Search using Higgs to 3 2016/9/16 @Regular meeting Invisible Decay
Leptonic Channel Analysis [Ecm=250GeV,250fb -1 ] 𝜈𝜈H, H → inv(BR = 0.1) eeH, H → inv(BR = 0.1) Left Right BSM Search using Higgs to 4 2016/9/16 @Regular meeting Invisible Decay
Summary l Started leptonic channel analysis. Significance 𝜈𝜈 H eeH 250GeV,250fb -1 ,H→inv(BR=0.1) Left 3.71 2.90 Right 6.08 4.77 l I’m gradually catching on analysis code. BSM Search using Higgs to 5 2016/9/16 @Regular meeting Invisible Decay
Plans l Study analysis code [Continuously] ◦ I got the analysis code from Junping san. ◦ First, reproduce the leptonic channel, then study hadronic channel. l Understand analysis method [Continuously] Ø Jet clustering algorithm Ø MVA BDT ◦ Apply to the hadronic channel ○ MLP Ø Kinematic Fitting ○ Likelihood ○ ◦ For good resolution l Think of ways to improve measurement precision [Finally] BSM Search using Higgs to 6 2016/9/16 @Regular meeting Invisible Decay
Back Up BSM Search using Higgs to Invisible 7 2016/9/16 @Regular meeting Decay
BSM Search using Higgs to 8 2016/9/16 @Regular meeting Invisible Decay
Leptonic Channel Analysis [Ecm=500GeV,500fb -1 ] 𝜈𝜈H, H → inv(BR = 0.1) eeH, H → inv(BR = 0.1) Left Right BSM Search using Higgs to 9 2016/9/16 @Regular meeting Invisible Decay
ν q ν ν q q Z X X Z q ν Higgs to Invisible Decay l In the SM, Higgs decays invisibly through the process H → ZZ ∗ → 4𝜉 (BR~0.1%). Dark Matter… l If the BR is over the prediction of the SM, SUSY… It is reliable evidence for new physics beyond the SM. invisible BSM invisible 𝐶𝑆 H → ZZ ∗ → 4𝜉 ~0.1% 𝐶𝑆 H → XX ~???% < ∝ 𝜏 ?@ ・ 𝐶𝑆 H → 𝑗𝑜𝑤𝑗𝑡𝑗𝑐𝑚𝑓 𝑂 visible visible BSM Search using Higgs to 10 2016/9/16 @Regular meeting Invisible Decay
� Recoil Mass Method l For my study, I reproduced the study of Higgs Recoil Mass method. l It is important for Higgs invisible decay study. l Model independence ◦ We can measure Higgs without the direct measurement of it. ◦ Measure Higgs cross section and Higgs mass precisely. 𝑂 < 𝜏 ?@ = 𝐶𝑆 Z → 𝑚 H 𝑚 I ε < 𝑀 − 𝐹 T U T V P − 𝑞 P ⃗ T U T V P 𝑁 MNO = 𝑡 l For this study, I used leptonic channel 𝑎 → 𝑚 H 𝑚 I . l For the search of BSM, I will also use hadronic channel 𝑎 → 𝑟𝑟 . BSM Search using Higgs to 11 2016/9/16 @Regular meeting Invisible Decay
Reproduce Recoil Mass Result Ref. ： J.Y. et al, arXiv:1604.07524 𝑓 I + 𝑓 H → 𝜈 I + 𝜈 H + 𝑌 @250GeV “Right”: 𝑄 𝑓 I ,𝑓 H = (+0.8,−0.3) “Left”: 𝑄 𝑓 I ,𝑓 H = (−0.8,+0.3) Isolated lepton selection 2�� �� M�EI�G �D�G (D�G (D�MG ����G�15 ��EI�D�A�IAC �((� ���,-)� ����,� ���(� �-(���� ��(� ��9LC�2�� ��7C���I�63����I �(�- ����)� ��(�( �(��� ���,-� ��,� ��8�GG�S�������>5C< ��,� (��)-� (���� ����) (-�-�- ���- ������S������>5C< ���) ,���� ����� �)��� ��,��( ��(� (��A�MT��M�.��-, ���) (�,�, �--)) �)��( ,,((� ���( Best lepton pair )�13������)�8<0 ���� ��,�� �--�� -�), (��,) ���� ��4P�M���5C< ���� ��(�� )(�� -�), ��-)� ���� ����IB�� ���( ���� ��,, ���� ��-)- ���� BSM Search using Higgs to 12 2016/9/16 @Regular meeting Invisible Decay
X X Signal feature [leptonic channel] invisible l Two-leptons l Invisible particles without neutrino l 𝑁 TT ≈ 𝑁 a ( 𝐶𝑆 Z → 𝑚𝑚 ~3.4% ) 𝐶𝑆 H → XX ~???% 𝑚 I l 𝑁 MNObcT ≈ 𝑁 dceef 𝑚 H Major Backgrounds [leptonic channel] The major backgrounds have the final states with di-lepton & missing energy . 1. ZZ leptonic 5. ννH , H → ZZ, Z → 𝑚𝑚 2. WW leptonic 6. 𝑚𝑚H, H → SM decay 3. single Z & 𝜉 N 𝜉 N , Z → 𝑚𝑚 4. single W & e 𝜉 N , W → e ν k BSM Search using Higgs to 13 2016/9/16 @Regular meeting Invisible Decay
X q X q Signal feature [hadronic channel] invisible l Two-Jet l Invisible particle exist l 𝑁 tt ≈ 𝑁 a ( 𝐶𝑆 Z → 𝑟𝑟 ~70% ) 𝐶𝑆 H → XX ~???% l 𝑁 MNObcT ≈ 𝑁 dceef Major Backgrounds [hadronic channel] The major backgrounds have the final states qqll,qqlν,qqνν. 1. ZZ semileptonic 5. ννH , H → ZZ, Z → 𝑟𝑟 2. WW semileptonic 6. qqH, H → SM decay 3. Z𝜉 N 𝜉 N , Z → qq 4. W𝜉 N 𝜉 N , W → qq BSM Search using Higgs to 14 2016/9/16 @Regular meeting Invisible Decay
W ν γ e + Z q q q q ν Z q q ν l q q Background BSM Search using Higgs to 15 2016/9/16 @Regular meeting Invisible Decay
Cut Table [Ecm=250GeV,250fb -1 , 𝜈𝜈H ,Left] BSM Search using Higgs to 16 2016/9/16 @Regular meeting Invisible Decay
Cut Table [Ecm=250GeV,250fb -1 , 𝜈𝜈H ,Right] BSM Search using Higgs to 17 2016/9/16 @Regular meeting Invisible Decay
Cut Table [Ecm=250GeV , 𝑓𝑓H ] BSM Search using Higgs to 18 2016/9/16 @Regular meeting Invisible Decay
Cut Table [Ecm=250GeV, eeH ,Left] BSM Search using Higgs to 19 2016/9/16 @Regular meeting Invisible Decay
Cut Table [Ecm=250GeV, eeH ,Right] BSM Search using Higgs to 20 2016/9/16 @Regular meeting Invisible Decay
Mz Mrecoil Ptz [Ecm=500GeV] BSM Search using Higgs to 21 2016/9/16 @Regular meeting Invisible Decay
[ 先⾏研究 ] 引⽤ :LCWS14 ⽯川さんのスライドより Signal l Z 由来のジェット対 l エネルギー損失が ヒッグス質量に相 当 by Toy MC BSM Search using Higgs to 22 2016/9/16 @Regular meeting Invisible Decay
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