BSM Search using Higgs to Invisible Decay Yu Kato The University of - - PowerPoint PPT Presentation

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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.

SLIDE 1

BSM Search using Higgs to Invisible Decay

Yu Kato The University of Tokyo

Asian Physics and Software Meeting 2016/9/16

SLIDE 2

Status

lI try to study leptonic channel with the help of Junping san. lI adjusted all cut conditions except MVA cut.

2016/9/16 @Regular meeting

BSM Search using Higgs to Invisible Decay 2

SLIDE 3

Cut List

Number Contents 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

2016/9/16 @Regular meeting

BSM Search using Higgs to Invisible Decay 3

※Junping’s original code contains MVA cut in No.9. Red number is what I adjusted.

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Leptonic Channel Analysis [Ecm=250GeV,250fb-1]

2016/9/16 @Regular meeting

BSM Search using Higgs to Invisible Decay 4

𝜈𝜈H, H → inv(BR = 0.1) eeH, H → inv(BR = 0.1)

Left Right

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Summary

lStarted leptonic channel analysis. lI’m gradually catching on analysis code.

2016/9/16 @Regular meeting

BSM Search using Higgs to Invisible Decay 5 Significance 250GeV,250fb-1,H→inv(BR=0.1) 𝜈𝜈H eeH Left 3.71 2.90 Right 6.08 4.77

SLIDE 6

Plans

lStudy analysis code [Continuously]

I got the analysis code from Junping san.
First, reproduce the leptonic channel, then study hadronic channel.

lUnderstand analysis method [Continuously]

ØJet clustering algorithm

Apply to the hadronic channel

ØKinematic Fitting

For good resolution

lThink of ways to improve measurement precision [Finally]

2016/9/16 @Regular meeting

BSM Search using Higgs to Invisible Decay 6

Ø MVA

○

BDT

○

MLP

○

Likelihood

SLIDE 7

Back Up

2016/9/16 @Regular meeting

BSM Search using Higgs to Invisible Decay 7

SLIDE 8

2016/9/16 @Regular meeting

BSM Search using Higgs to Invisible Decay 8

SLIDE 9

Leptonic Channel Analysis [Ecm=500GeV,500fb-1]

2016/9/16 @Regular meeting

BSM Search using Higgs to Invisible Decay 9

𝜈𝜈H, H → inv(BR = 0.1) eeH, H → inv(BR = 0.1)

Left Right

SLIDE 10

lIn the SM, Higgs decays invisibly through the process H → ZZ∗ → 4𝜉 (BR~0.1%). lIf the BR is over the prediction of the SM, It is reliable evidence for new physics beyond the SM.

Higgs to Invisible Decay

q q

BSM

X X

invisible

Dark Matter… SUSY…

visible 𝐶𝑆 H → XX ~???% 𝑂

< ∝ 𝜏?@・𝐶𝑆 H → 𝑗𝑜𝑤𝑗𝑡𝑗𝑐𝑚𝑓

q q Z Z ν ν ν ν

𝐶𝑆 H → ZZ∗ → 4𝜉 ~0.1% invisible visible

2016/9/16 @Regular meeting

BSM Search using Higgs to Invisible Decay 10

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Recoil Mass Method

2016/9/16 @Regular meeting

BSM Search using Higgs to Invisible Decay 11

lFor my study, I reproduced the study of Higgs Recoil Mass method. lIt 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.

𝜏?@ = 𝑂< 𝐶𝑆 Z → 𝑚H𝑚I ε<𝑀 𝑁MNO

= 𝑡

− 𝐹TUTV P − 𝑞

⃗TUTV P

l For this study, I used leptonic channel 𝑎 → 𝑚H𝑚I. l For the search of BSM, I will also use hadronic channel 𝑎 → 𝑟𝑟.

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Reproduce Recoil Mass Result

2016/9/16 @Regular meeting

BSM Search using Higgs to Invisible Decay 12

“Left”:𝑄 𝑓I,𝑓H = (−0.8,+0.3) “Right”:𝑄 𝑓I,𝑓H = (+0.8,−0.3)

Ref.： J.Y. et al, arXiv:1604.07524 𝑓I + 𝑓H → 𝜈I + 𝜈H + 𝑌@250GeV

Best lepton pair Isolated lepton selection

2 MEIG DG (DG (DMG G15

EIDAIAC

9LC2 7CI63I (( ,-) , ( -( ( (- ) (( ( ,- , 8GGS>5C< , ()- ( ) (---

S>5C<

) ,

)

,( ( (AMTM.-, ) (,,

)( ,,(( ( )13)8<0

(,)

4PM5C<
(

)(

),
)
IB

(

SLIDE 13

Signal feature [leptonic channel]

lTwo-leptons lInvisible particles without neutrino l𝑁TT ≈ 𝑁a (𝐶𝑆 Z → 𝑚𝑚 ~3.4%) l𝑁MNObcT ≈ 𝑁dceef

2016/9/16 @Regular meeting

BSM Search using Higgs to Invisible Decay 13

𝑚H X X

invisible 𝐶𝑆 H → XX ~???%

Major Backgrounds [leptonic channel]

The major backgrounds have the final states with di-lepton & missing energy .

1. ZZ leptonic
2. WW leptonic
3. single Z & 𝜉N𝜉N, Z → 𝑚𝑚
4. single W & e 𝜉N, W → e νk
5. ννH,H → ZZ, Z → 𝑚𝑚
6. 𝑚𝑚H, H → SM decay

𝑚I

SLIDE 14

Signal feature [hadronic channel]

lTwo-Jet lInvisible particle exist l𝑁tt ≈ 𝑁a (𝐶𝑆 Z → 𝑟𝑟 ~70%) l𝑁MNObcT ≈ 𝑁dceef

2016/9/16 @Regular meeting

BSM Search using Higgs to Invisible Decay 14

q q X X

invisible 𝐶𝑆 H → XX ~???%

Major Backgrounds [hadronic channel]

The major backgrounds have the final states qqll,qqlν,qqνν.

1. ZZ semileptonic
2. WW semileptonic
3. Z𝜉N𝜉N, Z → qq
4. W𝜉N𝜉N, W → qq
5. ννH,H → ZZ, Z → 𝑟𝑟
6. qqH, H → SM decay

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Background

2016/9/16 @Regular meeting

BSM Search using Higgs to Invisible Decay 15

q q l ν q q

ν ν q q q q Z e+

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Cut Table [Ecm=250GeV,250fb-1,𝜈𝜈H,Left]

2016/9/16 @Regular meeting

BSM Search using Higgs to Invisible Decay 16

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Cut Table [Ecm=250GeV,250fb-1,𝜈𝜈H,Right]

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BSM Search using Higgs to Invisible Decay 17

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Cut Table [Ecm=250GeV,𝑓𝑓H]

2016/9/16 @Regular meeting

BSM Search using Higgs to Invisible Decay 18

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Cut Table [Ecm=250GeV,eeH,Left]

2016/9/16 @Regular meeting

BSM Search using Higgs to Invisible Decay 19

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Cut Table [Ecm=250GeV,eeH,Right]

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BSM Search using Higgs to Invisible Decay 20

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Mz Mrecoil Ptz [Ecm=500GeV]

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BSM Search using Higgs to Invisible Decay 21

SLIDE 22

[先⾏研究]

2016/9/16 @Regular meeting

BSM Search using Higgs to Invisible Decay 22 引⽤:LCWS14 ⽯川さんのスライドより 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

Signal by Toy MC