Higgs at LHeC

Monday 12 Oct 2015, 11:00 → 12:30 Europe/Zurich

CERN

CERN - Tokyo Tech - Liverpool - Johannesburg - NIKHEF

Minutes text provided by the presenters.

(Tanaka-san)

I just reported my plans for H->bb analysis in the meeting.
I'm running the Delphes using pythia samples of H->bb signal and background with new detector setups.
In the new setups, I just changed b-tag coverage to be |eta|<3.0 from 4.7, and other parameters are same with previous ones.
Then I will check the result, and optimize cut parameters or add new cut (no idea now) since the result should be worse with tighter b-tag coverage.

(Mukesh)

We discuss following:

1. Fate of one of our paper on di-Higgs which is in communication http://arxiv.org/pdf/1509.04016.pdf

2. Our work on single top in e-p collider (LHeC) http://arxiv.org/pdf/1307.1688.pdf (however recent draft modified, not updated in arXiv)

3. Related to 2nd point we discussed our progress to do detector level analysis where Xifeng showed some slides explaining the

• cut-flows and there effect on signal/backgrounds:
• hadronic and leptonic channels agrees well with parton/particle/jet level
• cut-flow is very efficient to reduce background
• leptonic decay mode is cleaner than hadronic but in hadronic mode we have discriminant observables
• Further we work for exclusion limits for NP couplings appearing in the Lag.(1307.1688)

(Xifeng) See uploaded slides.

“We studied the detector effect of single top analysis. The result is consistent with the previous particle level study. We found the costheta(Wb), J1Dot(J2 Cross b) as some sensitive variables to distinguish the difference of couplings. We also checked the signal cut flow of parton, particle, jets level. They are consistent.“

11:00 → 11:20 Status Report

Speaker: Masahiro Tanaka (Tokyo Institute of Technology (JP))

11:20 → 11:40 Status report 2

Speakers: Mukesh Kumar (KarMic), Mukesh Kumar (University of the Witwatersrand (ZA)), Xifeng Ruan (University of the Witwatersrand (ZA))

11:40 → 12:00 Hbb and Hcc using jet lifetime probabilities

Speaker: Uta Klein (University of Liverpool (GB))

12:00 → 12:20 Status of Wits Studies

Speakers: Bruce Mellado Garcia (University of the Witwatersrand), Bruce Mellado Garcia (University of Wisconsin), Mukesh Kumar (University of the Witwatersrand (ZA)), Xifeng Ruan (University of the Witwatersrand (ZA))

singletop.pdf