Analyzing H2a4b Updates and Signal Kinematics in Particle Physics
Delve into the process of H2a4b analysis, exploring signal kinematics and particle interactions to understand scalar events, mass points, and particle merging. Discuss the challenges of dealing with Njets and efficiency optimizations in the final analysis.
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Presentation Transcript
H2a4b Updates --Zelin Yan 2025/3/20 1
Analysis overview Process:H 2a 4b Using the final state 4b to reconstruct singlet scalar a EventNumber = 10,000 Mass point selection: ??= 12 30 60GeV 2025/3/20 2
H2a4b analysis Complement the kinematics of parton level Try to deal with Njets = 3 , but there are some problems to solve Get the efficiency of last analysis
Signal kinematics H pt corresponds to Z boson pt because they are recoiling off each other. H pt and Z pt are irrelevant to a mass.
Signal kinematics When a has large mass , the distance between 2a is small.Because its pt over mass ratio is small.
Signal kinematics When a has low mass, 2 b from same a cannot be separated.So in the final state,they are more possible to merge into one largeRjet.
Signal kinematics In many cases , b- quarks has low pt(less than 20GeV),especially the subleading b quark
Cases Njets=3 If one largeRjet can match only one jet,use this largeRjet to substitude this jet. 3 jets four-momentum added together and calculate invariant mass m_jjj Set higgs mass window |m_jjj-125GeV| < 10 GeV Use 3 jets to match 4 bquarks. Problem(solve after undergraduate thesis finished) In most cases, 2 jets match 4 bquarks and 1 jet is left.
Get the efficiency of last analysis In the Appendices G:Hypothesis testing neural network Their efficiency = 4jets match 4b number/total selected number Our efficiency = 4jets match 4b number/total n=4 number
Summary & Plans DDL of thesis plagiarism check adjusted to 4/24. Complement the kinematics of parton level Get the efficiency of last analysis Plans Keep on finishing undergraduate thesis Compare the efficiency of last analysis with our efficiency
