Analyzing H2a4b updates for mass reconstruction
Analyzing the process of reconstructing the mass of a singlet scalar using final state 4b events. Details on b-jet reconstructions and performance evaluation are included. Insights into matching b-quarks and finding B-jets are discussed to enhance understanding. Combinations of fatjets and bjets are explored, along with recombination of 3 b-jets. Plans for accurately determining B-jets from truth b-quarks with some information loss are outlined.
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Presentation Transcript
H2a4b Updates --Zelin Yan 2025/4/21 1
Analysis overview Process:H 2a 4b Using the final state 4b to reconstruct the mass of singlet scalar a EventNumber = 10000 Mass point selection: ??= 60GeV 2025/4/21 2
Previous:bjets reconstruction(num = 3) Num of bjets = 3 AntiKt10 TruthTrimmedPtFrac5SmallR20 Jets Num of LargeR-jets(Nbjets=3) 3 2025/4/21
Previous: bjet reconstruction(num=3) Merged bjets(B-jets): B-jet can match 2 b-quarks But in some events,B-jets can match 3 b-quarks 2025/4/21 4
Find B-jets B-jet: 2 b quarks are merged From truth b quarks , if R < 0.4 between 2 b- quarks,there is one B-jet in this event
Find B-jets bjets num = (<1,1,2,3,>4) B-jets num = (0,1,2) There are 13 combinations of (fatjetsNum,bjetsNum) Distribution of all combinations
Case (0,4) and (1,3) (fatjetNum,bjetNum)=(0, 4): mass of scalar a is reconstructed well(previous) (fatjetNum,bjetNum)=(1,3): Exclusive events:Nbjet=3,Njets 4,and there are 4 jets that can match 4 different b-quarks total events num = 29 Find two of bjets that can only match 1 truth b-quark,and then using AntiKt10jets to match the remain 2 b-quarks , see this LargeRjet as B-jet 2 bjets that can match 1 bquark from one scalar a , and largeRjet as another scalar a
Performance Mass of a reconstructed badly Mass of higgs reconstructed better than a Some Information of a mass are lost
3 bjets recombination Leading b jet +any other jet: mass of are larger than truth a mass(60GeV) leading bjet has higher possibility to match 2 b-quarks(B-jet)
Summary & Plans Find the B-jets number from truth b-quarks For fatjetNum=1,bjetNum=3 , some information are lost when reconstructing mass of a , but mass of higgs are reconstructed well(relatively) In this case,leading b-jet tend to be the LargeRjet. Plans: Other cases like (2,3) and (2,2) 2 b-quark in one LargeRjet from different a?
