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Signal extraction of $\psi$(2S)

Figure Information
Scope: PWG
PWG-DQ (Dileptons and Quarkonia)
Energy
13.6 TeV
System
p-p
Figure Group
Non-prompt $\psi$(2S) fraction in pp collisions at 13.6 TeV [SQM2026]
Figure Image
Figure image (.eps)
signalext_pt5.0_7.0.eps
Figure image (.pdf)
signalext_pt5.0_7.0.pdf
Figure Caption

Signal extraction of $\psi$(2S) in 5 < $p_{T}$ < 7 GeV/c, with cut on BDT background score < 0.6. Track rotation is used to estimate combinatorial background. The data points are fitted with gaus + poly2. 

Detail description

Data sample: LHC24 apass1 skimmed, dielectron trigger

Cut:

  • electron: 
    • $p_{T}$ > 1 GeV/c; |$\eta$| < 0.8
    • SPD any; TPC chi2 < 4; TPC ncls > 100
    • |DCAxy| < 0.5 cm; |DCAz| < 0.5 cm
    • |TPC nsigma e| < 3; TPC nsigma pi, pr > 2.7
  • pion:
    • $p_{T}$ > 0.1 GeV/c; |$\eta$| < 0.8
    • SPD first; TPC ncls > 100 when pT > 0.3
    • |DCAxy| < 0.5 cm; |DCAz| < 0.5 cm
    • |TPC nsigma pi| < 3 when pT > 0.3
  • pair: 
    • 2.8 < Mee < 3.2
    • has dilepton and dilepton-track-track secondary vertex
    • DeltaR2 < 1, pT >5
    • DeltaR2 < -0.4pT + 3, pT < 5
    • bkg output < 0.6