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Update Photon selection for UPC Photon lines

Murilo Santana Rangel requested to merge msr_update_UPCPhoton into baudurie_ion_2024
  • test lines
  • include selection using Y position of the cluster to veto on very forward low pT electrons
  • reduce Et cut for photons used in UPC

Running over data (/lhcb/LHCb/Lead23/IFT.DST/00208341/0000/00208341_00001581_1.ift.dst)

We selected events that passed Hlt1HeavyIonPbPbUPCPhoton: two reconstructed photons with p_T(\gamma)>200 MeV, 2<\eta(\gamma)<4 and \Delta\varphi/\pi>0.1.

  • No Y Cut: 5085
  • With Y cut: 248
  • No Y Cut and p_T(\gamma\gamma)<500 MeV: 4830
  • With Y Cut and p_T(\gamma\gamma)<1000 MeV: 242

Extrapolation for 2024 data Expected reduction of 95% for Hlt1HeavyIonPbPbUPCDiPhoton_LowPt_Ycut and Hlt1HeavyIonPbPbUPCPhoton_Ycut.

Running over simulation (/scratch/allen_data/mdf_input/official-expected-2024-PbPb-minbias-mdf.mdf), the old lines are:

Hlt1HeavyIonPbPbUPCDiPhoton_LowPt:         2/   500, (  120.00 +/-    84.68) kHz
Hlt1HeavyIonPbPbUPCPhoton:                 1/   500, (   60.00 +/-    59.94) kHz
Hlt1HeavyIonPbPbUPCDiPhoton_HighMass:      1/   500, (   60.00 +/-    59.94) kHz
Hlt1HeavyIonPbPbUPCPhoton_HighEt:          1/   500, (   60.00 +/-    59.94) kHz

the new lines are:

Hlt1HeavyIonPbPbUPCDiPhoton_LowPt_Ycut:      4/   500, (  240.00 +/-   119.52) kHz
Hlt1HeavyIonPbPbUPCPhoton_Ycut:              0/   500, (    0.00 +/-     0.00) kHz
Hlt1HeavyIonPbPbUPCPhoton:                   0/   500, (    0.00 +/-     0.00) kHz
Hlt1HeavyIonPbPbUPCDiPhoton_HighMass:        1/   500, (   60.00 +/-    59.94) kHz
Hlt1HeavyIonPbPbUPCPhoton_HighEt:            1/   500, (   60.00 +/-    59.94) kHz

Running over simulation (/scratch/allen_data/mdf_input/official-expected-2024-PbAr-minbias-mdf.mdf), the old lines are:

Hlt1HeavyIonPbPbUPCDiPhoton_LowPt:         7/   500, (  420.00 +/-   157.63) kHz
Hlt1HeavyIonPbPbUPCPhoton:                 0/   500, (    0.00 +/-     0.00) kHz
Hlt1HeavyIonPbPbUPCDiPhoton_HighMass:      4/   500, (  240.00 +/-   119.52) kHz
Hlt1HeavyIonPbPbUPCPhoton_HighEt:          5/   500, (  300.00 +/-   133.49) kHz

the new lines are:

Hlt1HeavyIonPbPbUPCDiPhoton_LowPt_Ycut:      7/   500, (  420.00 +/-   157.63) kHz
Hlt1HeavyIonPbPbUPCPhoton_Ycut:              0/   500, (    0.00 +/-     0.00) kHz
Hlt1HeavyIonPbPbUPCPhoton:                   0/   500, (    0.00 +/-     0.00) kHz
Hlt1HeavyIonPbPbUPCDiPhoton_HighMass:        4/   500, (  240.00 +/-   119.52) kHz
Hlt1HeavyIonPbPbUPCPhoton_HighEt:            5/   500, (  300.00 +/-   133.49) kHz
Edited by Murilo Santana Rangel

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