bwd EMC and fwd PID material

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Presentation transcript:

bwd EMC and fwd PID material BK*nn vs HAD tag: impact of bwd EMC and fwd PID material Elisa Manoni INFN Sez. Perugia EMC session, Caltech general Meeting, December 15, 2010

Outline DG configurations and samples from September production impact of bwd EMC used as a veto impact of material in front of Fwd EMC

Detector geometries DG_4 : SVT_L0 + fwd TOF+ bwd EMC  impact of bwd EMC DG_4a : as DG_4 but TOF made if Air (0-thickness TOF)  impact of TOF material in front of the EMC 3 3

Analysis strategy Baseline analysis impact of Bwd EMC: DG_4_allbkgs with Fwd TOF on and Bwd EMC off impact of Bwd EMC: DG_4_nopairs with Fwd TOF switched on and Bwd EMC switched on cut on Eextra deposited in bwd EMC (+ usual cut on Eextra from Barrel+Fwd) impact of material in front of Fwd EMC DG_4a_nopairs with Fwd TOF switched on and Bwd EMC switched off first look to evaluate impact on, comparing with DG_4 results

Eextra distributions : barrel + forward minimum gamma energy = 30 MeV signal MC BB cocktail Kp Kp0 Ksp

Eextra distributions : backward minimum gamma energy = 30 MeV signal MC BB cocktail Kp Kp0 Ksp

Eextra_bwd cut: optimization Strategy: scan the region Eextra_Bwd ∈ [0.05,0.5] GeV and compute FOM = S/sqrt(B) optimal cut ↔ maximum FOM Ksp B0K*0nn Kp B+K*+(K+p0)nn

Eextra_bwd cut: results EextraBwd < 0.05 GeV:

Impact of material in front of fwd EMC DG_4a cocktail + signal

p0 and g reconstruction efficiency reconstruction normalized to number of generated g/p0 some cuts applied at reconstruction level cannot be reproduce in the mc truth; cutting on Eg>50 MeV , g reconstruction efficiency in the fwd goes to 40%

Impact on physics results (I) Eextra barrel + forward distributions, before Eextra cut Kp minimum gamma energy = 30 MeV DG_4 signal MC DG_4a signal MC Kp0 Ksp

Impact on physics results (II) DG_4 signal MC DG_4a signal MC Kp cut flow efficiency: DG_4 and DG_4a consistent within statistical error Kp0 Ksp

Conclusion DG studies performed using September_2010 Production BWD EMC preliminary studies indicates a 10% enhancement in the FOM when applying the Eextra_bwd cut EFFECT OF MATERIAL IN FRONT OF FWD EMC more studies needed to evaluate effect on gamma and p0 reconstruction physics performances doesn’t seem to change on signal MC, cocktail MC needs to be studied

Back-up slides

PacHadRecoilUser code SemiExclusive reconstruction of Hadronic B modes limit the number of reconstructed Breco channels reconstruct only modes with purity >50% generate ad-hoc BB cocktail sample instead of generic Available Bsig modes K* K , Ks()  , with e, , , (0), a1()

Sample used 2010_September production, FastSim release V0.2.5, revs 307 and 311

p0 Lists p0 from D : “pi0AllDefault” CalorNeutral preFitSelectors: "Mass 0.115:0.150" fittingAlgorithm: "Add4”, fitConstraints: "Mass”, "Momentum”, "PrimaryVertex” p0 from D*0 : “pi0SoftDefaultMass” preFitSelectors: "Mass 0.115:0.15”, "CmsP :0.45” p0 from Breco : “pi0DefaultMass” fittingAlgorithm : “Add4”, fitConstraints: "Mass”, "Momentum”, "PrimaryVertex”

Photon list CalorNeutral for p0 reconstruction GoodPhotonsVisibleE selection: eRawCut set 0.050, nCrys set 3, latShapeCut set 0.6 thetaMin set 0.32 thetaMax set 2.44 TrkListForDeltaAlpha set ChargedTracks electronSelector set PidLHElectrons deltaAlphaMin set 0.08