Background studies for the ILD vertex detector Rita De Masi IPHC-Strasbourg.

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Presentation transcript:

Background studies for the ILD vertex detector Rita De Masi IPHC-Strasbourg

Characteristics of the study GuineaPig b e + e - pairs bremsstrahlung photons spent beam Mokka detector model LDCPrime_02Sc_p01 VXD_side_band_electronic option 0 rangeCut 1mm LorentzTransformationAngle 7 mrad

e + e - pairs background in z … z (mm) hits/mm 2 /BX layer1 layer2 layer3 layer4 layer5 ~ 0.07

…and   (  ) hits/mm 2 /BX layer1 layer2 layer3 layer4 layer5 ~ 0.1 ~ 0.05

vtx-z of particles hitting the VTX

Cut on |vtx z| distribution in z… |vtxz|<3000 mm z (mm) hits/mm 2 /BX |vtxz|>3000 mm layer1 layer2 layer3 layer4 layer5

…and   (  ) hits/mm 2 /BX |vtxz|<3000 mm |vtxz|>3000 mm layer1 layer2 layer3 layer4 layer5

beamstrahlung photons (preliminary) out of 50 BX (~2x10 7 generated particles) no hits in the VTX neither direct nor indirect

spent beam (very very preliminary) ~ 0.04 hits/mm 2 /BX on layer1 (~50% of pairs contribution) BUT study out of only 1/20th of BX (due to extremely long simulation time)

Conclusion Pairs: - all elements along the beam line Beamstrahlung  further study  Spent beam: “ Bhabbha, …