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News from Louvain K. Piotrzkowski

News from Louvain K. Piotrzkowski. Fast proton tracking in the LHC beamline J. de Favereau & X. Rouby Luminosity with lepton pairs Y. Liu & O. Militaru. Roman Pots. Q. D2. ~75 m. IP. ~160 m. D1. Measuring (very) forward protons.

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News from Louvain K. Piotrzkowski

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  1. News from LouvainK. Piotrzkowski Fast proton tracking in the LHC beamline J. de Favereau & X. Rouby Luminosity with lepton pairs Y. Liu & O. Militaru

  2. Roman Pots Q D2 ~75 m IP ~160 m D1 Measuring (very) forward protons • To good approximation beam protons move independently in horizontal and vertical planes • Particle point-to-point transfer can be computed using transport matrices (X=MX0) or, equivalently optics functions b, F and D x = x*(b/b*)sinF + qx*(bb*)cosF + DDE/E = x Horizontal plane:

  3. Fast simulation Motivation: Provide a tool for fast event-by-event proton tracking through the LHC beam-line which could be directly implemented into Oscar/Orca (for the moment simplified model of the proton detection used); will allow for systematic studies as magnet displacement etc. Method: describe each LHC element between IP5 and 240 (420) m as a drift space/dipole/ quadrupole by a separate transport matrix + its aperture description (check if proton’s position at the end of an element is accepted)

  4. First run of fast MC • Run MC: • smear vertex • transport scattered p • gaussian detector • smearing (10 mm) • reconstruct variables = 10  from beam 100 mm 2 mm All in one step now, ie. only one matrix used Example: 200 GeV photons with Q2=2 GeV2

  5. Status/plans The software (with dummy modules ) is ready for detailed simulation – the newest settings are being implemented (v6.5) but we lack precise positions of the quadrupoles – expect to receive next week. First results expected then in a couple of weeks. As a cross-check reproduction of design orbit and comparisons with MAD-X simulation is foreseen

  6. Luminosity with lepton pairs • LPAIR ME MC generator by Vermaseren has been adopted for CMS (HEP event structure introduced and interface to CMKIN); first event samples are being processed by Oscar and Orca • Plans: • Study luminosity measurements in CMS: • Forward e+e- pairs in Castor: resolutions and calibration methods; • Central e+e- pairs in ECAL: resolutions and trigger strategies for low pT electrons; • Central ee and mm pairs using nominal triggers: check acceptances and resolutions. • Study possibility of calibrating Roman Pots using lepton pairs (global check, generator level encouraging)

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