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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

News from LouvainK. Piotrzkowski

Fast proton tracking in the LHC beamline

J. de Favereau & X. Rouby

Luminosity with lepton pairs

Y. Liu & O. Militaru

Roman Pots



~75 m


~160 m


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:

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)

First run of fast mc
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


200 GeV photons

with Q2=2 GeV2


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

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)