GasToF (Gas Time-of-Flight) detector is a Cherenkov detector developed for very precise (with ~10 ps resolution) flight time measurements of very forward protons at the LHC. Such an excellent time resolution allows, using z-by-timing technique, for precise measurements of the event vertex z-coordinate and the background reduction. This detector is essential for selecting exclusive and semi-exclusive processes at the LHC, and can also be applied for the particle ID at future experiments.
External collaborators: CMS PPS project, M. Albrow (Fermilab), M. Khakzad (Tehran), J. Varela (Lisbon), and E. Schnys (Photonis) and J. Howorth (Photek Ltd).
High-energy photon-photon and photon-proton interactions at the LHC offer interesting possibilities for the study of the electroweak sector up to TeV scale and the search for processes beyond the Standard Model. After in-depth exploratory studies, we performed using the CMS data first measurement of two-photon muon pair production as well as first ever observation of W boson pairs produced by photon fusion. Now our group is leading unique investigations of quartic couplings between photons and W and Z bosons.
External collaborators: CMS FSQ analysis group and the group of A. Szczurek (Krakow).
We study the observation of single top quarks in photoproduction at the LHC as a way of detecting the presence of flavour changing neutral currents, predicted by some theories beyond the standard model.
Hector is a fast, multi-purpose simulator for the path of particles into beamlines.
It is build to be adaptative to any beamline and is already used by people from CMS (as a part of the official software) and ATLAS at the LHC and STAR at RHIC.
It is written in C++ and uses the ROOT framework to provide nice tools for analysis.
Results were cross-checked versus MAD-X, the official software used by the LHC machine group. It already allowed to obtain many estimations in terms of acceptance and resolutions of very forward detectors, as well as the effect of beamline misalignements and other related important topics related to forward detectors.
In collaboration with Xavier Rouby (Freiburg, D).
Precise determination of the absolute luminosity is crucial for many measurements in CMS. The measurement of the exclusive two-photon production of muons pairs by CMS provides a powerful method to calibrate the integrated luminosity.
External collaborators: CMS forward physics analysis group, CMS luminosity group.
Cryogenic detectors development for very high radiation environment.
External collaborators: RD39 collaboration.