Krzysztof Piotrzkowski
Centre for Cosmology, Particle Physics and Phenomenology - CP3
Université catholique de Louvain
2, Chemin du Cyclotron - Box L7.01.05
B-1348 Louvain-la-Neuve
+32 10 47 3244
UCL member card
PHY1311 Classical Electrodynamics (37.5 + 15 h)

PHY2372 Experimental Methods (35 + 12.5 h)

PHY2133 Physics of Elementary Particles II (30h)

PHY2360 Introduction to Radiation and Atomic and Nuclear Physics (22.5h)
People responsibilities
Research statement
Studying high-energy photon interactions at hadron colliders. In particular, interested by exclusive two-photon production of pairs of heavy charged particles at the LHC.

Working on novel tests of the gauge boson sector of the Standard Model and searches of physics beyond the SM as supersymmetry, for example. Involved also in studies of photoproduction of top quarks at the LHC.

Working on photo-production tagging techniques, using very forward, near beam detectors within the CMS High Precision Spectrometer project. In particular, developing novel, ultra-fast Cerenkov timing detectors with picosecond resolution.

Has expertise in precise luminosity measurements at colliders using QED processes, as the exclusive lepton pair production at the LHC.

Member of CMS and ZEUS collaborations.
I am involved in the following research directions:

GasToF: ultra fast timing detector

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 induced interactions at the LHC

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).

Show past projects.
Publications in CP3
Showing 5 publications over 38. Show all publications.
All my publications on Inspire


Evidence for exclusive gamma-gamma to W+ W- production and constraints on anomalous quartic gauge couplings at sqrt(s) = 7 and 8 TeV
Khachatryan, Vardan and others
[Abstract] [PDF] Submitted to JHEP
Refereed paper. 19th April.


Evidence for exclusive gamma-gamma to W+ W- production and constraints on Anomalous Quartic Gauge Couplings at sqrt-s = 8 TeV
CMS collaboration
[Full text]
Public experimental note. 3rd October.


Central $\mu^{+}\mu^{-}$ production via photon-photon fusion in proton-proton collisions with proton dissociation
Gustavo Gil da Silveira, Laurent Forthomme, Krzysztof Piotrzkowski, Wolfgang Sch\"afer, and Antoni Szczurek
[Abstract] [PDF] 26 pages, 40 figures, 2 tables, submitted to JHEP
Refereed paper. 4th September.


Study of exclusive two-photon production of $W^+W^-$ in pp collisions at $sqrt{s}$ = 7 TeV and constraints on anomalous quartic gauge couplings
CMS Collaboration
[Abstract] [PDF] [Full text 1] [Full text 2] Published in JHEP 07 (2013) 116 [FSQ-12-010]
Refereed paper. 31st May.


Measurement of the Z/gamma*+b-jet cross section in pp collisions at 7 TeV
Chatrchyan, SergueiProg. Part. Nucl. Phys. and others
[Abstract] [PDF] [Journal] [Full text] Published in the Journal of High Energy Physics
Refereed paper. 10th April.

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