Contact
Name
Gustavo Gil Da Silveira
Position
Former member
Postdoc in CP3 from February 2012 to March 2014
Current position: Professor.
Research statement
Working on high-energy photon interactions, particularly studying the electroweak boson photoproduction in exclusive events at the LHC. This approach allows one to employ the calculation with no need of a parametrization for the elastic interaction.

Working on exclusive production at the LHC, especially in the analysis of the data from the CMS detector.
Projects
I am involved in the following research directions:

#### Fast Simulation of the CMS experiment

A framework for Fast Simulation of particle interactions in the CMS detector (FastSim) has been developed and implemented in the overall simulation, reconstruction and analysis framework of CMS. It produces data samples in the same format as the one used by the Geant4-based (henceforth Full) Simulation and Reconstruction chain; the output of the Fast Simulation of CMS can therefore be used in the analysis in the same way as data and Full Simulation samples. FastSim is used in several physics analyses in CMS, in particular those requiring a generation of many samples to scan an extended parameter space of the physics model (e.g. SUSY) or for the purpose of estimating systematic uncertainties. It is also used by several groups to design future sub-detectors for the Phase-II CMS upgrades.
Related activities at UCL include the integration with the Full Simulation in the simulation of the electronic read-out ("digitization") and of the pileup of events from other proton-proton collisions, both in-time and out-of-time; the performance monitoring; and the overall maintenance and upgrade of the tracking-related code. Matthias Komm is current L3 convener of Tracking in FastSim, and Andrea Giammanco has been main responsible of the FastSim project from 2011 to 2013.

#### 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).

Publications in CP3
All my publications on Inspire

#### 2016

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] [Journal] Submitted to JHEP
Refereed paper. 19th April.

#### 2015

Evidence for exclusive gamma-gamma to W+ W- production and constraints on Anomalous Quartic Gauge Couplings at sqrt-s = 8 TeV
CMS collaboration

Public experimental note. 3rd October.

#### 2014

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] [Journal] 26 pages, 40 figures, 2 tables, submitted to JHEP
Refereed paper. 4th September.
Exclusive processes in pp collisions in CMS
da Silveira, Gustavo G.
[Abstract] [PDF] 7 pages, 6 figures, presented at the XXI International Workshop on Deep-Inelastic Scattering and Related Subjects, April 2013, Marseille, France
Contribution to proceedings. 11th June.
Exclusive production of $W$ pairs in CMS
da Silveira, Gustavo G.
[Abstract] [PDF] 8 pages, 10 figures, 1 table, Proceedings of the 2nd International Conference on New Frontiers in Physics, Kolymbari, Crete, Greece, Aug. 28th -- Sept. 5th, 2013
Contribution to proceedings. 11th June.

#### 2013

Observing light-by-light scattering at the Large Hadron Collider
David d'Enterria, Gustavo G. Da Silveira
[Abstract] [PDF] [Journal] [Full text] Phys. Rev. Lett. 111, 080405 (2013)
Refereed paper. 31st May.
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] [Journal] [Full text 1] [Full text 2] Published in JHEP 07 (2013) 116 [FSQ-12-010]
Refereed paper. 31st May.

Contact : Jérôme de Favereau
Research
Job opportunities Postodoctoral position in SoLid
EOS be.h : 10 PhD positions