Contact
Name
Georgios Konstantinos Krintiras

Position
Former member
PhD student in CP3 from February 2015 to January 2019

Personal homepage
https://gkrintir.web.cern.ch (under construction)
Oral Presentations
First measurement of the t-channel single top-quark cross section with CMS at √s = 13 TeV
École doctorale PHYSIQUE ET ASTROPHYSIQUE Journée des Doctorants, Mons, 10/2015

Measurement of the associated Higgs production with single top-quarks in the t-channel with CMS at √s = 13 TeV
3rd CMS Single-Top Workshop, Strasbourg, 06/2016
3rd CMS Single-Top Workshop, Strasbourg, 06/2016 (Workshop Photos)

Top quark pair production cross section measurements with CMS
QCD@LHC 2016 (7th edition), Zurich, 08/2016
QCD@LHC 2016 (7th edition), Zurich, 08/2016 (Conference Photo)

Measurement of the associated Higgs production with top quarks in CMS at √s = 13 TeV
25th DIS International workshop, Birmingham, 04/2017
PoS(DIS2017)290, Proceedings of the 25th DIS International workshop, Birmingham, 04/2017
25th DIS International workshop, Birmingham, 04/2017 (Workshop Photos)

Study of top production in complementary phase space regions and impact on PDFs in CMS
29th Rencontres de Blois on "Particle Physics and Cosmology", Blois, 05/2017
Proceedings of the 29th Rencontres de Blois on "Particle Physics and Cosmology", Blois, 05/2017
29th Rencontres de Blois on "Particle Physics and Cosmology", Blois, 05/2017 (Conference Photo)

Observation of top quark production in proton-nucleus collisions
10th International Workshop on Top Quark Physics (TOP 2017), Braga, 09/2017
Proceedings of the 10th International Workshop on Top Quark Physics (TOP 2017), Braga, 09/2017
10th International Workshop on Top Quark Physics (TOP 2017), Braga, 09/2017 (Workshop Photos)

Results on Top physics from CMS
International Workshop on Future Linear Colliders (LCWS 2017), Strasbourg, 10/2017
Proceedings of the International Workshop on Future Linear Colliders (LCWS 2017), Strasbourg, 10/2017
International Workshop on Future Linear Colliders (LCWS 2017), Strasbourg, 10/2017 (Workshop Photo)

Observation of top quark production in proton-nucleus collisions
Biannual LHC TOP WG meeting (2017), Geneva, 11/2017

Measurements of top properties and couplings at the LHC
SM@LHC 2018 conference, Berlin, 04/2018

Observation of top quark production in proton-nucleus collisions
SM@LHC 2018 conference, Berlin, 04/2018 (YSF talk)

Heavy ions at the LHC - overview
Heavy Ions and Hidden Sectors workshop, LLN, 12/2018

Heavy ions at the LHC - overview
When the M meets the P at IRMP, LLN, 12/2018

Public thesis defence/défense publique de thèse
Secteur des Sciences et Technologies/IRMP, LLN, 01/2019
Poster Presentations
Constraining QCD multijet background in the t-channel single top-quark production at √s = 13 TeV
PoS(TOP2015)059, Proceedings of the 8th International Workshop on Top Quark Physics, Ischia, 09/2015

Measurement of the top quark pair production cross section using dilepton events at √s = 5.02 TeV
General Scientific Meeting 2016 of the Belgian Physical Society, Gent, 05/2016

Luminosity calibration at √s = 5.02 TeV
When the M meets the P, Louvain-la-Neuve, 12/2016

Luminosity calibration at √s = 5.02 TeV
LHC students poster session during the 129th LHCC Meeting, Geneva, 02/2017

Observation of top quark production in proton-nucleus collisions
LHC students poster session during the 133rd LHCC Meeting, Geneva, 02/2018

Observation of top quark production in proton-nucleus collisions
XXVIIth International Conference on Ultra-relativistic Nucleus-Nucleus Collisions (QM18), Venice, 05/2018
Seminar Presentations
Measurement of the top quark pair production cross section and luminosity calibration at √s = 5.02 TeV
Lunch Seminars and Journal Clubs, Louvain-la-Neuve, 09/2016

Top quark production in nuclear collisions
Lunch Seminars and Journal Clubs, Louvain-la-Neuve, 10/2017
Projects
Research directions:
Data analysis in HEP experiments
Detector commissioning, operation and data processing

Experiments and collaborations:
CMS

Active projects
Fast Simulation of the CMS experiment
Andrea Giammanco

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.
Luminosity calibration of the CMS detector
Andrea Giammanco

We contribute to the offline absolute calibration of the luminometry system of the CMS detector, by analysing the dedicated "Van der Meer scan" data at different center-of-mass energies and collision types (p-p, p-Pb, Pb-Pb).

As a related task, we also contribute to the data-driven inference of the true amount of "pile-up" collisions.

External collaborators: CMS Luminosity Physics Object Group.
Single top studies at LHC
Andrea Giammanco

The electroweak production cross section of single top quarks is an important measurement for LHC, being a potential window on "new physics" effects.
Past achievements of this group include the very first measurement at 7 TeV (in t channel) with 2010 data, followed by the most precise inclusive cross section measurements of t-channel cross section at 7, 8 and 13 TeV, and the first differential measurements at 13 TeV; the most precise |Vtb| extraction from single top in the world; the first measurement of W-helicity fractions in a single-top topology; the first observation of the tW production mode; the first measurement of single-top polarization in t channel; stringent limits on anomalous tWb, tgu, tgc couplings.

External collaborators: CMS collaboration.
Testing the sign of the coupling of the new H(125) boson to top quarks with the CMS data
Andrea Giammanco

During 2012, the CMS and ATLAS collaborations independently reported unambiguous evidence of the existence of a new particle of mass around 125 GeV.
Several analyses are ongoing to challenge the hypothesis that the new particle is the SM Higgs. We focus on the search for its production in association with a single top quark. Due to an effect of quantum interference, this process is strongly suppressed in the Standard Model while it gets enhanced if its couplings to the top quark and to the W boson have opposite sign. An observation of this production mode would therefore be a convincing proof that this new particle does not belong to the Standard Model.
We published the first search for this process using 8 TeV data, and we expect to achieve sensitivity to anomalous values of the top Yukawa phase during the LHC Run-II.

External collaborators: CMS collaboration.
Top quarks in Heavy Ion collisions and other non-standard LHC datasets
Andrea Giammanco

The top quark, being the heaviest known elementary particle, is a powerful tool to test QCD.
The study of top quark pair production in Heavy Ion collisions at the LHC, making use of the dedicated Pb-Pb and p-Pb runs, will open a new road in the investigation of the Quark-Gluon Plasma.

This research project started with the first measurement of top-pair cross section in pp collisions at 5.02 TeV, taking advantage of a "reference run" in Nov.2015. This measurement, in addition to being useful as a reference for measurements in Pb-Pb and p-Pb collisions at the same center-of-mass energy per nucleon, also provides a significant broadening of the lever arm for global PDF fits making use of top-quark data.

More recently we reported the first observation of top quark production in p-Pb collisions, using the data at 8.16 TeV taken in Nov.2016, testing the models of nuclear modification of the gluon PDF at high Bjorken-x.

We are now preparing future analyses in PbPb collisions. We are also interested in differential analyses in pPb collisions (to constrain nuclear PDFs) and in searches in central exclusive production pp events.

External collaborators: David D'Enterria, Pedro Silva and Marta Verweij (CERN).
Publications in CP3
All my publications on Inspire

Number of publications as CP3 member: 24 Download BibTeX

Last 5 publications

2018

CP3-18-80: New physics searches with heavy-ion collisions at the LHC
Bruce, Roderik and others

[Abstract] [PDF]
17 pages, 4 figures. A slightly reduced version of this document has been submitted as input to the update of the European Particle Physics Strategy (EPPS)
December 20.
CP3-18-75: Constraining nuclear parton distributions with heavy ion collisions at the HL-LHC with the CMS experiment
CMS Collaboration

[Full text]
Physics Analysis Note CMS-PAS-FTR-18-027, Used as Input to the Yellow Report 2018 on the HL-LHC and HE-LHC
December 17.
CP3-18-74: Future physics opportunities for high-density QCD at the LHC with heavy-ion and proton beams
Working Group 5 (HL-LHC, HE-LHC)

[Abstract] [PDF] [Full text]
Yellow Report from Working Group 5 on the Physics of the HL-LHC, and Perspectives at the HE-LHC, to be posted to the European Strategy Group
December 15.
CP3-18-67: Search for associated production of a Higgs boson and a single top quark in proton-proton collisions at $sqrt{s} =$ 13 TeV
Sirunyan, Albert M and others

[Abstract] [PDF]
Submitted to Phys. Rev. D
Refereed paper. November 27.
CP3-18-44: Search for the associated production of a Higgs boson and a single top quark in pp collisions at sqrt(s)=13 TeV
CMS Collaboration

[Full text]
Physics Analysis Summary HIG-18-009, Presented at the XXXIX International Conference on High Energy Physics, ICHEP 2018, Seoul, South Korea, 4-11 July, 2018
Public experimental note. July 6.

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