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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.

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. We then update the result with a new publication making use of the larger statistics collected at the end of 2017. 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.

We then 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. Finally, we provided evidence of top quark production also in Pb-Pb collisions.

We are interested in using future PbPb collision data to probe the time evolution of the QGP using top quarks.

External collaborators: David D'Enterria, Pedro Silva (CERN), Georgios Krintiras (Kansas U.).

Non-active projects

Fast Simulation of the CMS experiment

[link]

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.

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.

Publications in IRMP

All my publications on Inspire

Number of publications as IRMP member: 27
Last 5 publications

2021

CP3-21-66: Measurement of the inclusive $\mathrm{t\bar{t}}$ production cross section in proton-proton collisions at $\sqrt{s}$ = 5.02 TeV

Tumasyan, Armen and others

[Abstract] [PDF] [Journal] [Dial]
Refereed paper. December 20.

2020

CP3-20-33: Test beam demonstration of silicon microstrip modules with transverse momentum discrimination for the future CMS tracking detector

CMS Tracker Collaboration

[Journal] [Full text]
Published in: JINST 13 (2018) 03, P03003, Report number: FERMILAB-PUB-18-385-CMS, CERN-CMS-NOTE-2017-010

O. Bondu5, S. Brochet5, A. Caudron5, S. De Visscher5, B. Francois5, A. Jafari5, J. Cabrera Jamoulle5, M. Komm5, G. Krintiras5, A. Magitteri5, A. Mertens5, D. Michotte5, M. Musich5,, L. Quertenmont5, M. Vidal Marono5,
Refereed paper. July 2.

CP3-20-32: Beam test performance of prototype silicon detectors for the Outer Tracker for the Phase-2 Upgrade of CMS

CMS Tracker Group

[Journal] [Full text]
Published 17 March 2020 • © 2020 CERN for the benefit of the CMS collaboration.
Refereed paper. July 2.

2018

CP3-18-80: New physics searches with heavy-ion collisions at the LHC

Bruce, Roderik and others

[Abstract] [PDF] [Journal] [Dial]
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)
Refereed paper. 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.

More publications

2018

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] [Journal] [Dial]
Published in PRD (DOI: 10.1103/PhysRevD.99.092005 )
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.

CP3-18-43: CMS luminosity measurement using 2016 proton-nucleus collisions at nucleon-nucleon center-of-mass energy of 8.16 TeV

CMS Collaboration

[Full text]
Physics Analysis Note CMS-LUM-17-002, Presented at the XXXIX International Conference on High Energy Physics, ICHEP 2018, Seoul, South Korea, 4-11 July, 2018
Public experimental note. July 6.

CP3-18-32: CMS Luminosity Measurement for the 2017 Data Taking Period

CMS Collaboration

[Full text]
Physics Analysis Note CMS-LUM-17-004, Presented at the 6th Annual Conference on Large Hadron Collider Physics, LHCP18, Bologna, Italy, 4-9 June, 2018
Public experimental note. June 6.

CP3-18-14: Observation of top quark production in proton-nucleus collisions

Georgios Konstantinos Krintiras (On behalf of the CMS Collaboration)

[Abstract] [PDF]
Presented at the 10th International Workshop on Top Quark Physics, Braga, Portugal, September 17-22, 2017
Contribution to proceedings. January 29.

CP3-18-13: Study of the top quark production in complementary phase space regions and impact on PDFs in CMS

Georgios Konstantinos Krintiras (On behalf of the CMS Collaboration)

[Abstract] [PDF]
Presented at the Rencontres de Blois 2017, Blois, France, May 28-June 2, 2017
Contribution to proceedings. January 29.

CP3-18-12: Associated production of top quarks with the Higgs boson at 13 TeV

Georgios Konstantinos Krintiras (On behalf of the CMS Collaboration)

[Abstract] [PDF]
Presented at the XXV International Workshop on Deep-Inelastic Scattering and Related Subjects, Birmingham, UK, 3-7 April 2017
Contribution to proceedings. January 29.

CP3-18-11: Constraining QCD multijet background in the t-channel single-top quark production at 13 TeV

Georgios Konstantinos Krintiras (on behalf of the CMS Collaboration)

[Abstract] [PDF]
Presented at the 8th International Workshop on Top Quark Physics, TOP2015, Ischia, Italy, 14-18 September, 2015
Contribution to proceedings. January 29.

CP3-18-07: Results on TOP physics from CMS

Georgios Konstantinos Krintiras (on behalf of the CMS Collaboration)

[Abstract] [PDF]
Presented at the International Workshop on Future Linear Colliders, LCWS2017, 23-27 October 2017, Strasbourg, France
Contribution to proceedings. January 26.

2017

CP3-17-56: The Phase-2 Upgrade of the CMS Tracker

CMS collaboration

[Full text]
CERN-LHCC-2017-009 ; CMS-TDR-014
Refereed paper. December 13.

CP3-17-47: Measurement of the inclusive $ mathrm{t}overline{mathrm{t}} $ cross section in pp collisions at $ sqrt{s}=5.02 $ TeV using final states with at least one charged lepton

Sirunyan, A. M. and others

[Abstract] [PDF] [Journal] [Dial]
Refereed paper. November 10.

CP3-17-39: Observation of top quark production in proton-nucleus collisions

Sirunyan, Albert M and others

[Abstract] [PDF] [Journal] [Dial]
Refereed paper. September 22.

CP3-17-10: Inclusive tt cross section at sqrt(s)=5.02 TeV using final states with at least one charged lepton

CMS collaboration

[Full text]
CMS Physics Analysis Note TOP-16-023, presented at the 25th edition of DIS, Birmingham
April 4.

CP3-17-09: CMS Luminosity Measurement for the 2016 Data Taking Period

CMS Collaboration

[Full text]
Physics Analysis Note CMS-LUM-17-001
Public experimental note. March 26.

2016

CP3-16-56: CMS Luminosity Calibration for the pp Reference Run at sqrt(s) = 5.02 TeV

CMS Collaboration

[Full text]
Physics Analysis Note CMS-LUM-16-001
Public experimental note. December 1.

CP3-16-46: Cross section measurement of $t$-channel single top quark production in pp collisions at $sqrt s =$ 13 TeV

Sirunyan, Albert M and others

[Abstract] [PDF] [Journal] [Dial]
Most precise measurement of the single-top cross section at 13 TeV.
Refereed paper. Public experimental note. October 4.

CP3-16-33: First measurement of the top quark pair production cross section in proton-proton collisions at sqrt(s)=5.02 TeV

CMS collaboration

[Full text]
CMS Physics Analysis Note TOP-16-015, presented at LHCP2016
Public experimental note. June 16.

CP3-16-17: Measurement of the differential cross section for t-channel single-top-quark production at sqrt(s)=13 TeV

CMS Collaboration

[Full text]
CMS Physics Analysis Summary CMS-TOP-16-004
Public experimental note. April 27.

CP3-16-10: Measurement of the inclusive cross section of single top-quark production in the t-channel at 13 TeV

CMS collaboration

[Full text]
Public experimental note. March 25.

2015

CP3-15-31: Measurement of the t-channel single top-quark cross section at 13 TeV

CMS collaboration

[Full text]
Physics Analysis Summary TOP-15-004
Public experimental note. September 14.

CP3-15-22: First look at top-quark selections with 13 TeV data

CMS collaboration

[Full text]
CMS Detector Performance Note released in occasion of the EPS-HEP 2015 conference
Public experimental note. July 24.

Further Material

Bachelor (Ptychion) in Nuclear and Particle Physics

Elliptic Flow of $Formula: 0$ , $Formula: 1$ + $Formula: 2$ in the 20-40% most central PbPb collisions at √s = 2.76 TeV measured with the ALICE Detector at LHC, Lund, 2012 (Thesis)

CERN Summer Student Programme 2014

Testing the Boosted Decision Trees (BDT) performance for $Formula: 0$ + $Formula: 1$ identification in PbPb collisions within the Heavy Ion Jet INteraction Generator (HIJING) model, Geneva, 2014 (Theses)
Testing the Boosted Decision Trees (BDT) performance for $Formula: 2$ + $Formula: 3$ identification in PbPb collisions within the Heavy Ion Jet INteraction Generator (HIJING) model, Geneva, 2014 (Presentation)

MSc in Particle and AstroParticle Physics

Higher-Order Azimuthal Anisotropy of $Formula: 0$ + $Formula: 1$ hyperons in PbPb collisions at √s = 2.76 TeV measured with the ALICE Detector at LHC, Amsterdam, 2015 (Thesis)
Higher Harmonics in azimuthal Anisotropy of identified particles, Amsterdam, 2015 (Presentation)

Miscellaneous

CMS Create #2

An interactive exhibit contest for the public visit experience at CMS, Geneva, 10/2016

Présentations pour la Voyage au CERN 2017

Introduction à la physique des ions lourds et à ALICE, Louvain-la-Neuve, 03/2017

CMS official guide (contact me ;D)

CMS is the only experiment where you can visit the underground facilities during the LHC running period, Geneva, 06/2017