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Contact

Name

Andrey Popov

Position

Former member
Member from November 2012 to October 2015
Current position: Postdoc at IPNL (Lyon, France)

Projects

Research directions:

Data analysis in HEP, astroparticle and GW experiments
Detector commissioning, operation and data processing

Experiments and collaborations:

CMS

Active projects

Single top studies at LHC

[link]

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.

Non-active projects

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.

Triggers for top quark physics

Andrea Giammanco

Our group is involved in the trigger design and maintenance for the LHC Run II in order to select the most interesting collision events for topologies with a lepton and a b quark with the CMS detector. Given the final state, this trigger is of particular interest for top quark physics, but it is also relevant to many other analyses (including the single top plus Higgs search ongoing in our group). Studies are carried out to implement the latest CMS developments in physics object definitions into the trigger path as well as to optimize the selections for the best efficiency and the rate possible. Our group is responsible for the b-tagging part together with organizing the whole activities within the CMS top quark group. Andrey Popov is official contact person between the Top Quark group and the Trigger group.

External collaborators: CMS TOP PAG, CMS TSG.

Publications in IRMP

All my publications on Inspire

Number of publications as IRMP member: 9
Last 5 publications

2015

CP3-15-33: Search for the associated production of a Higgs boson with a single top quark in proton-proton collisions at $ sqrt{s}=8 $ TeV

Khachatryan, Vardan and others

[Abstract] [PDF] [Journal] [Dial]
Refereed paper. September 29.

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.

2014

CP3-14-76: Identification of signal events in a search for H->bb produced in association with single top quarks

Andrey Popov on behalf of the CMS collaboration

[Abstract] [PDF]
To appear in proceedings of TOP2014
Contribution to proceedings. November 28.

CP3-14-75: Measurements of single top-quark production in pp collisions by the CMS experiment

Andrey Popov on behalf of the CMS collaboration

[Abstract] [PDF]
To appear in proceedings of CKM2014
Contribution to proceedings. November 28.

CP3-14-65: Search for $H\to b\bar b$ in association with single top quarks as a test of Higgs couplings

CMS Collaboration

[Full text]
CMS Physics Analysis Summary HIG-14-015
Public experimental note. September 30.

More publications

2014

CP3-14-35: Analysis of t-channel single top-quark production with Bayesian neural networks in CMS experiment at sqrt(s) = 7 TeV with L = 5/fb

E. Boos, V. Bunichev, L. Dudko, N. Tsirova, A. Markina, M. Perfilov, A. Popov, I. Myagkov, I. Shvetsov, G. Vorotnikov, S. Bitioukov, D. Konstantinov, A. Giammanco, J. Hansen, J. Komaragiri, D. Martschei, Th. Muller, J. Ott, T. Peiffer, S. Rocker, J. Wagner-Kuhr, A. O. M. Iorio, M. Merola, L. Lista, A. Jafari

[Full text]
Analysis Note AN-2012/291 in support of CMS-TOP-14-007
Private experimental note. June 12.

CP3-14-32: Search for anomalous Wtb couplings and top FCNC in t-channel single-top-quark events

CMS Collaboration

[Full text]
CMS-PAS-TOP-14-007
Public experimental note. June 9.

CP3-14-26: Search for H->bb in association with single top quarks as a test of Higgs boson couplings

A. Anuar, A. Bean, K. Bloom, C. Boeser, T. Chwalek, S. Fink, A. Giammanco, R. Gonzalez Suarez, D. Knowlton, J. Komaragiri, M. Komm, B. Maier, D. Noonan, A. Popov, J. Wagner-Kuhr

[Full text]
Analysis Note AN-2013/113 in support of CMS-HIG-14-015
Private experimental note. June 7.

2013

CP3-13-48: Measurement of top quark polarization in t-channel single-top production

T. Chwalek, A. Giammanco, A. O. M. Iorio, M. Kadastik, M. Komm, D. Konstantinov, J. Pata, M. Piibeleht, A. Popov, L. Rebane, A. Remm, S. Roecker, A. Tiko, F. Roscher, J. Wagner-Kuhr

[Full text]
Supporting note for CMS-TOP-13-001
Private experimental note. September 23.