Contact
Name
Andrey Popov
Position
Former member
PhD student in CP3 from November 2012 to October 2015
Current position: Postdoc at IPNL (Lyon, France).
Projects
I am involved in the following research directions:

Single top studies at LHC

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

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.

Show past projects.
Publications in CP3
Showing 5 publications over 9. Show all publications.
All my publications on Inspire

2015

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]
Refereed paper. 29th September.
First look at top-quark selections with 13 TeV data
CMS collaboration
CMS Detector Performance Note released in occasion of the EPS-HEP 2015 conference
Public experimental note. 24th July.

2014

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. 28th November.
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. 28th November.
Search for $H\to b\bar b$ in association with single top quarks as a test of Higgs couplings
CMS Collaboration
CMS Physics Analysis Summary HIG-14-015
Public experimental note. 30th September.

Contact : Jérôme de Favereau
Research
Job opportunities PhD Position in Theoretical Particle Physics and Cosmology