Contact
Name
Hamed Bakhshiansohi
حامد بخشیان
Position
Postdoc. Funding: MOVE-IN.
Member since January 2016
Email
hbakhshern.ch
Address
Centre for Cosmology, Particle Physics and Phenomenology - CP3
Université catholique de Louvain
2, Chemin du Cyclotron - Box L7.01.05
B-1348 Louvain-la-Neuve
Belgium
Phone
+32 10 473217
Office
E.358
My personal homepage
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
All my publications on Inspire

2016

Search for electroweak production of charginos in final states with two tau leptons in pp collisions at sqrt(s) = 8 TeV
CMS Collaboration
[Abstract] [PDF] [Journal] Submitted to JHEP
Report number: CMS-SUS-14-022, CERN-EP-2016-225

Refereed paper. 1st December.
Cross section measurement of t-channel single top quark production in pp collisions at sqrt(s) = 13 TeV
CMS Collaboration
[Abstract] [PDF] Most precise measurement of the single-top cross section at 13 TeV. Submitted to PLB
Refereed paper. Public experimental note. 4th October.
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. 27th April.
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. 25th March.


[UCLouvain] - [SST] [IRMP] - [SC]
Contact : Jérôme de Favereau
Research