Contact
Name
Hamed Bakhshiansohi

Position
Former member
Member from January 2016 to August 2018

Personal homepage
Projects
Research directions:
Experiments and collaborations:
Active projects
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.
Publications in CP3
All my publications on Inspire

Number of publications as CP3 member: 11

Last 5 publications

2018

CP3-18-76: Search for an exotic decay of the Higgs boson to a pair of light pseudoscalars in the final state with two muons and two b quarks in pp collisions at 13 TeV
Sirunyan, Albert M and others

[Abstract] [PDF] [Journal] [Dial]
Submitted to Phys. Lett. B.
Refereed paper. December 18.
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.
CP3-18-10: Latest results on Higgs boson →γγ in the CMS experiment
Hamed Bakhshiansohi

[Full text]
International Conference on the Structure and the Interactions of the Photon, including the 22th International Workshop on Photon-Photon Collisions, Geneva, Switzerland, 22 - 26 May 2017
Contribution to proceedings. January 29.
CP3-18-09: Single top quark production measurements in CMS
Hamed Bakhshiansohi

[Full text]
38th International Conference on High Energy Physics (ICHEP2016)
Contribution to proceedings. January 29.

More publications