Research in High Energy Physics
Lead Research Organisation:
Imperial College London
Department Name: Physics
Abstract
Investigation into the properties of elementary particles and the fundamental forces of nature. Precision tests of the Standard Model (SM); searches for new phenomena and extensions to the SM; studies of CP violation in the b-system; measurement of neutrino oscillation parameters; WIMP dark matter searches, preparations for future experiments, including HL-LHC, feasibility studies for future neutrino factories, double-beta decay experiments, gravitational wave detectors and linear colliders.
Organisations
People |
ORCID iD |
Alexander Tapper (Primary Supervisor) | |
Vilius CEPAITIS (Student) |
Publications
Sirunyan A
(2021)
Search for top squarks in final states with two top quarks and several light-flavor jets in proton-proton collisions at s = 13 TeV
in Physical Review D
Sirunyan A
(2021)
Evidence for electroweak production of four charged leptons and two jets in proton-proton collisions at s = 13 TeV
in Physics Letters B
Sirunyan AM
(2021)
Measurements of angular distance and momentum ratio distributions in three-jet and Z + two-jet final states in pp collisions.
in The European physical journal. C, Particles and fields
Sirunyan AM
(2021)
Measurement of the Higgs boson production rate in association with top quarks in final states with electrons, muons, and hadronically decaying tau leptons at s = 13 TeV.
in The European physical journal. C, Particles and fields
Sirunyan A
(2021)
Hard color-singlet exchange in dijet events in proton-proton collisions at s = 13 TeV
in Physical Review D
CMS Collaboration
(2021)
MUSiC: a model-unspecific search for new physics in proton-proton collisions at s = 13 TeV.
in The European physical journal. C, Particles and fields
Sirunyan A
(2021)
Measurement of prompt D0 and D ? 0 meson azimuthal anisotropy and search for strong electric fields in PbPb collisions at s NN = 5.02 TeV
in Physics Letters B
Sirunyan A
(2021)
Search for lepton-flavor violating decays of the Higgs boson in the µ t and e t final states in proton-proton collisions at s = 13 TeV
in Physical Review D
Sirunyan A
(2021)
Search for the lepton flavor violating decay t ? 3µ in proton-proton collisions at $$ \sqrt{\mathrm{s}} $$ = 13 TeV
in Journal of High Energy Physics
Sirunyan A
(2021)
Search for top squark production in fully hadronic final states in proton-proton collisions at s = 13 TeV
in Physical Review D
Sirunyan AM
(2021)
Search for charged Higgs bosons produced in vector boson fusion processes and decaying into vector boson pairs in proton-proton collisions at s = 13 TeV.
in The European physical journal. C, Particles and fields
Sirunyan A
(2021)
Search for W' bosons decaying to a top and a bottom quark at s = 13 TeV in the hadronic final state
in Physics Letters B
Sirunyan AM
(2021)
Precision luminosity measurement in proton-proton collisions at s = 13 TeV in 2015 and 2016 at CMS.
in The European physical journal. C, Particles and fields
Sirunyan A
(2021)
First measurement of the cross section for top quark pair production with additional charm jets using dileptonic final states in pp collisions at s = 13 TeV
in Physics Letters B
Sirunyan AM
(2021)
Search for top squark pair production using dilepton final states in pp collision data collected at s = 13 TeV.
in The European physical journal. C, Particles and fields
Sirunyan AM
(2021)
Observation of Forward Neutron Multiplicity Dependence of Dimuon Acoplanarity in Ultraperipheral Pb-Pb Collisions at sqrt[s_{NN}]=5.02 TeV.
in Physical review letters
Sirunyan A
(2021)
Search for dark photons in Higgs boson production via vector boson fusion in proton-proton collisions at $$ \sqrt{s} $$ = 13 TeV
in Journal of High Energy Physics
Sirunyan A
(2021)
Measurement of the CP-violating phase ?s in the B s 0 ? J / ? ? ( 1020 ) ? µ + µ - K + K - channel in proton-proton collisions at s = 13 TeV
in Physics Letters B
Sirunyan AM
(2021)
Observation of a New Excited Beauty Strange Baryon Decaying to ?_{b}^{-}p^{+}p^{-}.
in Physical review letters
Tumasyan A
(2021)
Measurement of the electroweak production of Z ? and two jets in proton-proton collisions at s = 13 TeV and constraints on anomalous quartic gauge couplings
in Physical Review D
Sirunyan A
(2021)
Development and validation of HERWIG 7 tunes from CMS underlying-event measurements
in The European Physical Journal C
Sirunyan A
(2021)
Search for long-lived particles decaying to jets with displaced vertices in proton-proton collisions at s = 13 TeV
in Physical Review D
Sirunyan A
(2021)
Search for the rare decay of the W boson into a pion and a photon in proton-proton collisions at s = 13 TeV
in Physics Letters B
Sirunyan AM
(2021)
Constraints on the Initial State of Pb-Pb Collisions via Measurements of Z-Boson Yields and Azimuthal Anisotropy at sqrt[s_{NN}]=5.02 TeV.
in Physical review letters
Sirunyan A
(2021)
Measurement of the W ? Production Cross Section in Proton-Proton Collisions at s = 13 TeV and Constraints on Effective Field Theory Coefficients
in Physical Review Letters
Studentship Projects
Project Reference | Relationship | Related To | Start | End | Student Name |
---|---|---|---|---|---|
ST/R504816/1 | 01/10/2017 | 30/09/2021 | |||
1963036 | Studentship | ST/R504816/1 | 01/10/2017 | 04/06/2021 | Vilius CEPAITIS |
Description | The Large Hadron Collider (LHC) is the most powerful particle accelerator ever built. The CMS experiment at the LHC analyses proton-proton collisions, and was one of the projects responsible for the discovery of the Higgs boson. The discovery of the Higgs boson completed and validated the Standard Model (SM) of particle physics. However, while many efforts have been invested in this direction, no other new fundamental particle has been discovered at the LHC. Such beyond-the-SM particles may be long-lived and leave exotic signatures in the detector which are hard to reconstruct. In the work funded by this award, state-of-the-art machine learning techniques were employed to develop an algorithm capable of detecting and identifying the decay products of such long-lived particles. |
Exploitation Route | The developments of this work are being employed by the CMS Collaboration in further searches for long-lived particles. |
Sectors | Digital/Communication/Information Technologies (including Software),Other |
Description | 4th ATLAS Machine Learning Workshop |
Form Of Engagement Activity | A talk or presentation |
Part Of Official Scheme? | No |
Geographic Reach | International |
Primary Audience | Professional Practitioners |
Results and Impact | I gave an invited talk on behalf of the CMS collaboration on a deep-neural-network based tagger to search for long-lived particles, which was mainly developed at Imperial College. The audience, consisting mainly of other particle physicists from ATLAS, was very interested in our novel approach and how it could be applied at their experiment. |
Year(s) Of Engagement Activity | 2019 |
URL | https://indico.cern.ch/event/844092/ |
Description | CERN Open Days |
Form Of Engagement Activity | Participation in an open day or visit at my research institution |
Part Of Official Scheme? | No |
Geographic Reach | International |
Primary Audience | Public/other audiences |
Results and Impact | Several thousand visitors were hosted at the CMS experiment, many of them from the UK. The most memorable part for most visitors was the visit underground, as it was a rare opportunity to see one of the most sophisticated experiments ever built from close by. |
Year(s) Of Engagement Activity | 2019 |
URL | https://opendays.cern |
Description | Presentation at the 6th LHC long-lived particle workshop |
Form Of Engagement Activity | A talk or presentation |
Part Of Official Scheme? | No |
Geographic Reach | International |
Primary Audience | Professional Practitioners |
Results and Impact | I gave a presentation about a deep neural network based tagger to search for long-lived particles on behalf of the CMS collaboration. This tool was developed mainly at Imperial College and is inspired by state-of-the-art machine learning techniques. |
Year(s) Of Engagement Activity | 2019 |
URL | https://indico.cern.ch/event/849129/ |