Author: Andrey LoginovPublisher:
ISBN:
Category :
Languages : en
Pages : 10
Book Description
Searches for New Physics in Photon Final States
Author: Andrey LoginovSearch for New Phenomena in Monophoton Final States in Proton-proton Collisions at [mml
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 23
Book Description
In this paper, results are presented from a search for new physics in final states containing a photon and missing transverse momentum. The data correspond to an integrated luminosity of 19.6 fb-1 collected in proton-proton collisions at √s = 8 TeV with the CMS experiment at the LHC. No deviation from the standard model predictions is observed for these final states. New, improved limits are set on dark matter production and on parameters of models with large extra dimensions. In particular, the first limits from the LHC on branon production are found and significantly extend previous limits from LEP and the Tevatron. Finally, an upper limit of 14.0 fb on the cross section is set at the 95% confidence level for events with a monophoton final state with photon transverse momentum greater than 145 GeV and missing transverse momentum greater than 140 GeV.
Search for New Physics in Final States with Low Transverse Energy Photon and Missing Transverse Energy in Proton-proton Collisions at $\sqrt{s}
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 121
Book Description
A search for new physics in the [gamma]+ET nal state is performed using pp collision data corresponding to an integrated luminosity of 7.3 fb-1 collected at √s = 8 TeV using low threshold triggers in a phase space region de ned by ET > 45 GeV and ET > 40 GeV.
Search for New Physics in tt ̅ Final States with Additional Heavy-Flavor Jets with the ATLAS Detector
Author: Javier Montejo BerlingenPublisher: Springer
ISBN: 3319410512
Category : Science
Languages : en
Pages : 288
Book Description
This doctoral thesis focuses on the search for new phenomena in top-antitop quark (tt) final states with additional b-quark jets at the LHC. It uses the full Run 1 dataset collected by the ATLAS experiment in proton-proton collisions at √s=8 TeV. The final state of interest consists of an isolated lepton, a neutrino and at least six jets with at least four b-tagged jets, a challenging experimental signature owing to the large background from tt+heavy-flavor production. This final state is characteristic of ttH production, with the Higgs boson decaying into bb, a process that allows direct probing of the top-Higgs Yukawa coupling. This signature is also present in many extensions of the Standard Model that have been proposed as solutions to the hierarchy problem, such as supersymmetry or composite Higgs models, which predict the pair production of bosonic or fermionic top quark partners, or the anomalous production of four-top-quark events. All these physics processes have been searched for using an ambitious search strategy that has been developed on the basis of a combination of state-of-art theoretical predictions and a sophisticated statistical analysis to constrain in-situ the large background uncertainties. As a result, the most restrictive bounds to date on the above physics processes have been obtained.
A Model Independent Search for New Physics in Final States Containing Leptons at the DO Experiment
Author: Joel M. PiperPublisher:
ISBN:
Category : Leptons (Nuclear physics)
Languages : en
Pages : 648
Book Description
Search for New Phenomena in Monophoton Final States in Proton{u2013}proton Collisions at
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 23
Book Description
In this paper, results are presented from a search for new physics in final states containing a photon and missing transverse momentum. The data correspond to an integrated luminosity of 19.6 fb-1 collected in proton–proton collisions at √s = 8 TeV with the CMS experiment at the LHC. No deviation from the standard model predictions is observed for these final states. New, improved limits are set on dark matter production and on parameters of models with large extra dimensions. In particular, the first limits from the LHC on branon production are found and significantly extend previous limits from LEP and the Tevatron. Finally, an upper limit of 14.0 fb on the cross section is set at the 95% confidence level for events with a monophoton final state with photon transverse momentum greater than 145 GeV and missing transverse momentum greater than 140 GeV.
Searches for New Physics at the Tevatron in Photon and Jet Final States
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 7
Book Description
We present the results of searches for non-standard model phenomena in photon and jet final states. These searches use data from integrated luminosities of 0.7-2.7 fb−1 of p{bar p} collisions at (square root)s = 1.96 TeV, collected with the CDF and D0 detectors at the Fermilab Tevatron. No significant excess in data has been observed. We report limits on the parameters of several models, including: large extra dimension, compositeness, leptoquarks, and supersymmetry.
QCD Higher-Order Effects and Search for New Physics
Author: Jian WangPublisher: Springer
ISBN: 3662486733
Category : Science
Languages : en
Pages : 153
Book Description
This book mainly investigates the precision predictions on the signal of new physics at the Large Hadron Collider (LHC) in the perturbative Quantum Chromodynamics (QCD) scheme. The potential of the LHC to discover the signal of dark matter associated production with a photon is studied after including next-to-leading order QCD corrections. The factorization and resummation of t-channel top quark transverse momentum distribution in the standard model at both the Tevatron and the LHC with soft-collinear effective theory are presented. The potential of the early LHC to discover the signal of monotops is discussed. These examples illustrate the method of searching for new physics beyond what is known today with high precision.
Towards New Milestones In Our Quest To Go Beyond The Standard Model - Proceedings Of The International School Of Subnuclear Physics
Author: Antonino ZichichiPublisher: World Scientific
ISBN: 9814472328
Category : Science
Languages : en
Pages : 457
Book Description
This volume is a collection of lectures given by distinguished physicists from around the world, covering the most recent advances in theoretical physics and the latest results from current experimental facilities.Following one of the principal aims of the School — to encourage and promote young physicists to achieve recognition at an international level — the students who distinguished themselves for the excellence of their research were given the opportunity to publish their presentations in this volume.
Author: Yee chinn Yap