scholarly journals Search for final states with two leptons and missing transverse energy in p anti-p collisions with a center-of-mass energy of 1.96-TeV

2004 ◽  
Author(s):  
Marc Hohlfeld
Keyword(s):  
Transverse Energy ◽  
Center Of Mass ◽  
Final States ◽  
Mass Energy ◽  
Missing Transverse Energy ◽  
Center Of Mass Energy

scholarly journals Searching for left sneutrino LSP at the LHC

2018 ◽  
Vol 33 (18n19) ◽  
pp. 1850110 ◽  
Author(s):  
Pradipta Ghosh ◽  
Iñaki Lara ◽  
Daniel E. López-Fogliani ◽  
Carlos Muñoz ◽  
Roberto Ruiz de Austri
Keyword(s):  
Transverse Energy ◽  
Center Of Mass ◽  
Mass Range ◽  
Supersymmetric Particle ◽  
Mass Energy ◽  
Missing Transverse Energy ◽  
Significant Evidence ◽  
Center Of Mass Energy ◽  
Parity Breaking ◽  
Integrated Luminosity

We analyze relevant signals expected at the LHC for a left sneutrino as the lightest supersymmetric particle (LSP). The discussion is carried out in the “[Formula: see text] from [Formula: see text]” supersymmetric standard model [Formula: see text], where the presence of [Formula: see text]-parity breaking couplings involving right-handed neutrinos solves the [Formula: see text] problem and reproduces neutrino data. The sneutrinos are pair produced via a virtual [Formula: see text], [Formula: see text] or [Formula: see text] in the [Formula: see text] channel. From the prompt decay of a pair of left sneutrinos LSPs of any family, a significant diphoton signal plus missing transverse energy (MET) from neutrinos can be present in the mass range 118–132 GeV, with 13 TeV center-of-mass energy and an integrated luminosity of 100 fb[Formula: see text]. In addition, in the case of a pair of tau left sneutrinos LSPs, given the large value of the tau Yukawa coupling diphoton plus leptons and/or multileptons can appear. We find that the number of expected events for the multilepton signal, together with properly adopted search strategies, is sufficient to give a significant evidence for a sneutrino of mass in the range 130–310 GeV, even with the integrated luminosity of 20 fb[Formula: see text]. In the case of the signal producing diphoton plus leptons, an integrated luminosity of 100 fb[Formula: see text] is needed to give a significant evidence in the mass range 95–145 GeV. Finally, we discuss briefly the presence of displaced vertices and the associated range of masses.

scholarly journals Prospects for rare and forbidden hyperon decays at BESIII

2017 ◽  
Vol 12 (5) ◽  
Author(s):  
Hai-Bo Li
Keyword(s):  
Rare Decays ◽  
Branching Fractions ◽  
Center Of Mass ◽  
Final States ◽  
Electron Spectrometer ◽  
Mass Energy ◽  
Measurement Sensitivity ◽  
Center Of Mass Energy ◽  
Electron Positron ◽  
Hyperon Decays

Abstract The study of hyperon decays at the Beijing Electron Spectrometer III (BESIII) is proposed to investigate the events of J/ψ decay into hyperon pairs, which provide a pristine experimental environment at the Beijing Electron–Positron Collider II. About 106–108 hyperons, i.e., Λ, Σ, Ξ, and Ω, will be produced in the J/ψ and ψ(2S) decays with the proposed data samples at BESIII. Based on these samples, the measurement sensitivity of the branching fractions of the hyperon decays is in the range of 10−5–10−8. In addition, with the known center-of-mass energy and “tag technique”, rare decays and decays with invisible final states can be probed.

Implementation of the ATLAS-SUSY-2018-32 analysis (sleptons and eletroweakinos with two leptons and missing transverse energy; 139 fb−1)

2020 ◽  
pp. 2141005
Author(s):  
Jack Y. Araz ◽  
Benjamin Fuks
Keyword(s):  
Pair Production ◽  
Transverse Energy ◽  
Center Of Mass ◽  
New Physics ◽  
Missing Transverse Energy ◽  
Missing Energy ◽  
Final State ◽  
Proton Proton ◽  
Weak Boson ◽  
Center Of Mass Energy

We present the implementation in MadAnalysis 5 of the ATLAS-SUSY-2018-32 search for new physics and document the validation of this re-implementation. This analysis targets, with 139 fb[Formula: see text] of proton–proton collisions at a center-of-mass energy of 13 TeV recorded by the ATLAS detector, the electroweak pair production of supersymmetric charginos and sleptons when they further decay into a final state comprising a pair of leptons and missing energy. The validation of our work is based on three [Formula: see text]-parity conserving supersymmetric benchmark setups that feature, respectively, chargino pair-production followed by decays into leptons via an intermediate weak boson, chargino pair-production followed by chargino cascade decays into leptons through a slepton mediator, and slepton pair-production followed by slepton direct decays into leptons.

Implementation of the CMS-EXO-17-015 analysis in the MadAnalysis 5 framework (leptoquark and dark matter with one muon, one jet and missing transverse energy; 77.4 fb−1)

2020 ◽  
pp. 2141002
Author(s):  
Benjamin Fuks ◽  
Adil Jueid
Keyword(s):  
Dark Matter ◽  
Transverse Energy ◽  
Center Of Mass ◽  
Missing Transverse Energy ◽  
Final State ◽  
Proton Proton ◽  
Proton Collisions ◽  
Center Of Mass Energy ◽  
Scalar Leptoquarks ◽  
Proton Proton Collisions

We present an implementation of the CMS-EXO-17-015 analysis in the MadAnalysis 5 framework. The analysis targets a search for dark matter in a channel in which it originates from the production and decay of a pair of scalar leptoquarks. This search considers a luminosity [Formula: see text] of CMS data collected in 2016 and 2017, in proton-proton collisions at a center-of-mass energy of 13 TeV. The final state signature is comprised of one isolated highly-energetic muon, one jet with a large transverse momentum and a significant amount of missing transverse energy. We validate our implementation in MadAnalysis 5 for a specific leptoquark/dark matter benchmark scenario. In particular, we compare predictions obtained with MadAnalysis 5 with the official CMS results for various kinematical distributions relevant for the CMS-EXO-17-015 analysis, as well as detailed cut-flow tables. We have found an excellent agreement.

scholarly journals HiggsBounds-5: testing Higgs sectors in the LHC 13 TeV Era

2020 ◽  
Vol 80 (12) ◽  
Author(s):  
Philip Bechtle ◽  
Daniel Dercks ◽  
Sven Heinemeyer ◽  
Tobias Klingl ◽  
Tim Stefaniak ◽  
...  
Keyword(s):  
Center Of Mass ◽  
Branching Ratio ◽  
Computer Code ◽  
Higgs Bosons ◽  
Final States ◽  
Mass Energy ◽  
The Public ◽  
Center Of Mass Energy ◽  
Higgs Search ◽  
Recent Developments

AbstractWe describe recent developments of the public computer code . In particular, these include the incorporation of LHC Higgs search results from Run 2 at a center-of-mass energy of 13 TeV, and an updated and extended framework for the theoretical input that accounts for improved Higgs cross section and branching ratio predictions and new search channels. We furthermore discuss an improved method used in to approximately reconstruct the exclusion likelihood for LHC searches for non-standard Higgs bosons decaying to $$\tau \tau $$ τ τ final states. We describe in detail the new and updated functionalities of the new version .

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