Designing and recasting LHC analyses with MadAnalysis 5

102

109

Long-lived light particles (LLLPs) appear in many extensions of the standard model. LLLPs are usually motivated by the observed small neutrino masses, by dark matter or both. Typical examples for fermionic LLLPs (a.k.a. heavy neutral fermions, HNFs) are sterile neutrinos or the lightest neutralino in R-parity violating supersymmetry. The high luminosity LHC is expected to deliver up to 3/ab of data. Searches for LLLPs in dedicated experiments at the LHC could then probe the parameter space of LLLP models with unprecedented sensitivity. Here, we compare the prospects of several recent experimental proposals, FASER, CODEX-b and MATHUSLA, to search for HNFs and discuss their relative merits.s

Section: Jhep07(2018)056mentioning

confidence: 99%

Heavy neutral fermions at the high-luminosity LHC

Helo

Hirsch

Wang³

2018

102

109

“…The entire process of event-analysis is done within the modular and integrated framework of the popular package of MadAnalysis 5 (v1.1.11) [133,134] with the help of the in-built data analysis framework ROOT (v5. 34.22) [135] using the event format STDHEP [136].…”

Section: Jhep09(2015)073mentioning

confidence: 99%

Two light stops in the NMSSM and the LHC

Beuria

Chatterjee

Datta

et al. 2015

Abstract:We study the viability of having two relatively light top squarks ('stops') in the framework of the Next-to-Minimal Supersymmetric Standard Model (NMSSM). Such light stops render the NMSSM rather 'natural'. These are shown to be allowed by the relevant direct searches at the Large Hadron Collider (LHC) and to be compatible with the latest LHC results on the Higgs sector, other low energy electroweak constraints and recent constraints from the dark matter (DM) sector. We propose dedicated searches for such light stops at the LHC within a 'simplified' scenario that may have a bino-like or a singlino-like neutralino LSP as the DM candidate and point out various final states carrying the imprint of their collective presence. Under certain circumstances, in such a scenario, presence of two light stops may give rise to final states which are not so typical in their search. Thorough studies at the detector level reveal the status of such a scenario after the 8 TeV run of the LHC and shed light on the prospects of its 13 and 14 TeV runs. In favorable regions of the NMSSM parameter space, with low-lying spectra, signals with significance 5σ are possible with a few tens to a few hundreds of fb −1 of integrated luminosity in diverse final states.

“…The events are then passed to Pythia8 [108] for parton showering and hadronization, and the fast detector simulation in Delphes3 (ATLAS settings) [109] is used to include the detector effects. Finally, events are analyzed with MadAnalysis5 [110][111][112].…”

Section: Jhep03(2017)137mentioning

confidence: 99%

Higgs boson pair productions in the Georgi-Machacek model at the LHC

Chang

Chen

Chiang

2017

Higgs bosons pair production is well known for its sensitivity to probing the sign and size of Higgs boson self coupling, providing a way to determine whether there is an extended Higgs sector. The Georgi-Machacek (GM) model extends the Standard Model (SM) with an SU(2) L triplet scalar field that has one real and one complex components. The Higgs self coupling now has a wider range than that in the SM, with even the possibility of a sign flip. The new heavy singlet Higgs boson H 0 1 can contribute to s-channel production of the hh pairs. In this work, we study non-resonant/resonant Higgs boson pair productions pp → hh and pp → H 0 1 → hh, focusing exclusively on the contribution of H 0 1 . We show the sensitivity for Higgs boson pair production searches at the 13-TeV LHC with the luminosities of 3.2, 30 and 100 fb −1 .