The degenerate top squark next-to-lightest supersymmetric particle (NLSP) and neutralino (LSP) scenario is well motivated but hard to detect in the collider experiments. We propose a novel signature for detection of this scenario at the Large Hadron Collider and demonstrate its feasibility. In the constrained minimal supersymmetric standard model and top squark NLSP, gluinos are in general much heavier than the lighter top squark and, thus, it decays dominantly to high transverse momentum (p(T)) top-quark-top-squark pairs. We consider gluino pair production and study two high-p(T) top jets and missing energy as the signature of this scenario.
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http://dx.doi.org/10.1103/PhysRevLett.110.141801 | DOI Listing |
Phys Rev Lett
August 2024
INFN, Laboratori Nazionali di Frascati, Via E. Fermi 40, 00044 Frascati (RM), Italy.
We discuss the possibility that light new physics in the top-quark sample at the LHC can be found by investigating with greater care well-known kinematic distributions, such as the invariant mass m_{bℓ} of the b-jet and the charged lepton in fully leptonic tt[over ¯] events. We demonstrate that new physics can be probed in the rising part of the already measured m_{bℓ} distribution. To this end, we analyze a concrete supersymmetric scenario with a light right-handed top-squark, chargino and neutralino.
View Article and Find Full Text PDFEur Phys J C Part Fields
November 2021
University of Wisconsin-Madison, Madison, WI USA.
A combination of searches for top squark pair production using proton-proton collision data at a center-of-mass energy of 13 at the CERN LHC, corresponding to an integrated luminosity of 137 collected by the CMS experiment, is presented. Signatures with at least 2 jets and large missing transverse momentum are categorized into events with 0, 1, or 2 leptons. New results for regions of parameter space where the kinematical properties of top squark pair production and top quark pair production are very similar are presented.
View Article and Find Full Text PDFEur Phys J C Part Fields
January 2021
University of Wisconsin-Madison, Madison, WI USA.
A search is presented for supersymmetric partners of the top quark (top squarks) in final states with two oppositely charged leptons (electrons or muons), jets identified as originating from quarks, and missing transverse momentum. The search uses data from proton-proton collisions at collected with the CMS detector, corresponding to an integrated luminosity of 137 . Hypothetical signal events are efficiently separated from the dominant top quark pair production background with requirements on the significance of the missing transverse momentum and on transverse mass variables.
View Article and Find Full Text PDFPhys Rev Lett
October 2020
Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom.
In a supersymmetric theory, the IR contributions to the Higgs mass are calculable below the mediation scale Λ_{UV} in terms of the IR field content and parameters. However, logarithmic sensitivity to physics at Λ_{UV} remains. In this Letter, we present a first example of a framework, dictated by symmetries, to supersoften these logarithms from the matter sector.
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