Pinning down the Invisible Sneutrino

Abstract

For points in SUSY parameter space where the sneutrino is lighter than the lightest chargino and next-to-lightest neutralino, its direct mass determination from sneutrino pair production process at e+e- collider is impossible since it decays invisibly. In such a scenario the sneutrino can be discovered and its mass determined from measurements of two-body decays of charginos produced in pairs at the ILC. Using the event generator WHIZARD we study the prospects of measuring sneutrino properties in a realistic ILC environment. In our analysis we include beamstrahlung, initial state radiation, a complete account of reducible backgrounds from SM and SUSY processes, and a complete matrix-element calculation of the SUSY signal which encompasses all irreducible background and interference contributions. We also simulate photon induced background processes using exact matrix elements. Radiation effects and the cuts to reduce background strongly modify the edges of the lepton energy spectra from which the sneutrino and chargino mass are determined. We discuss possible approaches to measure the sneutrino mass with optimal precision.

28 pages, 9 figures, submitted to JHEP

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Cited by in corpus (13)

• WHIZARD: Simulating Multi-Particle Processes at LHC and ILC
• Status of the Higgs Singlet Extension of the Standard Model after LHC Run 1
• Introducing an interface between WHIZARD and FeynRules
• An Analytic Initial-State Parton Shower
• An alternative subtraction scheme for next-to-leading order QCD calculations
• Determining the Dark Matter Particle Mass through Antler Topology Processes at Lepton Colliders
• A Sneutrino NLSP in the $\nu$CMSSM
• Distorted mass edges at LHC from supersymmetric leptoquarks
• Interference effects for the top quark decays $t\to b+W^{+}/H^{+}(\to {\tau }^{+}{\nu }_{\tau })$
• Automation of NLO processes and decays and POWHEG matching in WHIZARD
• The NMSSM implementation in WHIZARD
• WHIZARD 2.2 for Linear Colliders
• Top Physics in WHIZARD