The Lightest Massive Invisible Particles at the LHC
arXiv:1209.6627 · doi:10.1016/j.nuclphysb.2013.06.001
Abstract
The observation of new physics events with large missing transverse energy at the LHC would potentially serve as evidence for the direct production of dark matter. A crucial step toward verifying such evidence is the measurement of the would-be dark matter mass. If, for example, the invisible particles are found to have masses consistent with zero, it may prove very challenging to ascertain whether light dark matter or neutrinos are being observed. We assume that new invisible particles are pair-produced in a ttbar-like topology and use two MT2-based methods to measure the masses of the particles associated with the missing energy. Instead of simulating events and backgrounds, we estimate the uncertainty associated with measuring the mass of the invisible particle by assuming a fixed value of the uncertainty associated with the location of the MT2 endpoint. We find that if this uncertainty associated with measuring the MT2 endpoints is, quite optimistically, O(1 GeV), the invisible particles must have masses greater than O(10 GeV) so they can be distinguished from massless ones at 95% CL. If the results from the CoGeNT, DAMA/LIBRA, and CRESST experiments have indeed revealed the existence of light dark matter with mass O(10 GeV), our results suggest that it may be difficult for the LHC to distinguish dark matter from neutrinos solely via mass measurements.
12 pages, 20 figures
References in corpus (17)
- First results from DAMA/LIBRA and the combined results with DAMA/NaI
- New results from DAMA/LIBRA
- Results from a Search for Light-Mass Dark Matter with a P-type Point Contact Germanium Detector
- Gluino Stransverse Mass
- Measuring superparticle masses at hadron collider using the transverse mass kink
- Using Subsystem MT2 for Complete Mass Determinations in Decay Chains with Missing Energy at Hadron Colliders
- Minimal Kinematic Constraints and MT2
- A Review of the Mass Measurement Techniques proposed for the Large Hadron Collider
- Inclusive transverse mass analysis for squark and gluino mass determination
- Novel reconstruction technique for New Physics processes with initial state radiation
- A New Method for Resolving Combinatorial Ambiguities at Hadron Colliders
- NLSP Gluino Search at the Tevatron and early LHC
- Light neutralino dark matter in the MSSM and its implication for LHC searches for staus
- Controlling ISR in sparticle mass reconstruction
- Extracting the Dark Matter Mass from Single Stage Cascade Decays at the LHC
- General analysis of signals with two leptons and missing energy at the Large Hadron Collider
- Fake Dark Matter at Colliders