6533b85efe1ef96bd12bfeb1
RESEARCH PRODUCT
Top quark mass measurement in radiative events at electron-positron colliders
P. GomisA. WidlE. FullanaJuan FusterAndré H. HoangAndré H. HoangVicent MateuVicent MateuM. BoronatMarcel Vossubject
Particle physicsTop quarkNuclear and High Energy PhysicsPhotonInternational Linear ColliderFOS: Physical sciences01 natural sciencesComputer Science::Digital LibrariesHigh Energy Physics - ExperimentHigh Energy Physics - Experiment (hep-ex)PositronHigh Energy Physics - Phenomenology (hep-ph)0103 physical sciencesRadiative transferInvariant mass010306 general physicsPhysicsQuantum chromodynamicsCompact Linear Collider010308 nuclear & particles physicsHigh Energy Physics::PhenomenologyAccelerators and Storage Ringslcsh:QC1-9993. Good healthHigh Energy Physics - PhenomenologyPhysics::Accelerator PhysicsHigh Energy Physics::Experimentlcsh:Physicsdescription
In this letter, we evaluate potential of linear $e^+e^-$ colliders to measure the top quark mass in radiative events and in a suitable short-distance scheme. We present a calculation of the differential cross section for production of a top quark pair in association with an energetic photon from initial state radiation, as a function of the invariant mass of the $t\bar{t}$ system. This {\it matched} calculation includes the QCD enhancement of the cross section around the $t\bar{t}$ production threshold and remains valid in the continuum well above the threshold. The uncertainty in the top mass determination is evaluated in realistic operating scenarios for the Compact Linear Collider (CLIC) and the International Linear Collider (ILC), including the statistical uncertainty and the theoretical and experimental systematic uncertainties. With this method, the top quark mass can be determined with a precision of $110$ MeV in the initial stage of CLIC, with $1$ ab$^{-1}$ at $\sqrt{s} =$ 380 GeV, and with a precision of approximately $150$ MeV at the ILC, with $L = 4$ ab$^{-1}$ at $\sqrt{s}= 500$ GeV. Radiative events allow measurements of the top quark mass at different renormalization scales, and we demonstrate that such a measurement can yield a statistically significant test of the evolution of the MSR mass $m_t^{\rm MSR}(R)$ for scales $R< m_t$.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2020-05-01 |