Abstract
Final states involving tau leptons are important components of searches for new particles at the Large Hadron Collider (LHC). A proper treatment of tau spin effects in the Monte Carlo (MC) simulations is important for understanding the detector acceptance as well as for the measurements of tau polarization and tau spin correlations. In this note we present a TauSpinner package designed to simulate the spin effects. It relies on the availability of the four-momenta of the taus and their decay products in the analyzed data. The flavor and the four-momentum of the boson decaying to the tau-tau+ or tau+- nu pair need to be known. In the Z/gamma* case the initial state quark configuration is attributed from the intermediate boson kinematics, and the parton distribution functions (PDF's). TauSpinner is the first algorithm suitable for emulation of tau spin effects in tau-embedded samples. It is also the first tool that offers the user the flexibility to simulate a desired spin effect at the analysis level. An algorithm to attribute tau helicity states to a previously generated sample is also provided.
Highlights
Tau leptons are an excellent signature with which to probe new physics at the Large Hadron Collider (LHC)
Tau leptons are an excellent signature with which to probe new physics at the LHC. They have the largest coupling to the Higgs boson both in the Standard Model (SM) and the Minimal Supersymmetric Standard Model (MSSM)
In this note we present a TauSpinner package, which is a Monte Carlo (MC) program designed to generate tau spin effects in any tau sample provided their origin is known
Summary
They have the largest coupling to the Higgs boson both in the Standard Model (SM) and the Minimal Supersymmetric Standard Model (MSSM) Their short-enough lifetime and parity-violating decays allow for their spin information to be preserved in the decay product kinematics recorded in the detector. Since the tau spin effects affect the overall acceptance of the taus in the detector, a proper treatment of these effects is of great importance for the interpretation of the results as well as feasibility studies of new models. It is key for measurements of tau polarization and tau spin correlations.
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