Productions and Decays of Short-Lived Particles ine⁺-e^-Colliding Beam Experiments

Exploring anomalous top-quark interactions via the final lepton intt¯productions/decays at hadron colliders

“…In calculating the momentum distributions of the final charged lepton in the partonic level, we utilize the Kawasaki-Shirafuji-Tsai formalism [20,21]. This formalism is quite valuable when we study the momentum distribution of a final-state particle from productions/decays of a heavy particle whose mass m and total width À satisfy m ) À, and consequently ''narrow-width approximation''…”

Tau longitudinal polarization inB¯→Dτν¯and its role in the search for the charged Higgs boson

“…Effects of τ polarization on the τ decay distribution are well-studied for many τ production processes, such as e − e + → τ − τ + [26][27][28][29][30], Z 0 → τ − τ + [31][32][33][34], Higgs decays [34,35], other heavy particle decays [36][37][38], and the ν τ -nucleon scattering [39]. It is shown in the literature that we can decode τ polarizations from appropriate τ decay distributions in these processes.…”

Angular distributions as lifetime probes

“…While here we consider only the s-channel, a polarization vector that diagonalizes the spin density matrix can be found for a variety of different channels [25,27,28]. With this simplification the cross-section without hadronization can be approximated by [29],…”