84 research outputs found
PHOTOS as a pocket parton shower: flexibility tests for the algorithm
In this note we will recall the main tests that document robustness and
flexibility of the PHOTOS design. This aspect may be of broader use and may
find extensions in future applications, also outside the simple case of purely
QED bremsstrahlung in decays. The components of the PHOTOS algorithm will be
presented using operator language. The results of some flexibility tests, not
documented before, will also be presented
TAUOLA the library for tau lepton decay, and KKMC/KORALB/KORALZ/... status report
The status of the Monte Carlo programs for the simulation of the lepton production in high energy accelerator experiments and decay is reviewed. In particular, the status of the following packages is discussed: (i) TAUOLA for tau-lepton decay, (ii) PHOTOS for radiative corrections in decays, (iii) KORALB, KORALZ, KKMC packages for tau-pair production in e+e- collisions and (iv) universal interface of TAUOLA for the decay of tau-leptons produced by``any'' generator. Special emphasis on requirements from new and future experiments is given. Some considerations about the software organization necessary to keep simultaneously distinct physics initializations for TAUOLA are also included
Deep learning approach to the Higgs boson CP measurement in H to tau tau decay and associated systematics
The H to tau tau decays form the prime channel for the measurement of the
Higgs boson state and tests of the CP invariance of Higgs boson couplings. A
previous study has shown the viability of deep learning techniques for the
measurement. In this paper, the study is expanded. Effects due to the partial
modelling of experimental effects are discussed. Furthermore, systematics due
to ? decay modelling for complex cascade decays to tau^pm to a_1^pm nu_tau to
rho^0 pi^pm nu_tau to 3pi^\pm nu_tau are also addressed. Various
parameterisations are considered using low-energy collision data.Comment: 13 pages, 4 figure
Ascertaining the spin for new resonances decaying into tau+ tau- at Hadron Colliders
Evidence of a new particle with mass ~125 GeV decaying into a pair of tau
leptons at the Large Hadron Collider spurs interest in ascertaining its spin in
this channel. Here we present a comparative study between spin-0 and spin-2
nature of this new particle, using spin correlations and decay product
directions. The TauSpinner algorithm is used to re-weight distributions from
qqbar -> gamma/Z -> tau+ tau- sample to simulate a spin-2 state exchange. The
method is based on supplementing the Standard Model matrix elements with those
arising from presence of a new interaction. Studies with simulated samples
demonstrate the discrimination power between these spin hypotheses based on
data collected at the Large Hadron Collider.Comment: 17 pages, 16 encapsulated postscript figure
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