Bremsstrahlung simulation in K to pi l^pm nu_l (gamma) decays

Abstract

In physics simulation chains, the PHOTOS Monte Carlo program is often used to simulate QED effects in decays of intermediate particles and resonances. The program is based on an exact multiphoton phase space. In general, the matrix element is obtained from iterations of a universal kernel and approximations are involved. To evaluate the program precision, it is necessary to formulate and implement within the generator the exact matrix element, which depends on the decay channel. Then, all terms necessary for non-leading logarithms are taken into account. In the present letter we focus on the decay K to pi l^pm nu_l and tests of the PHOTOS Monte Carlo program. We conclude a 0.2% relative precision in the implementation of the hard photon matrix element into the emission kernel, including the case where approximations are used.

1+20 pages, 8 figures

References in corpus (9)

• Quest for precision in hadronic cross sections at low energy: Monte Carlo tools vs. experimental data
• An evaluation of |Vus| and precise tests of the Standard Model from world data on leptonic and semileptonic kaon decays
• Universal Interface of TAUOLA Technical and Physics Documentation
• Electromagnetic effects in Kl3 decays
• Scalar QED, NLO and PHOTOS Monte Carlo
• MC-TESTER: a universal tool for comparisons of Monte Carlo predictions for particle decays in high energy physics
• PHOTOS Interface in C++; Technical and Physics Documentation
• Measurements of Charged Kaon Semileptonic Decay Branching Fractions K^+- -> pi^0 mu^+- nu and K+- -> pi^0 e^+- nu and Their Ratio
• Radiative corrections in $K_{e4}$ decay

Cited by in corpus (3)

• QED Bremsstrahlung in decays of electroweak bosons
• Radiative corrections of $O(\alpha )$ to $B^{-}\to V^0{\ell }^{-}{\bar{\nu }}_{\ell }$ decays
• Status of TAUOLA and related projects