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000292108 1001_ $$aFajfer, Svjetlana$$b0
000292108 1112_ $$aHelmholtz International School on Physics of Heavy Quarks and Hadrons$$cDubna$$d2013-07-15 - 2013-07-28$$gHQ2013$$wRussia
000292108 245__ $$aLectures on new physics searches in $B\to D^{(*)}\tau\nu_\tau$
000292108 260__ $$aHamburg$$bDeutsches Elektronen-Synchrotron, DESY$$c2014
000292108 300__ $$a32-51
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000292108 520__ $$aThe Standard model's predictions for the rates for $B\to D^{*} \tau\nu_\tau$ and $B\to D\tau\nu_\tau$ differ from the experimental results.The difference might be accounted by the presence of new physics.The understanding of the non-perturbative QCD dynamics in the mesontransitions is crucial in order to refine the searches for new physicseffects. We give short introduction to heavy quark effective theory(HQET) and then investigate the most general set of lowest dimensionaleffective operators leading to helicity suppressed modifications of$b\to c$ (semi)leptonic transitions. The contributions of these operatorsto $B\to D^{(*)} \tau \nu_\tau$ decay amplitudes can be found by determiningthe differential decay rate, longitudinal $D^*$ polarization fraction,$D^*- \tau$ opening angle asymmetry and the $\tau$ helicity asymmetry.We identify the size of possible new physics contributions constrainedby the present $ B\to D^{(*)} \tau \nu_\tau$ rate measurements andfind significant modifications are still possible in all these observables.Then we discuss few models of new physics scenarios which can contributein both decay modes.T = Lectures on new physics searches in $B\to D^{(*)}\tau\nu_\tau$
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000292108 650_7 $$2INSPIRE$$anew physics
000292108 650_7 $$2INSPIRE$$alectures
000292108 650_7 $$2INSPIRE$$aB: semileptonic decay
000292108 650_7 $$2INSPIRE$$aB: branching ratio
000292108 650_7 $$2INSPIRE$$adecay: flavor changing
000292108 650_7 $$2INSPIRE$$aneutral current: flavor changing
000292108 650_7 $$2INSPIRE$$aquark: flavor: violation
000292108 650_7 $$2INSPIRE$$aHeavy Quark Effective Theory
000292108 650_7 $$2INSPIRE$$aquantum chromodynamics: nonperturbative
000292108 650_7 $$2INSPIRE$$atau: helicity
000292108 650_7 $$2INSPIRE$$ahelicity: asymmetry
000292108 650_7 $$2INSPIRE$$aB --> D tau antineutrino/tau
000292108 650_7 $$2INSPIRE$$aB --> D*(2010) tau antineutrino/tau
000292108 693__ $$0EXP:(DE-H253)HERA(machine)-20150101$$1EXP:(DE-588)4159571-3$$5EXP:(DE-H253)HERA(machine)-20150101$$aHERA$$eFacility (machine) HERA$$x0
000292108 7001_ $$aNisandzic, Ivan$$b1
000292108 773__ $$a10.3204/DESY-PROC-2013-03/Fajfer
000292108 7870_ $$0PUBDB-2015-05817$$aAli, Ahmed et.al.$$dDeutsches Elektronen-Synchrotron, DESY, Hamburg, 2014$$iIsPartOf$$rDESY-PROC-2013-03$$tProceedings, Helmholtz International School on Physics of Heavy Quarks and Hadrons (HQ2013)
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