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000292120 005__ 20211110132738.0
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000292120 088__ $$2arXiv$$aarXiv:1402.2787
000292120 1001_ $$0P:(DE-HGF)0$$aKörner, J. G.$$b0$$eCorresponding author
000292120 1112_ $$aHelmholtz International School on Physics of Heavy Quarks and Hadrons$$cDubna$$d2013-07-15 - 2013-07-28$$gHQ2013$$wRussia
000292120 245__ $$aHelicity Amplitudes and Angular Decay Distributions
000292120 260__ $$aHamburg$$bDeutsches Elektronen-Synchrotron, DESY$$c2014
000292120 300__ $$a169-184
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000292120 520__ $$aI discuss how to obtain angular decay distributions for sequentialcascade decays using helicity methods. The angular decay distributionsfollow from a reasonably simple master formula involving bilinearforms of helicity amplitudes and Wigner's $d$ functions. I discussin some detail the issue of gauge invariance for off-shell gauge bosons.As a technical exercise I calculate the linear relation between thehelicity amplitudes and the invariant amplitudes of semileptonic andrare baryon decays. I discuss two explicit examples of angular decaydistributions for (i) the decay $t\to b+W^+(\to \ell^+\nu_\ell)$ (whichleads to the notion of the helicity fractions of the $W^+$), and (ii)the sequential decay $\Lambda_b\to\Lambda(\to p\pi^-)+J/\psi(\to \ell^+\ell^-)$.T = Helicity Amplitudes and Angular Decay Distributions
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000292120 650_7 $$2INSPIRE$$ahelicity: amplitude analysis
000292120 650_7 $$2INSPIRE$$abaryon: decay
000292120 650_7 $$2INSPIRE$$agauge boson: off-shell
000292120 650_7 $$2INSPIRE$$ainvariance: gauge
000292120 650_7 $$2INSPIRE$$acascade decay
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000292120 773__ $$a10.3204/DESY-PROC-2013-03/Koerner
000292120 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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