Dispersive evaluation of the second-class amplitude τ→ηπν_τ in the standard model release_bpmucpd43faj3nvbqffzrzaa2q

by S. Descotes-Genon, E. Kou, B. Moussallam

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{'sha1': '68d9e9f28cd2d3ebe8d8808c2e51a933cbe790cf', 'content': 'We reevaluate the two form factors relevant for the $\\eta\\pi$ second-class\n$\\tau$ decay mode, making systematic use of analyticity, unitarity, combined\nwith updated inputs to the NLO chiral constraints. We focus, in particular, on\nthe shape of the $\\rho$ resonance peak which is a background-free signature of\na second-class current. Its dispersive construction requires the\n$\\eta\\pi\\to\\pi\\pi$ scattering amplitude which we derive from a family of\nKhuri-Treiman equations solutions constrained with accurate recent results on\nthe $\\eta\\to3\\pi$ Dalitz plot.', 'mimetype': 'application/x-latex', 'lang': 'en'}
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{'index': 1, 'creator_id': None, 'creator': None, 'raw_name': 'E. Kou', 'given_name': None, 'surname': None, 'role': 'author', 'raw_affiliation': None, 'extra': None}
{'index': 2, 'creator_id': None, 'creator': None, 'raw_name': 'B. Moussallam', 'given_name': None, 'surname': None, 'role': 'author', 'raw_affiliation': None, 'extra': None}
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language en
license_slug ARXIV-1.0
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release_date 2013-03-12
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release_type article
release_year 2013
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title Dispersive evaluation of the second-class amplitude τ→ηπν_τ in the standard model
version v1
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arxiv.base_id 1303.2879
arxiv.categories ['hep-ph']
arxiv.comments Presented at the 12th International workshop on Tau lepton physics (TAU2012) in Nagoya, Japan