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200	1		_aAnalysis of the nonleptonic two-body decays of the Λ hyperon _fM. A. Ivanov, J. G. Korner, V. E. Lyubovitskiy (Lyubovitskij), Zh. Tyulemisov
203			_aText _celectronic
300			_aTitle screen
320			_a[References: 70 tit.]
330			_aWe systematically study two-body nonleptonic decays of light lambda hyperon Λ→pπ−(nπ0) with account for both short- and long-distance effects. The short-distance effects are induced by five topologies of external and internal weak W± exchange, while long-distance effects are saturated by an inclusion of the so-called pole diagrams with intermediate 12+ and 12− baryon resonances. The contributions from 12+ resonances are calculated straightforwardly by account for nucleon and Σ baryons whereas the contributions from 12− resonances are calculated by using the well-known soft-pion theorem in the current-algebra approach. It allows one to express the parity-violating S-wave amplitude in terms of parity-conserving matrix elements. From our previous analysis of heavy baryons we know that short-distance effects induced by internal topologies are not suppressed in comparison with external W-exchange diagram and must be included for description of data. Here, in the case of Λ decays we found that the contribution of external and internal W-exchange diagrams is sizably suppressed, e.g., by one order of magnitude in comparison with data, which are known with quite good accuracy. Pole diagrams play the major role to get consistency with experiment.
333			_aРежим доступа: по договору с организацией-держателем ресурса
461			_tPhysical Review D _ocovering particles, fields, gravitation, and cosmology
463			_tVol. 104, iss. 7 _v[074004, 10 p.] _d2021
610	1		_aэлектронный ресурс
610	1		_aтруды учёных ТПУ
701		1	_aIvanov _bM. A. _gMikhail Alekseevich
701		1	_aKorner _bJ. G. _gJuergen
701		1	_aLyubovitskiy (Lyubovitskij) _bV. E. _cphysicist _cProfessor of Tomsk Polytechnic University, Doctor of physical and mathematical sciences, Professor of the University of Tubingen (Germany) _f1963- _gValery Efimovich _2stltpush _3(RuTPU)RU\TPU\pers\33385
701		1	_aTyulemisov _bZh. _gZhomart
712	0	2	_aНациональный исследовательский Томский политехнический университет _bШкола базовой инженерной подготовки _bОтделение математики и информатики _h8031 _2stltpush _3(RuTPU)RU\TPU\col\23555
801		2	_aRU _b63413507 _c20220530 _gRCR
856	4		_uhttps://doi.org/10.1103/PhysRevD.104.074004
942			_cCF