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Four quark operators and nonleptonic weak transitions
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Four quark operators and nonleptonic weak transitions
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| dc.contributor.author | Pich Zardoya, Antonio | |
| dc.contributor.author | Rafael, Eduardo de | |
| dc.date.accessioned | 2015-02-25T12:07:17Z | |
| dc.date.available | 2015-02-25T12:07:17Z | |
| dc.date.issued | 1991 | |
| dc.identifier.citation | Pich Zardoya, Antonio Rafael, Eduardo de 1991 Four quark operators and nonleptonic weak transitions Nuclear Physics B 358 2 311 382 | |
| dc.identifier.uri | http://hdl.handle.net/10550/42276 | |
| dc.description.abstract | Matrix elements of four-quark operators are studied with two approaches. First inclusively; we consider two-point functions of four-quark operators. We compute their corresponding spectral functions at very short distances using perturbative QCD with inclusion of O(alpha-s) corrections; and at very long distances, using the chiral effective realization of QCD in terms of Goldstone particles. A qualitative picture emerges which requires, for consistency between the two extreme behaviours, a large coupling constant for DELTA-I = 1/2 transitions. The other, more direct approach, consists of calculating the effective action of four-quark operators by integrating out the quark fields in a gluonic background and in the presence of a source term which triggers spontaneous chiral symmetry breaking. The procedure follows the method elaborated recently in ref [1]. This way we compute the coupling constants of the lowest-order effective chiral lagrangian with DELTA-S = 1 (DELTA-I = 1/2 and 3/2) and DELTA-S = 2 (the so called B-factor.) The calculations include the well-known O(N(c)2) contributions as well as the subleading O(N(c)) with inclusion of the O(alpha-s(N)c) terms. The picture which emerges at this approximation is already very encouraging. Comparison with other approaches is also made. | |
| dc.language.iso | eng | |
| dc.relation.ispartof | Nuclear Physics B, 1991, vol. 358, num. 2, p. 311-382 | |
| dc.subject | Física | |
| dc.title | Four quark operators and nonleptonic weak transitions | |
| dc.type | journal article | es_ES |
| dc.date.updated | 2015-02-25T12:07:17Z | |
| dc.identifier.doi | 10.1016/0550-3213(91)90351-W | |
| dc.identifier.idgrec | 081654 | |
| dc.rights.accessRights | open access | es_ES |
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