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http://hdl.handle.net/2445/12481
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DC Field | Value | Language |
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dc.contributor.author | Garcia i Tormo, Xavier | cat |
dc.contributor.author | Soto Riera, Joan | cat |
dc.date.accessioned | 2010-05-06T12:09:44Z | - |
dc.date.available | 2010-05-06T12:09:44Z | - |
dc.date.issued | 2004 | cat |
dc.identifier.issn | 0556-2821 | cat |
dc.identifier.uri | http://hdl.handle.net/2445/12481 | - |
dc.description.abstract | We analyze the end-point region of the photon spectrum in semi-inclusive radiative decays of very heavy quarkonium (m alpha_s^2 >> Lambda_QCD). We discuss the interplay of the scales arising in the Soft-Collinear Effective Theory, m, m(1-z)^{1/2} and m(1-z) for z close to 1, with the scales of heavy quarkonium systems in the weak coupling regime, m, m alpha_s and m alpha_s^2. For 1-z \sim alpha_s^2 only collinear and (ultra)soft modes are seen to be relevant, but the recently discovered soft-collinear modes show up for 1-z << alpha_s^2. The S- and P-wave octet shape functions are calculated. When they are included in the analysis of the photon spectrum of the Upsilon (1S) system, the agreement with data in the end-point region becomes excellent. The NRQCD matrix elements <1^3S_1| O_8(^1S_0) | 1^3S_1> and <1^3S_1| O_8(^3P_J) | 1^3S_1> are also obtained. | - |
dc.format.extent | 9 p. | cat |
dc.format.mimetype | application/pdf | eng |
dc.language.iso | eng | eng |
dc.publisher | The American Physical Society | eng |
dc.relation.isformatof | Reproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevD.69.114006 | cat |
dc.relation.ispartof | Physical Review D, 2004, vol. 69, núm. 11, p. 114006-1-114006-9 | cat |
dc.relation.uri | http://dx.doi.org/10.1103/PhysRevD.69.114006 | - |
dc.rights | (c) The American Physical Society, 2004 | eng |
dc.source | Articles publicats en revistes (Física Quàntica i Astrofísica) | - |
dc.subject.classification | Fenomenologia (Física) | ca |
dc.subject.classification | Partícules (Física nuclear) | cat |
dc.subject.classification | Pertorbació (Dinàmica quàntica) | cat |
dc.subject.classification | Desintegració radioactiva | cat |
dc.subject.other | Phenomenological theory (Physics) | eng |
dc.subject.other | Particles (Nuclear physics) | eng |
dc.subject.other | Perturbation (Quantum dynamics) | eng |
dc.subject.other | Radioactive decay | eng |
dc.title | Soft, collinear and nonrelativistic modes in radiative decays of very heavy quarkonium | eng |
dc.type | info:eu-repo/semantics/article | eng |
dc.type | info:eu-repo/semantics/publishedVersion | - |
dc.identifier.idgrec | 536328 | cat |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | - |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
Files in This Item:
File | Description | Size | Format | |
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536328.pdf | 146.29 kB | Adobe PDF | View/Open |
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