Please use this identifier to cite or link to this item:
http://hdl.handle.net/2445/12481
Title: | Soft, collinear and nonrelativistic modes in radiative decays of very heavy quarkonium |
Author: | Garcia i Tormo, Xavier Soto Riera, Joan |
Keywords: | Fenomenologia (Física) Partícules (Física nuclear) Pertorbació (Dinàmica quàntica) Desintegració radioactiva Phenomenological theory (Physics) Particles (Nuclear physics) Perturbation (Quantum dynamics) Radioactive decay |
Issue Date: | 2004 |
Publisher: | The American Physical Society |
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. |
Note: | Reproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevD.69.114006 |
It is part of: | Physical Review D, 2004, vol. 69, núm. 11, p. 114006-1-114006-9 |
URI: | http://hdl.handle.net/2445/12481 |
Related resource: | http://dx.doi.org/10.1103/PhysRevD.69.114006 |
ISSN: | 0556-2821 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
536328.pdf | 146.29 kB | Adobe PDF | View/Open |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.