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http://hdl.handle.net/2445/140438
Title: | Mass of the ηb and αs from the Nonrelativistic Renormalization Group |
Author: | Kniehl, Bernd A. Penin, Alexander A. Pineda, Antonio (Pineda Ruiz) Smirnov, Vladimir A. Steinhauser, Matthias |
Keywords: | Física de partícules Quarks Particle physics Quarks |
Issue Date: | 15-Jun-2004 |
Publisher: | American Physical Society |
Abstract: | We sum up the next-to-leading logarithmic corrections to the heavy-quarkonium hyperfine splitting, using the nonrelativistic renormalization group. On the basis of this result, we predict the mass of the η b meson to be M ( η b ) = 9421 ± 11 ( th ) + 9 − 8 ( δ α s ) MeV . The experimental measurement of M ( η b ) with a few MeV error would be sufficient to determine α s ( M Z ) with an accuracy of ± 0.003 . For the hyperfine splitting in charmonium, the use of the nonrelativistic renormalization group brings the perturbative prediction significantly closer to the experimental figure. |
Note: | Reproducció del document publicat a: https://doi.org/10.1103/PhysRevLett.92.242001 |
It is part of: | Physical Review Letters, 2004, vol. 92, num. 24, p. 242001 |
URI: | http://hdl.handle.net/2445/140438 |
Related resource: | https://doi.org/10.1103/PhysRevLett.92.242001 |
ISSN: | 0031-9007 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
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