We briefly review how precise determinations of the strong coupling constant and of the heavy quark masses may be obtained from heavy quarkonium. Such determinations are competitive with heavy quark masses extraction from other systems and give an accurate value for the strong coupling constant at a relatively low energy scale. In particular we report about a recent determination of $\als$ from $\Gamma(\Upsilon(1S) \to \gamma X)/\Gamma(\Upsilon(1S) \to X)$ with CLEO data which includes color octet contributions and avoids model dependence in the extraction. The obtained value is $\als (M_{\Upsilon(1S)})= 0.184^{+0.015}_{-0.014}$, which corresponds to $\als(M_Z) = 0.119^{+0.006}_{-0.005}$. Future prospects for more precise extractions of the heavy quark masses and $\als$ are discussed.

Extraction of alpha(s) and m(Q) from Onia / N. Brambilla - In: Proceedings of the international workshop on charm physics : charm 2007, Cornell University, Ithaca, New York, 5-8 August 2007 / [a cura di] H. Mahlke, J. Napolitano. - [Ithaca, N.Y.] : [Cornell University], 2007. - pp. 113-121 (( convegno International Workshop on Charm Physics tenutosi a Ithaca, N.Y., USA nel 2007.

Extraction of alpha(s) and m(Q) from Onia

N. Brambilla
Primo
2007

Abstract

We briefly review how precise determinations of the strong coupling constant and of the heavy quark masses may be obtained from heavy quarkonium. Such determinations are competitive with heavy quark masses extraction from other systems and give an accurate value for the strong coupling constant at a relatively low energy scale. In particular we report about a recent determination of $\als$ from $\Gamma(\Upsilon(1S) \to \gamma X)/\Gamma(\Upsilon(1S) \to X)$ with CLEO data which includes color octet contributions and avoids model dependence in the extraction. The obtained value is $\als (M_{\Upsilon(1S)})= 0.184^{+0.015}_{-0.014}$, which corresponds to $\als(M_Z) = 0.119^{+0.006}_{-0.005}$. Future prospects for more precise extractions of the heavy quark masses and $\als$ are discussed.
English
Standard model of particle physics ; QCD
Settore FIS/02 - Fisica Teorica, Modelli e Metodi Matematici
Intervento a convegno
Proceedings of the international workshop on charm physics : charm 2007, Cornell University, Ithaca, New York, 5-8 August 2007
H. Mahlke, J. Napolitano
[Ithaca, N.Y.]
[Cornell University]
2007
113
121
null
International Workshop on Charm Physics
Ithaca, N.Y., USA
2007
Convegno internazionale
Intervento richiesto
http://www.slac.stanford.edu/econf/C070805
N. Brambilla
Book Part (author)
none
273
Extraction of alpha(s) and m(Q) from Onia / N. Brambilla - In: Proceedings of the international workshop on charm physics : charm 2007, Cornell University, Ithaca, New York, 5-8 August 2007 / [a cura di] H. Mahlke, J. Napolitano. - [Ithaca, N.Y.] : [Cornell University], 2007. - pp. 113-121 (( convegno International Workshop on Charm Physics tenutosi a Ithaca, N.Y., USA nel 2007.
info:eu-repo/semantics/conferenceObject
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/40467
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