Leptonic widths of heavy quarkonia:: S-wave QCD/NRQCD matching coefficients for the electromagnetic vector annihilation current at O(αsv2)
- Publication type:
- Journal article
- Metadata:
-
- Autoren
- A Hart
- GM von Hippel
- RR Horgan
- Autoren-URL
- https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=fis-test-1&SrcAuth=WosAPI&KeyUT=WOS:000243896200038&DestLinkType=FullRecord&DestApp=WOS_CPL
- DOI
- 10.1103/PhysRevD.75.014008
- eISSN
- 1550-2368
- Externe Identifier
- Clarivate Analytics Document Solution ID: 131UP
- ISSN
- 1550-7998
- Ausgabe der Veröffentlichung
- 1
- Zeitschrift
- PHYSICAL REVIEW D
- Artikelnummer
- ARTN 014008
- Datum der Veröffentlichung
- 2007
- Status
- Published
- Titel
- Leptonic widths of heavy quarkonia:: S-wave QCD/NRQCD matching coefficients for the electromagnetic vector annihilation current at <i>O</i>(<i>α<sub>s</sub>v</i><SUP>2</SUP>)
- Sub types
- Article
- Ausgabe der Zeitschrift
- 75
Data source: Web of Science (Lite)
- Other metadata sources:
-
- Autoren
- A Hart
- GM von Hippel
- RR Horgan
- DOI
- 10.1103/physrevd.75.014008
- eISSN
- 1550-2368
- ISSN
- 1550-7998
- Ausgabe der Veröffentlichung
- 1
- Zeitschrift
- Physical Review D
- Sprache
- en
- Artikelnummer
- 014008
- Online publication date
- 2007
- Status
- Published online
- Herausgeber
- American Physical Society (APS)
- Herausgeber URL
- http://dx.doi.org/10.1103/physrevd.75.014008
- Datum der Datenerfassung
- 2017
- Titel
- Leptonic widths of heavy quarkonia:<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>S</mml:mi></mml:math>-wave QCD/NRQCD matching coefficients for the electromagnetic vector annihilation current at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="script">O</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:msub><mml:mi>α</mml:mi><mml:mi>s</mml:mi></mml:msub><mml:msup><mml:mi>v</mml:mi><mml:mn>2</mml:mn></mml:msup><mml:mo stretchy="false">)</mml:mo></mml:math>
- Ausgabe der Zeitschrift
- 75
Data source: Crossref
- Abstract
- We construct the S-wave part of the electromagnetic vector annihilation current to O(alpha_s v^2)$ on the lattice for heavy quarks whose dynamics are described by the NRQCD action, where v is the non-relativistic quark velocity. The lattice vector current for QQbar annihilation is expressed as a linear combination of lattice operators with quantum numbers L=0, J^P=1^-, and the coefficients are determined by matching this lattice current to the corresponding continuum current in QCD to O(v^2) to one-loop. The annihilation channel gives a complex amplitude and a proper choice for the contours of integration is needed; a simple Wick rotation is not possible. In this way, and with a careful choice of subtraction functions in the numerical integration, the Coulomb-exchange and infrared singularities appearing in the amplitudes are successfully treated. The matching coefficients are given as a function of the heavy quark mass Ma in lattice units. An automated vertex generation program written in Python is employed, allowing us to use a realistic NRQCD action and an improved gluon lattice action. A change in the definition of either action is easily accommodated in this procedure. The final result is applicable to the electromagnetic decays of heavy quarkonia, notably the Upsilon meson.
- Autoren
- A Hart
- GM von Hippel
- RR Horgan
- Autoren-URL
- http://arxiv.org/abs/hep-lat/0605007v2
- Zeitschrift
- Phys.Rev.D
- Schlüsselwörter
- hep-lat
- hep-lat
- Notes
- Corrections to section VA
- Paginierung
- 014008
- Datum der Veröffentlichung
- 2006
- Herausgeber URL
- http://dx.doi.org/10.1103/PhysRevD.75.014008
- Datum der Datenerfassung
- 2006
- Datum, an dem der Datensatz öffentlich gemacht wurde
- 2006
- Titel
- Leptonic widths of heavy quarkonia: S-Wave QCD/NRQCD matching coefficients for the electromagnetic vector annihilation current at O(alpha_s v^2)
- Ausgabe der Zeitschrift
- 75
Files
0605007v2.pdf
Data source: arXiv
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