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QCD Sum-Rule Calculation of the Kinetic Energy and Chromo-Interaction of Heavy Quarks Inside Mesons
We present a QCD sum-rule determination of the heavy-quark kinetic energy inside a heavy meson, $-\lambda_1/2 m_Q$, which is consistent with the field-theory analog of the virial theorem. We obtain $-\lambda_1\approx (0.10\pm 0.05)~\mbox{GeV}^2$, significantly smaller than a previous sum-rule result...
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Lenguaje: | eng |
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1996
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Acceso en línea: | https://dx.doi.org/10.1016/S0370-2693(96)80016-5 http://cds.cern.ch/record/308140 |
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author | Neubert, M |
author_facet | Neubert, M |
author_sort | Neubert, M |
collection | CERN |
description | We present a QCD sum-rule determination of the heavy-quark kinetic energy inside a heavy meson, $-\lambda_1/2 m_Q$, which is consistent with the field-theory analog of the virial theorem. We obtain $-\lambda_1\approx (0.10\pm 0.05)~\mbox{GeV}^2$, significantly smaller than a previous sum-rule result, but in good agreement with recent determinations from the analysis of inclusive decays. We also present a new determination of the chromo-magnetic interaction, yielding $\lambda_2(m_b)=(0.15\pm 0.03)~\mbox{GeV}^2$. This implies $m_{B^*}^2-m_B^2=(0.60\pm 0.12)~\mbox{GeV}^2$, in good agreement with experiment. As a by-product of our analysis, we derive the QCD sum rules for the three form factors describing the meson matrix element of a velocity-changing current operator containing the gluon field-strength tensor. |
id | cern-308140 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 1996 |
record_format | invenio |
spelling | cern-3081402019-09-30T06:29:59Zdoi:10.1016/S0370-2693(96)80016-5http://cds.cern.ch/record/308140engNeubert, MQCD Sum-Rule Calculation of the Kinetic Energy and Chromo-Interaction of Heavy Quarks Inside MesonsParticle Physics - PhenomenologyWe present a QCD sum-rule determination of the heavy-quark kinetic energy inside a heavy meson, $-\lambda_1/2 m_Q$, which is consistent with the field-theory analog of the virial theorem. We obtain $-\lambda_1\approx (0.10\pm 0.05)~\mbox{GeV}^2$, significantly smaller than a previous sum-rule result, but in good agreement with recent determinations from the analysis of inclusive decays. We also present a new determination of the chromo-magnetic interaction, yielding $\lambda_2(m_b)=(0.15\pm 0.03)~\mbox{GeV}^2$. This implies $m_{B^*}^2-m_B^2=(0.60\pm 0.12)~\mbox{GeV}^2$, in good agreement with experiment. As a by-product of our analysis, we derive the QCD sum rules for the three form factors describing the meson matrix element of a velocity-changing current operator containing the gluon field-strength tensor.hep-ph/9608211CERN-TH-96-208oai:cds.cern.ch:3081401996-08-02 |
spellingShingle | Particle Physics - Phenomenology Neubert, M QCD Sum-Rule Calculation of the Kinetic Energy and Chromo-Interaction of Heavy Quarks Inside Mesons |
title | QCD Sum-Rule Calculation of the Kinetic Energy and Chromo-Interaction of Heavy Quarks Inside Mesons |
title_full | QCD Sum-Rule Calculation of the Kinetic Energy and Chromo-Interaction of Heavy Quarks Inside Mesons |
title_fullStr | QCD Sum-Rule Calculation of the Kinetic Energy and Chromo-Interaction of Heavy Quarks Inside Mesons |
title_full_unstemmed | QCD Sum-Rule Calculation of the Kinetic Energy and Chromo-Interaction of Heavy Quarks Inside Mesons |
title_short | QCD Sum-Rule Calculation of the Kinetic Energy and Chromo-Interaction of Heavy Quarks Inside Mesons |
title_sort | qcd sum-rule calculation of the kinetic energy and chromo-interaction of heavy quarks inside mesons |
topic | Particle Physics - Phenomenology |
url | https://dx.doi.org/10.1016/S0370-2693(96)80016-5 http://cds.cern.ch/record/308140 |
work_keys_str_mv | AT neubertm qcdsumrulecalculationofthekineticenergyandchromointeractionofheavyquarksinsidemesons |