HQET sum rules for matrix elements of dimension-six four-quark operators for meson lifetimes within and beyond the Standard Model
Abstract Theory predictions of heavy-hadron lifetime ratios critically depend on precise determinations of the dimension-six spectator effects arising from the double insertion of the weak effective |∆B| = 1 Hamiltonian. In the presence of beyond-standard-model (BSM) operators, the resulting ∆B = 0...
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| Format: | Article |
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SpringerOpen
2025-04-01
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| Series: | Journal of High Energy Physics |
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| Online Access: | https://doi.org/10.1007/JHEP04(2025)081 |
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| author | Matthew Black Martin Lang Alexander Lenz Zachary Wüthrich |
| author_facet | Matthew Black Martin Lang Alexander Lenz Zachary Wüthrich |
| author_sort | Matthew Black |
| collection | DOAJ |
| description | Abstract Theory predictions of heavy-hadron lifetime ratios critically depend on precise determinations of the dimension-six spectator effects arising from the double insertion of the weak effective |∆B| = 1 Hamiltonian. In the presence of beyond-standard-model (BSM) operators, the resulting ∆B = 0 Hamiltonian features additional four-quark operators whose matrix elements need to be determined using non-perturbative methods. We present for the first time results for the non-perturbative hadronic matrix elements of the four-quark operators relevant for the description of the meson lifetime ratio τ (B +) /τ (B d ), obtained using heavy-quark effective theory (HQET) sum rules with the full BSM effective Hamiltonian. In addition, we recompute and update the bag parameters for the Standard Model operators. |
| format | Article |
| id | doaj-art-95501f5e7b89498ca9e1784516bc8f1b |
| institution | Kabale University |
| issn | 1029-8479 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj-art-95501f5e7b89498ca9e1784516bc8f1b2025-08-20T03:53:22ZengSpringerOpenJournal of High Energy Physics1029-84792025-04-012025413310.1007/JHEP04(2025)081HQET sum rules for matrix elements of dimension-six four-quark operators for meson lifetimes within and beyond the Standard ModelMatthew Black0Martin Lang1Alexander Lenz2Zachary Wüthrich3Theoretische Teilchenphysik, Center for Particle Physics Siegen, Physik Department, Universität SiegenTheoretische Teilchenphysik, Center for Particle Physics Siegen, Physik Department, Universität SiegenTheoretische Teilchenphysik, Center for Particle Physics Siegen, Physik Department, Universität SiegenTheoretische Teilchenphysik, Center for Particle Physics Siegen, Physik Department, Universität SiegenAbstract Theory predictions of heavy-hadron lifetime ratios critically depend on precise determinations of the dimension-six spectator effects arising from the double insertion of the weak effective |∆B| = 1 Hamiltonian. In the presence of beyond-standard-model (BSM) operators, the resulting ∆B = 0 Hamiltonian features additional four-quark operators whose matrix elements need to be determined using non-perturbative methods. We present for the first time results for the non-perturbative hadronic matrix elements of the four-quark operators relevant for the description of the meson lifetime ratio τ (B +) /τ (B d ), obtained using heavy-quark effective theory (HQET) sum rules with the full BSM effective Hamiltonian. In addition, we recompute and update the bag parameters for the Standard Model operators.https://doi.org/10.1007/JHEP04(2025)081Hadronic Matrix Elements and Weak DecaysOther Weak Scale BSM ModelsBottom Quarks |
| spellingShingle | Matthew Black Martin Lang Alexander Lenz Zachary Wüthrich HQET sum rules for matrix elements of dimension-six four-quark operators for meson lifetimes within and beyond the Standard Model Journal of High Energy Physics Hadronic Matrix Elements and Weak Decays Other Weak Scale BSM Models Bottom Quarks |
| title | HQET sum rules for matrix elements of dimension-six four-quark operators for meson lifetimes within and beyond the Standard Model |
| title_full | HQET sum rules for matrix elements of dimension-six four-quark operators for meson lifetimes within and beyond the Standard Model |
| title_fullStr | HQET sum rules for matrix elements of dimension-six four-quark operators for meson lifetimes within and beyond the Standard Model |
| title_full_unstemmed | HQET sum rules for matrix elements of dimension-six four-quark operators for meson lifetimes within and beyond the Standard Model |
| title_short | HQET sum rules for matrix elements of dimension-six four-quark operators for meson lifetimes within and beyond the Standard Model |
| title_sort | hqet sum rules for matrix elements of dimension six four quark operators for meson lifetimes within and beyond the standard model |
| topic | Hadronic Matrix Elements and Weak Decays Other Weak Scale BSM Models Bottom Quarks |
| url | https://doi.org/10.1007/JHEP04(2025)081 |
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