Bottom Quark Mass from Upsilon Mesons
| dc.creator | Hoang, A. H. | |
| dc.date | 1998-03-26 | |
| dc.date.accessioned | 2026-07-07T10:33:39Z | |
| dc.date.available | 2026-07-07T10:33:39Z | |
| dc.description | The bottom quark pole mass $M_b$ is determined using a sum rule which relates the masses and the electronic decay widths of the $Υ$ mesons to large $n$ moments of the vacuum polarization function calculated from nonrelativistic quantum chromodynamics. The complete set of next-to-next-to-leading order (i.e. ${\cal{O}}(α_s^2, α_s v, v^2)$ where $v$ is the bottom quark c.m. velocity) corrections is calculated and leads to a considerable reduction of theoretical uncertainties compared to a pure next-to-leading order analysis. However, the theoretical uncertainties remain much larger than the experimental ones. For a two parameter fit for $M_b$, and the strong $\bar{MS}$ coupling $α_s$, and using the scanning method to estimate theoretical uncertainties, the next-to-next-to-leading order analysis yields 4.74 GeV $\le M_b\le 4.87$ GeV and $0.096 \le α_s(M_z) \le 0.124$ if experimental uncertainties are included at the 95% confidence level and if two-loop running for $α_s$ is employed. $M_b$ and $α_s$ have a sizeable positive correlation. For the running $\bar{MS}$ bottom quark mass this leads to 4.09 GeV $\le m_b(M_{Υ(1S)}/2)\le 4.32$ GeV. If $α_s$ is taken as an input, the result for the bottom quark pole mass reads 4.78 GeV $\le M_b\le 4.98$ GeV (4.08 GeV $\le m_b(M_{Υ(1S)}/2)\le 4.28$ GeV) for $0.114\lsim α_s(M_z)\le 0.122$. The discrepancies between the results of three previous analyses on the same subject by Voloshin, Jamin and Pich, and Kühn et al. are clarified. A comprehensive review on the calculation of the heavy quark-antiquark pair production cross section through a vector current at next-to-next-to leading order in the nonrelativistic expansion is presented. | |
| dc.description | 55 pages, latex, 13 postscript figures included | |
| dc.identifier | https://arxiv.org/abs/hep-ph/9803454 | |
| dc.identifier | http://arxiv.org/abs/hep-ph/9803454 | |
| dc.identifier | Phys.Rev.D59:014039,1999 | |
| dc.identifier | doi:10.1103/PhysRevD.59.014039 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/179189 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.subject | High Energy Physics - Experiment | |
| dc.title | Bottom Quark Mass from Upsilon Mesons | |
| dc.type | text |