Charm sea effects on charmonium decay constants and heavy meson masses
We estimate the effects on the decay constants of charmonium and on heavy meson masses due to the charm quark in the sea. Our goal is to understand whether for these quantities Nf=2+1 lattice QCD simulations provide results that can be compared with experiments or whether Nf=2+1+1 QCD including the...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Springer Berlin Heidelberg
2021
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| Online Access: | https://hdl.handle.net/1721.1/132959 |
| _version_ | 1826196308346535936 |
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| author | Calì, Salvatore Eckert, Kevin Heitger, Jochen Knechtli, Francesco Korzec, Tomasz |
| author2 | Massachusetts Institute of Technology. Center for Theoretical Physics |
| author_facet | Massachusetts Institute of Technology. Center for Theoretical Physics Calì, Salvatore Eckert, Kevin Heitger, Jochen Knechtli, Francesco Korzec, Tomasz |
| author_sort | Calì, Salvatore |
| collection | MIT |
| description | We estimate the effects on the decay constants of charmonium and on heavy meson masses due to the charm quark in the sea. Our goal is to understand whether for these quantities Nf=2+1 lattice QCD simulations provide results that can be compared with experiments or whether Nf=2+1+1 QCD including the charm quark in the sea needs to be simulated. We consider two theories, Nf=0 QCD and QCD with Nf=2 charm quarks in the sea. The charm sea effects (due to two charm quarks) are estimated comparing the results obtained in these two theories, after matching them and taking the continuum limit. The absence of light quarks allows us to simulate the Nf=2 theory at lattice spacings down to 0.023 fm that are crucial for reliable continuum extrapolations. We find that sea charm quark effects are below 1% for the decay constants of charmonium. Our results show that decoupling of charm works well up to energies of about 500 MeV. We also compute the derivatives of the decay constants and meson masses with respect to the charm mass. For these quantities we again do not see a significant dynamical charm quark effect, albeit with a lower precision. For mesons made of a charm quark and a heavy antiquark, whose mass is twice that of the charm quark, sea effects are only about 1‰ in the ratio of vector to pseudoscalar masses. |
| first_indexed | 2024-09-23T10:24:50Z |
| format | Article |
| id | mit-1721.1/132959 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T10:24:50Z |
| publishDate | 2021 |
| publisher | Springer Berlin Heidelberg |
| record_format | dspace |
| spelling | mit-1721.1/1329592024-06-05T20:38:12Z Charm sea effects on charmonium decay constants and heavy meson masses Calì, Salvatore Eckert, Kevin Heitger, Jochen Knechtli, Francesco Korzec, Tomasz Massachusetts Institute of Technology. Center for Theoretical Physics We estimate the effects on the decay constants of charmonium and on heavy meson masses due to the charm quark in the sea. Our goal is to understand whether for these quantities Nf=2+1 lattice QCD simulations provide results that can be compared with experiments or whether Nf=2+1+1 QCD including the charm quark in the sea needs to be simulated. We consider two theories, Nf=0 QCD and QCD with Nf=2 charm quarks in the sea. The charm sea effects (due to two charm quarks) are estimated comparing the results obtained in these two theories, after matching them and taking the continuum limit. The absence of light quarks allows us to simulate the Nf=2 theory at lattice spacings down to 0.023 fm that are crucial for reliable continuum extrapolations. We find that sea charm quark effects are below 1% for the decay constants of charmonium. Our results show that decoupling of charm works well up to energies of about 500 MeV. We also compute the derivatives of the decay constants and meson masses with respect to the charm mass. For these quantities we again do not see a significant dynamical charm quark effect, albeit with a lower precision. For mesons made of a charm quark and a heavy antiquark, whose mass is twice that of the charm quark, sea effects are only about 1‰ in the ratio of vector to pseudoscalar masses. 2021-10-13T18:33:24Z 2021-10-13T18:33:24Z 2021-08 2021-06 2021-10-10T03:11:36Z Article http://purl.org/eprint/type/JournalArticle 1434-6052 https://hdl.handle.net/1721.1/132959 Calì, S., Eckert, K., Heitger, J. et al. Charm sea effects on charmonium decay constants and heavy meson masses. Eur. Phys. J. C 81, 733 (2021) en https://doi.org/10.1140/epjc/s10052-021-09520-y European Physical Journal C Creative Commons Attribution https://creativecommons.org/licenses/by/4.0/ The Author(s) application/pdf Springer Berlin Heidelberg Springer Berlin Heidelberg |
| spellingShingle | Calì, Salvatore Eckert, Kevin Heitger, Jochen Knechtli, Francesco Korzec, Tomasz Charm sea effects on charmonium decay constants and heavy meson masses |
| title | Charm sea effects on charmonium decay constants and heavy meson masses |
| title_full | Charm sea effects on charmonium decay constants and heavy meson masses |
| title_fullStr | Charm sea effects on charmonium decay constants and heavy meson masses |
| title_full_unstemmed | Charm sea effects on charmonium decay constants and heavy meson masses |
| title_short | Charm sea effects on charmonium decay constants and heavy meson masses |
| title_sort | charm sea effects on charmonium decay constants and heavy meson masses |
| url | https://hdl.handle.net/1721.1/132959 |
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