Spectroscopy of $$\mathbf {B_c}$$ Bc mesons and the possibility of finding exotic $$\mathbf {B_c}$$ Bc -like structures
Abstract The bottom-charmed ($$B_c$$ Bc ) mesons are more stable than their charmonium ($$c{{\bar{c}}}$$ cc¯ ) and bottomium ($$b{{\bar{b}}}$$ bb¯ ) partners because they cannot annihilate into gluons. However, the low production cross-sections and signal-to-background ratios avoided until now their...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2020-03-01
|
| Series: | European Physical Journal C: Particles and Fields |
| Online Access: | http://link.springer.com/article/10.1140/epjc/s10052-020-7764-6 |
| _version_ | 1818279836844556288 |
|---|---|
| author | Pablo G. Ortega Jorge Segovia David R. Entem Francisco Fernández |
| author_facet | Pablo G. Ortega Jorge Segovia David R. Entem Francisco Fernández |
| author_sort | Pablo G. Ortega |
| collection | DOAJ |
| description | Abstract The bottom-charmed ($$B_c$$ Bc ) mesons are more stable than their charmonium ($$c{{\bar{c}}}$$ cc¯ ) and bottomium ($$b{{\bar{b}}}$$ bb¯ ) partners because they cannot annihilate into gluons. However, the low production cross-sections and signal-to-background ratios avoided until now their clear identification. The recent experimental results reported by CMS and LHCb at CERN open the possibility of having a $$B_c$$ Bc spectrum as complete as the ones of charmonium and bottomonium. Motivated by this expectation, we compute bottom-charmed meson masses in the region energies in which decay meson–meson thresholds are opened, looking for the analogs to the X(3872) in the $$B_c$$ Bc spectroscopy. We use a constituent quark model in which quark–antiquark degrees of freedom are complemented by four-body Fock states configurations. The model has been applied to a wide range of hadronic observables, in particular to the X(3872), and thus the model parameters are completely constrained. No extra states are found in the $$J^P=0^+$$ JP=0+ and $$J^P=1^+$$ JP=1+ sectors. However, in the $$J^P=2^+$$ JP=2+ sector we found an additional state very close to the $$D^*B^*$$ D∗B∗ threshold which could be experimentally detected. |
| first_indexed | 2024-12-12T23:39:40Z |
| format | Article |
| id | doaj.art-35db8176f2ee44059d62af88c7454093 |
| institution | Directory Open Access Journal |
| issn | 1434-6044 1434-6052 |
| language | English |
| last_indexed | 2024-12-12T23:39:40Z |
| publishDate | 2020-03-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | European Physical Journal C: Particles and Fields |
| spelling | doaj.art-35db8176f2ee44059d62af88c74540932022-12-22T00:07:14ZengSpringerOpenEuropean Physical Journal C: Particles and Fields1434-60441434-60522020-03-018031810.1140/epjc/s10052-020-7764-6Spectroscopy of $$\mathbf {B_c}$$ Bc mesons and the possibility of finding exotic $$\mathbf {B_c}$$ Bc -like structuresPablo G. Ortega0Jorge Segovia1David R. Entem2Francisco Fernández3Grupo de Física Nuclear and Instituto Universitario de Física Fundamental y Matemáticas (IUFFyM), Universidad de SalamancaDepartamento de Sistemas Físicos, Químicos y Naturales, Universidad Pablo de OlavideGrupo de Física Nuclear and Instituto Universitario de Física Fundamental y Matemáticas (IUFFyM), Universidad de SalamancaGrupo de Física Nuclear and Instituto Universitario de Física Fundamental y Matemáticas (IUFFyM), Universidad de SalamancaAbstract The bottom-charmed ($$B_c$$ Bc ) mesons are more stable than their charmonium ($$c{{\bar{c}}}$$ cc¯ ) and bottomium ($$b{{\bar{b}}}$$ bb¯ ) partners because they cannot annihilate into gluons. However, the low production cross-sections and signal-to-background ratios avoided until now their clear identification. The recent experimental results reported by CMS and LHCb at CERN open the possibility of having a $$B_c$$ Bc spectrum as complete as the ones of charmonium and bottomonium. Motivated by this expectation, we compute bottom-charmed meson masses in the region energies in which decay meson–meson thresholds are opened, looking for the analogs to the X(3872) in the $$B_c$$ Bc spectroscopy. We use a constituent quark model in which quark–antiquark degrees of freedom are complemented by four-body Fock states configurations. The model has been applied to a wide range of hadronic observables, in particular to the X(3872), and thus the model parameters are completely constrained. No extra states are found in the $$J^P=0^+$$ JP=0+ and $$J^P=1^+$$ JP=1+ sectors. However, in the $$J^P=2^+$$ JP=2+ sector we found an additional state very close to the $$D^*B^*$$ D∗B∗ threshold which could be experimentally detected.http://link.springer.com/article/10.1140/epjc/s10052-020-7764-6 |
| spellingShingle | Pablo G. Ortega Jorge Segovia David R. Entem Francisco Fernández Spectroscopy of $$\mathbf {B_c}$$ Bc mesons and the possibility of finding exotic $$\mathbf {B_c}$$ Bc -like structures European Physical Journal C: Particles and Fields |
| title | Spectroscopy of $$\mathbf {B_c}$$ Bc mesons and the possibility of finding exotic $$\mathbf {B_c}$$ Bc -like structures |
| title_full | Spectroscopy of $$\mathbf {B_c}$$ Bc mesons and the possibility of finding exotic $$\mathbf {B_c}$$ Bc -like structures |
| title_fullStr | Spectroscopy of $$\mathbf {B_c}$$ Bc mesons and the possibility of finding exotic $$\mathbf {B_c}$$ Bc -like structures |
| title_full_unstemmed | Spectroscopy of $$\mathbf {B_c}$$ Bc mesons and the possibility of finding exotic $$\mathbf {B_c}$$ Bc -like structures |
| title_short | Spectroscopy of $$\mathbf {B_c}$$ Bc mesons and the possibility of finding exotic $$\mathbf {B_c}$$ Bc -like structures |
| title_sort | spectroscopy of mathbf b c bc mesons and the possibility of finding exotic mathbf b c bc like structures |
| url | http://link.springer.com/article/10.1140/epjc/s10052-020-7764-6 |
| work_keys_str_mv | AT pablogortega spectroscopyofmathbfbcbcmesonsandthepossibilityoffindingexoticmathbfbcbclikestructures AT jorgesegovia spectroscopyofmathbfbcbcmesonsandthepossibilityoffindingexoticmathbfbcbclikestructures AT davidrentem spectroscopyofmathbfbcbcmesonsandthepossibilityoffindingexoticmathbfbcbclikestructures AT franciscofernandez spectroscopyofmathbfbcbcmesonsandthepossibilityoffindingexoticmathbfbcbclikestructures |