Observation of New Resonances Decaying to J/ψK+ and J/ψϕ
The first observation of exotic states with a new quark content $c \bar{c} u \bar{s}$ decaying to the $J/\psi K^+$ final state is reported with high significance from an amplitude analysis of the $B^+ \to J/\psi \phi K^+$ decay. The analysis is carried out using proton-proton collision data corre...
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| Other Authors: | |
| Format: | Article |
| Language: | English |
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American Physical Society (APS)
2022
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| Online Access: | https://hdl.handle.net/1721.1/142447 |
| _version_ | 1811072304753410048 |
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| author | Williams, Michael |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Williams, Michael |
| author_sort | Williams, Michael |
| collection | MIT |
| description | The first observation of exotic states with a new quark content $c \bar{c} u
\bar{s}$ decaying to the $J/\psi K^+$ final state is reported with high
significance from an amplitude analysis of the $B^+ \to J/\psi \phi K^+$ decay.
The analysis is carried out using proton-proton collision data corresponding to
a total integrated luminosity of 9 fb$^{-1}$ collected by the LHCb experiment
at centre-of-mass energies of 7, 8 and 13 TeV. The most significant state,
$Z_{cs}(4000)^+$, has a mass of $4003\pm6\,^{+\,\phantom{0}4}_{-\,14}$ MeV, a
width of $131\pm15\pm26$ MeV, and spin-parity $J^P=1^+$, where the quoted
uncertainties are statistical and systematic, respectively. A new $1^+$
$X(4685)$ state decaying to the $J/\psi \phi$ final state is also observed with
high significance. In addition, the four previously reported $J/\psi \phi$
states are confirmed and two more exotic states, $Z_{cs}(4220)^+$ and
$X(4630)$, are observed with significance exceeding five standard deviations. |
| first_indexed | 2024-09-23T09:03:51Z |
| format | Article |
| id | mit-1721.1/142447 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T09:03:51Z |
| publishDate | 2022 |
| publisher | American Physical Society (APS) |
| record_format | dspace |
| spelling | mit-1721.1/1424472023-04-19T20:20:21Z Observation of New Resonances Decaying to J/ψK+ and J/ψϕ Williams, Michael Massachusetts Institute of Technology. Department of Physics The first observation of exotic states with a new quark content $c \bar{c} u \bar{s}$ decaying to the $J/\psi K^+$ final state is reported with high significance from an amplitude analysis of the $B^+ \to J/\psi \phi K^+$ decay. The analysis is carried out using proton-proton collision data corresponding to a total integrated luminosity of 9 fb$^{-1}$ collected by the LHCb experiment at centre-of-mass energies of 7, 8 and 13 TeV. The most significant state, $Z_{cs}(4000)^+$, has a mass of $4003\pm6\,^{+\,\phantom{0}4}_{-\,14}$ MeV, a width of $131\pm15\pm26$ MeV, and spin-parity $J^P=1^+$, where the quoted uncertainties are statistical and systematic, respectively. A new $1^+$ $X(4685)$ state decaying to the $J/\psi \phi$ final state is also observed with high significance. In addition, the four previously reported $J/\psi \phi$ states are confirmed and two more exotic states, $Z_{cs}(4220)^+$ and $X(4630)$, are observed with significance exceeding five standard deviations. 2022-05-10T15:12:05Z 2022-05-10T15:12:05Z 2021 2022-05-10T15:06:51Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/142447 Williams, Michael. 2021. "Observation of New Resonances Decaying to J/ψK+ and J/ψϕ." Physical Review Letters, 127 (8). en 10.1103/PHYSREVLETT.127.082001 Physical Review Letters Creative Commons Attribution 4.0 International License https://creativecommons.org/licenses/by/4.0 application/pdf American Physical Society (APS) APS |
| spellingShingle | Williams, Michael Observation of New Resonances Decaying to J/ψK+ and J/ψϕ |
| title | Observation of New Resonances Decaying to J/ψK+ and J/ψϕ |
| title_full | Observation of New Resonances Decaying to J/ψK+ and J/ψϕ |
| title_fullStr | Observation of New Resonances Decaying to J/ψK+ and J/ψϕ |
| title_full_unstemmed | Observation of New Resonances Decaying to J/ψK+ and J/ψϕ |
| title_short | Observation of New Resonances Decaying to J/ψK+ and J/ψϕ |
| title_sort | observation of new resonances decaying to j ψk and j ψϕ |
| url | https://hdl.handle.net/1721.1/142447 |
| work_keys_str_mv | AT williamsmichael observationofnewresonancesdecayingtojpskandjpsph |