| | |
| | |
Stat |
Members: 3643 Articles: 2'488'730 Articles rated: 2609
29 March 2024 |
|
| | | |
|
Article overview
| |
|
Tetraquark Interpretation and Production Mechanism of the Belle $Y_b (10750)$-Resonance | Ahmed Ali
; Luciano Maiani
; Alexander Parkhomenko
; Wei Wang
; | Date: |
14 Dec 2020 | Abstract: | Recently, the Belle Collaboration has updated the analysis of the cross
sections for the processes $e^+ e^- o Upsilon(nS), pi^+ pi^-$ ($n = 1,,
2,, 3$) in the $e^+ e^-$ center-of-mass energy range from 10.52 to 11.02~GeV.
A new structure, called $Y_b (10750)$, with the mass $M (Y_b) = (10752.7 pm
5.9^{+0.7}_{-1.1})$~MeV and the Breit-Wigner width $Gamma (Y_b) = (35.5^{+17.6
+3.9}_{-11.3 -3.3})$~MeV was observed. We interpret $Y_b (10750)$ as a compact
$J^{PC} = 1^{--}$ state with a dominant tetraquark component. The mass
eigenstate $Y_b (10750)$ is treated as a linear combination of the
diquark-antidiquark and $b ar b$ components due to the mixing via gluonic
exchanges shown recently to arise in the limit of large number of quark colors.
The mixing angle between $Y_b$ and $Upsilon(5S)$ can be estimated from the
electronic width, recently determined to be $Gamma_{ee} (Y_b) = (13.7 pm
1.8)$~eV. The mixing provides a plausible mechanism for $Y_b (10750)$
production in high energy collisions from its $b ar b$ component and we work
out the Drell-Yan and prompt production cross sections for $p p o Y_b (10750)
o Upsilon (nS), pi^+ pi^-$ at the LHC. The resonant part of the dipion
invariant mass spectrum in $Y_b (10750) o Upsilon (1S), pi^+ pi^-$ and
the corresponding angular distribution of $pi^+$-meson in the dipion rest
frame are presented. | Source: | arXiv, 2012.07761 | Services: | Forum | Review | PDF | Favorites |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser claudebot
|
| |
|
|
|
| News, job offers and information for researchers and scientists:
| |