/ hep-ex FERMILAB-PUB-16-038-E

Observation of a new $B_s^0 \pi^\pm$ state

Published in: Phys.Rev.Lett.
Pages: 8

Abstract: We report the observation of a narrow structure, $X(5568)$, in the decay sequence $X(5568) \rightarrow B_s^0 \pi^{\pm}$, $B_s^0 \rightarrow J/\psi \phi$, $J/\psi\rightarrow \mu^+ \mu^-$, $\phi \rightarrow K^+K^-$. This is the first observation of a hadronic state with valence quarks of four different flavors. The mass and natural width of the new state are measured to be $m = 5567.8 \pm 2.9 {\rm \thinspace (stat)} ^{+0.9}_{-1.9} {\rm \thinspace (syst)}$ MeV/$c^2$ and $\Gamma = 21.9 \pm 6.4 {\rm \thinspace (stat)} ^{+5.0}_{-2.5} {\rm \thinspace (syst)}$ MeV/$c^2$, and the significance including look-elsewhere effect and systematic uncertainties is 5.1$\sigma$. The observation is based on$10.4~\rm{fb^{-1}}$ of $p \overline p$ collision data at $\sqrt{s}$ = 1.96 TeV collected by the D0 experiment at the Fermilab Tevatron collider.

Note: 8 pages, 4 figures, submitted to Phys. Rev. Lett

Total numbers of views: 717
Numbers of unique views: 408
Запись создана 2016-03-11, последняя модификация 2016-03-11

Внешние ссылки:
Полный текст
SYMMETRY
PRESSRELEASE
Оценить этот документ:

1
2
3

(Еще не рецензированная)