[Jlab-seminars] Theory Center Seminar

[Mary Fox]

Theory Center Seminar
Mon., April 11, 2016
1:00 p.m. (coffee at 12:45 p.m.)
CEBAF Center, Room L102

Daria Zieminska
Indiana University

*Observation of a New $B_s**^0**\pi^{\pm}$ State*

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.


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