Speaker
Prof.
Jean-Marc Richard
(Institut de Physique Nucleaire, Lyon)
Description
A detailed study is presented of the flavor-exotic isoscalar
$T_{bb}^-\equiv b b \bar u \bar d$ tetraquark. with spin and parity $J^P=1^+$.
In realistic quark models, with a careful treatment of the 4-body problem, the $T_{bb}^-$ is
approximately $150\,$MeV below the strong decay threshold $B^-\bar {B^*}^{0}$ and $105\,$MeV below
the electromagnetic decay threshold $B^- \bar B^0 \gamma$.
The lifetime of $T_{bb}$ is estimated, as well as the dominant decay modes where the
tetraquark might be looked for in future experiments. Its total decay width is
$\Gamma \simeq 79. \times 10^{-15}\,$GeV and therefore
its lifetime $\tau \simeq 8.3\,$ps. The promising final states are ${B^*}^{-}\, {D^*}^{+} \, l^- \, \bar \nu_l$
and $\bar {B^*}^{0} \, {D^*}^{0} \, l^- \, \bar \nu_l $ among the semileptonic decays, and, among the non-leptonic ones,
${B^*}^{-} \, {D^*}^{+} \, {D_s^*}^-$, $\bar {B^*}^{0} \, {D^*}^{0} \, {D_s^*}^- $
${B^*}^{-} \, {D^*}^{+} \, \rho^-$.
Primary author
Prof.
Jean-Marc Richard
(Institut de Physique Nucleaire, Lyon)
Co-authors
Prof.
Alfredo Valcarce
(Salamanca)
Prof.
Eliecer Hernandez
(Salamanca, Spain)
Prof.
Javier Vijande
(Valencia, Spain)
