A search for the rare two-body charmless baryonic decay $B^+ \to p \bar\Lambda$ is performed with $pp$ collision data, corresponding to an integrated luminosity of $3\mbox{\,fb}^{-1}$, collected by ...the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. An excess of $B^+ \to p \bar\Lambda$ candidates with respect to background expectations is seen with a statistical significance of 4.1 standard deviations, and constitutes the first evidence for this decay. The branching fraction, measured using the $B^+ \to K^0_{\mathrm S} \pi^+$ decay for normalisation, is \begin{eqnarray} \mathcal{B}(B^+ \to p \bar\Lambda) & = & ( 2.4 \,^{+1.0}_{-0.8} \pm 0.3 ) \times 10^{-7} \,, \nonumber \end{eqnarray} where the first uncertainty is statistical and the second systematic.
Journal of High Energy Physics 04 (2019) 063 The resonant structure of the doubly Cabibbo-suppressed decay $D^+ \to
K^-K^+K^+$ is studied for the first time. The measurement is based on a sample
of ...pp-collision data, collected at a centre-of-mass energy of 8 TeV with the
LHCb detector and corresponding to an integrated luminosity of 2 fb$^-1$. The
amplitude analysis of this decay is performed with the isobar model and a
phenomenological model based on an effective chiral Lagrangian. In both models
the S-wave component in the $K^-K^+$ system is dominant, with a small
contribution of the $\phi(1020)$ meson and a negligible contribution from
tensor resonances. The $K^-K^+$ scattering amplitudes for the considered
combinations of spin (0,1) and isospin (0,1) of the two-body system are
obtained from the Dalitz plot fit with the phenomenological decay amplitude.
The resonant structure of the doubly Cabibbo-suppressed decay \(D^+ \to K^-K^+K^+\) is studied for the first time. The measurement is based on a sample of pp-collision data, collected at a ...centre-of-mass energy of 8 TeV with the LHCb detector and corresponding to an integrated luminosity of 2 fb\(^-1\). The amplitude analysis of this decay is performed with the isobar model and a phenomenological model based on an effective chiral Lagrangian. In both models the S-wave component in the \(K^-K^+\) system is dominant, with a small contribution of the \(\phi(1020)\) meson and a negligible contribution from tensor resonances. The \(K^-K^+\) scattering amplitudes for the considered combinations of spin (0,1) and isospin (0,1) of the two-body system are obtained from the Dalitz plot fit with the phenomenological decay amplitude.
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