Observation of the doubly charmed baryon decay $\it{\Xi_{cc}^{++}\to \Xi_{c}^{'+}\pi^{+}}$

TL;DR

This paper reports the first observation of the doubly charmed baryon decay c^{++} o ^{'+}\u03c0^{+} using LHCb data, measuring its branching fraction relative to a similar decay, advancing understanding of heavy baryon decays.

Contribution

The study provides the first measurement of the c^{++} o ^{'+}^{+} decay branching fraction relative to c^{++} o ^{+}^{+}, using partial reconstruction techniques.

Findings

Measured the branching fraction ratio as 1.41 .17 .10.

First observation of this doubly charmed baryon decay.

Used partial reconstruction with missing photon.

Abstract

The $\it{\Xi_{cc}^{++}\to \Xi_{c}^{'+}\pi^{+}}$ decay is observed using proton-proton collisions collected by the LHCb experiment at a centre-of-mass energy of $13\mathrm{\,Te\kern -0.1em V}$, corresponding to an integrated luminosity of $5.4\,\mathrm{fb}^{-1}$. The $\it{\Xi_{cc}^{++}\to \Xi_{c}^{'+}\pi^{+}}$ decay is reconstructed partially, where the photon from the $\it{\Xi_{c}^{'+} \to \Xi_{c}^{+}\gamma}$ decay is not reconstructed and the $pK^-\pi^+$ final state of the $\it{\Xi_{c}^{+}}$ baryon is employed. The $\it{\Xi_{cc}^{++}\to \Xi_{c}^{'+}\pi^{+}}$ branching fraction relative to that of the $\it{\Xi_{cc}^{++}\to \Xi_{c}^{+}\pi^{+}}$ decay is measured to be $1.41 \pm 0.17 \pm 0.10$, where the first uncertainty is statistical and the second systematic.