Publication

Amplitude analysis of the Ξ c+ → pK−π+ decay and Ξc+ baryon polarization measurement in semileptonic beauty-hadron decays

Aurelio Bay
2025

Abstract

An amplitude analysis of the Ξ c+ → pK−π+ decay together with a measurement of the Ξ c+ polarization vector in semileptonic beauty-hadron decays is presented. The analysis is performed using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9 fb − 1 . An amplitude model is developed and the resonance fractions as well as two- and three-body decay parameters are reported. A sizeable Ξ c+ polarization is found. A large sensitivity of the Ξ c+ → pK−π+ decay to the polarization is seen, making the amplitude model suitable for Ξ c+ polarization measurements in other systems.

Official source

https://infoscience.epfl.ch/entities/publication/5f5e3c56-b3cb-4ab5-88c2-9877e67d8b02

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Aurelio Bay
2025

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/5f5e3c56-b3cb-4ab5-88c2-9877e67d8b02

About this result

Related concepts (30)

LHCb experiment

The LHCb (Large Hadron Collider beauty) experiment is a particle physics detector experiment collecting data at the Large Hadron Collider at CERN. LHCb is a specialized b-physics experiment, designed primarily to measure the parameters of CP violation in the interactions of b-hadrons (heavy particles containing a bottom quark). Such studies can help to explain the matter-antimatter asymmetry of the Universe. The detector is also able to perform measurements of production cross sections, exotic hadron spectroscopy, charm physics and electroweak physics in the forward region.

Polarization (physics)

Polarization (also polarisation) is a property of transverse waves which specifies the geometrical orientation of the oscillations. In a transverse wave, the direction of the oscillation is perpendicular to the direction of motion of the wave. A simple example of a polarized transverse wave is vibrations traveling along a taut string (see image); for example, in a musical instrument like a guitar string. Depending on how the string is plucked, the vibrations can be in a vertical direction, horizontal direction, or at any angle perpendicular to the string.

Circular polarization

In electrodynamics, circular polarization of an electromagnetic wave is a polarization state in which, at each point, the electromagnetic field of the wave has a constant magnitude and is rotating at a constant rate in a plane perpendicular to the direction of the wave. In electrodynamics, the strength and direction of an electric field is defined by its electric field vector. In the case of a circularly polarized wave, the tip of the electric field vector, at a given point in space, relates to the phase of the light as it travels through time and space.

Related publications (5)

Amplitude analysis of the Ξ <sub>c</sub><sup>+</sup> → pK<sup>−</sup>π<sup>+</sup> decay and Ξ<sub>c</sub><sup>+</sup> baryon polarization measurement in semileptonic beauty-hadron decays

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