Publication

Inclusive B-meson flavour-tagging algorithm at LHCb

Aurelio Bay
2025

Abstract

A new algorithm is developed to identify the flavour of neutral B mesons at production in pp collisions by utilising all tracks from the hadronisation process. The algorithm is calibrated separately for B 0 and ${B}_s^0$ mesons using B 0 → J / ψK + π − and ${B}_s^0\to {D}_s^{-}{\pi}^{+}$ decays from pp collision data collected by the LHCb experiment at a centre-of-mass energy of 13 TeV. This new algorithm improves the tagging power by 35% for B 0 mesons and 20% for ${B}_s^0$ mesons when compared to the combined performance of the existing LHCb flavour-tagging algorithms.

Official source

https://infoscience.epfl.ch/entities/publication/7870ea59-3c8e-499f-bba4-b56e5c9210b4

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Aurelio Bay
2025

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/7870ea59-3c8e-499f-bba4-b56e5c9210b4

About this result

Related concepts (23)

Pion

In particle physics, a pion (or a pi meson, denoted with the Greek letter pi: _Pion) is any of three subatomic particles: _Pion0, _Pion+, and _Pion-. Each pion consists of a quark and an antiquark and is therefore a meson. Pions are the lightest mesons and, more generally, the lightest hadrons. They are unstable, with the charged pions _Pion+ and _Pion- decaying after a mean lifetime of 26.033 nanoseconds (2.6033e-8 seconds), and the neutral pion _Pion0 decaying after a much shorter lifetime of 85 attoseconds (8.

Meson

In particle physics, a meson (ˈmiːzɒn,_ˈmɛzɒn) is a type of hadronic subatomic particle composed of an equal number of quarks and antiquarks, usually one of each, bound together by the strong interaction. Because mesons are composed of quark subparticles, they have a meaningful physical size, a diameter of roughly one femtometre (10^−15 m), which is about 0.6 times the size of a proton or neutron. All mesons are unstable, with the longest-lived lasting for only a few tenths of a nanosecond.

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.

Related publications (8)

Inclusive B-meson flavour-tagging algorithm at LHCb

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