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http://hdl.handle.net/2445/170962
Title: | Measurement of the Mass Difference Between Neutral Charm-Meson Eigenstates |
Author: | Alfonso Albero, Alejandro Calvo Gómez, Míriam Camboni, Alessandro Coquereau, Samuel Garrido Beltrán, Lluís Gascón Fora, David Gironella Gironell, Pere Graciani Díaz, Ricardo Graugés Pous, Eugeni Vilasis-Cardona, Xavier LHCb Collaboration |
Keywords: | Bosons Mesons (Física nuclear) Bosons Mesons (Nuclear physics) |
Issue Date: | 14-Jun-2019 |
Publisher: | American Physical Society |
Abstract: | We report a measurement of the mass difference between neutral charm-meson eigenstates using a novel approach that enhances sensitivity to this parameter. We use 2.3 × 10 6 D 0 → K 0 S π + π − decays reconstructed in proton-proton collisions collected by the LHCb experiment in 2011 and 2012. Allowing for C P violation in mixing and in the interference between mixing and decay, we measure the C P -averaged normalized mass difference x C P = [ 2.7 ± 1.6 ( stat ) ± 0.4 ( syst ) ] × 10 − 3 and the C P -violating parameter Δ x = [ − 0.53 ± 0.70 ( stat ) ± 0.22 ( syst ) ] × 10 − 3 . The results are consistent with C P symmetry. These determinations are the most precise from a single experiment and, combined with current world-average results, yield the first evidence that the masses of the neutral charm-meson eigenstates differ. |
Note: | Reproducció del document publicat a: https://doi.org/10.1103/PhysRevLett.122.231802 |
It is part of: | Physical Review Letters, 2019, vol. 122, num. 23, p. 231802 |
URI: | http://hdl.handle.net/2445/170962 |
Related resource: | https://doi.org/10.1103/PhysRevLett.122.231802 |
ISSN: | 0031-9007 |
Appears in Collections: | Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB)) Articles publicats en revistes (Física Quàntica i Astrofísica) |
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