TY  - JOUR
AU  - LHCb Collaboration (Aaij, R. et al
AU  - Garcia Martin, L. M.
AU  - Henry, L.
AU  - Jashal, B. K.
AU  - Martinez-Vidal, F.
AU  - Oyanguren, A.
AU  - Remon Alepuz, C.
AU  - Ruiz Vidal, J.
AU  - Sanchez Mayordomo, C.
PY  - 2019
DA  - 2019//
TI  - Measurement of the Mass Difference Between Neutral Charm-Meson Eigenstates
T2  - Phys. Rev. Lett.
JO  - Physical Review Letters
SP  - 231802 - 10pp
VL  - 122
IS  - 23
PB  - Amer Physical Soc
AB  - 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 x 10(6) D-0 -> K-S(0)pi(+)pi(-) decays reconstructed in proton-proton collisions collected by the LHCb experiment in 2011 and 2012. Allowing for CP violation in mixing and in the interference between mixing and decay, we measure the CP-averaged normalized mass difference x(cp)= [2.7 +/- 1.6(stat) +/- 0.4(syst)] x 10(-3) and the CP-violating parameter Delta x = [-0.53 +/- 0.70(stat) +/- 0.22(syst)] x 10(-3). The results are consistent with CP symmetry. These determinations are the most precise from a single experiment and, combined with current world-average results, yield the fast evidence that the masses of the neutral charm-meson eigenstates differ.
SN  - 0031-9007
UR  - https://arxiv.org/abs/1903.03074
UR  - https://doi.org/10.1103/PhysRevLett.122.231802
DO  - 10.1103/PhysRevLett.122.231802
LA  - English
N1  - WOS:000471988900004
ID  - LHCbCollaborationAaij_etal2019
ER  -