@article{407cfd99bb8848b3aa63544cdcd38323,
title = "Measurement of the Mass Difference between Neutral Charm-Meson Eigenstates",
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 2.3×106 D0→KS0π+π- 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 xCP=[2.7±1.6(stat)±0.4(syst)]×10-3 and the CP-violating parameter Δx=[-0.53±0.70(stat)±0.22(syst)]×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 first evidence that the masses of the neutral charm-meson eigenstates differ.",
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Martinelli and \{Martinez Santos\}, D. and \{Martinez Vidal\}, F. and A. Massafferri and M. Materok and R. Matev and A. Mathad and Z. Mathe and V. Matiunin and C. Matteuzzi and Mattioli, \{K. R.\} and A. Mauri and E. Maurice and B. Maurin and M. McCann and A. McNab and R. McNulty and Mead, \{J. V.\} and B. Meadows and C. Meaux and N. Meinert and D. Melnychuk and M. Merk and A. Merli and E. Michielin and Milanes, \{D. A.\} and E. Millard and Minard, \{M. N.\} and L. Minzoni and Mitzel, \{D. S.\} and A. M{\"o}dden and A. Mogini and Moise, \{R. D.\} and T. Momb{\"a}cher and Monroy, \{I. A.\} and S. Monteil and M. Morandin and G. Morello and Morello, \{M. J.\} and J. Moron and Morris, \{A. B.\} and R. Mountain and F. Muheim and M. Mukherjee and M. Mulder and D. M{\"u}ller and J. M{\"u}ller and K. M{\"u}ller and V. M{\"u}ller and Murphy, \{C. H.\} and D. Murray and P. Naik and T. Nakada and R. Nandakumar and A. Nandi and T. Nanut and I. Nasteva and M. Needham and N. Neri and S. 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year = "2019",
month = jun,
day = "14",
doi = "10.1103/PhysRevLett.122.231802",
language = "English",
volume = "122",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "23",
}