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 D0 → K0S π+ 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 x_CP = [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.

Aaij, R., Abellán Beteta, C., Adeva, B., Adinolfi, M., Aidala, C., Ajaltouni, Z., et al. (2019). Measurement of the Mass Difference Between Neutral Charm-Meson Eigenstates. PHYSICAL REVIEW LETTERS, 122(23), 1-10 [10.1103/PhysRevLett.122.231802].

Measurement of the Mass Difference Between Neutral Charm-Meson Eigenstates

Betti, F.;Capriotti, L.;Carbone, A.;Ferrari, F.;Galli, D.;Patrignani, C.;Perazzini, S.;Pisani, F.;Vagnoni, V.;Zucchelli, S.
2019

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 D0 → K0S π+ 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 x_CP = [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.
2019
Aaij, R., Abellán Beteta, C., Adeva, B., Adinolfi, M., Aidala, C., Ajaltouni, Z., et al. (2019). Measurement of the Mass Difference Between Neutral Charm-Meson Eigenstates. PHYSICAL REVIEW LETTERS, 122(23), 1-10 [10.1103/PhysRevLett.122.231802].
Aaij, R.; Abellán Beteta, C.; Adeva, B.; Adinolfi, M.; Aidala, C.A.; Ajaltouni, Z.; Akar, S.; Albicocco, P.; Albrecht, J.; Alessio, F.; Alexander, M.;...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/701055
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