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Observation of the ...
Observation of the Mass Difference Between Neutral Charm-Meson Eigenstates
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- Aaij, R. (author)
- Nikhef Natl Inst Subatom Phys, Amsterdam, Netherlands
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- Eklund, Lars (author)
- Uppsala universitet,Kärnfysik,Univ Glasgow, Sch Phys & Astron, Glasgow, Lanark, Scotland
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- Zunica, G. (author)
- Univ Manchester, Dept Phys & Astron, Manchester, Lancs, England
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(creator_code:org_t)
- American Physical Society, 2021
- 2021
- English.
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In: Physical Review Letters. - : American Physical Society. - 0031-9007 .- 1079-7114. ; 127:11
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Abstract
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- A measurement of mixing and CP violation in neutral charm mesons is performed using data reconstructed in proton-proton collisions collected by the LHCb experiment from 2016 to 2018, corresponding to an integrated luminosity of 5.4 fb−1. A total of 30.6 million D0→K0Sπ+π− decays are analyzed using a method optimized for the measurement of the mass difference between neutral charm-meson eigenstates. Allowing for CP violation in mixing and in the interference between mixing and decay, the mass and decay-width differences are measured to be xCP=[3.97±0.46(stat)±0.29(syst)]×10−3 and yCP=[4.59±1.20(stat)±0.85(syst)]×10−3, respectively. The CP-violating parameters are measured as Δx=[−0.27±0.18(stat)±0.01(syst)]×10−3 and Δy=[0.20±0.36(stat)±0.13(syst)]×10−3. This is the first observation of a nonzero mass difference in the D0 meson system, with a significance exceeding seven standard deviations. The data are consistent with CP symmetry and improve existing constraints on the associated parameters.
Subject headings
- NATURVETENSKAP -- Fysik -- Subatomär fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Subatomic Physics (hsv//eng)
Publication and Content Type
- ref (subject category)
- art (subject category)
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