Measurement of Angular and CP Asymmetries in D[superscript 0] → π[superscript +]π[superscript −]μ[superscript +]μ[superscrpt −] and D[superscript 0] → K[superscript + ]K[superscript −] μ[superscript +] μ[superscript −] Decays
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PhysRevLett.121.091801.pdf
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Author(s)
Aaij, R.
Adeva, B.
Adinolfi, M.
Aidala, C. A.
Ajaltouni, Z.
Akar, S.
Albicocco, P.
Albrecht, J.
Alessio, F.
Alexander, M.
Date Issued
August 2018
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Aaij, R., et al. “Measurement of Angular and CP Asymmetries in D[superscript 0] → π[superscript +]π[superscript −]μ[superscript +]μ[superscrpt −] and D[superscript 0] → K[superscript + ]K[superscript −] μ[superscript +] μ[superscript −] Decays.” Physical Review Letters, vol. 121, no. 9, Aug. 2018.
Version
Final published version
Abstract
The first measurements of the forward-backward asymmetry of the dimuon pair (A[subscript FB]), the triple-product asymmetry (A[subscript 2ϕ]), and the charge-parity-conjugation asymmetry (A[subscript CP]), in D[superscript 0]→π[superscript +]π[superscript -]μ[superscript +]μ[superscript -] and D[superscript 0]→K[superscript +]K[superscript -]μ[superscript +]μ[superscript -] decays are reported. They are performed using data from proton-proton collisions collected with the LHCb experiment from 2011 to 2016, corresponding to a total integrated luminosity of 5 fb[superscript -1]. The asymmetries are measured to be A[subscript FB](D[superscript 0]→π[superscript +]π[superscript -]μ[superscript +]μ[superscript -])=(3.3±3.7±0.6)%, A[subscript 2ϕ](D[superscript 0]→π[superscript +]π[superscript -]μ[superscript +]μ[superscript -])=(-0.6±3.7±0.6)%, A[subscript CP](D[superscript 0]→π[superscript +]π[superscript -]μ[superscript +}]μ[superscript -])=(4.9±3.8±0.7)%, A[subscript FB](D[superscript 0]→K[superscript +]K[superscript -]μ[superscript +]μ[superscript -])=(0±11±2)%, A[subscript 2ϕ](D[superscript 0]→K[superscript +]K[superscript -]μ[superscript +]μ[superscript -])=(9±11±1)%, A[subscript CP](D[superscript 0]→K[superscript +]K[superscript -]μ[superscript +]μ[superscript -])=(0±11±2)%, where the first uncertainty is statistical and the second systematic. The asymmetries are also measured as a function of the dimuon invariant mass. The results are consistent with the standard model predictions.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
http://dx.doi.org/10.1103/PhysRevLett.121.091801
