A search for CP violation in D0->KS0K+pi- and D0->KS0K-pi+ decays is reported. The search is performed using an unbinned model-independent method known as the energy test that probes local CP violation in the phase space of the decays. The data analysed correspond to an integrated luminosity of 5.4 fb-1 collected in proton-proton collisions by the LHCb experiment at a centre-of-mass energy of s = 13 TeV, amounting to approximately 950 thousand and 620 thousand signal candidates for the D0->KS0K-pi+ and D0->KS0K+pi- modes, respectively. The method is validated using D0 -> K-pi+pi-pi+ and D0->KS0pi+pi- decays, where CP-violating effects are expected to be negligible, and using background-enhanced regions of the signal decays. The results are consistent with CP symmetry in both the D0->KS0K-pi+ and the D0->KS0K+pi- decays, with p-values for the hypothesis of no CP violation of 70% and 66%, respectively.
Search for CP violation in the phase space of D0->KS0K\pm\pi\mp decays with the energy test
Bassi G.Membro del Collaboration Group
;Kleijne N.Membro del Collaboration Group
;Morello M. J.Membro del Collaboration Group
;Passaro D.Membro del Collaboration Group
;Pica L.Membro del Collaboration Group
;Ribatti R.Membro del Collaboration Group
;Riccardi D.Membro del Collaboration Group
;
2024
Abstract
A search for CP violation in D0->KS0K+pi- and D0->KS0K-pi+ decays is reported. The search is performed using an unbinned model-independent method known as the energy test that probes local CP violation in the phase space of the decays. The data analysed correspond to an integrated luminosity of 5.4 fb-1 collected in proton-proton collisions by the LHCb experiment at a centre-of-mass energy of s = 13 TeV, amounting to approximately 950 thousand and 620 thousand signal candidates for the D0->KS0K-pi+ and D0->KS0K+pi- modes, respectively. The method is validated using D0 -> K-pi+pi-pi+ and D0->KS0pi+pi- decays, where CP-violating effects are expected to be negligible, and using background-enhanced regions of the signal decays. The results are consistent with CP symmetry in both the D0->KS0K-pi+ and the D0->KS0K+pi- decays, with p-values for the hypothesis of no CP violation of 70% and 66%, respectively.| File | Dimensione | Formato | |
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JHEP03(2024)107.pdf
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