Search for CP violation in $${{{textrm{D}}}^{{0}}} rightarrow {{textrm{K}} _{text {S}}^{{0}}} {{textrm{K}} _{text {S}}^{{0}}} $$ decays in proton–proton collisions at $$sqrt{s} = 13,text {Te}hspace{-.08em}text {V} $$ Journal Article uri icon

Overview

abstract

  • AbstractA search is reported for charge-parity $$CP$$; ; CP; ; violation in $${{{textrm{D}}}^{{0}}} rightarrow {{textrm{K}} _{text {S}}^{{0}}} {{textrm{K}} _{text {S}}^{{0}}} $$; ; ; ; D; ; 0; ; →; ; K; ; S; ; 0; ; ; K; ; S; ; 0; ; ; decays, using data collected in proton–proton collisions at $$sqrt{s} = 13,text {Te}hspace{-.08em}text {V} $$; ; ; s; ; =; 13; ; Te; ; V; ; recorded by the CMS experiment in 2018. The analysis uses a dedicated data set that corresponds to an integrated luminosity of 41.6$$,text {fb}^{-1}$$; ; ; ; fb; ; -; 1; ; ; ; , which consists of about 10 billion events containing a pair of b hadrons, nearly all of which decay to charm hadrons. The flavor of the neutral D meson is determined by the pion charge in the reconstructed decays $${{{textrm{D}}}^{{*+}}} rightarrow {{{textrm{D}}}^{{0}}} {{{mathrm{uppi }}}^{{+}}} $$; ; ; ; D; ; ; ; ; ∗; +; ; ; →; ; ; D; ; 0; ; ; ; π; ; +; ; ; and $${{{textrm{D}}}^{{*-}}} rightarrow {overline{{textrm{D}}}^{{0}}} {{{mathrm{uppi }}}^{{-}}} $$; ; ; ; D; ; ; ; ; ∗; -; ; ; →; ; ; D; ¯; ; 0; ; ; ; π; ; -; ; ; . The $$CP$$; ; CP; ; asymmetry in $${{{textrm{D}}}^{{0}}} rightarrow {{textrm{K}} _{text {S}}^{{0}}} {{textrm{K}} _{text {S}}^{{0}}} $$; ; ; ; D; ; 0; ; →; ; K; ; S; ; 0; ; ; K; ; S; ; 0; ; ; is measured to be $$A_{CP} ({{textrm{K}} _{text {S}}^{{0}}} {{textrm{K}} _{text {S}}^{{0}}} ) = (6.2 pm 3.0 pm 0.2 pm 0.8)%$$; ; ; A; ; CP; ; ; ; (; ; K; ; S; ; 0; ; ; K; ; S; ; 0; ; ); ; =; ; (; 6.2; ±; 3.0; ±; 0.2; ±; 0.8; ); ; %; ; , where the three uncertainties represent the statistical uncertainty, the systematic uncertainty, and the uncertainty in the measurement of the $$CP$$; ; CP; ; asymmetry in the $${{{textrm{D}}}^{{0}}} rightarrow {{textrm{K}} _{text {S}}^{{0}}} {{{mathrm{uppi }}}^{{+}}} {{{mathrm{uppi }}}^{{-}}} $$; ; ; ; D; ; 0; ; →; ; K; ; S; ; 0; ; ; ; π; ; +; ; ; ; π; ; -; ; ; decay. This is the first $$CP$$; ; CP; ; asymmetry measurement by CMS in the charm sector as well as the first to utilize a fully hadronic final state.

publication date

  • December 6, 2024

has restriction

  • gold

Date in CU Experts

  • December 11, 2024 8:49 AM

Full Author List

  • Hayrapetyan A; Tumasyan A; Adam W; Andrejkovic JW; Bergauer T; Chatterjee S; Damanakis K; Dragicevic M; Hussain PS; Jeitler M

author count

  • 2383

Other Profiles

Electronic International Standard Serial Number (EISSN)

  • 1434-6052

Additional Document Info

volume

  • 84

issue

  • 12

number

  • 1264