Improved Measurement of CP Asymmetry in the Neutral B Meson System
T. Higuchi (for the Belle collaboration)
TL;DR
This paper reports an improved measurement of the CP violation parameter sin2phi1 in the neutral B meson system using data from the Belle detector, providing a more precise value consistent with the Standard Model.
Contribution
It presents a new measurement of sin2phi1 with increased data and refined analysis techniques, enhancing the precision of CP violation studies in B mesons.
Findings
Measured sin2phi1 = 0.82 +/- 0.12(stat) +/- 0.05(syst)
Results are consistent with Standard Model predictions
Provides a more precise CP violation parameter value
Abstract
We present an improved measurement of the standard model CP violation parameter sin2phi1 (also known as sin2beta) based on a sample of 45x10^6 BBbar pairs collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. One neutral B meson is reconstructed in the J/psiKS, Psi(2S)KS, chi_c1KS, eta_cKS, J/psiK^*0, or J/psiKL CP-eigenstate decay channel and the flavor of accompanying B meson is identified from its decay products. From the asymmetry in the distribution of the time intervals between the two B meson decay points, we obtain sin2phi1 = 0.82 +/- 0.12(stat) +/- 0.05(syst). The result is preliminary.
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.
Taxonomy
TopicsParticle physics theoretical and experimental studies · Quantum Chromodynamics and Particle Interactions · Neutrino Physics Research