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| Preprint | PUBDB-2025-04964 |
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2025
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Please use a persistent id in citations: doi:10.3204/PUBDB-2025-04964
Report No.: arXiv:2506.11196
Abstract: We present a method to measure time-dependent CP violation in B0 decays produced in ϒ(4S)→B0B¯0 events at B factories without reconstructing the signal decay vertex. The method exploits the sensitivity of the tag B¯0 decay time to CP violation in the B0 signal. It relies on a compact e+e- interaction region and excellent vertex resolution, which enable precise measurement of the displacement between production and decay vertices of the tag meson. We study an application to B0→π0π0 decays using a simplified simulation that approximates the conditions of the Belle II experiment at the SuperKEKB collider. Our approach achieves a sensitivity on mixing-induced CP violation that would require 20 times larger samples with standard approaches. When incorporated into the B→ππ isospin analysis, the expected results would reduce the degeneracy of ϕ2 solutions and significantly increase precision. This work opens a path to previously inaccessible CP-violation studies enhancing and accelerating the reach of Belle II and future flavor physics programs.
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Journal Article
Unlocking time-dependent CP violation without signal vertexing at B factories
Physical review / D 112(3), 032011 (2025) [10.1103/rzr8-l6l8]
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