Measurement of the gamma CKM angle with Belle II

Sumitted to PubDB: 2017-10-08

Category: Talk, Visibility: Public

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Authors	Hulya Atmacan
Date	Sept. 1, 2017
Belle II Number	BELLE2-TALK-CONF-2017-091
Abstract	The CKM angle gamma is the least well known of the angles of the unitarity triangle and the only one that is accessible with tree-level decays in a theoretically clean way. It provides a Standard Model benchmark against which other measurements can be compared. The key method to measure gamma is through the interference between B^+ to D^0 K^+ and B^+ to \overline{D}^0 K^+ decays which occurs if the final state of the charm-meson decay is accessible to both the D^0 and \overline{D}^0 mesons. To achieve the best sensitivity, a large variety of D and B decay modes is required and is possible at Belle II experiment as almost any final state can be reconstructed including those with photons. With a data sample corresponding to an integrated luminosity of 50 ab^-1 expected by 2026, a determination of gamma with a precision of 1 degree or better is foreseen. This will approximately match the uncertainty on this parameter from indirect constraints from other measurements.
Conference	PANIC2017