EPJ Web of Conferences
Volume 49, 2013HCP 2012 – Hadron Collider Physics Symposium 2012
|Number of page(s)||5|
|Published online||20 May 2013|
Charm mixing at LHCb
Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Germany
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We report a measurement of the time-dependent ratio of D0 → K+π− to D0 → K−π+ decay rates in D*+-tagged events using 1.0 fb−1 of integrated luminosity recorded by the LHCb experiment. We measure the mixing parameters x′2 = (−0.9 ± 1.3) × 10−4, y′ = (7.2 ± 2.4) × 10−3 and the ratio of doubly-Cabibbo-suppressed to Cabibbo-favored decay rates RD = (3.52 ± 0.15) × 10−3. The result excludes the no-mixing hypothesis with a probability corresponding to 9.1 standard deviations and represents the first observation of charm mixing from a single measurement.
© Owned by the authors, published by EDP Sciences, 2013
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 2.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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