Abstract
Charmed hadrons are a unique probe of CP violation with up-type quarks. Yet, CP violation in the charm sector is very suppressed by tiny CKM phases in the Standard Model. Any large non-zero measurement would thus be a sign of New Physics. We report on recent measurements of CP asymmetries in multibody charmed meson and baryon decays. The CP asymmetries are studied in regions of the Dalitz space.
Highlights
The Standard model of elementary particles (SM) describes mixing using a single Cabibbo-KobayashiMaskawa (CKM) matrix
It was commonly assumed that the observation of asymmetries of the order of 1% in charm decays would be an indication of new sources of CP violation [1, 2, 3, 4]
The sensitivity for CP violation searches has substantially increased with the advent of the large LHCb data set
Summary
The Standard model of elementary particles (SM) describes mixing using a single Cabibbo-KobayashiMaskawa (CKM) matrix. Certain extensions to the SM predict an increase of up to an order of magnitude in penguin contributions in charm decays. In this context, three- and four-body decays benefit from rich resonance structures with interfering amplitudes modulated by strong-phase variations across the phase space. Direct CP violation can occur through interferences between penguin and tree level contributions. For this reason, we use the Singly-Cabbibo Suppressed (SCS) decays, D+ → π+π−π+, D0 → π+π−π−π+, and D0 → K+K−π+π−, where both penguin and tree level processes contribute. We reconstruct three- and four- body decays and analyse them using model-independent methods. We reconstruct D+s → π−π+π+ and D0 → K+π+π−π− as control channels, where CP violation is expected to be negligible. The LHCb detector is described in detail elsewhere [7]
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