2017/09/21 by Nicolas Boisvert Beaudry, Beaudry, Nicolas Boisvert, Alakabha Datta +7 · 2 citations
Medicine · Physics and Astronomy · #Black Holes and Theoretical Physics #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #Medical Imaging Techniques and Applications #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.1709.07142
openalex publication_date 2017/09/21 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
For a number of years, there has been a certain inconsistency among the\nmeasurements of the branching ratios and CP asymmetries of the four B \→ \π\nK decays (B+ \→ \π+ K0, B+ \→ \π0 K+, B0 \→ \π- K+, B0\n\→ \π0 K0). In this paper, we re-examine this B \→ \π K puzzle. We\nfind that the key unknown parameter is |C'/T'|, the ratio of color-suppressed\nand color-allowed tree amplitudes. If this ratio is large, |C'/T'| = 0.5, the\nSM can explain the data. But if it is small, |C'/T'| = 0.2, the SM cannot\nexplain the B \→ \π K puzzle -- new physics (NP) is needed. The two types\nof NP that can contribute to B \→ \π K at tree level are Z' bosons and\ndiquarks. Z' models can explain the puzzle if the Z' couples to\nright-handed u u and/or d d, with gRdd \≠ gRuu.\nInterestingly, half of the many Z' models proposed to explain the present\nanomalies in b \→ s \μ+ \μ- decays have the required Z' couplings to\nu u and/or d d. Such models could potentially explain both the\nb \→ s \μ+ \μ- anomalies and the B \→ \π K puzzle. The addition of a\ncolor sextet diquark that couples to ud can also explain the puzzle.\n