Exploiting the symmetries of P and S wave for B →Kμ +μ

Lars Hofer, Joaquim Matias

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15 Citations (Scopus)


© 2015, The Author(s). Abstract: After summarizing the current theoretical status of the four-body decay B → K∗(→ Kπ)μ+μ−, we apply the formalism of spin-symmetries to the full angular distribution, including the S-wave part involving a broad scalar resonance K0∗. While we recover in the P-wave sector the known relation between the angular observables Pi(′), we find in the S-wave sector two new relations connecting the coefficients of the S-wave angular distribution and reducing the number of independent S-wave observables from six to four. Included in the experimental data analysis, these relations can help to reduce the background from S-wave pollution. We further point out the discriminative power of the maximum of the angular observable P2 as a charm-loop insensitive probe of right-handed currents. Moreover, we show that in absence of right-handed currents the angular observables P4′ and P5′ fulfill the relation P4′ = βP5′ at the position where P2 reaches its maximum.
Original languageEnglish
Article number104
JournalJournal of High Energy Physics
Issue number9
Publication statusPublished - 26 Sep 2015


  • B-Physics
  • Rare Decays


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