First Observation of B(B+- K+nu nu) Nearly 3 Sigma Away from Standard Model Expectation

Strategic Insights -

The Belle II experiment has made a groundbreaking discovery in the realm of physics, observing a deviation from the Standard Model expectation in the decay rate of B(B+- K+nu nu), a phenomenon that could potentially unlock the secrets of neutrino physics. The study, funded by the European Union, SPRINT FAPESP/CNRS, and Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP), has garnered significant attention from the scientific community.

Key Takeaways:

  • The Belle II experiment has observed a deviation from the Standard Model expectation in the decay rate of B(B+- K+nu nu), with the result lying almost 3 sigma away.
  • The study has explored the correlations between the measured decay rate and other observables, such as B(B - K & lowast;nu nu) and FL(B - K & lowast;nu nu), to disentangle among scenarios involving left-handed neutrinos and those with right-handed neutrinos.
  • The research has found that the high-p T tails of Drell-Yan processes studied at the Large Hadron Collider (LHC) provide important constraints that help exclude some of the scenarios consistent with the Belle II result.
  • The study has shed light on the potential role of a light right-handed neutrino in the SMEFT (Standard Model Effective Field Theory) and its impact on neutrino physics.
  • The findings of the study have significant implications for our understanding of neutrino properties and the development of new theories in physics.
  • The research was conducted by a team of investigators at the National Center for Scientific Research (CNRS) and was funded by the European Union, SPRINT FAPESP/CNRS, and Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP).
  • The study was published in The European Physical Journal C, Vol. 84, No. 8, 2024.

Statistics:

  • The observed deviation from the Standard Model expectation in the decay rate of B(B+- K+nu nu) lies almost 3 sigma away from the predicted value.
  • The study has explored the correlations between the measured decay rate and other observables, such as B(B - K & lowast;nu nu) and FL(B - K & lowast;nu nu), to disentangle among scenarios involving left-handed neutrinos and those with right-handed neutrinos.
  • The research has found that the high-p T tails of Drell-Yan processes studied at the LHC provide important constraints that help exclude some of the scenarios consistent with the Belle II result.

Sources:

  • The European Physical Journal C, Vol. 84, No. 8, 2024. "Disentangling Left and Right-handed Neutrino Effects In B- k( )Nn."
  • National Center for Scientific Research (CNRS). "Report: Investigators at National Center for Scientific Research (CNRS) Report Findings in Physics [Disentangling Left and Right-handed Neutrino Effects In B- k( )Nn]."
  • NewsRx LLC. "Investigators at National Center for Scientific Research (CNRS) Report Findings in Physics [Disentangling Left and Right-handed Neutrino Effects In B- k( )Nn]." Journal of Physics Research, 2024; p 186.