477 citations · 2.2k across the 45 of their papers we have counts for
36 papers · 1 filter
Irreducible Bhabha background in the detection of muonium-antimuonium conversion
Mitrajyoti Ghosh, Kevin Liguori, Takemichi Okui +1
Experiments such as MACS and the proposed MACE study muonium-antimuonium conversion by the energies of the final-state . The and from an antimuonium decay tend t…
New Bounds on Heavy QCD Axions from Big Bang Nucleosynthesis
Tae Hyun Jung, Takemichi Okui, Kohsaku Tobioka +1
We study Big Bang Nucleosynthesis (BBN) constraints on heavy QCD axions. BBN offers a powerful probe of new physics that modifies the neutron-to-proton ratio during the process, th…
Neutrino properties from muonium-antimuonium mixing
Mitrajyoti Ghosh, Kevin Liguori, Takemichi Okui +1
The nature of neutrino mass -- whether neutrinos are Dirac or Majorana particles -- remains one of the central open questions in particle physics. While observation of neutrinoless…
Decoding the excess at Belle II: kinematics, operators, and masses
Kåre Fridell, Mitrajyoti Ghosh, Takemichi Okui +1
An excess in the branching fraction for recently measured at Belle II may be a hint of new physics. We perform thorough likelihood analyses for different new physi…
Primordial black holes from bubble collisions during a first-order phase transition
Tae Hyun Jung, Takemichi Okui
We study the possibility of production of primordial black holes (PBHs) from bubble collisions during a first-order phase transition. While typical colliding bubbles are small and…
Heavy QCD Axion at Belle II: Displaced and Prompt Signals
Emilie Bertholet, Sabyasachi Chakraborty, Vazha Loladze +3
The QCD axion is a well-motivated addition to the standard model to solve the strong problem. If the axion acquires mass dominantly from a hidden sector, it can be as heavy…