289 citations · 1.6k across the 39 of their papers we have counts for
42 papers
Excluding MeV-scale QCD axions by at KTeV
Takaya Iwai, Ryosuke Sato, Kohsaku Tobioka +1
An interesting proposal suggests that a QCD axion coupling to the up quark, down quark, and electron remains viable for an axion mass near 10~MeV. In this paper, this possibi…
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…
High Energy Vector Boson Scattering in Four-Body Final States to Probe Higgs Cubic, Quartic, and HEFT interactions
Shameran Mahmud, Kohsaku Tobioka
We compute the energy scales of perturbative unitarity violation in various vector boson scattering (VBS) processes and compare them to lower multiplicity processes. The…
Energy Growth in Scattering to Probe Higgs Cubic and HEFT Interactions
Shameran Mahmud, Kohsaku Tobioka
We compute the energy scales of perturbative unitarity violation in processes and compare them to process, where refers to a longitu…
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…
Light Dilaton in Rare Meson Decays and Extraction of its CP Property
Sudhakantha Girmohanta, Yuichiro Nakai, Yoshihiro Shigekami +1
The dilaton is a pseudo-Nambu-Goldstone boson associated with the spontaneous breaking of scale invariance in a nearly conformal theory, and couples to the trace of the stress-…
MeV Sterile Neutrino in light of the Cabibbo-Angle Anomaly
Teppei Kitahara, Kohsaku Tobioka
A modified neutrino sector could imprint a signature on precision measurements of the quark sector because many such measurements rely on the semi-leptonic decays of the charged cu…
Probing long-lived axions at the KOTO experiment
Yoav Afik, Babette Döbrich, Jan Jerhot +2
While the main goal of the J-PARC KOTO experiment is to measure the rare decay , the unique setup of KOTO raises the possibility to search for physics beyond t…
First Evaluation of Meson and lepton Spectra and Search for Heavy Neutral Leptons at ILC Beam Dump
Mihoko M. Nojiri, Yasuihito Sakaki, Kohsaku Tobioka +1
A beam dump experiment can be seamlessly added to the {proposed} International Linear Collider (ILC) program because the high energy electron beam should be dumped after the collis…
The International Linear Collider: Report to Snowmass 2021
Alexander Aryshev, Ties Behnke, Mikael Berggren +508
The International Linear Collider (ILC) is on the table now as a new global energy-frontier accelerator laboratory taking data in the 2030s. The ILC addresses key questions for our…
New Physics Searches at Kaon and Hyperon Factories
Evgueni Goudzovski, Diego Redigolo, Kohsaku Tobioka +61
Rare meson decays are among the most sensitive probes of both heavy and light new physics. Among them, new physics searches using kaons benefit from their small total decay widths…
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…
Feebly-Interacting Particles:FIPs 2020 Workshop Report
Prateek Agrawal, Martin Bauer, James Beacham +43
With the establishment and maturation of the experimental programs searching for new physics with sizeable couplings at the LHC, there is an increasing interest in the broader part…
Heavy QCD Axion in transition: Enhanced Limits and Projections
Sabyasachi Chakraborty, Manfred Kraus, Vazha Loladze +2
We study a "heavy" QCD axion whose coupling to the standard model is dominated by but with . This is well motivated as it can solve the str…
Light quark Yukawas in triboson final states
Adam Falkowski, Sanmay Ganguly, Phillippe Gras +4
Triple heavy vector boson production, , has recently been observed for the first time. We propose that precision measurements of this process provide an e…
A solar origin of the XENON1T excess without stellar cooling problems
Sabyasachi Chakraborty, Tae Hyun Jung, Vazha Loladze +2
Solar interpretations of the recent XENON1T excess events, such as axion or dark photon emissions from the sun, are thought to be at odds with stellar cooling bounds from the horiz…
KOTO vs. NA62 Dark Scalar Searches
Stefania Gori, Gilad Perez, Kohsaku Tobioka
The two kaon factories, KOTO and NA62, are at the cutting edge of the intensity frontier, with an unprecedented numbers of long lived and charged Kaons, ~ 10^{13}, being measured a…
Les Houches 2019 Physics at TeV Colliders: New Physics Working Group Report
G. Brooijmans, A. Buckley, S. Caron +87
This report presents the activities of the `New Physics' working group for the `Physics at TeV Colliders' workshop (Les Houches, France, 10--28 June, 2019). These activities includ…
New physics implications of recent search for at KOTO
Teppei Kitahara, Takemichi Okui, Gilad Perez +2
The KOTO experiment recently reported four candidate events in the signal region of search, where the standard model only expects events. If conf…
New Axion Searches at Flavor Factories
Xabier Cid Vidal, Alberto Mariotti, Diego Redigolo +2
We assess the impact of searches at flavor factories for new neutral resonances that couple to both photons and gluons. These are well motivated by "heavy axion" solutions of the s…
New LHC bound on low-mass diphoton resonances
Alberto Mariotti, Diego Redigolo, Filippo Sala +1
We derive a new bound on diphoton resonances using inclusive diphoton cross section measurements at the LHC, in the so-far poorly constrained mass range between the Upsilon and the…
Dynamics of Relaxed Inflation
Walter Tangarife, Kohsaku Tobioka, Lorenzo Ubaldi +1
The cosmological relaxation of the electroweak scale has been proposed as a mechanism to address the hierarchy problem of the Standard Model. A field, the relaxion, rolls down its…