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BEGIN:VEVENT
SUMMARY:Seminar\, Takaya Iwai (岩井 喬也\, Osaka U.)
DTSTART;VALUE=DATE-TIME:20260423T043000Z
DTEND;VALUE=DATE-TIME:20260423T053000Z
UID:425404392041
DESCRIPTION:title: Excluding MeV-scale QCD axions by \nK\nL\n→\nπ\n0\n
 π\n0\na\nKL \\rightarrow \\pi^0 \\pi^0 a\nKL→π \n0\n π \n0\n a at KTe
 V\n\nabstract:\nAn interesting proposal suggests that a QCD axion (\na\na\
 na) coupling to the up quark\, down quark\, and electron remains viable fo
 r an axion mass near 10 MeV. In this paper\, this possibility is reexamine
 d by deriving new bounds from kaon decays. In particular\, we perform a de
 tailed analysis of the \nK\nL\n→\nπ\n0\nπ\n0\ne\n+\ne\n−\nKL \\right
 arrow \\pi^0 \\pi^0 e^+ e^-\nKL→π \n0\n π \n0\n e \n+\n e \n−\n  mea
 surement reported by the KTeV experiment\, and reinterpret \nK\n+\nK^+\nK 
 \n+\n  decay measurements at the E949 and NA62 experiments to constrain bo
 th the diphoton decay and effectively invisible decay modes of the axion. 
 \nWe find that\, combined with the previously known bounds\, the viable wi
 ndow for the MeV-scale QCD axion is excluded\, primarily due to the KTeV b
 ound. Uncertainties associated with the chiral Lagrangian are further exam
 ined\, and the scenario remains excluded even after accounting for these u
 ncertainties\, except for a tiny region of parameter space where higher-or
 der corrections must finely cancel the leading-order contribution\, suppre
 ssing the branching ratio of \nK\nL\n→\nπ\n0\nπ\n0\na\nKL \\rightarrow
  \\pi^0 \\pi^0 a\nKL→π \n0\n π \n0\n a by three orders of magnitude.
LOCATION:721
END:VEVENT
BEGIN:VEVENT
SUMMARY:Journal Club\, Kazuya Yonekura
DTSTART;VALUE=DATE-TIME:20260424T033000Z
DTEND;VALUE=DATE-TIME:20260424T043000Z
UID:160759319463
DESCRIPTION:Journal Club\, Kazuya Yonekura
LOCATION:721
END:VEVENT
BEGIN:VEVENT
SUMMARY:Seminar\, Fumihiro Naokawa (直川 史寛\, Tohoku U.)
DTSTART;VALUE=DATE-TIME:20260430T043000Z
DTEND;VALUE=DATE-TIME:20260430T053000Z
UID:188946311828
DESCRIPTION:Title : In the Era of Systematics-Limited Cosmology\nIn modern
  cosmology\, several observational “tensions” have emerged as major to
 pics of interest. From a theoretical perspective\, these tensions provide 
 intriguing hints of new physics beyond the standard framework. However\, t
 o make such discussions robust\, it is crucial to reduce observational unc
 ertainties as much as possible. Even when statistical errors are sufficien
 tly small for discrepancies to be considered “tensions\,” there always
  remains the possibility that they are driven by systematic errors. In thi
 s seminar\, I will introduce myself and research which I have been involve
 d in\, aiming to mitigate systematic errors of Hubble tension\, cosmic bir
 efringence\, and the optical depth.\n\ncf.\n\nF. Naokawa\, PRL 136\, 04100
 4\nY. Kageura\, M. Ouchi\, F. Naokawa et al. arXiv 2601.09644
LOCATION:721
END:VEVENT
BEGIN:VEVENT
SUMMARY:Seminar\, Kiyoharu Kawana (川名清晴\, KIAS)
DTSTART;VALUE=DATE-TIME:20260507T043000Z
DTEND;VALUE=DATE-TIME:20260507T053000Z
UID:327658133040
DESCRIPTION:Title: Effective field theories for higher-form global symmetr
 ies \n\nAbstract:\nIn this talk\, I explain the effective field theory fra
 mework for higher-form global symmetries. This framework can be viewed as 
 a generalization of the conventional Landau paradigm to higher-form global
  symmetries.  After outlining the general construction of  the theory\, I 
 discuss its mean-field analysis and show how it reproduces well-known resu
 lts on the spontaneous breaking of higher-form global symmetries. \nIf tim
 e permits\, I will also comment on the application to SU(N) gauge theory.
LOCATION:online
END:VEVENT
BEGIN:VEVENT
SUMMARY:Journal Club\, Hajime Furuta
DTSTART;VALUE=DATE-TIME:20260515T033000Z
DTEND;VALUE=DATE-TIME:20260515T043000Z
UID:255806477526
DESCRIPTION:Journal Club\, Hajime Furuta
LOCATION:721
END:VEVENT
END:VCALENDAR