Butsuri
Online ISSN : 2423-8872
Print ISSN : 0029-0181
ISSN-L : 0029-0181
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Volume 80, Issue 4
Displaying 1-24 of 24 articles from this issue
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Preface
Contents
Overview Articles
  • Anomaly in Bottom-Flavored Physics―What is Known and Unknown 10 Years after the First Announcement
    Syuhei Iguro
    Article type: Overview Articles
    2025 Volume 80 Issue 4 Pages 166-174
    Published: April 05, 2025
    Released on J-STAGE: April 06, 2025
    DOIhttps://doi.org/10.11316/butsuri.80.4_166
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    Large discrepancies in bottom-flavored physics have motivated intensive phenomenological studies for more than ten years. 3–4σ discrepancies between the experimental value and the prediction of the Standard Model (SM) of particle physics in b→cτν and b→sll transitions would imply new particles at TeV scale. In this commentary, we summarize the progress of these 10 years in the SM prediction and new physics interpretation of these hints. We discussed how to find the smoking gun signals of those particles in other bottomquark flavored observables, the large hadron collider, and electric dipole moments. We see that near future data will judge the interpretations by physics beyond the SM.

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Researches
  • Origin of Diverse 1/f Fluctuations―Amplitude Modulation and Demodulation
    Masahiro Morikawa, Akika Nakamichi
    Article type: Researches
    2025 Volume 80 Issue 4 Pages 175-180
    Published: April 05, 2025
    Released on J-STAGE: April 06, 2025
    DOIhttps://doi.org/10.11316/butsuri.80.4_175
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    The origin of diverse 1/f fluctuations is identified as a process of amplitude modulation and demodulation. Specifically, a large number of waves with systematically accumulating frequencies interfere with each other to generate beats that modulate signals in the low-frequency region. Synchronization, resonance, and infrared divergence are proposed as mechanisms for frequency accumulation. These modulated low-frequency signals emerge after various demodulation processes. To verify this explanation, we examine 1/f fluctuations observed in music, earthquakes, solar flares, and electric currents. The corresponding demodulation processes are, respectively, the data-squaring, fault rupture, magnetic reconnection, and the electric current as a square of the wave packet.

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  • High-Resolution X-Ray Spectroscopy of Muonic Atoms with Superconducting Transition-Edge Sensor Microcalorimeters
    Takuma Okumura, Shinji Okada, Toshiyuki Azuma
    Article type: Researches
    2025 Volume 80 Issue 4 Pages 181-186
    Published: April 05, 2025
    Released on J-STAGE: April 06, 2025
    DOIhttps://doi.org/10.11316/butsuri.80.4_181
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    Using an intense slow muon beam at J-PARC and superconducting X-ray microcalorimeters, we performed high-precision X-ray spectroscopy of muonic and electronic X-rays emitted from muonic atoms. A proof-of-principle experiment for a strong-field QED test with muonic atoms has been achieved by precisely measuring muonic X-rays emitted by muonic Ne. High-resolution measurements of electronic X-rays have also allowed us to observe muonic Ar with 1–3 bound electrons and to reveal the femtosecond dynamics in the formation process of muonic Fe.

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  • Two Unanticipated Discoveries in the Electron Gas―Excitonic Collective Mode and Excitron
    Yasutami Takada
    Article type: Researches
    2025 Volume 80 Issue 4 Pages 187-192
    Published: April 05, 2025
    Released on J-STAGE: April 06, 2025
    DOIhttps://doi.org/10.11316/butsuri.80.4_187
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    Based on a nonperturbative scheme to determine the self-energy with automatically satisfying the Ward identity and the total-momentum conservation law, a fully self-consistent calculation is done in the electron gas at various temperatures to obtain the one-electron spectral function to find a novel low-energy peak, dubbed excitron, in addition to the quasiparticle peak and one- and two-plasmon high-energy satellites. This excitron emerges due to the short-range electron-hole-pair multiple excitation, an incipient stage of the excitonic collective mode which was also discovered recently in the dynamic structure factor in the low-density electron gas.

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