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2023 年度 実施状況報告書

Multilegged amplitudes: from CFT to Higgs production at future colliders

研究課題

研究課題/領域番号 23K19047
研究機関東京大学

研究代表者

Bersini Jahmall.Matteo  東京大学, カブリ数物連携宇宙研究機構, 特任研究員 (50976389)

研究期間 (年度) 2023-08-31 – 2025-03-31
キーワードConformal field theory / Large charge expansion / Multi-Higgs production / Semiclassical methods
研究実績の概要

In line with the research plan, my work focused on bridging the semiclassical large charge framework and particle physics applications. As the first step, I worked on employing the large charge expansion to compute the anomalous dimensions of composite operators made out of Higgs fields in the Standard Model of particle physics. These operators can appear as effective vertices in high-energy processes involving many Higgs bosons and, therefore, may be important for understanding multiple Higgs production processes at the next generation of colliders. The results have been published in JHEP and presented in invited seminars at YITP, Kyoto (on 2024/03/28) and APCTP, Pohang (on 2024/03/08).

During this investigation, I encountered a so-far almost unexplored phase of the Standard Model characterized by W boson condensation and spatial anisotropy. I am currently investigating its properties which, intriguingly, substantially differ from the superfluid phase describing the large charge sector of all known CFTs. Moreover, this phase may be relevant for multiparticle production in gauge theories.

Finally, I worked on employing the large charge framework to study QCD-like theories at finite isospin charge near the lower end of the conformal window. The results show how the difference between the energy on the cylinder of the lightest charged state and the scaling dimension of the corresponding operator encodes the details of the conformality breaking. This research resulted in one preprint (2401.08457[hep-th]) which is currently under peer review.

現在までの達成度 (区分)
現在までの達成度 (区分)

2: おおむね順調に進展している

理由

Having been able to connect the large charge expansion framework with the Standard Model of particle physics represents considerable progress for the research project. At the same time, the development of an efficient semiclassical approach for the calculation of decay rates and cross sections with many bosons in the final state presents several challenges that are currently under investigation.

今後の研究の推進方策

I plan to continue working on the development of the large charge expansion framework with a focus on real-world applications.
As the next step, I will investigate the generalization of the approach to fermionic conformal theories. Moreover, I plan to unveil the novel anisotropic superfluid phase which describes the large charge sector of the Standard Model.

In parallel, I will keep trying to develop an efficient semiclassical framework to study multi-Higgs production processes at high energies.
At the moment, I am dealing with the expected technical challenges related to the intricate structure of the relevant saddle points. I plan to address these issues via a detailed analysis of the analytical properties of the saddle points and the related integration contours.

次年度使用額が生じた理由

I plan to spend the unused amount within the next four months on research visits to IRB (Zagreb) and SDU (Odense), where I will collaborate with Prof. Oleg Antipin and Prof. Francesco Sannino, respectively.

  • 研究成果

    (5件)

すべて 2024 その他

すべて 雑誌論文 (1件) (うち国際共著 1件、 査読あり 1件、 オープンアクセス 1件) 学会発表 (2件) 備考 (2件)

  • [雑誌論文] Infinite order results for charged sectors of the Standard Model2024

    • 著者名/発表者名
      Antipin Oleg、Bersini Jahmall、Panopoulos Pantelis、Sannino Francesco、Wang Zhi-Wei
    • 雑誌名

      Journal of High Energy Physics

      巻: 02 ページ: 168

    • DOI

      10.1007/JHEP02(2024)168

    • 査読あり / オープンアクセス / 国際共著
  • [学会発表] Perturbation theory meets large charge: from O(N) to the Standard Model of particle physics2024

    • 著者名/発表者名
      Jahmall Bersini
    • 学会等名
      YITP seminar
  • [学会発表] Perturbation theory meets large charge: from O(N) to the Standard Model of particle physics2024

    • 著者名/発表者名
      Jahmall Bersini
    • 学会等名
      APCTP seminar
  • [備考]

    • URL

      https://inspirehep.net/literature/2739253

  • [備考]

    • URL

      https://arxiv.org/abs/2401.08457

URL: 

公開日: 2024-12-25  

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