KEK素粒子原子核研究所・理論セミナー/Dr.Valentin V. Khoze

分類理論セミナー
開始2017/06/07(水)14:00
終了2017/06/07(水)15:00
会場Kenkyu Honkan 3F Seminar Room
講演タイトルHiggsplosion
講演者Dr.Valentin V. Khoze(Durham U., IPPP)
言語英語/English
連絡先倉知昌史/kurachi-AT-post.kek.jp
ウェブサイト
食堂・売店利用予定なし/0

概要


   
ABSTRACT

I will introduce and review the Higgsplosion phenomenon proposed in my recent work with Michael Spannowsky https://arxiv.org/pdf/1704.03447.pdf Higgsplosion occurs at some critical energy in the 10^2-10^3 TeV range and leads to an exponentially growing decay rate of highly energetic particles into multiple Higgs bosons. We argue that this a well-controlled non-perturbative phenomenon in the Higgs-sector which involves the final state Higgs multiplicities n in the regime nλ 1 where λ is the Higgs self-coupling. If this mechanism is realised in nature, the cross-sections for producing ultra-high multiplicities of Higgs bosons are likely to become observable and even dominant in this energy range. At the same time, however, the apparent exponential growth of these cross-sections at even higher energies will be tamed and automatically cut-off by a related Higgspersion mechanism. As a result, and in contrast to previous studies, multi-Higgs production does not violate perturbative unitarity. We then argue that the effects of Higgsplosion alter quantum corrections from very heavy states to the Higgs boson mass. Above a certain energy, which is much smaller than their masses, these states would rapidly decay into multiple Higgs bosons. The loop integrals contributing to the Higgs mass will be cut off not by the masses of the heavy states, but by the characteristic loop momenta where their decay widths become comparable to their masses. Hence, the cut-off scale would be many orders of magnitude lower than the heavy mass scales themselves, thus suppressing their quantum corrections to the Higgs boson mass.

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