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High Energy Physics - Phenomenology

arXiv:2305.06592 (hep-ph)
[Submitted on 11 May 2023 (v1), last revised 31 May 2023 (this version, v2)]

Title:Vacuum stability and Q-ball formation in the Type II Seesaw model

Authors:Naoyuki Haba, Yasuhiro Shimizu, Toshifumi Yamada
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Abstract:We investigate vacuum stability and Q-ball formation in the Type II seesaw model by considering the effective potential for scalar fields, taking into account renormalization effects. We find that the quartic coupling for the triplet Higgs can vanish at a high energy scale, creating a flat direction where Q-ball formation can occur. If Q-balls are produced, they eventually decay into leptons via neutrino Yukawa couplings with the triplet Higgs. If this decay occurs above the electroweak scale, the leptogenesis scenario can work, and the baryon number is produced via the sphaleron effect. We show that there are parameter regions where the above scenario occurs, taking into account phenomenological constraints.
Comments: 12 pages, 2 figures, references, and discussions on experimental constraints added
Subjects: High Energy Physics - Phenomenology (hep-ph)
Cite as: arXiv:2305.06592 [hep-ph]
  (or arXiv:2305.06592v2 [hep-ph] for this version)
  https://doi.org/10.48550/arXiv.2305.06592

Submission history

From: Yasuhiro Shimizu [view email]
[v1] Thu, 11 May 2023 06:11:59 UTC (377 KB)
[v2] Wed, 31 May 2023 12:45:16 UTC (136 KB)
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