Naturalness in D-brane inspired models

被引：2

作者：

De Benedetti, Ron ^{[1
]}

Li, Tianjun ^{[2
,3
]}

Maxin, James A. ^{[1
]}

Nanopoulos, Dimitri V. ^{[4
,5
,6
]}

机构：

[1] Louisiana State Univ, Dept Chem & Phys, Shreveport, LA 71115 USA

[2] Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, Beijing 100190, Peoples R China

[3] Univ Chinese Acad Sci, Sch Phys Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China

[4] Texas A&M Univ, George P & Cynthia W Mitchell Inst Fundamental Ph, College Stn, TX 77843 USA

[5] HARC, Astroparticle Phys Grp, Mitchell Campus, The Woodlands, TX 77381 USA

[6] Acad Athens, Div Nat Sci, 28 Panepistimiou Ave, Athens 10679, Greece

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2019年 / 2019卷 / 07期

基金：

中国国家自然科学基金;

关键词：

Supersymmetry Phenomenology; Strings and branes phenomenology; FLIPPED SU(5); SCALE;

D O I：

10.1007/JHEP07(2019)048

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

We examine the naturalness of the D-brane inspired model constructed in flipped SU(5) supplemented with vector-like particles at the TeV scale, dubbed flippons. We find the model can produce a mainly Higgsino-like lightest supersymmetric particle (LSP) and small light stops, as favored by naturalness. In fact, a large trilinear scalar A(t) term at the electroweak (EW) scale creates a large mass splitting between the top squarks, driving the light stop to near degeneracy with an LSP that is almost all Higgsino, with Delta M thus far. Given the smallness of the light stop, generating a 125 GeV light Higgs boson mass is aided by one-loop contributions from the Yukawa couplings between the flippons and Higgs fields. The resulting parameter space satisfying naturalness is rather constrained, thus we assess its viability by means of comparison to the LHC constraint on soft charm jets and direction detection limits on spin-independent cross-sections. Finally, we compute the level of electroweak fine-tuning and uncover a region with Delta(EW)< 30, i.e., fine-tuning better than 3%, regarded as low electroweak fine-tuning. Given the small light stop, the electroweak fine-tuning from only the top squarks is of O(1), indicating no fine-tuning from neither the light stop <(t)over tilde>2.

引用

页数：21

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