2:1 for naturalness at the LHC?

被引：67

作者：

Arkani-Hamed, Nima ^{[1
]}

Blum, Kfir ^{[1
]}

D'Agnolo, Raffaele Tito ^{[2
,3
,4
]}

Fan, JiJi ^{[5
]}

机构：

[1] Inst Adv Study, Sch Nat Sci, Princeton, NJ 08540 USA

[2] Scuola Normale Super Pisa, Phys Ctr, I-56126 Pisa, Italy

[3] INFN, I-56126 Pisa, Italy

[4] European Org Nucl Res, CERN, CH-1217 Meyrin, Switzerland

[5] Princeton Univ, Dept Phys, Princeton, NJ 08540 USA

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2013年 / 01期

关键词：

Higgs Physics; Beyond Standard Model; P(P)OVER-BAR COLLISIONS; SPLIT SUPERSYMMETRY; SEARCH; SCALE;

D O I：

10.1007/JHEP01(2013)149

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：

A large enhancement of a factor of 1.5 - 2 in Higgs production and decay in the diphoton channel, with little deviation in the Z Z channel, can only plausibly arise from a loop of new charged particles with large couplings to the Higgs. We show that, allowing only new fermions with marginal interactions at the weak scale, the required Yukawa couplings for a factor of 2 enhancement are so large that the Higgs quartic coupling is pushed to large negative values in the UV, triggering an unacceptable vacuum instability far beneath the 10TeV scale. An enhancement by a factor of 1.5 can be accommodated if the charged particles are lighter than 150 GeV, within reach of discovery in almost all cases in the 8TeV run at the LHC, and in even the most difficult cases at 14TeV. Thus if the diphoton enhancement survives further scrutiny, and no charged particles beneath 150 GeV are found, there must be new bosons far beneath the 10TeV scale. This would unambiguously rule out a large class of fine-tuned theories for physics beyond the Standard Model, including split SUSY and many of its variants, and provide strong circumstantial evidence for a natural theory of electroweak symmetry breaking at the TeV scale. Alternately, theories with only a single fine-tuned Higgs and new fermions at the weak scale, with no additional scalars or gauge bosons up to a cutoff much larger than the 10TeV scale, unambiguously predict that the hints for a large diphoton enhancement in the current data will disappear.

引用

页数：19

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