Nonthermal CP violation in soft leptogenesis

被引：5

作者：

Adhikari, Rathin ^{[1
]}

Dasgupta, Arnab ^{[1
]}

Fong, Chee Sheng ^{[2
]}

Rangarajan, Raghavan ^{[3
]}

机构：

[1] Cent Univ, Ctr Theoret Phys, Jamia Millia Islamia, New Delhi 110025, India

[2] Univ Sao Paulo, Inst Fis, BR-05315970 Sao Paulo, Brazil

[3] Phys Res Lab, Div Theoret Phys, Ahmadabad 380009, Gujarat, India

来源：

PHYSICAL REVIEW D | 2015年 / 91卷 / 09期

关键词：

LEPTON-FLAVOR VIOLATION; ELECTRIC-DIPOLE MOMENT; CLOSED-TIME-PATH; COSMOLOGICAL CONSTRAINTS; INFLATIONARY UNIVERSE; GRAVITINO PRODUCTION; SUPERSYMMETRY; BARYOGENESIS; TEMPERATURE; SEARCH;

D O I：

10.1103/PhysRevD.91.096001

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Soft leptogenesis is a mechanism which generates the matter-antimatter asymmetry of the Universe via the out-of-equilibrium decays of heavy sneutrinos in which soft supersymmetry breaking terms play two important roles: they provide the required CP violation and give rise to the mass splitting between otherwise degenerate sneutrino mass eigenstates within a single generation. This mechanism is interesting because it can be successful at the lower temperature regime T less than or similar to 10(9) GeV in which the conflict with the overproduction of gravitinos can possibly be avoided. In earlier works, the leading CP violation is found to be nonzero only if finite temperature effects are included. By considering generic soft trilinear couplings, we find two interesting consequences: (1) the leading CP violation can be nonzero even at zero temperature realizing nonthermal CP violation, and (2) the CP violation is sufficient even far away from the resonant regime allowing soft supersymmetry breaking parameters to assume natural values at around the TeV scale. We discuss phenomenological constraints on such scenarios and conclude that the contributions to charged lepton flavor violating processes are close to the sensitivities of present and future experiments.

引用

页数：14

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