Neutron Majorana mass from exotic instantons

被引：34

作者：

Addazi, Andrea ^{[1
,2
]}

Bianchi, Massimo ^{[3
]}

机构：

[1] Univ Aquila, Dipartimento Fis, I-67010 Coppito, AQ, Italy

[2] LNGS, I-67010 Assergi, AQ, Italy

[3] Univ Roma Tor Vergata, Dipartimento Fis, Ist Nazl Fis Nucl, Sez Roma Tor Vergata, I-00133 Rome, Italy

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2014年 / 12期

关键词：

Supersymmetry Phenomenology; Strings and branes phenomenology; SUPERSYMMETRIC STANDARD MODEL; GRAND UNIFIED THEORIES; ENERGY COSMIC-RAYS; GAUGE UNIFICATION; BARYON ASYMMETRY; STRING COMPACTIFICATIONS; STUECKELBERG EXTENSION; ANALYTIC CALCULATIONS; MINI-LANDSCAPE; CP-INVARIANCE;

D O I：

10.1007/JHEP12(2014)089

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 show how a Majorana mass for the neutron could result from nonperturbative quantum gravity effects peculiar to string theory. In particular, "exotic instantons" in un-oriented string compactifications with D-branes extending the (supersymmetric) standard model could indirectly produce an effective operator delta m n(t)n + h.c.. In a specific model with an extra vector-like pair of 'quarks', acquiring a large mass proportional to the string mass scale (exponentially suppressed by a function of the string moduli fields), delta m can turn out to be as low as 10(-24)-10(-25) eV. The induced neutron-antineutron oscillations could take place with a time scale tau(n (n) over tilde) > 10(8)s that could be tested by the next generation of experiments. On the other hand, proton decay and FCNC's are automatically strongly suppressed and are compatible with the current experimental limits. Depending on the number of brane intersections, the model may also lead to the generation of Majorana masses for R-handed neutrini. Our proposal could also suggest neutron-neutralino or neutron-axino oscillations, with implications in UCN, Dark Matter Direct Detection, UHECR and Neutron-Antineutron oscillations. This suggests to improve the limits on neutron-antineutron oscillations, as a possible test of string theory and quantum gravity.

引用

页数：36

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