Very light axion
نویسندگان
چکیده
منابع مشابه
Very Light Axion
Here, the question arises, “Why is |θ̄| so small?”, which is the parameter problem in the standard model. It is commonly called the strong CP problem. Most small parameters in physics have led to some ideas, mostly those related to symmetries. For example, the small ratio MW /MP ≪ 1 (the so-called gauge hierarchy problem) led to supersymmetric solution [3], and mu,md ≪ 1 GeV led to the chiral sy...
متن کاملOn the circular polarisation of light from axion-photon mixing
Abstract. From the analysis of measurements of the linear polarisation of visible light coming from quasars, the existence of large-scale coherent orientations of quasar polarisation vectors in some regions of the sky has been reported. Here, we show that this can be explained by the mixing of the incoming photons with nearly massless pseudoscalar (axion-like) particles in extragalactic magneti...
متن کاملLight Axion within the Next-to-Minimal Supersymmetric Standard Model
We analyze the Higgs sector in the Next-to-Minimal Supersymmetric Standard Model, emphasizing the possibility of a light CP-odd scalar (axion) in the spectrum. We compute the coupling of the Standard-Model-like Higgs boson to a pair of axions, and show that it can be large enough to modify the Higgs branching fractions, with a significant impact on the Higgs searches. We delineate the range of ...
متن کاملQCD Axion and Quintessential Axion
The axion solution of the strong CP problem is reviewed together with the other strong CP solutions. We also point out the quintessential axion(quintaxion) whose potential can be extremely flat due to the tiny ratio of the hidden sector quark mass and the intermediate hidden sector scale. The quintaxion candidates are supposed to be the string theory axions, the model independent or the model d...
متن کاملVery Light Gravitino Dark Matter * * *
It is certainly very attractive that two longstanding open questions -the origin of electroweak symmetry breaking -and the nature of the non-baryonic dark matter in the Universeseem to be on the verge of being answered simultaneously and presumably in a unified framework. LHC will give us the opportunity to start scratching the surface of this issue and, if we are lucky enough, to hint more cle...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Nuclear Physics B - Proceedings Supplements
سال: 1999
ISSN: 0920-5632
DOI: 10.1016/s0920-5632(98)00497-6