Supersymmetry: from the Fermi scale to the Planck scale

Recent developments in string duality suggest that the string scale may not be irrevocably tied to the Planck scale. Two explicit but unrealistic examples are described where the ratio of the string scale to the Planck scale is arbitrarily small. Solutions which are more realistic may exist in the intermediate coupling or "truly strong coupling" region of the heterotic string. Weak scale superstrings have dramatic experimental consequences for both collider physics and cosmology. 3/96 *

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“…They also exhibit new symmetries which naturally give a hierarchical structure to the Yukawa matrices. For recent reviews, see [24,25,26,27,28].…”

Section: The Success Of Weak Coupling Heterotic Modelsmentioning

confidence: 99%

Weak scale superstrings

1996

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“…In addition to the Dirac argument, magnetic monopoles arise naturally in field theories unifying the fundamental forces, like string theory [277,278,279] and Supersymmetric Grand Unified theories [280,281,282,283]. Although most of these theories tend to predict heavy monopoles, with masses higher than 10 15 GeV, there are some Grand Unified scenarios [284,285,286] in which mass values of the order of 10 4 GeV are allowed.…”

Section: A Direct Search For Stable Magnetic Monopolesmentioning

confidence: 99%

Review of searches for rare processes and physics beyond the Standard Model at HERA

South

Turcato

2016

Eur. Phys. J. C

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The electron-proton collisions collected by the H1 and ZEUS experiments at HERA comprise a unique particle physics data set, and a comprehensive range of measurements has been performed to provide new insight into the structure of the proton. The high centre of mass energy at HERA has also allowed rare processes to be studied, including the production of W and Z 0 bosons and events with multiple leptons in the final state. The data have also opened up a new domain to searches for physics beyond the Standard Model including contact interactions, leptoquarks, excited fermions and a number of supersymmetric models. This review presents a summary of such results, where the analyses reported correspond to an integrated luminosity of up to 1 fb −1 , representing the complete data set recorded by the H1 and ZEUS experiments.

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“…Looking for systems where symmetry is broken is an important issue in physics, in particular SUSY (Gel'fand and Likhtman, 1971, Wess and Zumino, 1974, Witten, 1981. This powerful new tool for physics between Fermi-and Planck-scales (Lopez, 1997) found applications at the Bohr-scale (Kostelecky, 1992, Cooper, 1993, Lévai, 1994, Roy and Varshni, 1991, Blado, 1996, Mukherjee et al, 1995, Guerin, 1996 and even in biology (Bahsford et al, 1998). SUSY uses algebraic quadratic superpotentials in the framework of quantum mechanics.…”

Section: Introductionmentioning

confidence: 99%