Naturalness and dark matter in a realistic intersecting D6-brane model

Ahmed, Waqas (0000000119573309, CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing, 100190, P.R. China) ; Calibbi, Lorenzo (0000000119573309, CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing, 100190, P.R. China) ; Li, Tianjun (0000000119573309, CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing, 100190, P.R. China) (0000 0004 1797 8419, School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, P.R. China) (0000 0004 0369 4060, School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu, 610054, P.R. China) ; Raza, Shabbar ( Department of Physics, Federal Urdu University of Arts, Science and Technology, Karachi, 75300, Pakistan) ; Niu, Jia-Shu (0000000119573309, CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing, 100190, P.R. China) (0000 0004 1797 8419, School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, P.R. China) ; Wang, Xiao-Chuan (0000 0004 0605 6769, Department of Physics, Henan Normal University, Xinxiang, Henan, 453007, P.R. China)

28 June 2018

Abstract: We revisit a three-family Pati-Salam model with a realistic phenomenology from intersecting D6-branes in Type IIA string theory compactified on a T 6 / (ℤ 2 × ℤ 2 ) orientifold, and study its naturalness in view of the current LHC and dark matter searches. We discuss spectrum and phenomenological features of this scenario demanding fine tuning better than 1%. This requirement restricts the lightest neutralino to have mass less than about 600 GeV. We observe that the viable parameter space is tightly constrained by the requirements of naturalness and consistency with the observed dark matter relic density, so that it is fully testable at current and future dark matter searches, unless a non-thermal production mechanism of dark matter is at work. We find that Z -resonance, h -resonance, A -funnel and light stau/stop-neutralino coannihilation solutions are consistent with current LHC and dark matter constraints while the “well-tempered” neutralino scenario is ruled out in our model. Moreover, we observe that only Bino, Higgsinos, right-handed staus and stops can have mass below 1 TeV.


Published in: JHEP 1806 (2018) 126
Published by: Springer/SISSA
DOI: 10.1007/JHEP06(2018)126
arXiv: 1711.10225
License: CC-BY-4.0



Back to search

Fulltext:
Download fulltextXML Download fulltextPDF (PDFA)