Sneutrino NLSP Scenarios in the NUHM with Gravitino Dark Matter

Ellis, John R.; Olive, Keith A.; Santoso, Yudi

doi:10.1088/1126-6708/2008/10/005

Article
Report number	arXiv:0807.3736 ; CERN-PH-TH-2008-159 ; UMN-TH-2708-08 ; FTPI-MINN-08-28 ; IPPP-08-53 ; DCPT-08-106 ; CERN-PH-TH-2008-159 ; DCPT-08-106 ; FTPI-MINN-08-28 ; IPPP-08-53 ; UMN-TH-2708-08
Title	Sneutrino NLSP Scenarios in the NUHM with Gravitino Dark Matter
Related title	NEXT LIGHTEST SUPERSYMMETRIC PARTICLE
Author(s)	Ellis, John R. (CERN) ; Olive, Keith A. (Minnesota U., Theor. Phys. Inst.) ; Santoso, Yudi (Durham U., IPPP)
Publication	2008
Imprint	24 Jul 2008
Number of pages	29
In:	JHEP 10 (2008) 005
DOI	10.1088/1126-6708/2008/10/005
Subject category	Particle Physics - Phenomenology
Abstract	We analyze scenarios in which some flavour of sneutrino is the next-to-lightest supersymmetric particle (NLSP), assuming that the gravitino is the lightest supersymmetric particle (LSP) and provides the cold dark matter. Such scenarios do not arise in the constrained supersymmetric extension of the Standard Model (CMSSM) with universal gaugino and scalar masses input at the GUT scale. However, models with non-universal Higgs masses (NUHM) do allow scenarios with a sneutrino NLSP, which are quite generic. We illustrate how such scenarios may arise, analyze the possible metastable sneutrino lifetime, and explore the theoretical, phenomenological, experimental and cosmological constraints on such scenarios. We also discuss the collider signatures of such scenarios, how they may be distinguished from neutralino LSP scenarios, and how different flavours of sneutrino NLSP may be distinguished.
Copyright/License	Open Access

$\it The sneutrino NLSP lifetime as a function of $\mgrav$ for $\msnu = 10, 100, 500$ and $1000$~GeV (top to bottom).$ $\it Sparticle masses as functions of $\mu$ for $\tan \beta = 10$, $m_{1/2} = 500$~GeV, $m_0 = 100$~GeV, $A_0 = 0$, $m_t = 172.6$~GeV, $m_b(m_b)^{\overline{\rm MS}} =4.25$~GeV, and $m_A =$ (a) 200~GeV, (b) 1000~GeV, (c) 1500~GeV and (d) 2000~GeV, respectively. In panels (c) and (d), the sparticle lines are truncated at larger $|\mu|$ where some sneutrino becomes tachyonic. Constraints are represented by vertical lines: black dotted for the GUT constraint (larger $|\mu|$ is excluded); red dot-dashed shows the Higgs mass contour at $m_h = 114.4$ GeV, while the constraint using the LEP likelihood function convolved with theoretical uncertainties in the Higgs mass (computed here using {\tt FeynHiggs} \cite{fh}) is shown by the red dashed line; the $(g-2)_\mu$ constraint (described in the text) is shown by the light blue long dashed lines; and solid green for the $b \to s \gamma$ constraint (smaller $\mu$is excluded).$ $\it Sparticle masses as functions of $\mu$ for $\tan \beta = 10$, $m_{1/2} = 500$~GeV, $m_0 = 100$~GeV, $A_0 = 0$, $m_t = 172.6$~GeV, $m_b(m_b)^{\overline{\rm MS}} =4.25$~GeV, and $m_A =$ (a) 200~GeV, (b) 1000~GeV, (c) 1500~GeV and (d) 2000~GeV, respectively. In panels (c) and (d), the sparticle lines are truncated at larger $|\mu|$ where some sneutrino becomes tachyonic. Constraints are represented by vertical lines: black dotted for the GUT constraint (larger $|\mu|$ is excluded); red dot-dashed shows the Higgs mass contour at $m_h = 114.4$ GeV, while the constraint using the LEP likelihood function convolved with theoretical uncertainties in the Higgs mass (computed here using {\tt FeynHiggs} \cite{fh}) is shown by the red dashed line; the $(g-2)_\mu$ constraint (described in the text) is shown by the light blue long dashed lines; and solid green for the $b \to s \gamma$ constraint (smaller $\mu$is excluded).$ Show more plots

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记录创建於2008-07-24，最後更新在2023-03-14

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