A first evidence of the CMSSM is appearing soon

Konishi, Yasufumi; Ohta, Shingo; Sato, Joe; Shimomura, Takashi; Sugai, Kenichi; Yamanaka, Masato

doi:10.48550/arxiv.1309.2067

Cited by 7 publications

(15 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Indeed in large part of parameter space wherein the Higgs mass is consistent with the reported one, the mass difference between the neutralino and the stau is smaller than the mass of tau lepton[57,58,52]. Collider phenomenology in such parameter region is extensively studied[59,60,61,62,63,64,65].…”

mentioning

confidence: 83%

See 1 more Smart Citation

A solution to lithium problem by long-lived stau

Sato

Shimomura

Yamanaka

2017

Int. J. Mod. Phys. E

Self Cite

View full text Add to dashboard Cite

We review a non-standard Big-Bang Nucleosynthesis (BBN) scenario within the minimal supersymmetric standard model, and propose an idea to solve both 7 Li and 6 Li problems. Each problem is a discrepancy between the predicted abundance in the standard BBN and observed one. We focus on the stau, a supersymmetric partner of tau lepton, which is a long-lived charged particle when it is the next lightest supersymmetric particle and is degenerate in mass with the lightest supersymmetric particle. The long-lived stau forms a bound state with a nucleus, and provide non-standard nuclear reactions. One of those, the internal conversion process, accelerates the destruction of 7 Be and 7 Li, and leads to a solution to the 7 Li problem. On the other hand, the bound state of the stau and 4 He enhances productions of n, D, T, and 6 Li. The over-production of 6 Li could solve the 6 Li problem. While, the over-productions of D and T could conflict with observations, and the relevant parameter space of the stau is strictly constrained. We therefore need to carefully investigate the stau-4 He bound state to find a condition of solving the 6 Li problem. The scenario of the long-lived stau simultaneously and successfully fit the abundances of light elements (D, T, 3 He, 4 He, 6 Li, and 7 Li) and the neutralino dark matter to the observed ones. Consequently parameter space both of the stau and the neutralino is determined with excellent accuracy. *

show abstract

mentioning

confidence: 83%

“…Since at the BBN era would-be 7 Li exists as 7 Be, to destruct 7 Be effectively means to reduce 7 Li primordial abundance. This long-lived stau with the degenerate mass can offer the solution to 7 Li problem [22,26,50,33,51,52,53]. We review this idea in this article assuming exact tau number conservation.…”

Section: Introductionmentioning

confidence: 99%

A solution to lithium problem by long-lived stau

Sato

Shimomura

Yamanaka

2017

Int. J. Mod. Phys. E

Self Cite

View full text Add to dashboard Cite

show abstract

“…This timescale is important because the primordial 7 Li exists as beryllium-7 in the BBN era. The internal conversion processes (14) proceed much faster and thus 7 Be is very efficiently destroyed. We note that 7 Li from (14a) is also destroyed by background protons.…”

Section: Exotic Bbn Reactionsmentioning

confidence: 99%

“…Now that the mass of Higgs particle is determined, we are to examine whether it is compatible with our scenario. Our previous work analyzed the constrained minimal supersymmetric standard model [14]. There we found allowed regions in the parameter space, and presented phenomenological predictions such as mass spectra and branching ratios.…”

Section: Introductionmentioning

confidence: 95%

Big-bang nucleosynthesis through bound-state effects with a long-lived slepton in the NMSSM

et al. 2014

Self Cite

View full text Add to dashboard Cite

We show that the Li problems can be solved in the next-to-minimal supersymmetric standard model where the slepton as the next-to-lightest SUSY particle is very long-lived. Such a long-lived slepton induces exotic nuclear reactions in big-bang nucleosynthesis, and destroys and produces the 7 Li and 6 Li nuclei via bound state formation. We study cases where the lightest SUSY particle is singlino-like neutralino and bino-like neutralino to present allowed regions in the parameter space which is consistent with the observations on the dark matter and the Higgs mass.mass. We explore parameter space and discover parameter points that qualify the requirements. Special interest is in the case where the NMSSM singlet is the major component of the neutralino LSP in expectation of the difference from the MSSM. The case of bino-like neutralino is analyzed as well.This paper is organized as follows. In Sec. II, we introduce the NMSSM and define the model of our interest. The BBN in the presence of a long-lived slepton is also explained in this section. The exotic reactions that are absent from the standard BBN are introduced. Section III describes our strategy to find out the parameter point that are consistent with the three phenomenological clues. The results are presented in Sec. IV. We show the three benchmark cases characterized by the type of neutralino LSP. The first case considers singlinolike neutralinos. The couplings of the singlet is small and tan β is large in this case. The second case also handles singlino-like neutralinos, but the singlet couplings are large and tan β is small compared with the first case. The third case deals with bino-like neutralinos. Singlet couplings are set large and tan β small as in the second case. We show that each of these three cases allows the phenomenological constraints. We spot benchmark points in the parameter space and exhibit that they accord with the observations. The NMSSM parameters are calculated to confirm the adequate Higgs mass, and the BBN network calculation is carried out to check the relic abundance of light elements and of the LSP dark matter. The present work is summarized in Sec. V. II. THE NMSSM AND THE EXOTIC BBNWe recapitulate the Higgs and neutralino sectors, and explain exotic BBN processes with a long-lived slepton in the NMSSM. A. Higgs bosonsThe NMSSM specific part of the superpotential and the soft-breaking terms are−L NMSSM soft ⊃m 2 S |S| 2

show abstract

“…In such a region, the mass between LSP neutralino and next-LSP(NLSP) slepton degenerates, we are able to reduce the abundance of DM by an order or more orders of magnitude with a fixed value of DM mass. In addition, Lithium problem [7][8][9] can be solved if we admit lepton flavor violation [10][11][12][13][14][15]. For this reason Sommerfeld Enhancement [16][17][18][19] effect plays a crucial role in indirect DM observation experiments such as HESS experiment and Fermi-LAT experiment [20,21].…”

Section: Introductionmentioning

confidence: 99%

Sensitivity of indirect detection of Neutralino dark matter by Sommerfeld enhancement mechanism

Nagayama,

Sato,

Takanishi

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

We have investigated neutralino dark matter in the framework of minimal supersymmetric Standard Model focusing on the coannihilatioin region. In this region, where the particle whose mass is tightly degenerated with the neutralino dark matter exists, we can solve the Lithium problem in the case of lepton flavor being violated. It turns out that Sommerfeld enhancement is important in the coannihilation region so that the dark matter signal becomes large enough to be observed by the current sensitivity of indirect experiments.

show abstract

A first evidence of the CMSSM is appearing soon

Cited by 7 publications

References 49 publications

A solution to lithium problem by long-lived stau

A solution to lithium problem by long-lived stau

Big-bang nucleosynthesis through bound-state effects with a long-lived slepton in the NMSSM

Sensitivity of indirect detection of Neutralino dark matter by Sommerfeld enhancement mechanism

Contact Info

Product

Resources

About