Stau relic density at the big-bang nucleosynthesis era in the coannihilation scenario and a solution to the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi>Li</mml:mi><mml:mprescripts /><mml:none /><mml:mn>7</mml:mn></mml:mmultiscripts></mml:math>problem

Jittoh, Toshifumi; Kohri, Kazunori; Koike, Masafumi; Sato, Joe; Shimomura, Takashi; Yamanaka, Masato

doi:10.1103/physrevd.82.115030

Cited by 25 publications

(19 citation statements)

References 42 publications

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“…Such long-lived staus will be copious during the BBN [50,51], we have shown in [29,33,38] that their presence indeed alters the prediction of the standard BBN and possibly solves the discrepancy of the lithium abundance in the Universe through the internal conversion reactions.…”

Section: Introductionmentioning

confidence: 80%

“…The light nuclei will interact not only with the CHAMPs during the BBN processes [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40], but also with the decay products of the CHAMPs in the post-BBN era [41][42][43][44][45][46][47][48]. The standard scenario of the BBN will thus be altered, and so is the abundance of the light elements at the present time.…”

Section: Introductionmentioning

confidence: 99%

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Big-bang nucleosynthesis with a long-lived charged massive particle includingHe4spallation processes

et al. 2011

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Section: Introductionmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Big-bang nucleosynthesis with a long-lived charged massive particle includingHe4spallation processes

et al. 2011

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“…This slepton can effectively destruct 7 Be which would be 7 Li just after the BBN era. Since at the BBN era would-be Li problem [29,30,32,[53][54][55][56][57][58][59][60][61]. In addition, several articles [27,62,63] report that there are significant amount of 6 Li though the standard BBN cannnot predict 6 Li abundance.…”

Section: B Big-bang Nucleosynthesismentioning

confidence: 99%

Big-bang nucleosynthesis and leptogenesis in the CMSSM

et al. 2018

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We have studied the constrained minimal supersymmetric standard model with three right-handed neutrinos, and investigated whether there still is a parameter region consistent with all experimental data/ limits such as the baryon asymmetry of the Universe, the dark matter abundance and the lithium primordial abundance. Using Casas-Ibarra parametrization, we have found a very narrow parameter space of the complex orthogonal matrix elements where the lightest slepton can have a long lifetime, which is necessary for solving the lithium problem. We have studied three cases of the right-handed neutrino mass ratioWe have obtained the mass range of the lightest right-handed neutrino that lies between 10 9 and 10 11 GeV. The important result is that its upper limit is derived by solving the lithium problem and the lower limit comes from leptogenesis. Lepton flavor violating decays such as μ → eγ in our scenario are in the reach of MEG-II and Mu3e.

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“…It has been discussed that such a scenario is favored in the context of solving the 7 Li problem [32].…”

Section: Mechanism Of Longevity Of Staumentioning

confidence: 99%

Identifying the origin of longevity of meta-stable stau at the LHC

2012

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In the framework of the supersymmetric standard model, the lighter stau often becomes long-lived. Such longevity of the stau is realized in three well-motivated scenarios: (A) the stau is the next-to-lightest supersymmetric particle (NLSP) and the gravitino is the lightest supersymmetric particle (LSP), (B) the stau is the LSP and R-parity is slightly violated, and (C) the stau is NLSP, the neutralino is the LSP, and the their masses are degenerate. We study the event topology and the decay of the stopping stau at the hadron calorimeter at the LHC, and show that it is possible to identify the reason why the stau becomes long-lived.

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Stau relic density at the big-bang nucleosynthesis era in the coannihilation scenario and a solution to theLi7problem

Cited by 25 publications

References 42 publications

Big-bang nucleosynthesis with a long-lived charged massive particle includingHe4spallation processes

Big-bang nucleosynthesis with a long-lived charged massive particle includingHe4spallation processes

Big-bang nucleosynthesis and leptogenesis in the CMSSM

Identifying the origin of longevity of meta-stable stau at the LHC

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