Big-bang nucleosynthesis with a long-lived charged massive particle including 4He spallation processes in a bound state

Jittoh, Toshifumi; Kohri, Kazunori; Koike, Masafumi; Sato, Joe; Sugai, Kenichi; Yamanaka, Masato; Yazaki, K.

doi:10.1063/1.4742122

Cited by 2 publications

(2 citation statements)

References 78 publications

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“…Indeed, as recently pointed out in Ref. [86], the observed value of 7 Li can be reproduced if mτ 1 − mχ0 1 ≈ 0.1 GeV, without conflicting with the abundances of the rest of the light elements. Remarkably (see Fig.…”

Section: Long-lived Staus and Big Bang Nucleosynthesissupporting

confidence: 61%

A 119-125 GeV Higgs from a string derived slice of the CMSSM

Aparicio

Cerdeño

Ibáñez

2012

J. High Energ. Phys.

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The recent experimental hints for a relatively heavy Higgs with a mass in the range 119-125 GeV favour supersymmetric scenarios with a large mixing in the stop mass matrix. It has been shown that this is possible in the constrained Minimal Supersymmetric Standard Model (CMSSM), but only for a very specific relation between the trilinear parameter and the soft scalar mass, favouring A ~ -2m for a relatively light spectrum, and sizable values of tan(beta). We describe here a string-derived scheme in which the first condition is automatic and the second arises as a consequence of imposing radiative EW symmetry breaking and viable neutralino dark matter in agreement with WMAP constraints. More specifically, we consider modulus dominated SUSY-breaking in Type II string compactifications and show that it leads to a very predictive CMSSM-like scheme, with small departures due to background fluxes. Imposing the above constraints leaves only one free parameter, which corresponds to an overall scale. We show that in this construction $A=-3\sqrt{2}m\approx -2m$ and in the allowed parameter space tan(beta)=38-41, leading to 119 GeV < m_h < 125 GeV. We determine the detectability of this model and show that it could start being probed by the LHC at 7(8) TeV with a luminosity of 5(2) fb^-1, and the whole parameter space would be accessible for 14 TeV and 25 fb^-1. Furthermore, this scenario can host a long-lived stau with the right properties to lead to catalyzed BBN. We finally argue that anthropic arguments could favour the highest value for the Higgs mass that is compatible with neutralino dark matter, i.e., m_h~125 GeV.Comment: Effects of the new constraint on Bs->mu+mu- included. Final version to appear in JHEP. 45 pages, 14 figure

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Section: Long-lived Staus and Big Bang Nucleosynthesissupporting

confidence: 61%

A 119-125 GeV Higgs from a string derived slice of the CMSSM

Aparicio

Cerdeño

Ibáñez

2012

J. High Energ. Phys.

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“…3. The shaded regions are excluded for either destroying Helium-4, Lithium-7 and Deuterium or inducing a nuclear reaction that saturates the production of Deuterium is dissagreement with astronomical observations [27][28][29][30][31][32][33] .…”

Section: Bbn Constraintsmentioning

confidence: 92%

The Hubble constant troubled by dark matter in non-standard cosmologies

Alcaniz

Neto

Queiroz

et al. 2022

Sci Rep

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The Standard Cosmological Model has experienced tremendous success at reproducing observational data by assuming a universe dominated by a cosmological constant and dark matter in a flat geometry. However, several studies, based on local measurements, indicate that the universe is expanding too fast, in disagreement with the Cosmic Microwave Background. Taking into account combined data from CMB, Baryon Acoustic Oscillation, and type Ia Supernovae, we show that if the mechanism behind the production of dark matter particles has at least a small non-thermal origin, one can induce larger values of the Hubble rate $$H_0$$ H 0 , within the $$\Lambda$$ Λ CDM, to alleviate the trouble with $$H_0$$ H 0 . In the presence of non-standard cosmology, however, we can fully reconcile CMB and local measurements and reach $$H_0=70$$ H 0 = 70 –74 $${\text {km s}}^{-1}\,{\text {Mpc}}^{-1}$$ km s - 1 Mpc - 1 .

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Big-bang nucleosynthesis with a long-lived charged massive particle including 4He spallation processes in a bound state

Cited by 2 publications

References 78 publications

A 119-125 GeV Higgs from a string derived slice of the CMSSM

A 119-125 GeV Higgs from a string derived slice of the CMSSM

The Hubble constant troubled by dark matter in non-standard cosmologies

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