Bounds on long-lived charged massive particles from Big Bang nucleosynthesis

Jedamzik, Karsten

doi:10.1088/1475-7516/2008/03/008

Cited by 83 publications

(93 citation statements)

References 28 publications

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“…3. The even more conservative c max curves obtained for τ e l1 ≤ 10 4 s are presented to cover also the case of a more relaxed CBBN constraint which could result, for example, from 6 Li/H| p ≤ 2.7 × 10 −10 [53], i.e., an upper limit that is about an order of magnitude more generous than (16). This emphasizes the conservative character of the corresponding c max curves shown in Fig.…”

Section: Probing Tr By Measuring the Gluino-slepton Mass Ratiomentioning

confidence: 76%

Probing the reheating temperature at colliders and with primordial nucleosynthesis

Steffen¹

2008

Physics Letters B

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Considering gravitino dark matter scenarios with a long-lived charged slepton, we show that collider measurements of the slepton mass and its lifetime can probe not only the gravitino mass but also the post-inflationary reheating temperature TR. In a model independent way, we derive upper limits on TR and discuss them in light of the constraints from the primordial catalysis of 6 Li through bound-state effects. In the collider-friendly region of slepton masses below 1 TeV, the obtained conservative estimate of the maximum reheating temperature is about TR = 3×10 9 GeV for the limiting case of a small gluino-slepton mass splitting and about TR = 10 8 GeV for the case that is typical for universal soft supersymmetry breaking parameters at the scale of grand unification. We find that a determination of the gluino-slepton mass ratio at the Large Hadron Collider will test the possibility of TR > 10 9 GeV and thereby the viability of thermal leptogenesis with hierarchical heavy right-handed Majorana neutrinos.PACS numbers: 98.80. Cq, 95.35.+d, 12.60.Jv, 95.30.Cq

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Section: Probing Tr By Measuring the Gluino-slepton Mass Ratiomentioning

confidence: 76%

Probing the reheating temperature at colliders and with primordial nucleosynthesis

Steffen¹

2008

Physics Letters B

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“…Indeed, as discussed in Ref. [29], for those branching ratios, the effect of CBBN on 6 Li is the dominant one in the region which is not already excluded by the D constraint. Thus, for m e l 1 1.5 TeV, our obtained limits on 6 Li overproduction are only marginally affected by the hadronic energy release of l 1 -decays.…”

Section: Implications For Supersymmetric Modelsmentioning

confidence: 84%

“…However, only in the last two years after the appearance of Ref. [12], a lot of work has been done [15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33] in order to refine various aspects of catalysis and to understand the implications of CBBN in the framework of specific models. The significant interest in CBBN is also fuelled by its direct connection with collider physics.…”

Section: Introductionmentioning

confidence: 99%

Constraints on supersymmetric models from catalytic primordial nucleosynthesis of beryllium

Pospelov

Pradler²,

Steffen³

2008

J. Cosmol. Astropart. Phys.

139

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The catalysis of nuclear reactions by negatively charged relics leads to increased outputs of primordial 6 Li and 9 Be. In combination with observational constraints on the primordial fractions of 6 Li and 9 Be, this imposes strong restrictions on the primordial abundance and the lifetime of charged relics. We analyze the constraints from the catalysis of 9 Be on supersymmetric models in which the gravitino is the lightest supersymmetric particle and a charged slepton-such as the lighter stau-the next-to-lightest supersymmetric particle (NLSP). Barring the special cases in which the primordial fraction of the slepton NLSP is significantly depleted, we find that the 9 Be data require a slepton NLSP lifetime of less than 6 × 10 3 s. We also address the issue of the catalytic destruction of 6 Li and 9 Be by late forming bound states of protons with negatively charged relics finding that it does not lead to any significant modification of the limit on the slepton lifetime.

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“…Bound state formation can also alter the rates for nuclear reactions, for example by lowering the coulomb barrier [36]. A comprehensive study of the constraints on long-lived charged particles was performed in [37], which includes the effects of both bound state formation and energetic particle injection. In this work, constraints are given for particle masses of 100 GeV and 1 TeV for a variety of hadronic branching fractions.…”

Section: Big Bang Nucleosynthesismentioning

confidence: 99%

The new look pMSSM with neutralino and gravitino LSPs

et al. 2012

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The pMSSM provides a broad perspective on SUSY phenomenology. In this paper we generate two new, very large, sets of pMSSM models with sparticle masses extending up to 4 TeV, where the lightest supersymmetric particle (LSP) is either a neutralino or gravitino. The existence of a gravitino LSP necessitates a detailed study of its cosmological effects and we find that Big Bang Nucleosynthesis places strong constraints on this scenario. Both sets are subjected to a global set of theoretical, observational and experimental constraints resulting in a sample of ∼ 225k viable models for each LSP type. The characteristics of these two model sets are briefly compared. We confront the neutralino LSP model set with searches for SUSY at the 7 TeV LHC using both the missing (MET) and non-missing E T ATLAS analyses. In the MET case, we employ Monte Carlo estimates of the ratios of the SM backgrounds at 7 and 8 TeV to rescale the 7 TeV data-driven ATLAS backgrounds to 8 TeV. This allows us to determine the pMSSM parameter space coverage for this collision energy. We find that an integrated luminosity of ∼ 5 − 20 fb −1 at 8 TeV would yield a substantial increase in this coverage compared to that at 7 TeV and can probe roughly half of the model set. If the pMSSM is not discovered during the 8 TeV run, then our model set will be essentially void of gluinos and lightest first and second generation squarks that are < ∼ 700 − 800 GeV, which is much less than the analogous mSUGRA bound. Finally, we demonstrate that non-MET SUSY searches continue to play an important role in exploring the pMSSM parameter space. These two pMSSM model sets can be used as the basis for investigations for years to come.

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Bounds on long-lived charged massive particles from Big Bang nucleosynthesis

Cited by 83 publications

References 28 publications

Probing the reheating temperature at colliders and with primordial nucleosynthesis

Probing the reheating temperature at colliders and with primordial nucleosynthesis

Constraints on supersymmetric models from catalytic primordial nucleosynthesis of beryllium

The new look pMSSM with neutralino and gravitino LSPs

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