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Title: Dark matter from late invisible decays to and of gravitinos

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Publication Date:
Sponsoring Org.:
OSTI Identifier:
Grant/Contract Number:
FG02-13ER42020; SC0010107
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 91; Journal Issue: 5; Related Information: CHORUS Timestamp: 2016-12-23 15:48:59; Journal ID: ISSN 1550-7998
American Physical Society
Country of Publication:
United States

Citation Formats

Allahverdi, Rouzbeh, Dutta, Bhaskar, Queiroz, Farinaldo S., Strigari, Louis E., and Wang, Mei-Yu. Dark matter from late invisible decays to and of gravitinos. United States: N. p., 2015. Web. doi:10.1103/PhysRevD.91.055033.
Allahverdi, Rouzbeh, Dutta, Bhaskar, Queiroz, Farinaldo S., Strigari, Louis E., & Wang, Mei-Yu. Dark matter from late invisible decays to and of gravitinos. United States. doi:10.1103/PhysRevD.91.055033.
Allahverdi, Rouzbeh, Dutta, Bhaskar, Queiroz, Farinaldo S., Strigari, Louis E., and Wang, Mei-Yu. 2015. "Dark matter from late invisible decays to and of gravitinos". United States. doi:10.1103/PhysRevD.91.055033.
title = {Dark matter from late invisible decays to and of gravitinos},
author = {Allahverdi, Rouzbeh and Dutta, Bhaskar and Queiroz, Farinaldo S. and Strigari, Louis E. and Wang, Mei-Yu},
abstractNote = {},
doi = {10.1103/PhysRevD.91.055033},
journal = {Physical Review D},
number = 5,
volume = 91,
place = {United States},
year = 2015,
month = 3

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1103/PhysRevD.91.055033

Citation Metrics:
Cited by: 8works
Citation information provided by
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  • The generation of dark matter in late decays of quasistable massive particles has been proposed as a viable framework to address the excess of power found in numerical N-body simulations for cold dark matter cosmologies. We identify a convenient set of variables to illustrate which requirements need to be satisfied in any generic particle-physics model to address the small-scale problems and to fulfill other astrophysical constraints. As a result of this model-independent analysis, we point out that meeting these requirements in a completely natural way is inherently difficult. In particular, we reexamine the role of gravitinos and Kaluza-Klein gravitons inmore » this context and find them disfavored as a solution to the small-scale problems in case they are dark matter candidates generated in the decay of thermally produced weakly interacting massive particles. We propose right-handed sneutrinos and right-handed Kaluza-Klein neutrinos as alternatives. We find that they are viable dark matter candidates, but that they can contribute to a solution of the small-scale problems only in case the associated Dirac neutrino mass term appears as a subdominant contribution in the neutrino mass matrix.« less
  • We examine in a model-independent manner the measurements that can be performed at B factories with sensitivity to dark matter. If a singlet scalar, pseudoscalar, or vector is present and mediates the standard model-dark matter interaction, it can mediate invisible decays of quarkonium states such as the {upsilon}, J/{psi}, and {eta}. Such scenarios have arisen in the context of supersymmetry, extended Higgs sectors, solutions of the supersymmetric {mu} problem, and extra U(1) gauge groups from grand unified theories and string theory. Existing B factories running at the {upsilon}(4S) can produce lower {upsilon} resonances by emitting an initial state radiation (ISR)more » photon. Using a combination of ISR and radiative decays, the initial state of an invisibly decaying quarkonium resonance can be tagged, giving sensitivity to the spin and CP nature of the particle that mediates standard model-dark matter interactions. These measurements can discover or place strong constraints on dark matter scenarios where the dark matter is approximately lighter than the b quark. For the decay chains {upsilon}(nS){yields}{pi}{sup +}{pi}{sup -}{upsilon}(1S) (n=2,3) we analyze the dominant backgrounds and determine that with 400 fb{sup -1} collected at the {upsilon}(4S), the B factories can limit BR({upsilon}(1S){yields}invisible) < or approx. 0.1%.« less
  • Invisible {psi} and {Upsilon} decays into light neutralinos, within the minimal or next-to-minimal supersymmetric standard model, are smaller than for {nu}{nu} production, even if light spin-0 particles are coupled to quarks and neutralinos. In a more general way, light dark matter particles are normally forbidden, unless they can annihilate sufficiently through a new interaction stronger than weak interactions (at lower energies), as induced by a light spin-1 U boson, or heavy-fermion exchanges in the case of scalar dark matter. We discuss the possible contributions of U-boson, heavy-fermion, or spin-0 exchanges to invisible {psi} and {Upsilon} decays. U exchanges could lead,more » but not necessarily, to significant branching fractions for invisible decays into light dark matter. We show how one can get the correct relic density together with sufficiently small invisible branching fractions, and the resulting constraints on the U couplings to ordinary particles and dark matter, in particular |c{sub {chi}fbV}|<5x10{sup -3} from {Upsilon} decays, for 2m{sub {chi}}smaller than a few GeV. We also explain why there is no model-independent way to predict {psi} and {Upsilon} branching fractions into light dark matter, from dark matter annihilation cross sections at freeze-out time.« less
  • The matter power spectrum at comoving scales of (1-40)h{sup -1} Mpc is very sensitive to the presence of Warm Dark Matter (WDM) particles with large free-streaming lengths. We present constraints on the mass of WDM particles from a combined analysis of the matter power spectrum inferred from the large samples of high-resolution high signal-to-noise Lyman-{alpha} forest data of Kim et al. (2004) and Croft et al. (2002) and the cosmic microwave background data of WMAP. We obtain a lower limit of m{sub WDM} > or approx. 550 eV (2{sigma}) for early decoupled thermal relics and m{sub WDM} > or approx.more » 2.0 keV (2{sigma}) for sterile neutrinos. We also investigate the case where in addition to cold dark matter a light thermal gravitino with fixed effective temperature contributes significantly to the matter density. In that case the gravitino density is proportional to its mass, and we find an upper limit m{sub 3/2} < or approx. 16 eV (2{sigma}). This translates into a bound on the scale of supersymmetry breaking, {lambda}{sub susy} < or approx. 260 TeV, for models of supersymmetric gauge mediation in which the gravitino is the lightest supersymmetric particle.« less