PAMELA positron excess as a signal from the hidden sector

Feldman, Daniel; Liu, Zuowei; Nath, Pran

doi:10.1103/physrevd.79.063509

Cited by 177 publications

(188 citation statements)

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“…We remark also that when the DM annihilation process occurs close to the Higgs resonance, the Breit-Wigner enhancement mechanism is operative [40,41], resulting in a large boost of the annihilation cross section today, w.r.t. its freeze-out value.…”

Section: Jhep07(2012)015mentioning

confidence: 99%

Composite scalar dark matter

Frigerio

Pomarol

Riva

et al. 2012

J. High Energ. Phys.

155

227

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We show that the dark matter (DM) could be a light composite scalar η, emerging from a TeV-scale strongly-coupled sector as a pseudo Nambu-Goldstone boson (pNGB). Such state arises naturally in scenarios where the Higgs is also a composite pNGB, as in O(6)/O(5) models, which are particularly predictive, since the low-energy interactions of η are determined by symmetry considerations. We identify the region of parameters where η has the required DM relic density, satisfying at the same time the constraints from Higgs searches at the LHC, as well as DM direct searches. Compositeness, in addition to justify the lightness of the scalars, can enhance the DM scattering rates and lead to an excellent discovery prospect for the near future. For a Higgs mass m h 125 GeV and a pNGB characteristic scale f 1 TeV, we find that the DM mass is either m η 50−70 GeV, with DM annihilations driven by the Higgs resonance, or in the range 100−500 GeV, where the DM derivative interaction with the Higgs becomes dominant. In the former case the invisible Higgs decay to two DM particles could weaken the LHC Higgs signal.

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Section: Jhep07(2012)015mentioning

confidence: 99%

Composite scalar dark matter

Frigerio

Pomarol

Riva

et al. 2012

J. High Energ. Phys.

155

227

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“…[46,37]). On the other hand, dark matter annihilations which have a significant direct production of positrons through a pole [44] can simultaneously explain the PAMELA data as well as the WMAP data. For models which directly produce leptons, the high energy flux can be fit within the confines of the current experimental data (see [44] and [45] ).…”

Section: Connecting Pamela and The Lhcmentioning

confidence: 81%

“…On the other hand, dark matter annihilations which have a significant direct production of positrons through a pole [44] can simultaneously explain the PAMELA data as well as the WMAP data. For models which directly produce leptons, the high energy flux can be fit within the confines of the current experimental data (see [44] and [45] ). For the case of a Breit-Wigner enhancement in the galactic halo [44] the fits to both the fluxes and WMAP data are made possible due to the spreading of σv when integrating σv up to the freeze out temperature in the vicinity of the pole.…”

Section: Connecting Pamela and The Lhcmentioning

confidence: 81%

“…For models which directly produce leptons, the high energy flux can be fit within the confines of the current experimental data (see [44] and [45] ). For the case of a Breit-Wigner enhancement in the galactic halo [44] the fits to both the fluxes and WMAP data are made possible due to the spreading of σv when integrating σv up to the freeze out temperature in the vicinity of the pole. This may hint at a very narrow Z ′ which cou-ples with hypercharge enhanced couplings to the SM fermions, and couples vectorially through a Stueckelberg field to a dark dirac fermion [47].…”

Section: Connecting Pamela and The Lhcmentioning

confidence: 99%

“…A discovery of this type of Z ′ at the Tevatron and/or LHC in the dilepton channel may point us to a dark dirac fermion with mass that is slightly larger than M Z ′ /2 and thus lend further support for this distinct possibility of leptonic annihilations in the halo [47,44].…”

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confidence: 99%

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Superparticle Signatures: from PAMELA to the LHC

Feldman

2010

Nuclear Physics B - Proceedings Supplements

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Signatures of soft supersymmetry breaking at the CERN LHC and in dark matter experiments are discussed with focus drawn to light superparticles, and in particular light gauginos and their discovery prospects. Connected to the above is the recent PAMELA positron anomaly and its implications for signatures of SUSY in early runs at the Large Hadron Collider. Other new possibilities for physics beyond the Standard Model are also briefly discussed. Dual Probes of SUSYWe review here testable predictions of high scale models with universal and non universal soft [supersymmetry] 1 breaking within the framework of applied supergravity (SUGRA) and effective models of string theories with D-branes supporting chiral gauge theories (for recent related reviews see [2,3]). Common to all these models are the ingredients needed for working in the predictive SUGRA framework, namely: (a) an effective Kähler metric which generally depends on moduli, (b) a gauge kinetic function also dependent on such scalars, and (c) a superpotential comprised of visible and hidden sector fields and a bilinear term for the Higgses.An important set of predictions of the models discussed here is that they can offer the possibility of a relatively light gluino and electroweak gauginos with dark matter which is naturally Majorana. Thus the confluence of LHC signatures and signatures of dark matter play a central role in understanding the predictions of the above models. This connection is illuminated through knowledge of the possible sparticle mass hierarchies that can arise [4]. These mass hierarchies include the possibility of light scalars. However, naturalness/radiative electroweak symmetry breaking (REWSB) tend to point us to light gauginos and heavy squarks which generally occur on the upper Hyperbolic Branch (HB) of REWSB [6] often re-1 For recent clear reviews see [1] ferred to as the focus point (FP) region. This region naturally arises in the minimal supergravity framework [7] and its extensions which are typically perturbations around universality.Towards the end of this overview we will further discuss the connection between dark matter and the LHC, but more specifically in terms of the link between the WMAP data and the recent PAMELA positron excess [8]. Should the PAMELA anomaly be attributed to SUSY dark matter, the eigen-composition of the LSP plays a very relevant role. In addition, the composition of the LSP has important implications for collider signatures, and thus a direct bearing on the discovery prospects of SUSY at LHC, as well as the very nature of how dark matter was produced in the early universe. Resolving the Sparticle LandscapeWe begin with the Sparticle Landscape [4]. Of the 32 massive particles predicted in the MSSM, the number of ways in which the sparticle masses can stack up in their mass hierarchy is a priori undetermined unless an underlying framework is specified. Thus, if the 32 masses are treated as essentially all independent, then aside from sum rules on the Higgs, sfermions, and gaugino masses, and without im...

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Supersymmetry after the Higgs

Nath

2015

Annalen der Physik

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A brief review is given of the implications of a 126 GeV Higgs boson for the discovery of supersymmetry. Thus a 126 GeV Higgs boson is problematic within the Standard Model because of vacuum instability pointing to new physics beyond the Standard Model. The problem of vacuum stability is overcome in the SUGRA GUT model but the 126 GeV Higgs mass implies that the average SUSY scale lies in the several TeV region. The largeness of the SUSY scale relieves the tension on SUGRA models since it helps suppress flavor changing neutral currents and CP violating effects and also helps in extending the proton life time arising from baryon and lepton number violating dimension five operators. The geometry of radiative breaking of the electroweak symmetry and fine tuning in view of the large SUSY scale are analyzed.Consistency with the Brookhaven g μ − 2 result is discussed. It is also shown that a large SUSY scale implied by the 126 GeV Higgs boson mass allows for light gauginos (gluino, charginos, neutralinos) and sleptons. These along with the lighter third generation squarks are the prime candidates for discovery at RUN II of the LHC. Implication of the 126 GeV Higgs boson for the direct search for dark matter is discussed. Also discussed are the sparticles mass hierarchies and their relationship with the simplified models under the Higgs boson mass constraint.In 2012 the Large Hadron Collider (LHC) made a landmark discovery of a new boson. Thus the CMS and AT-LAS collaborations discovered a boson with a mass of ∼126 GeV [1][2][3][4]. It is now confirmed that this newly discovered particle is the long sought after Higgs boson [5][6][7][8] which plays a central role in the breaking of the electroweak symmetry. While the observed particle is the last missing piece of the Standard Model there are strong indications that at the same time its discovery portends discovery of a new realm of physics specifically supersymmetry. Below we elaborate on this theme in further detail.The outline of the rest of the paper is as follows: In Section 1 we discuss the status of the Higgs boson in the Standard Model, the issue of vacuum instability and the need for new physics beyond the Standard Model. In Section 2 we consider the implications of a 126 GeV Higgs boson within the framework of supersymmetry and specifically in the framework of supergravity unified models. As is well known a 126 GeV Higgs boson within supersymmetry leads to a high SUSY scale M s with M s lying in the TeV region. On the other hand the Brookhaven g μ − 2 experiment [9] shows a 3σ deviation from the Standard Model prediction [10,11]. An effect of this size requires that the average scale of sparticle masses entering the loops in the supersymmetric electroweak correction to g μ − 2 be low, i..e, O(100) GeV. Assuming the 3σ effect is robust we discuss in Section 3 how to reconcile the high SUSY scale that is indicated by the 126 GeV Higgs boson mass with the low SUSY scale indicated by the Brookhaven experiment. In Section 4 we discuss the implications of the Higgs ...

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PAMELA positron excess as a signal from the hidden sector

Cited by 177 publications

References 60 publications

Composite scalar dark matter

Composite scalar dark matter

Superparticle Signatures: from PAMELA to the LHC

Supersymmetry after the Higgs

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