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Discussing direct search of dark matter particles in the Minimal Supersymmetric extension of the Standard Model with light neutralinos
High Energy Physics - Phenomenology · Submitted 22 Nov 2010
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim Here we examine in detail all these new data and show that the present published results from the Tevatron and B-factories have only a mild effect on the original light neutralino population.
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We examine the status of light neutralinos in an effective Minimal Supersymmetric extension of the Standard Model (MSSM) at the electroweak scale which was considered in the past and discussed in terms of the available data of direct searches for dark matter (DM) particles. Our reanalysis is prompted by new measurements at the Tevatron and B-factories which might potentially provide significant constraints on the MSSM model. Here we examine in detail all these new data and show that the present published results from the Tevatron and B-factories have only a mild effect on the original light neutralino population. This population, which fits quite well the DAMA/LIBRA annual modulation data, would also agree with the preliminary results of CDMS, CoGeNT and CRESST, should these data, which are at present only hints or excesses of events over the expected backgrounds, be interpreted as authentic signals of DM. For the neutralino mass we find a lower bound of 7-8 GeV. Our results differ from some recent conclusions by other authors because of a few crucial points which we try to single out and elucidate.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We examine the status of light neutralinos in an effective Minimal Supersymmetric extension of the Standard Model (MSSM) at the electroweak scale which was considered in the past and discussed in terms of the available data of direct searches for dark matter (DM) particles. | contribution 0.51 | 0.49 | 0.05 | asserted 0.79 |
| s1 | Our reanalysis is prompted by new measurements at the Tevatron and B-factories which might potentially provide significant constraints on the MSSM model. | background 0.57 | 0.11 | 0.03 | speculative 0.52 |
| s2 | Here we examine in detail all these new data and show that the present published results from the Tevatron and B-factories have only a mild effect on the original light neutralino population. | result 0.89 | 0.87 | 0.59 | asserted 1.00 |
| s3 | This population, which fits quite well the DAMA/LIBRA annual modulation data, would also agree with the preliminary results of CDMS, CoGeNT and CRESST, should these data, which are at present only hints or excesses of events over the expected backgrounds, be interpreted as authentic signals of DM. | interpretation 0.65 | 0.48 | 0.22 | hedged possibility 0.90 |
| s4 | For the neutralino mass we find a lower bound of 7-8 GeV. | result 1.00 | 0.96 | 0.19 | asserted 1.00 |
| s5 | Our results differ from some recent conclusions by other authors because of a few crucial points which we try to single out and elucidate. | contribution 0.70 | 0.55 | 0.05 | asserted 0.96 |
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The paper
Original abstract
We examine the status of light neutralinos in an effective Minimal Supersymmetric extension of the Standard Model (MSSM) at the electroweak scale which was considered in the past and discussed in terms of the available data of direct searches for dark matter (DM) particles. Our reanalysis is prompted by new measurements at the Tevatron and B-factories which might potentially provide significant constraints on the MSSM model. Here we examine in detail all these new data and show that the present published results from the Tevatron and B-factories have only a mild effect on the original light neutralino population. This population, which fits quite well the DAMA/LIBRA annual modulation data, would also agree with the preliminary results of CDMS, CoGeNT and CRESST, should these data, which are at present only hints or excesses of events over the expected backgrounds, be interpreted as authentic signals of DM. For the neutralino mass we find a lower bound of 7-8 GeV. Our results differ from some recent conclusions by other authors because of a few crucial points which we try to single out and elucidate.
Human review
References
How the literature uses it
29 arXiv papers cite this in 95 sentences
Papers citing it · 65 sentences without a confident label
Builds on it 2 papers
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Notice that the present version of the LNM represents an extension of the model discussed in our previous papers [ref] , where a common squark and the slepton soft mass was employed for the 3 families.
Phenomenology of light neutralinos in view of recent results at the CERN Large Hadron Collider · Features of the Light Neutralino Model · 0.96
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Notice that the present version of this framework represents an extension of the model discussed in our previous papers [ref] , where a common squark and the slepton soft mass was employed for the 3 families.
Embedding the 125 GeV Higgs boson measured at the LHC in an effective MSSM: possible implications for neutralino dark matter · Effective MSSM · 1.00
Uses its method or tool 1 paper
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An approximate expression for $σ_scalar^(nucleon)$, valid at small values of $m_χ$, is obtained by including only the dominant contribution of the $h$ boson exchange [ref] :
Phenomenology of light neutralinos in view of recent results at the CERN Large Hadron Collider · Neutralino–nucleon elastic cross section · 0.86
Uses its data or values 3 papers
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Actually, by employing this procedure, in Ref. [ref] a value of 6–7 GeV for the lower limit of $m_χ$ was obtained, and this value was subsequently updated to the value of about 8 GeV in Refs. [ref] as derived from the experimental data available at that time.
Phenomenology of light neutralinos in view of recent results at the CERN Large Hadron Collider · The cosmological bound · 0.88
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We recall that this quantity is affected by large uncertainties [ref] with $(g_d,max/g_d,ref)^2 = 3.0$ and $(g_d,min/g_d,ref)^2 = 0.12$ [ref] .
Embedding the 125 GeV Higgs boson measured at the LHC in an effective MSSM: possible implications for neutralino dark matter · Effective MSSM · 0.81
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The following experimental constraints are imposed: accelerators data on supersymmetric and Higgs boson searches (CERN $e^+ e^-$ collider LEP2 [ref] , Collider Detectors D0 and CDF at Fermilab [ref] ); early bounds from Higgs searches at the LHC [ref] ; measurements of the $b →s + γ$ decay process [ref] : 2.89 $≤B(b →s + γ) ·10^4 ≤$ 4.21 is employed here (this interval is larger by 25% with respect to the experimental determination [ref] in order to take into account theoretical uncertainties in the supersymmetric (SUSY) contributions [ref] to the branching ratio of the process (for the SM calculation, we employ the recent NNLO results from Ref. [ref] )); the measurements of the muon anomalous magnetic moment $a_μ≡(g_μ - 2)/2$: for the deviation, $Δa_μ ≡a_μ^exp - a_μ^the$, of the experimental world average from the theoretical evaluation within the SM we use here the (2 $σ$) range $31 ≤Δ
Search at the CERN LHC for a light neutralino of cosmological interest · A model for light neutralinos (LNM) · 0.93
Compares with it 2 papers
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After taking into account the constraints considered in these works as well as $R_ℓ23$ and the LEP Higgs bounds in the way explained in section [ref], we find a lower limit for the neutralino mass, $m_χ̃^0_1≳8$ GeV, which is consistent with the results of Ref. [ref] .
Light Neutralino in the MSSM: a playground for dark matter, flavor physics and collider experiments · Summary and conclusion · 0.99
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By requiring $$ to be within the $2σ$ range, we find $5$, which is indeed consistent with the results previously obtained in [ref] .
Is light neutralino as dark matter still viable? · Results in the MSSM · 0.92
Cites it as support 3 papers
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This requires the CP-odd Higgs to be as light as $m_A ∼100$ GeV and a somewhat large value of $tanβ$ [ref] .
Light Neutralino in the MSSM: a playground for dark matter, flavor physics and collider experiments · Constraints to light neutralino dark matter scenarios · 0.96
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As pointed out in Ref. [ref] , scenario I arises naturally in the supersymmetric scheme considered in Refs. [ref] , when $m_h$ is taken as light as possible (compatibly with the mentioned LEP bound).
Embedding the 125 GeV Higgs boson measured at the LHC in an effective MSSM: possible implications for neutralino dark matter · Introduction · 0.96
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Our model is also compatible with all experimental searches for indirect evidence of SUSY and with precision data that set constraints on possible effects due to supersymmetry, as discussed in detail in Ref. [ref] (for the compatibility of very light neutralino masses with various laboratory bounds see also Ref. [ref] ).
Search at the CERN LHC for a light neutralino of cosmological interest · Introduction · 0.99
Cites it as background 11 papers
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In the present section we essentially recall the main properties of the light neutralinos within the LNM, as derived in Refs. [ref] , and which are relevant for the discussion of the experimental results of Refs. [ref] .
Observations of annual modulation in direct detection of relic particles and light neutralinos · Main features of the LNM · 0.99
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The phenomenology of light neutralinos has been thoroughly discussed in Refs. [ref] within an effective Minimal Supersymmetric extension of the Standard Model (MSSM) at the electroweak (EW) scale, where the usual hypothesis of gaugino–mass universality at the scale of Grand Unification (GUT) of the SUGRA models is removed (this model containing neutralinos of mass $m_χ$ 50 GeV was dubbed Light Neutralino Model (LNM) [ref] ); this denomination will also be maintained here).
Phenomenology of light neutralinos in view of recent results at the CERN Large Hadron Collider · Introduction · 0.96
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This question has been recently addressed by several collaborations [ref] (for previous works on light neutralinos, see [ref] ).
Light Neutralino in the MSSM: a playground for dark matter, flavor physics and collider experiments · Introduction · 0.84
What it cites · 104 sentences without a confident label
Contests 9 papers
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We finally note that the strict bounds obtained in Ref. [ref] on the WIMP–nucleon scattering cross–section are mainly due to: a) the use of constraints on $tanβ$ derived from D0–Collaboration [ref] and CDF [ref] data which were subsequently superseded (and relaxed) by Refs. [ref] , respectively; b) the implementation of bounds restrictively derived from B–meson decays data which suffer from sizable uncertainties and which have been in part superseded by the more recent measurements quoted above.
Search for Neutral Higgs Boson Production in the Decay h to tau(mu) tau with the D0 Detector · $B →τν$ and $B →D + τ+ ν$ at Belle and BaBar · contest 0.85
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We finally note that the strict bounds obtained in Ref. [ref] on the WIMP–nucleon scattering cross–section are mainly due to: a) the use of constraints on $tanβ$ derived from D0–Collaboration [ref] and CDF [ref] data which were subsequently superseded (and relaxed) by Refs. [ref] , respectively; b) the implementation of bounds restrictively derived from B–meson decays data which suffer from sizable uncertainties and which have been in part superseded by the more recent measurements quoted above.
Search for Higgs bosons predicted in two-Higgs-doublet models via decays to tau lepton pairs in 1.96 TeV proton-antiproton collisions · $B →τν$ and $B →D + τ+ ν$ at Belle and BaBar · contest 0.85
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We finally note that the strict bounds obtained in Ref. [ref] on the WIMP–nucleon scattering cross–section are mainly due to: a) the use of constraints on $tanβ$ derived from D0–Collaboration [ref] and CDF [ref] data which were subsequently superseded (and relaxed) by Refs. [ref] , respectively; b) the implementation of bounds restrictively derived from B–meson decays data which suffer from sizable uncertainties and which have been in part superseded by the more recent measurements quoted above.
Search for neutral MSSM Higgs bosons decaying to tau pairs in p-pbar collisions at sqrt(s)=1.96 TeV · $B →τν$ and $B →D + τ+ ν$ at Belle and BaBar · contest 0.85
Uses the method or tool of 6 papers
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The cross–section $σ_scalar^(nucleon)$ is calculated with its complete expression given in Ref. [ref] at a fixed reference set of values for the hadronic quantities involved in the neutralino-nucleon cross–sections [ref] (the dominant coupling $g_d$ is put at the value $g_d,ref$ = 290 MeV mentioned in Sect.
Interpreting the recent results on direct search for dark matter particles in terms of relic neutralino · Confronting results from experiments of direct detection of DM particles · 0.91
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The cross–section $σ_scalar^(nucleon)$ is calculated with its complete expression given in Ref. [ref] at a fixed reference set of values for the hadronic quantities involved in the neutralino-nucleon cross–sections [ref] (the dominant coupling $g_d$ is put at the value $g_d,ref$ = 290 MeV mentioned in Sect.
Neutralino properties in the light of a further indication of an annual modulation effect in WIMP direct search · Confronting results from experiments of direct detection of DM particles · 0.91
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Fig. [ref] and Fig. [ref] display the scatter plot for the quantity $R(D)$ evaluated by using the Eq. (9) of Ref. [ref] , versus $tanβ$ and $m_χ$, respectively.
B -> D tau nu Branching Ratios: Opportunity for Lattice QCD and Hadron Colliders · $B →τν$ and $B →D + τ+ ν$ at Belle and BaBar · 0.88
Uses data or values from 31 papers
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We recall that the present collection of data by the same Collaboration [ref] amounts to an exposure of 1.17 ton x year, with an evidence for an annual modulation effect at 8.9 $σ$ C.L..
New results from DAMA/LIBRA · Introduction · 0.98
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where the numerical coefficient in front of the right-hand-side is normalized to the experimental upper bound at 95% C.L., $BR(B_s →μ^+ μ^-) ≤5.8 ×10^-8$ [ref] (this is the latest published value by the CDF Collaboration; a somewhat smaller value is reported in an unpublished CDF Public Note 9892 [ref] ).
Search for Bs --> mu+mu- and Bd --> mu+mu- Decays with 2fb-1 of ppbar Collisions · Search for the rare decay $B_s →μ^+ + μ^-$ at the Tevatron · 1.00
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Taking into account that $R_ΔM_B,s = 0.80 ±0.12$ [ref] , which at 95% C.L. implies an allowed range $0.57 < R_ΔM_B,s < 1.03$, one sees that the quantity $ΔM_B,s$ does not imply any additional constraint on the LNM parameter space.
Hints of large tan(beta) in flavour physics · Search for the rare decay $B_s →μ^+ + μ^-$ at the Tevatron · 0.98
Compares with 7 papers
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These are situations which are naturally obtained in our LNM, contrary to the situation that occurs in SUGRA–like models, as the one considered in Ref. [ref] .
Low Mass Neutralino Dark Matter in the MSSM with Constraints from $B_s\to \mu^+\mu^-$ and Higgs Search Limits · Search for the rare decay $B_s →μ^+ + μ^-$ at the Tevatron · 0.88
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In the course of our discussion we will also comment on how our results compare with some of the outcomes of other recent papers where numerical analyses of the previously mentioned constraints have been discussed (see, for instance, Refs. [ref] ).
Light Neutralinos with Large Scattering Cross Sections in the Minimal Supersymmetric Standard Model · Introduction · 0.96
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In the course of our discussion we will also comment on how our results compare with some of the outcomes of other recent papers where numerical analyses of the previously mentioned constraints have been discussed (see, for instance, Refs. [ref] ).
Light mixed sneutrinos as thermal dark matter · Introduction · 0.96
Cites as support 1 paper
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Nevertheless, we recall that, for the reasons mentioned at the beginning of the present Section, it seems premature to enforce these constraints rigidly at the present time (see Ref. [ref] for similar comments).
Leptonic Decays of Charged Pseudoscalar Mesons · $B →τν$ and $B →D + τ+ ν$ at Belle and BaBar · 0.96
Cites as background 7 papers
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Other possible signals due to relic light neutralinos are mentioned in Ref. [ref] .
Interpreting the recent results on direct search for dark matter particles in terms of relic neutralino · Links to indirect searches for dark matter particles · 0.89
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It is obvious that great expectations are on the outcomes that hopefully will come out from the Large Hadron Collider at CERN to bring light to properties related to supersymmetry (in Ref. [ref] the perspectives of searching for light neutralino of cosmological interest at LHC are investigated).
Light neutralinos at LHC in cosmologically-inspired scenarios: new benchmarks in the search for supersymmetry · Conclusions · 0.87
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Also the possibility of investigating light WIMPs at neutrino telescopes has been the subject of specific investigations [ref] .
Testing the Dark Matter Interpretation of the DAMA/LIBRA Result with Super-Kamiokande · Links to indirect searches for dark matter particles · 0.93
Discussion
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