REVIEW
Direct, Indirect and Collider Detection of Neutralino Dark Matter In SUSY Models with Non-universal Higgs Masses
High Energy Physics - Phenomenology · Submitted 1 Apr 2005 · 107 references
Pith's verdict: The structural result is real and useful — NUHM1 gives two low-relic-density solutions at any tan beta and m0, NUHM2 opens new co-annihilation regions — but the detection-rate numbers are looser than the abstract implies, and the paper never shows the overlap between its VR>1 contours and the WMAP central band.
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Referee report
The paper
The paper claims
Letting the Higgs soft masses differ from squark masses turns two narrow dark-matter corners into broad, tunable regions, and puts neutralinos within reach of direct detection and a linear collider.
The reading
What carries the argument
The argument runs through the renormalization-group evolution of the Higgs soft masses and the two electroweak-symmetry-breaking minimization conditions. The key relation is that a deviation of the Higgs mass from the universal value at the GUT scale survives running with its sign intact but shrinks in magnitude, $Delta m_{H_u}^2(mathrm{weak}) simeq Delta m_{H_u}^2(mathrm{GUT}), e^{-J_t}$ with $J_t = frac{3}{8pi^2} int dt, f_t^2 > 0$, so positive and negative $m_phi$ push $mu$ and $m_A$ in opposite directions through $mu^2 = frac{m_{H_d}^2 - m_{H_u}^2 tan^2beta}{tan^2beta - 1} - frac{M_Z^2}{2}$ and $m_A^2 = m_{H_u}^2 + m_{H_d}^2 + 2mu^2$. In NUHM2 a nonzero $S = m_{H_u}^2 - m_{H_d}^2$ enters the third-generation and first-generation scalar RGEs with hypercharge-weighted signs, splitting squark and slepton masses within a generation. The phenomenological filter is a $chi^2$ over three measurements — $Omega_{mathrm{CDM}} h^2 = 0.113 pm 0.009$, $BF(b to sgamma) = (3.25 pm 0.37) times 10^{-4}$ and $Delta a_mu = (27 pm 10) times 10^{-10}$ — plus the LEP2 chargino bound $m_{tilde W_1} geq 103.5$ GeV, with spectra from Isajet, relic densities from IsaReD and detection rates from DarkSUSY. Detection prospects are expressed as visibility ratios, signal over projected sensitivity, computed for two self-consistent halo models (a cored Burkert profile and an adiabatically contracted N03 profile) so that direct and indirect channels are compared on the same footing.
Extended reading notes
Core claim
The central claim is that splitting the GUT-scale Higgs soft masses from the matter-scalar mass $m_0$ changes which supersymmetric spectra are compatible with the measured relic density, and changes them in a way that is observable. In NUHM1 the authors argue that for essentially any choice of $m_0$, $m_{1/2}$ and $tan beta$ there are two values of $m_phi$ that bring $Omega_{tilde Z_1} h^2$ into the WMAP range: a large negative $m_phi$ pushes the pseudoscalar mass $m_A$ down to roughly twice the neutralino mass, opening the A-annihilation funnel at any $tan beta$ including low values; a large positive $m_phi$ drives $m_{H_u}^2$ negative faster during running, so that $|mu|$ becomes small while $m_0$ stays low, giving a higgsino-like lightest neutralino without the multi-TeV scalars of the minimal model's focus point. In NUHM2, $mu$ and $m_A$ can be taken as weak-scale inputs, so either region is reachable by choice for any $m_0$, $m_{1/2}$ and $tan beta$ that yields a valid spectrum. The paper further identifies co-annihilation regions that exist only in NUHM2: a large positive $S = m_{H_u}^2 - m_{H_d}^2$ drives the right-handed up and charm squarks very light, and a large negative $S$ makes the left sleptons and sneutrinos light, both of which suppress the relic density and, in the squark case, strongly enhance the spin-independent neutralino-proton cross section.
Load-bearing premise
The detection-rate claims assume that the neutralino makes up the full local dark matter density even at parameter points whose computed thermal relic abundance falls short of the measured value; the authors state this explicitly in Sec. 2.4, where they do not rescale the visibility ratios downward, and footnote 1 invokes unspecified non-thermal production or a cosmological enhancement to make up the difference.
Editorial extensions
If this is right
- The relic-density constraint stops being a filter that forces either large $tan beta$ or multi-TeV scalar masses; spectra with low $tan beta$ and low $m_0$ become viable, so the WMAP measurement alone no longer points to a particular corner of the supersymmetric parameter space.
- In the low-$mu$ higgsino region, charginos and neutralinos are light enough that a $sqrt{s} = 0.5$–1 TeV linear collider can reach beyond the LHC, because the LHC reach is set by squark and gluino masses while the collider reach is set by $mu$.
- In the A-funnel region, $H$, $A$ and $H^pm$ can be light enough for direct production at the LHC or a linear collider, and can appear in gluino and squark cascades, at values of $tan beta$ far below where the minimal model allows this.
- In NUHM2, very light $tilde u_R$ and $tilde c_R$ squarks or light left sleptons can supply the needed co-annihilation, giving large spin-independent direct detection rates and, for the squarks, dijet plus missing-energy signals at hadron colliders.
- The same relic density can be reproduced by spectra with very different collider signatures, so a measurement of the dark matter density alone does not determine what the LHC or a linear collider will see.
Reading between the lines
- If the thermal relic abundance is later shown to saturate the cosmic density with no non-thermal component, the parameter regions where $Omega h^2$ falls below about 0.094 would be removed, and with them much of the funnel and higgsino parameter space used here to argue for observable rates.
- The NUHM2 squark co-annihilation window makes the spin-independent cross section a sharp function of the Higgs mass splitting, so a null result from a ton-scale direct detection experiment would translate into a constraint on $S$ at the GUT scale rather than merely on $m_0$ and $m_{1/2}$.
- Because the funnel can open at low $tan beta$, the usual expectation that cascade decays are tau-rich in funnel points does not carry over, which changes the event selection that collider searches should optimize for dark-matter-motivated spectra.
- The two-parameter version effectively promotes $mu$ and $m_A$ to inputs, so any future measurement of a light Higgsino and a heavy pseudoscalar (or the reverse) would already discriminate NUHM2 from the one-parameter case without a full spectrum fit.
Original abstract
In supersymmetric models with gravity-mediated SUSY breaking, universality of soft SUSY breaking sfermion masses m_0 is motivated by the need to suppress unwanted flavor changing processes. The same motivation, however, does not apply to soft breaking Higgs masses, which may in general have independent masses from matter scalars at the GUT scale. We explore phenomenological implications of both the one-parameter and two-parameter non-universal Higgs mass models (NUHM1 and NUHM2), and examine the parameter ranges compatible with Omega_CDM h^2, BF(b --> s,gamma) and (g-2)_mu constraints. In contrast to the mSUGRA model, in both NUHM1 and NUHM2 models, the dark matter A-annihilation funnel can be reached at low values of tan(beta), while the higgsino dark matter annihilation regions can be reached for low values of m_0. We show that there may be observable rates for indirect and direct detection of neutralino cold dark matter in phenomenologically aceptable ranges of parameter space. We also examine implications of the NUHM models for the Fermilab Tevatron, the CERN LHC and a Sqrt(s)=0.5-1 TeV e+e- linear collider. Novel possibilities include: very light s-top_R, s-charm_R squark and slepton_L masses as well as light charginos and neutralinos and H, A and H^+/- Higgs bosons.
The compiled record
The paper's own sentences, arranged, kept beside the review and separate from it. Each label is drawn from a closed vocabulary; the number beside it is the probability the classifier gave that label. Numbers in the tables are the authors', checked by code. No sentence in this record was written by a model.
The abstract, sentence by sentence
In supersymmetric models with gravity-mediated SUSY breaking, universality of soft SUSY breaking sfermion masses m_0 is motivated by the need to suppress unwanted flavor changing processes. The same motivation, however, does not apply to soft breaking Higgs masses, which may in general have independent masses from matter scalars at the GUT scale. We explore phenomenological implications of both the one-parameter and two-parameter non-universal Higgs mass models (NUHM1 and NUHM2), and examine the parameter ranges compatible with Omega_CDM h^2, BF(b --> s,gamma) and (g-2)_mu constraints. In contrast to the mSUGRA model, in both NUHM1 and NUHM2 models, the dark matter A-annihilation funnel can be reached at low values of tan(beta), while the higgsino dark matter annihilation regions can be reached for low values of m_0. We show that there may be observable rates for indirect and direct detection of neutralino cold dark matter in phenomenologically aceptable ranges of parameter space. We also examine implications of the NUHM models for the Fermilab Tevatron, the CERN LHC and a Sqrt(s)=0.5-1 TeV e+e- linear collider. Novel possibilities include: very light s-top_R, s-charm_R squark and slepton_L masses as well as light charginos and neutralinos and H, A and H^+/- Higgs bosons.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | In supersymmetric models with gravity-mediated SUSY breaking, universality of soft SUSY breaking sfermion masses m_0 is motivated by the need to suppress unwanted flavor changing processes. | background 1.00 | 0.05 | 0.02 | asserted 0.97 |
| s1 | The same motivation, however, does not apply to soft breaking Higgs masses, which may in general have independent masses from matter scalars at the GUT scale. | background 0.95 | 0.08 | 0.03 | hedged possibility 0.91 |
| s2 | We explore phenomenological implications of both the one-parameter and two-parameter non-universal Higgs mass models (NUHM1 and NUHM2), and examine the parameter ranges compatible with Omega_CDM h^2, BF(b --> s,gamma) and (g-2)_mu constraints. | contribution 0.92 | 0.87 | 0.07 | asserted 0.79 |
| s3 | In contrast to the mSUGRA model, in both NUHM1 and NUHM2 models, the dark matter A-annihilation funnel can be reached at low values of tan(beta), while the higgsino dark matter annihilation regions can be reached for low values of m_0. | result 1.00 | 0.78 | 0.16 | asserted 0.99 |
| s4 | We show that there may be observable rates for indirect and direct detection of neutralino cold dark matter in phenomenologically aceptable ranges of parameter space. | result 0.98 | 0.90 | 0.63 | hedged possibility 0.89 |
| s5 | We also examine implications of the NUHM models for the Fermilab Tevatron, the CERN LHC and a Sqrt(s)=0.5-1 TeV e+e- linear collider. | contribution 0.90 | 0.79 | 0.04 | asserted 0.81 |
| s6 | Novel possibilities include: very light s-top_R, s-charm_R squark and slepton_L masses as well as light charginos and neutralinos and H, A and H^+/- Higgs bosons. | result 0.91 | 0.71 | 0.07 | hedged possibility 0.88 |
What was examined, and what was not
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- references and citing sentences
- relations to other papers
- P abstract
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Figures
Showing 24 of the paper's 26 figures. See all figures in the PDF ↗ Figures reproduced from arXiv:hep-ph/0504001 by the authors.
References
How later papers used it
47 later papers cite it
2 papers by the same authors are listed below: 1 used its method or tool and 1 used its data or values.
Uses its method or tool 1 of 4 papers with this label · 1 by the same authors
By the same authors
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Generated its expected ⟨σv⟩ region from a scan over mAMSB models without SE using calculations from Isatools.
SUSY under siege from direct and indirect WIMP detection experiments (2016) (same authors) · 0.89 · paraphrased: the licence does not allow quoting
Uses its data or values 1 paper · 1 by the same authors
By the same authors
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This BM point is taken from the three-extra-parameter non-universal Higgs model NUHM3 [ref] , with parameters $m_0(1,2)=10$ TeV, $m_0(3)=5$ TeV, $m_1/2=1.2$ TeV, $A_0=-8$ TeV, $tanβ=10$ with $μ=200$ GeV and $m_A=2$ TeV.
Dark matter and dark radiation from the early universe with a modulus coupled to the PQMSSM (2023) (same authors) · A natural MSSM benchmark model · 0.93
How the literature uses it
46 arXiv papers cite this in 64 sentences
Papers citing it · 50 sentences without a confident label
Uses its method or tool 3 papers
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To begin our calculation of the expected distribution of the $μ$ parameter from the landscape, we adopt the two-extra-parameter non-universal Higgs SUSY model NUHM2 [ref] where matter scalar soft masses are unified to $m_0$ whilst Higgs soft masses $m_H_u$ and $m_H_d$ are independent.[It is more realistic to allow independent generations $m_0(1)$, $m_0(2)$ and $m_0(3)$ but these will hardly affect our results here.
Distribution of supersymmetry mu parameter and Peccei-Quinn scale f_a from the landscape · GSPQ model in the multiverse · 0.87
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We use Prospino [ref] to generate the NLO pair production cross sections and we use a natural SUSY benchmark point from the NUHM2 [ref] model (as generated with Isajet [ref] ) with parameters $m_0=5$ TeV, $m_1/2=1.2$ TeV, $A_0=-8$ TeV, $tanβ=10$ with $m_A=2$ TeV and $μ$ variable over the range $μ∼100-500$ GeV.
Aspects of the WIMP quality problem and R-parity violation in natural supersymmetry with all axion dark matter · Limits on RPV couplings from LHC in natural SUSY · 0.99
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In our present discussion, we will adopt the 3 extra parameter non-universal Higgs model (NUHM3) for explicit calculations [ref] .
Mini-review: Expectations for supersymmetry from the string landscape · Sparticle and Higgs mass distributions from the landscape: $n=±1$ · 0.92
Uses its data or values 1 paper
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This BM point is taken from the three-extra-parameter non-universal Higgs model NUHM3 [ref] , with parameters $m_0(1,2)=10$ TeV, $m_0(3)=5$ TeV, $m_1/2=1.2$ TeV, $A_0=-8$ TeV, $tanβ=10$ with $μ=200$ GeV and $m_A=2$ TeV.
Dark matter and dark radiation from the early universe with a modulus coupled to the PQMSSM · A natural MSSM benchmark model · 0.93
Compares with it 2 papers
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This case is very similar to the NUHM1 model with negative Higgs mass-squareds in [ref] .
U(1)_R-mediated supersymmetry breaking from a six-dimensional flux compactification · Low energy spectrum and phenomenology · 0.98
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In that sense our model has many similarities with the non-universal Higgs model which also has $μ$ and $M_2$ as independent parameters [ref] .
Constraining the MSSM with universal gaugino masses and implication for searches at the LHC · Introduction · 0.83
Cites it as background 7 papers
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We will answer this question basically in two versions of the MSSM: the Constrained MSSM (CMSSM) and the non-universal Higgs mass (NUHM) MSSM [ref] .
Light charged Higgs at the beginning of the LHC era · Supersymmetric models · 0.88
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These parameters including $μ, m_A^0$ influence the SUSY particle mass spectrum [ref] .
Mass Spectrum Dependence of Higgs-mediated mu-e Transition in the MSSM · The non-universal Higgs mass (NUHM) model · 0.80
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Alternate models relax the assumptions of universality for the soft SUSY-breaking contributions to the Higgs masses, which differ from the universal scalar mass $M_0$, for instance, NUHM1 [ref] , NUHM2 [ref] , and NUHM3 [ref] , etc.
Light right-handed Smuons at the LHC: Natural dark matter and $g_{\mu}-2$ in an unexplored realm of the pMSSM · Introduction · 0.96
Discussion
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