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Pure Gravity Mediation of Supersymmetry Breaking at the LHC

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Biplob Bhattacherjee, Brian Feldstein, Masahiro Ibe, Shigeki Matsumoto, Tsutomu T. Yanagida

High Energy Physics - Phenomenology · Submitted 23 Jul 2012 · 52 references

Pith's verdict: A solid, well-validated recast of gluino and wino limits for pure gravity mediation; the physics holds, but the abstract squeezes a two-dimensional contour into two flat numbers.

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arXiv ID1207.5453 (version 1)
Pith ID7YHS33L2, Pith's permanent record of this paper and its review
CitationBiplob Bhattacherjee, Brian Feldstein, Masahiro Ibe, Shigeki Matsumoto, Tsutomu T. Yanagida. "Pure Gravity Mediation of Supersymmetry Breaking at the LHC." arXiv:1207.5453 (2012). https://pith.science/paper/7YHS33L2
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The paper

The paper claims

In pure gravity mediation every squark and slepton sits at tens to thousands of TeV, leaving only the gauginos within the LHC's reach, and the paper argues that existing 7 TeV data already exclude gluinos below about 1 TeV and winos below a

The reading

The paper asks what the LHC can still say about supersymmetry if one gives up on naturalness entirely. In the 'pure gravity mediation' scenario it examines, all the scalars — squarks, sleptons, the heavy Higgs bosons, the gravitino — are pushed to tens or thousands of TeV, which simultaneously explains the 125 GeV Higgs mass, suppresses flavor-changing and CP violation, and removes the cosmological Polonyi problem. The gauginos are the exception: anomaly mediation plus threshold corrections from heavy higgsinos make them lighter than everything else by two to three orders of magnitude, so the gluino, wino and bino are the only superpartners the LHC could ever produce. The paper's job is therefore to convert existing and projected LHC searches into exclusion and reach contours in the gluino-wino mass plane, using two signatures: gluino pairs giving jets plus missing energy, and long-lived charged winos giving disappearing charged tracks. The payoff is a concrete statement of how much of this otherwise inaccessible model is already gone and how much a 14 TeV run could cover.

What carries the argument

The mechanism carrying the argument is the near-degeneracy of the charged and neutral wino. Because the wino is an $SU(2)_L$ triplet, its charged and neutral components are split only at one loop, by about 160-170 MeV for wino masses of a few hundred GeV. That tiny splitting forces the charged wino to decay through a neutral wino and a charged pion with a lifetime of order $10^{-10}$ s, giving a decay length of a few centimeters — long enough to leave the inner detector, short enough to be seen as a track that stops in the middle of the detector and leaves no hit in the outer layers. The second piece of machinery is the anomaly-mediated mass relation, which for purely anomaly-mediated gaugino masses makes the gluino about eight times heavier than the wino, with the ratio shrinking as the higgsino threshold contribution $L$ grows; this is what makes the model more reachable than conventional anomaly mediation, since the gluino can be as light as twice the wino mass.

Extended reading notes

Core claim

The central claim is a pair of contours. Using the 7 TeV, 5 fb$^{-1}$ jets-plus-missing-energy search, the authors simulate gluino pair production (each gluino decaying to two light quarks plus a charged or neutral wino) and compare with the published upper limit, finding that the region with $m_{gluino} < 1$ TeV and $m_{wino} < 300$ GeV is excluded at 95% confidence. Extrapolating to 300 fb$^{-1}$ at 14 TeV with the same analysis, the reach extends to $m_{gluino} < 2.4$ TeV and $m_{wino} < 1$ TeV. A second, more model-specific handle comes from the charged wino: it is nearly degenerate with the neutral wino, lives about $1.4 imes 10^{-10}$ s, and so travels a few centimeters before decaying into a soft pion that is essentially invisible. That produces a disappearing charged track, which the authors use both for gluino decays and for direct electroweak wino production. They find the track-based gluino bound is currently weaker than the jets-plus-missing-energy bound, because the transition radiation tracker sits about a meter from the beam pipe while the wino decays after roughly 5 cm; the track search would become competitive if inner-detector layers were used. In the meantime, if the gluino is heavier than about 1 TeV, the best wino limit is the old LEP radiative-return bound, $M_2 > 92$ GeV.

Load-bearing premise

The disappearing-track projections rest on a Standard Model background rejection factor that has not been measured and on a detector simulation the authors say cannot model the track accurately, so those contours are conditional on a number the paper can only parametrize.

Editorial extensions

If this is right

  • If the contours hold, a 14 TeV LHC run with 300 fb$^{-1}$ either finds a gluino below about 2.4 TeV or a wino below about 1 TeV, or pushes both beyond the reach of the machine for this model.
  • Because the wino is the lightest superpartner and its thermal relic mass is about 2.7 TeV, a wino light enough to be seen at the LHC must have its abundance set non-thermally by gravitino decays, which ties the collider reach to the reheating temperature and hence to thermal leptogenesis.
  • The heavy scalar spectrum required here is exactly the one that yields a 125 GeV Higgs, so a confirmed Higgs mass near that value plus continued null results for squarks is the natural home for this scenario.
  • A dedicated search for disappearing tracks in the innermost pixel layers, rather than the transition radiation tracker, would tighten the wino bound substantially at fixed luminosity.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • The same long-lived-wino signature makes this scenario testable outside colliders: winos produced in the early universe and decaying now would give a sharply peaked, low-energy contribution to cosmic-ray antiprotons or gamma rays, so a null indirect-detection signal at the predicted level would squeeze the sub-TeV wino window even without new collider data.
  • Because the charged wino's decay length scales as $(\Delta m)^{-3}$ and $\Delta m$ grows only logarithmically with mass, the track signature barely changes across the whole accessible mass range, which means the search strategy is nearly mass-blind and a single well-characterized background measurement would serve the entire contour.
  • The paper's own remark that the gluino can be as light as twice the wino mass suggests a compressed-spectrum corner where the jets-plus-missing-energy search loses efficiency because the visible energy release is small; that corner is where the disappearing-track search would carry the most weight, and it deserves a dedicated study rather than a single contour line.
Original abstract

Supersymmetric theories which can allow for a 125 GeV Higgs mass and also solve the naturalness and susy flavor problems now require a fair degree of complexity. Here we consider the simplest possibility for supersymmetry near the weak scale, but with the requirement of naturalness dropped. In "pure gravity mediation", all supersymmetric particles except for the gauginos lie at tens to thousands of TeV, with the gauginos obtaining loop suppressed masses automatically by anomaly mediation and higgsino threshold corrections. The gauginos are the lightest superpartners, and we investigate the current collider constraints on their masses, as well as the future reach of the LHC. We consider gluino pair production with a jets + missing energy signature, as well as events with disappearing charged tracks caused by charged winos decaying into their neutral partners. We show that presently, gluino masses less than about 1 TeV and wino masses less than about 300 GeV are excluded, and that the 14 TeV LHC can probe gluino masses up to about 2 TeV and wino masses up to 1 TeV.

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.

Compiled by classifier-1.13-20260917 via OpenRouter, question bank abstract-p1-20260923, 2026-09-23: 1 request, 5,127 input tokens, $0.0002 reported.

What the abstract itself states, as probabilities: claims first 0.04 · states limitation 0.59 · human participants 0.01 · controlled comparison 0.03 · randomized assignment 0.01 · states quantitative result 0.98 · compares with prior results 0.19 · mentions code or data availability 0.02.

The abstract, sentence by sentence

arXiv listing abstract v1. Results and the main claim are underlined; .

Supersymmetric theories which can allow for a 125 GeV Higgs mass and also solve the naturalness and susy flavor problems now require a fair degree of complexity. Here we consider the simplest possibility for supersymmetry near the weak scale, but with the requirement of naturalness dropped. In "pure gravity mediation", all supersymmetric particles except for the gauginos lie at tens to thousands of TeV, with the gauginos obtaining loop suppressed masses automatically by anomaly mediation and higgsino threshold corrections. The gauginos are the lightest superpartners, and we investigate the current collider constraints on their masses, as well as the future reach of the LHC. We consider gluino pair production with a jets + missing energy signature, as well as events with disappearing charged tracks caused by charged winos decaying into their neutral partners. We show that presently, gluino masses less than about 1 TeV and wino masses less than about 300 GeV are excluded, and that the 14 TeV LHC can probe gluino masses up to about 2 TeV and wino masses up to 1 TeV.

background contribution method result interpretation main claim

What the classifier reports for each sentence. The number is the probability it gave the label.
#sentencerolethe authors' own workstates the main conclusionstrength
s0 Supersymmetric theories which can allow for a 125 GeV Higgs mass and also solve the naturalness and susy flavor problems now require a fair degree of complexity. background 1.00 0.07 0.03 asserted 0.83
s1 Here we consider the simplest possibility for supersymmetry near the weak scale, but with the requirement of naturalness dropped. contribution 0.81 0.35 0.04 asserted 0.66
s2 In "pure gravity mediation", all supersymmetric particles except for the gauginos lie at tens to thousands of TeV, with the gauginos obtaining loop suppressed masses automatically by anomaly mediation and higgsino threshold corrections. contribution 0.70 0.17 0.12 asserted 1.00
s3 The gauginos are the lightest superpartners, and we investigate the current collider constraints on their masses, as well as the future reach of the LHC. contribution 0.99 0.75 0.09 asserted 0.86
s4 We consider gluino pair production with a jets + missing energy signature, as well as events with disappearing charged tracks caused by charged winos decaying into their neutral partners. method 0.71 0.61 0.04 asserted 0.87
s5 We show that presently, gluino masses less than about 1 TeV and wino masses less than about 300 GeV are excluded, and that the 14 TeV LHC can probe gluino masses up to about 2 TeV and wino masses up to 1 TeV. result 1.00 0.88 0.78 asserted 1.00

What kind of paper the classifier reports this is: theoretical result 0.82 · evidence from analysis of existing data 0.50.

What was examined, and what was not

sources read
  • arXiv listing abstract v1
not examined
  • full text
  • figures and tables
  • references and citing sentences
  • relations to other papers
levels run
  • P abstract
not run
  • S sections
  • T body sentences
  • C citations
  • R cross-paper relations

Every quoted sentence on this record is the authors'. Every label is from Pith's closed vocabulary, with the probability shown beside it. Every number in the measurements table is the authors', checked by code. Record as JSON

Figures
Figure 1. The correlation between the gluino and wino masses in pure gravity mediation for a given L. The solid blue line corresponds to the prediction for purely anomaly mediated gaugino masses, i.e. L = 0. In the light shaded region, the wino mass becomes heavier than the bino mass due to large higgsino threshold effects (L & 3m3/2 ). where δSUSY = log[MSUSY/100 TeV], δ32 denotes δ32 = log[m3/2/100 TeV] for the gluino, and δ32 = log[(m3/2 + L)/100 TeV] for the wino. The terms proportional to m3/2 in the above formulae represent the anomaly mediated contributions, while those proportional to…
Figure 2. The contour plot of the lightest Higgs boson mass. Here, we have fixed m3/2 = µH = MSUSY. The orange band shows the Higgs boson mass 124 GeV < mh < 127 GeV observed by the ATLAS and CMS collaborations for the central value of the top quark mass. The light orange band is the one including the 1σ error of the top quark mass. In the gray shaded region, the gluino mass is below about 1 TeV, which is predicted by the anomaly mediation in equation (6) for MSUSY = m3/2 . The detailed discussion on the constraint on the gluino mass is discussed in the following section. and the charged wino…
Figure 3. Bounds on the gluino and wino masses in the PGM model obtained with 5 fb−1 of data at 7 TeV running. The solid blue line (g˜ → qq¯w˜ (w/o track)) is obtained via the gluino pair production without use of the disappearing track information, while the solid magenta line (g˜ → qq¯w˜ (w/ track)) is obtained with use of the disappearing track information. The LEP bound on the wino mass is also shown (from the radiative return process). For other lines, please see the text. The region with mbino < mwino is shaded because this region is not favored from the viewpoint of cosmology…
Figure 4. Expected bounds on the gluino and wino masses obtained with 300 fb−1 of data at 14 TeV running. The solid red line (14 TeV (w/o track)) is obtained by the gluino pair production without use of the disappearing track information, while the solid dark-green line (14 TeV (w/ track) [ǫ = 0.01]) and light-green line (14 TeV (w/ track) [ǫ = 0.1]) are obtained by the production with use of the disappearing track information for the cases of ǫ = 0.01 and 0.1, respectively. Other lines are the same as those in figure 3. In all cases, the gluino is assumed to decay into two light quarks and a…
Figure 5. Cross sections for the direct wino production at the 14 TeV LHC with 300 fb−1 of data. The solid magenta line (wino pair + 1 jet) is the wino pair production associated with a jet (a colored parton), while the solid blue line (wino pair + 2 jets (VBF)) is the wino pair production through vector boson fusion processes. These cross sections are obtained after applying appropriate selection cuts. For details, please see the text. model is compatible with the thermal leptogenesis scenario thanks to the decay of the gravitino before BBN. In addition, the model predicts an attractive…

Figures reproduced from arXiv:1207.5453 by the authors.

References
How the literature uses it

47 arXiv papers cite this in 65 sentences

Each citing sentence is taken from the citing paper's LaTeX source and typed by Pith's classifier. A label appears at probability 0.8 or more (0.95 for support), a contest at 0.7 or more; the quoted words are the citing authors'. How each label was checked · JSON

Papers citing it · 42 sentences without a confident label

Uses its data or values 2 papers
  • As summarized in Ref. [ref] , the most severe limit on the gluino mass is obtained from the search for multi-jets plus missing transverse energy events at the LHC, which leads to $m_g̃ > 1.2 (1.0)$ TeV for a wino mass of $100 (500)$GeV [ref] .

    Supersymmetric Dark Matter after Run I at the LHC: From a TeV to a PeV · Pure Gravity Mediation · 0.89

  • As summarized in Ref. [ref] , the most severe limit on the gluino mass is obtained from the search for multi-jets plus missing transverse energy events at the LHC, which leads to $m_g̃ > 1.2 (1.0)$ TeV for a wino mass of $100 (500)$GeV [ref] .

    Universality in Pure Gravity Mediation · Parameter Scan of Pure Gravity Mediation · 0.85

Compares with it 3 papers
  • Compared to a dedicated recent example study in Ref. [ref] , our significance estimation is a bit more optimistic.

    Gaugino physics of split supersymmetry spectrum at the LHC and future proton colliders · AMSB gauginos without higgsinos · 1.00

  • This situation is parallel to, for example, high-scale supersymmetry breaking models with anomaly mediated gaugino mass [ref] such as pure gravity mediation model/minimal split SUSY [ref] (see also e.g. Ref. [ref] ), which also predicts that the gluino is within the reach of the future collider experiments [ref] , while explaining the observed Higgs boson mass with a large$m_stop$.$

    Revisiting R-invariant Direct Gauge Mediation · Summary · 0.80

  • [ This prediction can be contrasted with the predictions in pure gravity mediation model [ref] /minimal-split SUSY model [ref] which are also favored in view of minimality, where the model can be tested through the gaugino searches [ref] . ]

    Testing the Minimal Direct Gauge Mediation at the LHC · Discussions and Conclusions · 1.00

Cites it as support 1 paper
  • From these considerations one may find the case of the wino NLSP with $|M_2| - |M_1| < m_Z$ particularly interesting because the neutral wino can become long-lived for $|μ| O(10^1-2)$ TeV.[ This mass spectrum of bino and wino is also motivated by a recent scan of the 10-dimensional parameter space of phenomenological MSSM [ref] .] With $|μ| ∼O(10^1-2)$ TeV, the contributions from the higgsino threshold corrections and the anomaly mediation are of the order of $O(10^2-3)$ GeV and a large variety of the wino and bino spectra, including compressed spectrum for the three-body decays, can be naturally achieved by the interplay between these contributions [ref] .

    Long-lived bino and wino in supersymmetry with heavy scalars and higgsinos · Large mass splitting between gauginos and higgsinos · 0.97

Cites it as background 14 papers
  • Now, let us move on to an even simpler version of supergravity, pure gravity mediation (PGM) [ref] .

    Universality in Pure Gravity Mediation · PGM and Universality · 0.98

  • Such scenarios have been widely discussed in the models of pure gravity mediation [ref] , the models with strong moduli stabilization [ref] , the spread supersymmetry [ref] , and the minimal split supersymmetry [ref] , all of which explain the observed mass of about 126 GeV for the Higgs boson [ref] .

    AMS-02 Positrons from Decaying Wino in the Pure Gravity Mediation Model · Introduction · 0.84

  • The possibility that supersymmetry is dynamically broken in supergravity models in a stable vacuum has been considered for some time [ref] , and more recently in [ref] .

    Gravity Mediation Retrofitted · Introduction · 0.93

What it cites · 8 sentences without a confident label

Uses the method or tool of 2 papers
  • Based on the strategy of object reconstructions and kinematical selections from reference [ref] , we have calculated the cross section (times acceptance) of the signal process using the Pythia [ref] and Delphes [ref] codes.[Our simulation framework has been verified by reproducing event distributions and corresponding cut-flow table of the signal process presented in reference [ref] using appropriate sample points.

    Delphes, a framework for fast simulation of a generic collider experiment · Current bounds · 0.94

  • In order to obtain the Higgs boson mass, we have solved the one-loop renormalization-group equations in accordance with references [ref] with a boundary condition given by the so-called SUSY relation, [equation] at the energy scale of $M_SUSY$.

    Probing High-Scale and Split Supersymmetry with Higgs Mass Measurements · The lightest Higgs boson mass · 1.00

Uses data or values from 1 paper
Compares with 1 paper

Discussion

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