Implications of naturalness for the heavy Higgs bosons of supersymmetry

Bae, Kyu Jung; Baer, Howard; Barger, V.; Mickelson, Dan; Savoy, Michael

doi:10.1103/physrevd.90.075010

Cited by 20 publications

(27 citation statements)

References 70 publications

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“…In such a case, the local WIMP abundance is expected to be suppressed by a factor 10-15 from the usual assumption, thus allowing the RNS higgsinos to escape present bounds. Even with a depleted local abundance, ton-size noble liquid detectors should be able to test the entire RNS parameter space with ∆ EW < 100 [57]. The recent null WIMP search results from the LUX [58] and XENON100 [59] experiments will likely exclude a small region along the edge of the green region where the thermal neutralino relic density saturates the observed cold dark matter density.…”

Section: Discussionmentioning

confidence: 99%

“…Thus, LHC14 plus ILC600 can make a complete search for RNS models which automatically accommodate electroweak naturalness along with m h ≃ 125 GeV. These collider signals should also be accompanied by direct and perhaps indirect dark matter signals from detections of relic higgsinos [57], which would likely make up only a portion of the entire dark matter abundance. We also show the region accessible to LHC8 gluino pair searches (solid blue contour), and the region accessible to LHC14 searches with 300 fb −1 of integrated luminosity (dashed and dot-dashed contours).…”

Section: Discussionmentioning

confidence: 99%

“…The utility of ∆ EW stems from the fact that ∆ EW is essentially determined by the SUSY spectrum, independently of the HS dynamics that generates the spectrum. SUSY models with spectra that lead to large values of ∆ EW are necessarily fine-tuned, whereas a spectrum with low values of ∆ EW leaves open the possibility of finding an underlying framework where the fine-tuning is small [12,7,13].…”

Section: Introduction To Radiative Natural Susymentioning

confidence: 99%

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Radiatively-driven natural supersymmetry at the LHC

Baer

Barger

Huang

et al. 2013

J. High Energ. Phys.

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112

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Radiatively-driven natural supersymmetry (RNS) potentially reconciles the Z and Higgs boson masses close to ∼ 100 GeV with gluinos and squarks lying beyond the TeV scale. Requiring no large cancellations at the electroweak scale in constructing M Z = 91.2 GeV while maintaining a light Higgs scalar with m h ≃ 125 GeV implies a sparticle mass spectrum including light higgsinos with mass ∼ 100 − 300 GeV, electroweak gauginos in the 300 − 1200 GeV range, gluinos at 1 − 4 TeV and top/bottom squarks in the 1-4 TeV range (probably beyond LHC reach), while first/second generation matter scalars can exist in the 5-30 TeV range (far beyond LHC reach). We investigate several characteristic signals for RNS at LHC14. Gluino pair production yields a reach up to mg ∼ 1.7 TeV for 300 fb −1 . Wino pair production -pp → W 2 Z 4 and W 2 W 2 -leads to a unique same-sign diboson (SSdB) signature accompanied by modest jet activity from daughter higgsino decays; this signature provides the best reach up to mg ∼ 2.1 TeV within this framework. Wino pair production also leads to final states with (W Z → 3ℓ) + E miss T as well as 4ℓ + E miss T which give confirmatory signals up to mg ∼ 1.4 TeV. Directly produced light higgsinos yield a clean, soft trilepton signature (due to very low visible energy release) which can be visible, but only for a not-too-small a Z 2 − Z 1 mass gap. The clean SSdB signal -as well as the distinctive mass shape of the dilepton mass distribution from Z 2,3 → Z 1 ℓℓ decays if this is accessible -will mark the presence of light higgsinos which are necessary for natural SUSY. While an e + e − collider operating with √ s ∼ 600 GeV should unequivocally reveal the predicted light higgsinos, the RNS model with m 1/2 1 TeV may elude all LHC14 search strategies even while maintaining a high degree of electroweak naturalness.-1 -

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introduction To Radiative Natural Susymentioning

confidence: 99%

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Radiatively-driven natural supersymmetry at the LHC

Baer

Barger

Huang

et al. 2013

J. High Energ. Phys.

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112

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“…22 and so can be much larger: in the multi-TeV range without violating naturalness. Since the heavy SUSY Higgs masses m A,H,H ± ∼ m H d , then these could all live in the TeV range, perhaps beyond the reach of LHC13 [106].…”

Section: The Term Mmentioning

confidence: 99%

Supergravity gauge theories strike back: there is no crisis for SUSY but a new collider may be required for discovery

2015

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More than 30 years ago, Arnowitt-Chamseddine-Nath (ACN) and others established the compelling framework of supergravity gauge theories (SUGRA) as a picture for the next step in beyond the Standard Model physics. We review the current SUGRA scenario in light of recent data from LHC8 collider searches and the Higgs boson discovery. While many SUSY and non-SUSY scenarios are highly disfavored or even excluded by LHC, the essential SUGRA scenario remains intact and as compelling as ever. For naturalness, some non-universality between matter and Higgs sector soft terms is required along with substantial trilinear soft terms. SUSY models with radiatively-driven naturalness (RNS) are found with high scale fine-tuning at a modest ∼ 10%. In this case, natural SUSY might be discovered at LHC13 but could also easily elude sparticle search endeavors. A linear e + e − collider with √ s > 2m(higgsino) is needed to provide the definitive search for the required light higgsino states which are the hallmark of natural SUSY. In the most conservative scenario, we advocate inclusion of a Peccei-Quinn sector so that dark matter is composed of a WIMP/axion admixture i.e. two dark matter particles.

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“…In SUSY, δm 2 h is instead logarithmically divergent, and includes terms such as [2,3], although this rather severe fine-tuning measure ignores non-independent contributions to m 2 h which lead to large cancellations [4]. A model-independent, more conservative measure which allows for cancellations within m 2 h requires that the magnitude of all weak scale contributions to m 2 h (or m 2 Z ) be comparable to m 2 h (or m 2 Z ).…”

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confidence: 99%

Mainly axion cold dark matter from natural supersymmetry

2014

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By eschewing fine-tuning from the electroweak and QCD sectors of supersymmetry (natural supersymmetry or SUSY), and by invoking the Kim-Nilles solution to the SUSY µ problem, one is lead to models wherein the dark matter is comprised of a mixture of axions and Higgsino-like WIMPs. Over a large range of Peccei-Quinn breaking scale fa ∼ 10 9 − 10 12 GeV, one then expects about 90-95% axion dark matter. In such a scenario, both axion and WIMP direct detection may be expected. 95.35.+d, 14.80.Ly, 11.30.Pb The recent discovery of a Higgs-like boson with mass m h ≃ 125 GeV at the CERN LHC is a triumph of modern particle physics [1]. But it brings with it a conundrum: why is the Higgs mass so small? In the Standard Model (SM), one may calculatewhere the radiative correction δm 2 h ∼ − 3f 2 t 8π 2 Λ 2 +· · · where f t ∼ 1 is the top quark Yukawa coupling and Λ is a high energy cutoff/regulator which denotes the limit of validity of the effective theory. If the SM is to be valid at energy scales Λ far beyond m weak ∼ 100 GeV, then an enormous fine-tuning will be required to maintain m h ∼ 125 GeV.Supersymmetric (SUSY) theories of particle physics provide all-orders cancellations of the quadratic divergences thus stabilizing the Higgs mass. In SUSY, δm 2 h is instead logarithmically divergent, and includes terms such as Hu | is small but the Σ u u terms become large positive, Σ u u ≫ m 2 Z , again a large value of µ 2 must be imposed, leading again to fine-tuning.) To avoid large uncorrelated cancellations (fine-tuning) in the Z mass, then one expects |µ| and |m Hu | ∼ m Z , or of order 100 − 200 GeV [5,6]. In addition, requiring the dominant radiative corrections(whereQ 2 − 1) with Q 2 ≃ mt 1 mt 2 the optimized scale choice for minimization of the scalar potential) to be < ∼ 100 − 200 GeV then requires highly mixed top squarks with mass mt 1 ∼ 1 − 2 TeV and mt 2 ∼ 3 − 4 TeV [5,6]. 1 Such highly mixed top squark masses lift m h into the 125 GeV range (even with stops as light as a few TeV) since m h is maximized for large mixing [7]. The TeV-scale top squark masses are also heavy enough to suppress anomalous contributions to b → sγ decay and to avoid recent LHC null results for top squark searches [5].The above features have enormous implications for SUSY phenomenology: in this case, the lightest SUSY 1 Using the full radiative corrections, then large values of weak scale At suppress Σ u u (t 1 ) via the square bracket in Eq. (4) and via the F function for Σ u u (t 2 ). The suppression due to mixing then allows for much larger stop masses (around the few TeV scale) than are found in generic natural SUSY models, where it is often claimed that mt 1,2 need be < ∼ 200 − 500 GeV [3].

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Implications of naturalness for the heavy Higgs bosons of supersymmetry

Cited by 20 publications

References 70 publications

Radiatively-driven natural supersymmetry at the LHC

Radiatively-driven natural supersymmetry at the LHC

Supergravity gauge theories strike back: there is no crisis for SUSY but a new collider may be required for discovery

Mainly axion cold dark matter from natural supersymmetry

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