| Literature DB >> 28260982 |
E Bagnaschi1, J C Costa2, K Sakurai3,4, M Borsato5, O Buchmueller2, R Cavanaugh6,7, V Chobanova5, M Citron2, A De Roeck8,9, M J Dolan10, J R Ellis11,12, H Flächer13, S Heinemeyer14,15,16, G Isidori17, M Lucio5, D Martínez Santos5, K A Olive18, A Richards2, K J de Vries2, G Weiglein1.
Abstract
We perform a likelihood analysis of the constraints from accelerator experiments and astrophysical observations on supersymmetric (SUSY) models with SU(5) boundary conditions on soft SUSY-breaking parameters at the GUT scale. The parameter space of the models studied has seven parameters: a universal gaugino mass [Formula: see text], distinct masses for the scalar partners of matter fermions in five- and ten-dimensional representations of SU(5), [Formula: see text] and [Formula: see text], and for the [Formula: see text] and [Formula: see text] Higgs representations [Formula: see text] and [Formula: see text], a universal trilinear soft SUSY-breaking parameter [Formula: see text], and the ratio of Higgs vevs [Formula: see text]. In addition to previous constraints from direct sparticle searches, low-energy and flavour observables, we incorporate constraints based on preliminary results from 13 TeV LHC searches for jets + [Formula: see text] events and long-lived particles, as well as the latest PandaX-II and LUX searches for direct Dark Matter detection. In addition to previously identified mechanisms for bringing the supersymmetric relic density into the range allowed by cosmology, we identify a novel [Formula: see text] coannihilation mechanism that appears in the supersymmetric SU(5) GUT model and discuss the role of [Formula: see text] coannihilation. We find complementarity between the prospects for direct Dark Matter detection and SUSY searches at the LHC.Entities:
Year: 2017 PMID: 28260982 PMCID: PMC5312117 DOI: 10.1140/epjc/s10052-017-4639-6
Source DB: PubMed Journal: Eur Phys J C Part Fields ISSN: 1434-6044 Impact factor: 4.590
List of experimental constraints used in this work, including experimental and (where applicable) theoretical errors: supersymmetric theory uncertainties are indicated separately. Instances where our implementations differ from those in Table 1 in [15] are indicated by arrows and boldface
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| [ | 0.1465 ± 0.0032 |
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Fig. 1Left panel the ratio of the cross section that we find in the range of and favoured in our analysis before implementing the LHC 13-TeV constraint, relative to the cross section found in the simplified model with . Right panel the corresponding ratio of the cross section, relative to the cross section for found in the simplified model with
Fig. 2The solid lines show the CMS 95% CL exclusion in the plane [9], assuming a simplified model with heavy squarks and 100% BR for . The left (right) panel shows the best-fit point (green star), 68 and 95% CL contours (red and blue lines, respectively) for obtained without (with) the CMS 13-TeV constraint. The dominant (>50%) decays into first- and second-generation quarks and squarks and third-generation quarks and squarks found in the SUSY SU(5) model are colour-coded as indicated
Fig. 3The black lines show the CMS 95% CL exclusion in the plane [9], assuming a simplified model with heavy gluinos and 100% BR for : the solid lines assume that all the squarks of the first two generations are degenerate, the dashed lines assume two degenerate squarks, and the dotted lines assume just one squark. All panels show the best-fit point (green star), 68 and 95% CL contours (red and blue lines, respectively) for and the masses of the first- and second-generation right-handed up-type squarks (upper panels) and the down-type squarks (lower panels). In both cases, the left panels were obtained without the CMS 13-TeV constraint, and the right panels include it. The dominant (>50%) decays found in the SUSY SU(5) model are colour-coded as indicated
Ranges of the SUSY SU(5) GUT parameters sampled, together with the numbers of segments into which each range was divided, and the corresponding total number of sample boxes. The mass parameters are expressed in TeV units
| Parameter | Range | Number of segments |
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| (0, 4) | 2 |
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| (−2.6, 8) | 2 |
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| (−1.3, 4) | 3 |
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| (−7, 7) | 3 |
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| (−7, 7) | 3 |
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| (−8, 8) | 1 |
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| (2, 68) | 1 |
| Total number of boxes | 108 |
Fig. 4The plane (left panel) and the plane (right panel) in the SUSY SU(5) GUT model. The best-fit point is shown as a green star, the red contour surrounds the 68% CL region, and the blue contour surrounds the 95% CL region. The coloured shadings represent the dominant DM mechanisms, as indicated in the lower panel and described in the text
Parameters of the best-fit point in the SUSY SU(5) GUT model, with mass parameters given in GeV units. The numbers in parentheses in the bottom row are for a fit that does not include the LHC 13-GeV constraints and the recent PandaX-II and LUX constraints on DM scattering. Note that we use the same convention for the sign of as in [10–16], which is opposite to the convention used in, e.g., SoftSUSY, and that we use the notation for and
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| 1050 | −220 | 380 | −5210 | −4870 | −5680 | 12 |
| (890) | (−80) | (310) | (−4080) | (−4420) | (5020) | (11) |
Fig. 5The plane in the SUSY SU(5) GUT model. The line colours and shadings are the same as in Fig. 4
Fig. 6The plane (upper panel), the plane (lower left panel) and the plane (lower right panel) in the SUSY SU(5) GUT model. The line colours and shadings are the same as in Fig. 4
Fig. 7The plane (upper left panel), the plane (upper right panel), the plane (lower left panel) and the plane (lower right panel) in the SUSY SU(5) GUT model. The line colours and shadings are the same as in Fig. 4
Fig. 8The plane in the SUSY SU(5) GUT model. The line colours and shadings are the same as in Fig. 4
Fig. 9On the left the plane in the SUSY SU(5) GUT model. The line colours and shadings are the same as in Fig. 4. On the right the likelihood function for the pseudoscalar mass
Fig. 10The likelihood functions in the SUSY SU(5) GUT model (blue lines) for the gluino mass (top left panel), the left-handed squark mass (top right panel), the right-handed down squark mass (centre left panel), the right-handed up squark mass (centre right panel), the lighter stop squark mass (lower left panel) and the lighter stau slepton mass (lower right panel). The dashed blue lines show the result of omitting the LHC 13-TeV constraints, and the grey lines represent ‘fake’ NUHM2 results obtained by selecting a subset of the SU(5) sample with
Particle masses at the best-fit point in the SUSY SU(5) GUT model (in GeV units)
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| 470 | 660 | 630 | 678 | 570 | 2130 | 1840 | 2180 |
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| 1940 | 2090 | 2000 | 1980 | 2310 | 1620 | 460 | 860 |
Fig. 11The spectrum at the best-fit point in the SUSY SU(5) GUT model. Decay branching ratios (BRs) exceeding 20% are denoted by dashed lines, which are thicker for more important BRs
Fig. 12The one-dimensional 68 and 95% CL ranges of masses we obtain for the current fit in the supersymmetric SU(5) model, shown in dark and light orange, respectively. The best-fit point is represented by blue lines
Fig. 13Left panel the likelihood function in the SUSY SU(5) GUT model for in the coannihilation strip region (the solid/dashed line includes/omits the 13-TeV LHC data). Right panel the region of the plane where
Fig. 14The contributions of (teal) and LHC 13-TeV data (red) in the SUSY SU(5) GUT model, as functions of (left panel), (middle panel) and (right panel)
The principal contributions of observables at the best-fit point in the SUSY SU(5) GUT model, together with the total function
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| 3.40 | 0.35 | 0.78 | 6.79 | 0.82 | 0.08 | |
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| 0.26 | 0.00 | 0.18 | 0.00 | 0.00 | 2.09 | |
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| 0.60 | 0.07 | 1.04 | 0.0 | 8.28 | 0.01 | |
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| HiggsSignals | LHC | Total |
| 2.54 | 1.78 | 1.94 | 0.00 | 67.95 | 0.3 | 100.34 |
Fig. 15The pulls for different observables at the best-fit point in the SUSY SU(5) model
Fig. 16The likelihood functions in the SUSY SU(5) GUT model for the mass (upper left panel), the mass (upper right panel), the mass difference (lower left panel) and the mass difference (lower right panel). The dashed blue lines shows the result of omitting the LHC 13-TeV constraints, and the grey lines represent ‘fake’ NUHM2 results obtained by selecting a subset of the SU(5) sample with
Fig. 17The likelihood functions in the SUSY SU(5) GUT model for the mass (left panel) and the lifetime (right panel). The dashed blue lines shows the result of omitting the LHC 13-TeV constraints, and the grey lines represent ‘fake’ NUHM2 results obtained by selecting a subset of the SU(5) sample with
Fig. 18The likelihood functions in the SUSY SU(5) GUT model for (upper left panel), (upper right panel), (lower left panel), and (lower right panel). The dashed blue lines shows the result of omitting the LHC 13-TeV constraints, and the solid grey lines represent ‘fake’ NUHM2 results obtained by selecting a subset of the SU(5) sample with ., and the dotted grey lines represent the current experimental measurements with their uncertainties
Fig. 19The likelihood functions for the ratios of the SUSY SU(5) and SM predictions for the BRs of (left panel), (middle panel) and decays (right panel). The dashed blue lines shows the result of omitting the LHC 13-TeV constraints, and the grey lines represent ‘fake’ NUHM2 results obtained by selecting a subset of the SU(5) sample with
Fig. 20The one-dimensional likelihood functions for the full SU(5) sample (solid blue lines) and in the restriction of the SUSY SU(5) GUT model sample to (solid grey lines) compared to those in our previous NUHM2 analysis [14] (dashed grey lines) for (upper left panel), (upper right panel), (lower left panel), and (lower right panel)
Fig. 21Upper left panel the global function in the SUSY SU(5) GUT model as a function of the lifetime. Upper right panel the plane, shaded according to the values of , as indicated. Lower panels the and planes, coloured according to the values of . The 68 and 95% CL contours in these three planes are coloured red and blue, respectively
Fig. 22The plane in the SUSY SU(5) GUT model. The solid green line is the 95% CL upper limit from the XENON100 experiment, and the dashed black solid line is the new 95% CL upper limit from the LUX experiment. The solid black line shows the 95% CL exclusion contour for our combination of the PandaX-II and LUX experiments, the solid purple line shows the projected 95% exclusion sensitivity of the LUX-Zeplin (LZ) experiment, the solid and dashed blue lines show the projected 95% sensitivities of the XENON1T and XENONnT experiments, respectively, and the dashed orange line shows the astrophysical neutrino ‘floor’, below which astrophysical neutrino backgrounds dominate (yellow region). The other line colours and shadings within the 68 and 95% CL regions are the same as in Fig. 4