SModelS Database Update v1.2.3 K. Khosa, Charanjit; Kraml, Sabine; Lessa, Andre ...
Letters in high energy physics,
03/2020, Volume:
2020, Issue:
1
Journal Article
Peer reviewed
Open access
We present an update of the SModelS database with simplified model results from 13 ATLAS and 10 CMS searches for supersymmetry at Run 2. This includes 5 ATLAS and 1 CMS analyses for full Run 2 ...luminosity, i.e., close to 140/fb of data. In total, 76 official upper limit and efficiency map results have been added. Moreover, 21 efficiency map results have been produced by us using MadAnalysis5, to improve the coverage of gluino-squark production. The constraining power of the new database, v1.2.3, is compared to that of the previous release, v1.2.2. SModelS v1.2.3 is publicly available and can readily be employed for physics studies.
SModelS is an automatized tool enabling the fast interpretation of simplified model results from the LHC within any model of new physics respecting a Z2 symmetry. With the version 1.2 we announce ...several new features. First, previous versions were restricted to missing energy signatures and assumed prompt decays within each decay chain. SModelSv1.2 considers the lifetime of each Z2-odd particle and appropriately takes into account missing energy, heavy stable charged particle and R-hadron signatures. Second, the current version allows for a combination of signal regions in efficiency map results whenever a covariance matrix is available from the experiment. This is an important step towards fully exploiting the constraining power of efficiency map results. Several other improvements increase the user-friendliness, such as the use of wildcards in the selection of experimental results, and a faster database which can be given as a URL. Finally, smodelsTools provides an interactive plots maker to conveniently visualize the results of a model scan.
Program Title: SModelS
Program Files doi:http://dx.doi.org/10.17632/w4nft4459w.2
Licensing provisions: GPLv3
Programming language: Python3
Journal reference of previous version: Comput. Phys. Commun. 227 (2018) 72
Does the new version supersede the previous version?: Yes
Reasons for the new version: Addition of new features.
Summary of revisions: The most important new features in v1.2 are the combination of signal regions in efficiency map results whenever a covariance matrix is available from the experiment, and the implementation of heavy stable charged particle and R-hadron signatures. Moreover, the database of experimental results can now be given as a URL, and the pickling has been improved to make the database faster. Other improvements include that wildcards are allowed when selecting analyses, datasets or topologies, and that the path to the model file, formerly required to be smodels/sparticles.py, can be specified in the parameters card. For the convenience of the user, we also provide a tool to make interactive plots to visualize the results of a model scan. Finally, the whole code now also runs with Python3, which has become the recommended default, and it can now be installed in its source directory.
Nature of problem: The results for searches for new physics beyond the Standard Model (BSM) at the Large Hadron Collider are often communicated by the experimental collaborations in terms of constraints on so-called simplified models spectra (SMS). Understanding how SMS constraints impact a realistic new physics model, where possibly a multitude of production channels and decay modes are relevant, is a non-trivial task.
Solution method: We exploit the notion of simplified models to constrain full models by “decomposing” them into their SMS components. A database of SMS results obtained from the official results of the ATLAS and CMS collaborations, but in part also from ‘recasting’ the experimental analyses, can be matched against the decomposed model, resulting in a statement to what extent the model at hand is in agreement or contradiction with the experimental results. Further useful information on, e.g., the coverage of the model’s signatures is also provided.
Additional comments including restrictions and unusual features: At present, only models with a Z2-like symmetry can be tested. Each SMS is defined purely by the vertex structure and the final-state particles; initial and intermediate BSM particles are described only by their masses, production cross sections, branching ratios and total widths. Possible differences in signal selection efficiencies arising, e.g., from different production mechanisms or from the spin of the BSM particles, are ignored in this approach. Since only part of the full model can be constrained by SMS results, SModelS will always remain more conservative (though orders of magnitude faster) than “full recasting” approaches.
1 F. Ambrogi et al., “SModelS v1.1 user manual: Improving simplified model constraints with efficiency maps,” Comput. Phys. Commun. 227 (2018) 72 arXiv:1701.06586 hep-ph.
We present an update of the SModelS database with simplified model results from 13 ATLAS and 10 CMS searches for supersymmetry at Run 2. This includes 5 ATLAS and 1 CMS analyses for full Run 2 ...luminosity, i.e. close to 140/fb of data. In total, 76 official upper limit and efficiency map results have been added. Moreover, 21 efficiency map results have been produced by us using MadAnalysis5, to improve the coverage of gluino-squark production. The constraining power of the new database, v1.2.3, is compared to that of the previous release, v1.2.2. SModelS v1.2.3 is publicly available and can readily be employed for physics studies.
New developments in SModelS Alguero, Gaël; Heisig, Jan; Khosa, Charanjit K ...
arXiv (Cornell University),
12/2020
Paper, Journal Article
Open access
SModelS is an automatized tool enabling the fast interpretation of simplified model results from the LHC within any model of new physics respecting a \(\mathbb{Z}_2\) symmetry. In this contribution, ...we report on two important updates of SModelS during 2020: the extension of the SModelS' database with 13 ATLAS and 10 CMS analyses, including 5 ATLAS and 1 CMS analyses at full Run~2 luminosity, and the ability to use full likelihoods now provided by ATLAS in the form of pyhf JSON files. Moreover, we briefly explain how to use SModelS and give an overview of ongoing developments.
SModelS is an automatised tool enabling the fast interpretation of simplified model results from the LHC within any model of new physics respecting a \(\mathbb{Z}_2\) symmetry. With the version 1.2 ...we announce several new features. First, previous versions were restricted to missing energy signatures and assumed prompt decays within each decay chain. SModelS v1.2 considers the lifetime of each \(\mathbb{Z}_2\)-odd particle and appropriately takes into account missing energy, heavy stable charge particle and R-hadron signatures. Second, the current version allows for a combination of signal regions in efficiency map results whenever a covariance matrix is available from the experiment. This is an important step towards fully exploiting the constraining power of efficiency map results. Several other improvements increase the user-friendliness, such as the use of wildcards in the selection of experimental results, and a faster database which can be given as a URL. Finally, smodelsTools provides an interactive plots maker to conveniently visualize the results of a model scan.
This paper investigates the palaeoceanographic setting and evolution of two biostratigraphically well constrained Upper Cretaceous sections in the Eastern Alps of Austria. The duration of the ...investigated time interval is confined by the total range zone of Radotruncana calcarata which was a very short lived (806 000yrs) species as calibrated using orbital parameters. This results in a precise time frame for paleoenvironmental interpretations within this interval. Stable isotope stratigraphy links both sections to published records. The two studied sections are located at the passive (northern) margin of the European Foreland and at the active (southern) margin of a northwestern Tethys ocean branch, respectively. We use mineralogy, clay mineralogy, element geochemistry, carbonate-associated elements and element ratios, Sr isotope stratigraphy and stable C and O isotopes to characterize the profiles. Mn/Sr ratios as well as stable C and O isotopes indicate that the sediments are largely diagenetically unaltered. Both sections have a similar history concerning their sea-level evolution, i.e. a gradual third-order regression with short fourth-order transgressive intervals. The inferred water temperature increases at both locations and the overall primary production and nutrient availability increased slightly with time. Predominately suboxic conditions are confined to the southern profile and were interrupted by oxic spells of ~50kyr duration and even shorter periods of increases in primary production. We also found evidence of a strong aeolian influence on the cyclic deposition of marl–limestone couplets in the southern profile.
The similar history at both geodynamic settings indicates that the southern block close to the subduction zone was relatively stable for the duration of R. calcarata total range zone.
•Two time-equivalent Cretaceous records from Alpine Tethys with low diagenesis•Sediment accumulation is between 0.01 and 0.19mm/kyr.•Temperature and epipelagic primary production increase in R. calcarata Zone.•At the southern Alpine Tethys a local suboxic environment developed.
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