NLO-NNLL higgsino-like N2N1 cross sections

The following cross sections are for higgsino-like neutralino-neutralino pair production. They have been calculated for sqrt(s) = 27 TeV at NLO-NNLL using Resummino 2.0.1 from B. Fuks et al. The Monte Carlo PDF set with 100 replicas PDF4LHC15_mc is used, which is a statistical combination of CT14, MMHT14 and NNPDF3.0, all using αs(mZ2) = 0.118. The use of this combination of PDF sets is recommended for searches for new Physics by the PDF4LHC Working Group. See https://arxiv.org/abs/1510.03865 for more details.

The cross sections are computed for degenerate charginos and neutralinos. The mass is denoted as mχ̃. The following sentence describes all the assumptions in the cross section calculations and is suitable to be included in the description of the interpretation of your results:

The production cross sections are computed at NLO plus
next-to-next-to-leading-log (NNLL) precision in a limit of mass-degenerate
higgsino $\chiz_2$, $\chipm_1$, and $\chiz_1$ with all the other sparticles
assumed to be heavy and decoupled.

When using these cross sections, some references have to be cited. They can be found below in bibtex format. The references can also be downloaded from this Twiki, see attachments at the bottom.

Resummino:

@article{Debove:2010kf,
      author         = "Debove, Jonathan and Fuks, Benjamin and Klasen, Michael",
      title          = "{Threshold resummation for gaugino pair production at
                        hadron colliders}",
      journal        = "Nucl. Phys. B",
      volume         = "842",
      year           = "2011",
      pages          = "51-85",
      doi            = "10.1016/j.nuclphysb.2010.08.016",
      eprint         = "1005.2909",
      archivePrefix  = "arXiv",
      primaryClass   = "hep-ph",
      reportNumber   = "IPHC-PHENO-10-02, LPSC-10-050",
      SLACcitation   = "%%CITATION = ARXIV:1005.2909;%%"
}
@article{Fuks:2012qx,
      author         = "Fuks, Benjamin and Klasen, Michael and Lamprea, David R.
                        and Rothering, Marcel",
      title          = "{Gaugino production in proton-proton collisions at a
                        center-of-mass energy of 8 TeV}",
      journal        = "JHEP",
      volume         = "10",
      pages          = "081",
      doi            = "10.1007/JHEP10(2012)081",
      year           = "2012",
      eprint         = "1207.2159",
      archivePrefix  = "arXiv",
      primaryClass   = "hep-ph",
      reportNumber   = "IPHC-PHENO-12-07, MS-TP-12-05",
      SLACcitation   = "%%CITATION = ARXIV:1207.2159;%%",
}
@article{Fuks:2013vua,
      author         = "Fuks, Benjamin and Klasen, Michael and Lamprea, David R.
                        and Rothering, Marcel",
      title          = "{Precision predictions for electroweak superpartner
                        production at hadron colliders with {\sc Resummino}}",
      journal        = "Eur. Phys. J. C",
      volume         = "73",
      pages          = "2480",
      doi            = "10.1140/epjc/s10052-013-2480-0",
      year           = "2013",
      eprint         = "1304.0790",
      archivePrefix  = "arXiv",
      primaryClass   = "hep-ph",
      reportNumber   = "CERN-PH-TH-2013-064, IPHC-PHENO-13-02, MS-TP-13-06",
      SLACcitation   = "%%CITATION = ARXIV:1304.0790;%%",
}
@article{Fiaschi:2018hgm,
      author         = "Fiaschi, Juri and Klasen, Michael",
      title          = "{Neutralino-chargino pair production at NLO+NLL with
                        resummation-improved parton density functions for LHC Run
                        II}",
      journal        = "Phys. Rev. D",
      volume         = "98",
      year           = "2018",
      number         = "5",
      pages          = "055014",
      doi            = "10.1103/PhysRevD.98.055014",
      eprint         = "1805.11322",
      archivePrefix  = "arXiv",
      primaryClass   = "hep-ph",
      reportNumber   = "MS-TP-18-19",
      SLACcitation   = "%%CITATION = ARXIV:1805.11322;%%"
}

LHAPDF:

@article{Buckley:2014ana,
      author         = "Buckley, Andy and Ferrando, James and Lloyd, Stephen and
                        Nordström, Karl and Page, Ben and Rüfenacht, Martin and
                        Schönherr, Marek and Watt, Graeme",
      title          = "{LHAPDF6: parton density access in the LHC precision
                        era}",
      journal        = "Eur. Phys. J.",
      volume         = "C75",
      year           = "2015",
      pages          = "132",
      doi            = "10.1140/epjc/s10052-015-3318-8",
      eprint         = "1412.7420",
      archivePrefix  = "arXiv",
      primaryClass   = "hep-ph",
      reportNumber   = "GLAS-PPE-2014-05, MCNET-14-29, IPPP-14-111, DCPT-14-222",
      SLACcitation   = "%%CITATION = ARXIV:1412.7420;%%"
}

PDF4LHC:

@article{Butterworth:2015oua,
      author         = "Butterworth, Jon and others",
      title          = "{PDF4LHC recommendations for LHC Run II}",
      journal        = "J. Phys.",
      volume         = "G43",
      year           = "2016",
      pages          = "023001",
      doi            = "10.1088/0954-3899/43/2/023001",
      eprint         = "1510.03865",
      archivePrefix  = "arXiv",
      primaryClass   = "hep-ph",
      reportNumber   = "OUTP-15-17P, SMU-HEP-15-12, TIF-UNIMI-2015-14,
                        LCTS-2015-27, CERN-PH-TH-2015-249",
      SLACcitation   = "%%CITATION = ARXIV:1510.03865;%%"
}
@article{Carrazza:2015hva,
      author         = "Carrazza, Stefano and Latorre, José I. and Rojo, Juan
                        and Watt, Graeme",
      title          = "{A compression algorithm for the combination of PDF
                        sets}",
      journal        = "Eur. Phys. J.",
      volume         = "C75",
      year           = "2015",
      pages          = "474",
      doi            = "10.1140/epjc/s10052-015-3703-3",
      eprint         = "1504.06469",
      archivePrefix  = "arXiv",
      primaryClass   = "hep-ph",
      reportNumber   = "TIF-UNIMI-2015-2, OUTP-15-01P, IPPP-15-22, DCPT-15-44",
      SLACcitation   = "%%CITATION = ARXIV:1504.06469;%%"
}
@article{Watt:2012tq,
      author         = "Watt, G. and Thorne, R. S.",
      title          = "{Study of Monte Carlo approach to experimental
                        uncertainty propagation with MSTW 2008 PDFs}",
      journal        = "JHEP",
      volume         = "08",
      year           = "2012",
      pages          = "052",
      doi            = "10.1007/JHEP08(2012)052",
      eprint         = "1205.4024",
      archivePrefix  = "arXiv",
      primaryClass   = "hep-ph",
      reportNumber   = "CERN-PH-TH-2012-132, LCTS-2012-11",
      SLACcitation   = "%%CITATION = ARXIV:1205.4024;%%"
}

CT14:

@article{Dulat:2015mca,
      author         = "Dulat, Sayipjamal and Hou, Tie-Jiun and Gao, Jun and
                        Guzzi, Marco and Huston, Joey and Nadolsky, Pavel and
                        Pumplin, Jon and Schmidt, Carl and Stump, Daniel and Yuan,
                        C. P.",
      title          = "{New parton distribution functions from a global analysis
                        of quantum chromodynamics}",
      journal        = "Phys. Rev.",
      volume         = "D93",
      year           = "2016",
      number         = "3",
      pages          = "033006",
      doi            = "10.1103/PhysRevD.93.033006",
      eprint         = "1506.07443",
      archivePrefix  = "arXiv",
      primaryClass   = "hep-ph",
      SLACcitation   = "%%CITATION = ARXIV:1506.07443;%%"
}

MMHT14:

@article{Harland-Lang:2014zoa,
      author         = "Harland-Lang, L. A. and Martin, A. D. and Motylinski, P.
                        and Thorne, R. S.",
      title          = "{Parton distributions in the LHC era: MMHT 2014 PDFs}",
      journal        = "Eur. Phys. J.",
      volume         = "C75",
      year           = "2015",
      number         = "5",
      pages          = "204",
      doi            = "10.1140/epjc/s10052-015-3397-6",
      eprint         = "1412.3989",
      archivePrefix  = "arXiv",
      primaryClass   = "hep-ph",
      reportNumber   = "LCTS-2014-47, IPPP-14-97, DCPT-14-194",
      SLACcitation   = "%%CITATION = ARXIV:1412.3989;%%"
}

NNPDF:

@article{Ball:2014uwa,
      author         = "Ball, Richard D. and others",
      title          = "{Parton distributions for the LHC Run II}",
      collaboration  = "NNPDF",
      journal        = "JHEP",
      volume         = "04",
      year           = "2015",
      pages          = "040",
      doi            = "10.1007/JHEP04(2015)040",
      eprint         = "1410.8849",
      archivePrefix  = "arXiv",
      primaryClass   = "hep-ph",
      reportNumber   = "EDINBURGH-2014-15, IFUM-1034-FT, CERN-PH-TH-2013-253,
                        OUTP-14-11P, CAVENDISH-HEP-14-11",
      SLACcitation   = "%%CITATION = ARXIV:1410.8849;%%"
}

To calculate these cross sections, this repository can be used. The SLHA files can be found there as well: wino.in and hino.in.

Should cross section information be needed for a mass that is not tabulated below, one can obtain it by using the ROOT macros provided under:

/afs/cern.ch/user/a/amete/public/EWKGauginoCrossSections_13TeV

For this specific grid one needs to do:

root -l 'get_gaugino.C("N1N2", "hino", mass)' 

where mass is the mass of the sparticle in GeV. The result of the interpolation can be seen here.

NLO+NNLL Higgsino cross sections for χ̃01χ̃02 production at sqrt(s) = 27 TeV

mχ̃ [GeV] σ [fb] uncertainty [fb]
50 2.6686e+05 457.3
75 24775 32.67
100 8167.1 10.12
125 3687.8 4.394
150 1956.6 2.262
175 1148.8 1.295
200 723.97 0.7983
225 480.84 0.5201
250 332.64 0.353
275 237.73 0.2514
300 174.54 0.1818
325 131.04 0.1346
350 100.26 0.1017
375 77.983 0.07909
400 61.517 0.06165
425 49.135 0.0487
450 39.681 0.03892
475 32.363 0.03192
500 26.626 0.026
525 22.08 0.02136
550 18.443 0.01768
575 15.506 0.01474
600 13.115 0.01236
625 11.153 0.01043
650 9.5329 0.008847
675 8.1847 0.007328
700 7.0586 0.006281
725 6.1119 0.005406
750 5.312 0.004672
775 4.6328 0.004053
800 4.0536 0.003528
825 3.5576 0.00308
850 3.1313 0.002697
875 2.7638 0.002401
900 2.4453 0.002115
925 2.1688 0.001867
950 1.9278 0.001652
975 1.7173 0.001466
1000 1.5329 0.001303
1025 1.3709 0.00116
1050 1.2283 0.001035
1075 1.1024 0.0009258
1100 0.99093 0.0008284
1125 0.89228 0.0007433
1150 0.80487 0.0006685
1175 0.72688 0.0005948
1200 0.65737 0.0005361
1225 0.59509 0.0004836
1250 0.53956 0.0004371
1275 0.4898 0.0003956
1300 0.44514 0.0003584
1325 0.405 0.0003252
1350 0.36888 0.0002953
1375 0.33632 0.0002685
1400 0.30691 0.0002443
1425 0.28036 0.0002225
1450 0.2564 0.0002034
1475 0.23464 0.0001857
1500 0.21491 0.0001699
1525 0.19703 0.0001554
1550 0.18077 0.0001424
1575 0.16598 0.0001306
1600 0.15258 0.0001198
1625 0.14027 0.0001097
1650 0.12905 0.0001007
1675 0.1188 9.291e-05
1700 0.10945 8.541e-05
1725 0.10089 7.858e-05
1750 0.093054 7.234e-05
1775 0.085883 6.665e-05
1800 0.079302 6.18e-05
1825 0.073269 5.701e-05
1850 0.067732 5.261e-05
1875 0.062641 4.857e-05
1900 0.057957 4.484e-05
1925 0.053647 4.141e-05
1950 0.049682 3.826e-05
1975 0.046031 3.539e-05
2000 0.042669 3.275e-05

-- BasilSchneider - 2018-11-14

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