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) = 13 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) = 13 TeV

mχ̃ [GeV]Sorted descending σ [fb] uncertainty [fb]
2000 0.00072909 5.498e-07
1975 0.00082394 6.556e-07
1950 0.00099779 2.464e-05
1925 0.0010637 8.6e-07
1900 0.0021449 0.0001167
1875 0.0015481 4.631e-05
1850 0.001565 1.141e-06
1825 0.0017791 1.297e-06
1800 0.002061 2.657e-06
1775 0.0023005 1.68e-06
1750 0.0026138 1.983e-06
1725 0.0029732 2.27e-06
1700 0.0033933 1.057e-05
1675 0.0039186 1.532e-05
1650 0.0043972 3.29e-06
1625 0.0050089 3.688e-06
1600 0.0057299 1.195e-05
1575 0.0065112 4.708e-06
1550 0.0074287 5.385e-06
1525 0.0092517 7.1e-05
1500 0.0097317 1.819e-05
1475 0.011092 1.555e-05
1450 0.012654 9.264e-06
1425 0.014512 1.521e-05
1400 0.016577 1.573e-05
1375 0.018988 1.656e-05
1350 0.021743 1.782e-05
1325 0.024923 1.916e-05
1300 0.028614 2.198e-05
1275 0.032878 2.52e-05
1250 0.038521 5.812e-05
1225 0.044146 5.176e-05
1200 0.050696 5.062e-05
1175 0.058325 5.24e-05
1150 0.067281 5.718e-05
1125 0.077722 6.376e-05
1100 0.089904 7.174e-05
1075 0.10414 8.132e-05
1050 0.12085 9.351e-05
1025 0.14044 0.0001082
1000 0.16347 0.0001258
975 0.19061 0.0001468
950 0.22267 0.0001718
925 0.26064 0.0002018
900 0.30575 0.0002361
875 0.35933 0.0002785
850 0.42323 0.0003291
825 0.49996 0.0003904
800 0.59153 0.0004616
775 0.70241 0.0005506
750 0.83633 0.0006588
725 0.99831 0.0007894
700 1.1961 0.0009468
675 1.4394 0.001147
650 1.7389 0.001393
625 2.1099 0.0017
600 2.5726 0.002087
575 3.1543 0.002613
550 3.888 0.003245
525 4.8224 0.004057
500 6.0233 0.005111
475 7.5812 0.00649
450 9.6234 0.008317
425 12.333 0.01058
400 15.978 0.01385
375 20.955 0.01838
350 27.87 0.02474
325 37.68 0.0351
300 51.905 0.04916
275 73.121 0.07055
250 105.82 0.1042
225 158.28 0.1564
200 246.76 0.2498
175 405.85 0.4159
150 717.76 0.7476
125 1408.8 1.522
100 3264.7 3.711
75 10461 12.82
50 1.2223e+05 199.1

-- BasilSchneider - 2018-11-14

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