B->3lnu lines

First version of the builders and lines for selecting the B->3lnu decays. Current rates (on the full minbias sample):

HLT rates: 
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Line:    Hlt2SLB_B2EEENuLineDecision             Incl: 0.33371153974504436 +/- 0.14 kHz, Excl: 0.06674230794900889 +/- 0.06 kHz
Line:    Hlt2SLB_B2EEENu_OneFakeLineDecision     Incl: 0.06674230794900889 +/- 0.06 kHz, Excl: 0.0  +/- 0.0  kHz
Line:    Hlt2SLB_B2EEENu_SSLineDecision          Incl: 0.40045384769405323 +/- 0.16 kHz, Excl: 0.13348461589801777 +/- 0.09 kHz
Line:    Hlt2SLB_B2EEENu_TriFakeLineDecision     Incl: 1.2013615430821598 +/- 0.28 kHz, Excl: 1.2013615430821598 +/- 0.28 kHz
Line:    Hlt2SLB_B2EMuMuNuLineDecision           Incl: 0.06674230794900889 +/- 0.06 kHz, Excl: 0.06674230794900889 +/- 0.06 kHz
Line:    Hlt2SLB_B2EMuMuNu_FakeELineDecision     Incl: 0.0  +/- 0.0  kHz, Excl: 0.0  +/- 0.0  kHz
Line:    Hlt2SLB_B2EMuMuNu_SSLineDecision        Incl: 0.06674230794900889 +/- 0.06 kHz, Excl: 0.06674230794900889 +/- 0.06 kHz
Line:    Hlt2SLB_B2MuEENuLineDecision            Incl: 0.26696923179603554 +/- 0.13 kHz, Excl: 0.20022692384702662 +/- 0.11 kHz
Line:    Hlt2SLB_B2MuEENu_FakeMuLineDecision     Incl: 0.0  +/- 0.0  kHz, Excl: 0.0  +/- 0.0  kHz
Line:    Hlt2SLB_B2MuEENu_SSLineDecision         Incl: 0.06674230794900889 +/- 0.06 kHz, Excl: 0.06674230794900889 +/- 0.06 kHz
Line:    Hlt2SLB_B2MuMuMuNuLineDecision          Incl: 0.06674230794900889 +/- 0.06 kHz, Excl: 0.06674230794900889 +/- 0.06 kHz
Line:    Hlt2SLB_B2MuMuMuNu_OneFakeLineDecision  Incl: 0.0  +/- 0.0  kHz, Excl: 0.0  +/- 0.0  kHz
Line:    Hlt2SLB_B2MuMuMuNu_TriFakeLineDecision  Incl: 0.5339384635920711 +/- 0.18 kHz, Excl: 0.5339384635920711 +/- 0.18 kHz
Line:    Hlt2SLB_B2TauEENu_3PiLineDecision       Incl: 0.0  +/- 0.0  kHz, Excl: 0.0  +/- 0.0  kHz
Line:    Hlt2SLB_B2TauEENu_3Pi_SSLineDecision    Incl: 0.0  +/- 0.0  kHz, Excl: 0.0  +/- 0.0  kHz
Line:    Hlt2SLB_B2TauMuMuNu_3PiLineDecision     Incl: 0.0  +/- 0.0  kHz, Excl: 0.0  +/- 0.0  kHz
Line:    Hlt2SLB_B2TauMuMuNu_3Pi_SSLineDecision  Incl: 0.06674230794900889 +/- 0.06 kHz, Excl: 0.06674230794900889 +/- 0.06 kHz
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Hlt2 Total:                                        Rate:         3 +/- 0.4 kHz
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Perhaps I need to tighten the prescales for the TriFake lines further down (I have already did some tightening there before this test).

I have also checked on the existing signal MC sample of B->3munu (run over 1000 events):

Line:	 Hlt2SLB_B2MuMuMuNuLineDecision             	 Efficiency:	 0.336 +/- 0.021
Line:	 Hlt2SLB_B2MuMuMuNu_OneFakeLineDecision     	 Efficiency:	 0.000 +/- 0.000
Line:	 Hlt2SLB_B2MuMuMuNu_TriFakeLineDecision     	 Efficiency:	 0.010 +/- 0.004

(the latter two lines are prescaled, so it makes sense their rate is much smaller than the signal's rate)

I do not think we have any upgrade samples to check the other final states than the 3mu one.

• TODO: add the unphysical tau selection.