XSec systematics 2020a

2020a (tentative name) is a modern generation of x-section error, based on the G18_10a_02_11a tune of GENIE 3.0.*.

Systematic parameters

Parameters handled via GENIE reweight:

• genie_qema: CCQE x-section / Axial mass
• genie_qevec: CCQE x-section / Vector mass
• genie_ncelAxial: NCEL x-section / Axial mass
• genie_ncelEta: NCEL x-section / Strange axial form factor
• genie_ccresAxial: CCRES x-section / Axial mass
• genie_ccresVector: CCRES x-section / Vector mass
• genie_ncresAxial: NCRES x-section / Axial mass
• genie_ncresVector: NCRES x-section / Vector mass
• genie_NonResRvp1pi: non-RES bkg x-section / nu+p CC 1-pion normalization
  • the same knob is used to vary the nubar-n CC 1-pion normalization
• genie_NonResRvbarp1pi: non-RES bkg x-section / nubar+p CC 1-pion normalization
  • the same knob is used to vary the nu-n CC 1-pion normalization
• genie_NonResRvp2pi: non-RES bkg x-section / nu+p CC 2-pion normalization
  • the same knob is used to vary the nubar-n CC 2-pion normalization
• genie_NonResRvbarp2pi: non-RES bkg x-section / nubar+p CC 2-pion normalization
  • the same knob is used to vary the nu-n CC 2-pion normalization
• genie_NonResRvp1piAlt: as above, but for NC (*)
• genie_NonResRvbarp1piAlt: as above, but for NC (*)
• genie_NonResRvp2piAlt: as above, but for NC (*)
• genie_NonResRvbarp2piAlt: as above, but for NC (*)
• genie_DISAth: DIS (CC and NC) xsection / Aht (higher twist) param
• genie_DISBth: DIS (CC and NC) xsection / Bht (higher twist) param
• genie_DISCv1u: DIS (CC and NC) xsection / Cv1u valence pdf correction
• genie_DISCv2u: DIS (CC and NC) xsection / Cv2u valence pdf correction
• genie_cohMA: COH (CC and NC) xsection / Axial mass
• genie_cohR0: COH (CC and NC) xsection / Nuclear radius parameter
• genie_NC: Additional error on NC/CC ratio
• genie_ResDecayGamma: Resonance decays / Branching ratio for 1\gamma
• genie_FormZone: Hadronization / formation zone
• genie_AGKYxF: Hadronization / nucleon x_F distribution
• genie_AGKYpT: Hadronization / nucleon p_T distribution
• genie_IntraNukeNmfp: FSI / nucleon mean-free path
• genie_IntraNukeNcex: FSI / nucleon CEx fate fraction
• genie_IntraNukeNinel: FSI / nucleon INEL fate fraction
• genie_IntraNukeNabs: FSI / nucleon ABS fate fraction
• genie_IntraNukeNpi: FSI / nucleon PI-PROD fate fraction
• genie_IntraNukePImfp: FSI / pion mean-free path
• genie_IntraNukePIcex: FSI / pion CEx fate fraction
• genie_IntraNukePIinel: FSI / pion INEL fate fraction
• genie_IntraNukePIabs: FSI / pion ABS fate fraction
• genie_IntraNukePIpi: FSI / pion PI-PROD fate fraction

(*) Comment from fcl file: Alternate parameters for non-resonant backgrounds so that we can reweight CC and NC differently

(**) Removed from 2015a: genie_IntraNukeNel, genie_IntraNukePIel, genie_FermiGasModelKf, genie_FermiGasModelSf, genie_ResDecayEta, genie_ResDecayTheta

Extra parameters:

• genie_mec: Normalization error for CC and NC MEC events (100%)

Internal representation in VALOR

Expanding non-resonance background parameters

Internally, weights from throws of the 8 current (C1-8) non-resonance bkg parameters thrown during the production, were used to construct the effect of 16 new (N1-16) parameters using the mapping shown below:

ID	Systematic (Curr.)	Modes affected	ID	Systematic (New)	Modes affected
C1(—>N1,N4)	genie_NonResRvp1pi	nu+p CC1pi	N1 (<-C1)	genie_NonResRnupCC1pi	nu+p CC1pi
	-//-	nubar+n CC1pi	N2 (<-C2)	genie_NonResRnun1CCpi	nu+n CC1pi
C2(—>N2,N3)	genie_NonResRvbarp1pi	nubar+p CC1pi	N3 (<-C2)	genie_NonResRnubarpCC1pi	nubar+p CC1pi
	-//-	nu+n CC1pi	N4 (<-C1)	genie_NonResRnubarnCC1pi	nubar+n CC1pi
C3(—>N5,N8)	genie_NonResRvp2pi	nu+p CC2pi	N5 (<-C3)	genie_NonResRnupCC2pi	nu+p CC2pi
	-//-	nubar+n CC2pi	N6 (<-C4)	genie_NonResRnunCC2pi	nu+n CC2pi
C4(—>N6,N7)	genie_NonResRvbarp2pi	nubar+p CC2pi	N7 (<-C4)	genie_NonResRnubarpCC2pi	nubar+p CC2pi
	-//-	nu+n CC2pi	N8 (<-C3)	genie_NonResRvbarnCC2pi	nubar+n CC2pi
C5(—>N9,N12)	genie_NonResRvp1piAlt	nu+p NC1pi	N9 (<-C5)	genie_NonResRnupNC1pi	nu+p NC1pi
	-//-	nubar+n NC1pi	N10(<-C6)	genie_NonResRnunNC1pi	nu+n NC1pi
C6(—>N10,N11)	genie_NonResRvbarp1piAlt	nubar+p NC1pi	N11(<-C6)	genie_NonResRnubarpNC1pi	nubar+p NC1pi
	-//-	nu+n NC1pi	N12(<-C5)	genie_NonResRnubarnNC1pi	nubar+n NC1pi
C7(—>N13,N16)	genie_NonResRvp2piAlt	nu+p NC2pi	N13(<-C7)	genie_NonResRnupNC2pi	nu+p NC2pi
	-//-	nubar+n NC2pi	N14(<-C8)	genie_NonResRnunNC2pi	nu+n NC2pi
C8(—>N14,N15)	genie_NonResRvbarp2piAlt	nubar+p NC2pi	N15(<-C8)	genie_NonResRnubarpNC2pi	nubar+p NC2pi
	-//-	nu+n NC2pi	N16(<-C7)	genie_NonResRvbarnNC2pi	nubar+n NC2pi