Neutrino-Nucleon Cross-Sections at Energies of Megaton ...€¦ · Neutrino-Nucleon Cross-Sections...
Transcript of Neutrino-Nucleon Cross-Sections at Energies of Megaton ...€¦ · Neutrino-Nucleon Cross-Sections...
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Neutrino-Nucleon Cross-Sections Neutrino-Nucleon Cross-Sections at Energies of Megaton-Scale Detectorsat Energies of Megaton-Scale Detectors
Part II Part II
Askhat GazizovAskhat Gazizov
IP NASB, Minsk, BelarusIP NASB, Minsk, Belarus DESY-Zeuthen, GermanyDESY-Zeuthen, Germany
24.06.2015
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CFA-2015 2
KinematicsKinematics
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CFA-2015 3
KinematicsKinematics
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CFA-2015 4
KinematicsKinematics
νl+N→ l−+X (CC )
ν̄l+N→ l++X (CC )
νl+N →νl+X (NC )
ν̄l+N →ν̄l+X (NC )
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CFA-2015 5
KinematicsKinematics
νl+N→ l−+X (CC )
ν̄l+N→ l++X (CC )
νl+N →νl+X (NC )
ν̄l+N →ν̄l+X (NC )
g
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CFA-2015 6
KinematicsKinematics
νl+N→ l−+X (CC )
ν̄l+N→ l++X (CC )
νl+N →νl+X (NC )
ν̄l+N →ν̄l+X (NC )
g
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CFA-2015 7
KinematicsKinematics
νl+N→ l−+X (CC )
ν̄l+N→ l++X (CC )
νl+N →νl+X (NC )
ν̄l+N →ν̄l+X (NC )
g
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CFA-2015 8
KinematicsKinematics
νl+N→ l−+X (CC )
ν̄l+N→ l++X (CC )
νl+N →νl+X (NC )
ν̄l+N →ν̄l+X (NC )
k =(E , k⃗ )
P=(M , 0⃗)
PX=(EX , p⃗ X)
k '=(E ' , k⃗ ')g
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CFA-2015 9
KinematicsKinematics
νl+N→ l−+X (CC )
ν̄l+N→ l++X (CC )
νl+N →νl+X (NC )
ν̄l+N →ν̄l+X (NC )
k =(E , k⃗ )
P=(M , 0⃗)
PX=(EX , p⃗ X)
k '=(E ' , k⃗ ')
S=(k+P)2=M 2
+2M E
g
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CFA-2015 10
KinematicsKinematics
νl+N→ l−+X (CC )
ν̄l+N→ l++X (CC )
νl+N →νl+X (NC )
ν̄l+N →ν̄l+X (NC )
k =(E , k⃗ )
P=(M , 0⃗)
PX=(EX , p⃗ X)
k '=(E ' , k⃗ ')
Q2=−q2
S=(k+P)2=M 2
+2M E
g
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CFA-2015 11
KinematicsKinematics
νl+N→ l−+X (CC )
ν̄l+N→ l++X (CC )
νl+N →νl+X (NC )
ν̄l+N →ν̄l+X (NC )
k =(E , k⃗ )
P=(M , 0⃗)
PX=(EX , p⃗ X)
k '=(E ' , k⃗ ')
Q2=−q2
S=(k+P)2=M 2
+2M E
g
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CFA-2015 12
KinematicsKinematics
νl+N→ l−+X (CC )
ν̄l+N→ l++X (CC )
νl+N →νl+X (NC )
ν̄l+N →ν̄l+X (NC )
k =(E , k⃗ )
P=(M , 0⃗)
PX=(EX , p⃗ X)
k '=(E ' , k⃗ ')
Q2=−q2
y =q⋅Pk⋅P
=1−E 'E
S=(k+P)2=M 2
+2M E
g
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CFA-2015 13
KinematicsKinematics
νl+N→ l−+X (CC )
ν̄l+N→ l++X (CC )
νl+N →νl+X (NC )
ν̄l+N →ν̄l+X (NC )
k =(E , k⃗ )
P=(M , 0⃗)
PX=(EX , p⃗ X)
k '=(E ' , k⃗ ')
Q2=−q2
y =q⋅Pk⋅P
=1−E 'E
S=(k+P)2=M 2
+2M E
x =Q2
2 M E y
g
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CFA-2015 14
Simplest case – Simplest case – eeee-- scattering scattering
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CFA-2015 15
Simplest case – Simplest case – eeee-- scattering scattering
e
W+
e-
e- e
W+
e-
e- e
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CFA-2015 16
Simplest case – Simplest case – eeee-- scattering scattering
e
W+
e-
e- e
W+
e-
e- e
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CFA-2015 17
Simplest case – Simplest case – eeee-- scattering scattering
e
W+
e-
e- e
W+
e-
e- e
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CFA-2015 18
Simplest case – Simplest case – eeee-- scattering scattering
e
W+
e-
e- e
W+
e-
e- e
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CFA-2015 19
Simplest case – Simplest case – eeee-- scattering scattering
e
W+
e-
e- e
W+
e-
e- e
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CFA-2015 20
Simplest case – Simplest case – eeee-- scattering scattering
e
W+
e-
e- e
W+
e-
e- e
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CFA-2015 21
Simplest case – Simplest case – eeee-- scattering scattering
e
W+
e-
e- e
W+
e-
e- e
At LO QCD just put a quark mass mq instead of the electron for a
scattering off a nucleon and sum the contributions from all quarks.Valence and sea quarks.
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CFA-2015 22
Contributions to the total cross-sectionContributions to the total cross-section
σν Ntot
=σν N(Q )ES
⊗σν N1 π
⊗σν N1 K
⊗σν NDIS
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CFA-2015 23
Contributions to the total cross-sectionContributions to the total cross-section
σν Ntot
=σν N(Q )ES
⊗σν N1 π
⊗σν N1 K
⊗σν NDIS
Elastic scattering (ES) in case of NC:
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CFA-2015 24
Contributions to the total cross-sectionContributions to the total cross-section
σν Ntot
=σν N(Q )ES
⊗σν N1 π
⊗σν N1 K
⊗σν NDIS
Elastic scattering (ES) in case of NC:
Quasi-elastic scattering (QES) for CC:
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CFA-2015 25
Contributions to the total cross-sectionContributions to the total cross-section
σν Ntot
=σν N(Q )ES
⊗σν N1 π
⊗σν N1 K
⊗σν NDIS
Elastic scattering (ES) in case of NC:
Quasi-elastic scattering (QES) for CC:
Single production (RES):
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CFA-2015 26
Contributions to the total cross-sectionContributions to the total cross-section
σν Ntot
=σν N(Q )ES
⊗σν N1 π
⊗σν N1 K
⊗σν NDIS
Elastic scattering (ES) in case of NC:
Quasi-elastic scattering (QES) for CC:
Single production (RES): Resonances with masses 1234 MeV ≤ M
N* ≤ 1970 MeV
are included.
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CFA-2015 27
Contributions to the total cross-sectionContributions to the total cross-section
σν Ntot
=σν N(Q )ES
⊗σν N1 π
⊗σν N1 K
⊗σν NDIS
Elastic scattering (ES) in case of NC:
Quasi-elastic scattering (QES) for CC:
Single production (RES): Resonances with masses 1234 MeV ≤ M
N* ≤ 1970 MeV
are included. Single kaon production: Very small!
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CFA-2015 28
Contributions to the total cross-sectionContributions to the total cross-section
σν Ntot
=σν N(Q )ES
⊗σν N1 π
⊗σν N1 K
⊗σν NDIS
Elastic scattering (ES) in case of NC:
Quasi-elastic scattering (QES) for CC:
Single production (RES): Resonances with masses 1234 MeV ≤ M
N* ≤ 1970 MeV
are included. Single kaon production: Very small! Deep inelastic scattering (DIS): > 2 in the final state XX
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CFA-2015 29
ν̄μ+N →μ++X
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CFA-2015 30
νμ+N →μ−+ X
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CFA-2015 31
Ratios Ratios nn//p p and and nn//pp
E [GeV]
Rat
ios
(E)
Rat
ios
(E)
Check model parameteriation using data for such ratios.
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CFA-2015 32
Total Total NN and and
N N Cross-SectionsCross-Sections
E [GeV]
tot(E
) [1
0-3
8 cm
2 ]
Cross-sections grow proportional to E.
At higher energies just power-law growthdue to sea-quarks density increase.
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CFA-2015 33
N N RatiosRatios
E [GeV]
Ra
tios
(E)
Ra
tios
(E)
At low energies ratio is due to kinematics.Both and quark are left-handed: J = 0. Isotropic distribution.
is right-handed: J = 1,
and
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CFA-2015 34
ντ+N →τ−+X
Tevatron protons pro-duce charm mesons.
appears in the charm
decays.
produces 's's in the
nuclear emulsion. 4 -events registered,while 0.2 expected ifno
One event with a kink from the -decay.
DONUT – Direct Observation of the NU TauDONUT – Direct Observation of the NU Tau
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CFA-2015 35
ν̄τ+N →τ++ X
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CFA-2015 36
νl +N →νl +X
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CFA-2015 37
ν̄l +N →ν̄l +X
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CFA-2015 38
MiniBooNEMiniBooNE
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CFA-2015 39
MiniBooNEMiniBooNE
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CFA-2015 40
MiniBooNEMiniBooNEMiniBooNE employs the NUANCE v3 NUANCE v3 event generator to estimate neutrino interaction rates in the CHCH
22 target medium.
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CFA-2015 41
MiniBooNEMiniBooNEMiniBooNE employs the NUANCE v3 NUANCE v3 event generator to estimate neutrino interaction rates in the CHCH
22 target medium.
The most precision expe-riment. 2-differential cross-sections.
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CFA-2015 42
MiniBooNEMiniBooNEMiniBooNE employs the NUANCE v3 NUANCE v3 event generator to estimate neutrino interaction rates in the CHCH
22 target medium.
The most precision expe-riment. 2-differential cross-sections.Discrepancy between different experiments data is significant.
![Page 43: Neutrino-Nucleon Cross-Sections at Energies of Megaton ...€¦ · Neutrino-Nucleon Cross-Sections at Energies of Megaton-Scale Detectors Part II Askhat Gazizov IP NASB, ... scattering](https://reader033.fdocuments.us/reader033/viewer/2022060719/607f92461aed93091d3ebbe6/html5/thumbnails/43.jpg)
CFA-2015 43
MiniBooNEMiniBooNEMiniBooNE employs the NUANCE v3 NUANCE v3 event generator to estimate neutrino interaction rates in the CHCH
22 target medium.
The most precision expe-riment. 2-differential cross-sections.Discrepancy between different experiments data is significant.We avoided discussion of low energies.Irrelevant for the future PINGU / ORCA megaton experi-ments.
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CFA-2015 44
ES and QES off proton/neutronES and QES off proton/neutron
Eν , th⩾(ml +MN ' )
2−M N
2
2 MN
≃ml (1+ml
2 MN
)
νl +n→ l−+ p
ν̄l + p→ l−+nνl+ p /n→νl+ p/nQESQES ESES
These processes dominate at low energies.There is practically no threshold energy for the ES.ES.The threshold energy for QES with M
N = m
p or m
n
( mn - m
p ≈ 1.293 MeV )
For τ-lepton production with m/m
16.8, m
/m
N 1.9
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CFA-2015 45
Theoretical approach to QESTheoretical approach to QES
See e.g. A. Strumia & F. Vissani, Phys. Lett. B564:42-54, 2003
In terms of the Mandelstam variables
the differential cross-section of QES
where
A(t), B(t) and C(t) may be expressed in terms of vector and axial vector form factors. They are parametrized by the vectormass and the axial-vector mass M V
2 =0.71 GeV2 M AQES
≈1.02 GeV
with FFAA(0) (0) ≈≈ -1.267 -1.267
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CFA-2015 46
QES Cross Sections vs. DataQES Cross Sections vs. Data
E [GeV]
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CFA-2015 47
QES Cross Sections vs. DataQES Cross Sections vs. Data
E [GeV]
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CFA-2015 48
QES Cross Sections vs. DataQES Cross Sections vs. Data
Many experimental data differ.
E [GeV]
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CFA-2015 49
QES Cross Sections vs. DataQES Cross Sections vs. Data
Many experimental data differ.Different targets, different -flux-es, different methods.
E [GeV]
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CFA-2015 50
QES Cross Sections vs. DataQES Cross Sections vs. Data
Many experimental data differ.Different targets, different -flux-es, different methods.A global fit needs a careful choice of data to be included.
E [GeV]
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CFA-2015 51
Sensitivity of QES to MSensitivity of QES to MAA
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CFA-2015 52
Sensitivity of QES to MSensitivity of QES to MAA
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CFA-2015 53
Sensitivity of QES to MSensitivity of QES to MAA
QES cross-sections grow with axial mass MM
AA increasing.
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CFA-2015 54
Sensitivity of QES to MSensitivity of QES to MAA
QES cross-sections grow with axial mass MM
AA increasing.
The threshold of -production is ~30 times higher than in -production case.
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CFA-2015 55
Sensitivity of QES to MSensitivity of QES to MAA
QES cross-sections grow with axial mass MM
AA increasing.
The threshold of -production is ~30 times higher than in -production case.
At high energies QES cross-sections for and coincide.
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CFA-2015 56
Sensitivity of ES to MSensitivity of ES to MAA
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CFA-2015 57
QES off Oxygen TargetQES off Oxygen Target
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CFA-2015 58
QES off Oxygen TargetQES off Oxygen Target
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CFA-2015 59
QES off Oxygen TargetQES off Oxygen Target
At small energies nuclear corrections are important.
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CFA-2015 60
QES off Oxygen TargetQES off Oxygen Target
At small energies nuclear corrections are important.
Shown calculations using standard RFGRFG model.
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CFA-2015 61
QES off Oxygen TargetQES off Oxygen Target
At small energies nuclear corrections are important.
Shown calculations using standard RFGRFG model.
Note that such targets do not exit. But HH
22OO is close.
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CFA-2015 62
QES off Oxygen TargetQES off Oxygen Target
At small energies nuclear corrections are important.
Shown calculations using standard RFGRFG model.
Note that such targets do not exit. But HH
22OO is close.
The difference is just at small energies lower than interesting for PINGU.
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CFA-2015 63
QES off Oxygen TargetQES off Oxygen Target
At small energies nuclear corrections are important.
Shown calculations using standard RFGRFG model.
Note that such targets do not exit. But HH
22OO is close.
The difference is just at small energies lower than interesting for PINGU.
But for future HyperK lower energies are important.
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CFA-2015 64
ES off Oxygen TargetES off Oxygen Target
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CFA-2015 65
Single Pion Production (RES)Single Pion Production (RES)
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CFA-2015 66
Single Pion Production (RES)Single Pion Production (RES)
Processes are discussed in the framework of the Rein&SehgalRein&Sehgal (RS) approach.
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CFA-2015 67
Single Pion Production (RES)Single Pion Production (RES)
Processes are discussed in the framework of the Rein&SehgalRein&Sehgal (RS) approach.
It is based on the Feynman-Kislinger-RavndalFeynman-Kislinger-Ravndal (FKR) relativistic quark model, applied to -excitations of baryon resonances NN∗∗.
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CFA-2015 68
Single Pion Production (RES)Single Pion Production (RES)
Processes are discussed in the framework of the Rein&SehgalRein&Sehgal (RS) approach.
It is based on the Feynman-Kislinger-RavndalFeynman-Kislinger-Ravndal (FKR) relativistic quark model, applied to -excitations of baryon resonances NN∗∗.
Amplitudes of such processes are a coherentcoherent sum over A's A's of all known NN ∗ ∗ = πNπN resonances.
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CFA-2015 69
Single Pion Production (RES)Single Pion Production (RES)
Processes are discussed in the framework of the Rein&SehgalRein&Sehgal (RS) approach.
It is based on the Feynman-Kislinger-RavndalFeynman-Kislinger-Ravndal (FKR) relativistic quark model, applied to -excitations of baryon resonances NN∗∗.
Amplitudes of such processes are a coherentcoherent sum over A's A's of all known NN ∗ ∗ = πNπN resonances.
Vector and axial-vector transition form-factors GGV,AV,A(Q(Q22) ) are parametrized by the standard vector mass MMVV = 0.84 GeV = 0.84 GeV, the same as in the (Q)ES dipole model, and by axial mass .
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CFA-2015 70
Single Pion Production (RES)Single Pion Production (RES)Processes are discussed in the framework of the Rein&SehgalRein&Sehgal (RS) approach.
It is based on the Feynman-Kislinger-RavndalFeynman-Kislinger-Ravndal (FKR) relativistic quark model, applied to -excitations of baryon resonances NN∗∗.
Amplitudes of such processes are a coherentcoherent sum over A's A's of all known NN ∗ ∗ = πNπN resonances.
Vector and axial-vector transition form-factors GGV,AV,A(Q(Q22) ) are parametrized by the standard vector mass MMVV = 0.84 GeV = 0.84 GeV, the same as in the (Q)ES dipole model, and by axial mass .
The RS model was extended (ExRS) to account for the finite mass of secondary leptons in the case of CC-scattering.
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CFA-2015 71
Nucleon Resonances with M < 2 GeVNucleon Resonances with M < 2 GeV according to PDG-2014
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CFA-2015 72
Nucleon Resonances with M < 2 GeVNucleon Resonances with M < 2 GeV according to PDG-2014
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CFA-2015 73
Nucleon Resonances with M < 2 GeVNucleon Resonances with M < 2 GeV according to PDG-2014
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CFA-2015 74
Nucleon Resonances with M < 2 GeVNucleon Resonances with M < 2 GeV according to PDG-2014
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CFA-2015 75
Single Pion Production (RES), cont.Single Pion Production (RES), cont.
Besides resonances, a non-resonance background is to be added ( general problem!).
Relative normalization of contributions from different resonances is a problem, though 1232) 1232) dominates.
To avoid a double counting with DIS, the maximum mass of the bound πNπN state is to be defined – the WWcutcut.
We find Wcut = 1.4 GeV to be the best fit in our approach.
It's choice is a general problem as well. Experiments also present date for different Wcut from 1.1 GeV up to 2 GeV.
It will be discussed later.
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CFA-2015 76
Sensitivity of RES to MSensitivity of RES to MAA (CC 1) (CC 1)
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CFA-2015 77
Sensitivity of RES to MSensitivity of RES to MAA (CC 1) (CC 1)
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CFA-2015 78
Sensitivity of RES to MSensitivity of RES to MAA (CC 1) (CC 1)
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CFA-2015 79
Sensitivity of RES to MSensitivity of RES to MAA (CC 2) (CC 2)
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CFA-2015 80
Sensitivity of RES to MSensitivity of RES to MAA (CC 3) (CC 3)
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CFA-2015 81
Sensitivity of RES to MSensitivity of RES to MAA (NC ) (NC )
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CFA-2015 82
Sensitivity of CC RES to WSensitivity of CC RES to Wcutcut
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CFA-2015 83
Sensitivity of CC RES to WSensitivity of CC RES to Wcutcut
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CFA-2015 84
Sensitivity of CC RES to WSensitivity of CC RES to Wcutcut
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CFA-2015 85
RES off Oxygen TargetRES off Oxygen Target
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CFA-2015 86
Deep Inelastic ScatteringDeep Inelastic Scattering
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CFA-2015 87
Deep Inelastic ScatteringDeep Inelastic ScatteringMore than 2 + N in the final state.
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CFA-2015 88
Deep Inelastic ScatteringDeep Inelastic ScatteringMore than 2 + N in the final state.
DIS dominates at E (3 - 5) GeV.
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CFA-2015 89
Deep Inelastic ScatteringDeep Inelastic ScatteringMore than 2 + N in the final state.
DIS dominates at E (3 - 5) GeV.
While (Q)ES and RES cross-sections are constant at high energies due to constraint on Q2, DIS cross-sections grow with energy.
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CFA-2015 90
Deep Inelastic ScatteringDeep Inelastic ScatteringMore than 2 + N in the final state.
DIS dominates at E (3 - 5) GeV.
While (Q)ES and RES cross-sections are constant at high energies due to constraint on Q2, DIS cross-sections grow with energy.
For a q scattering on a quark at rest with
d σ
dQ 2=
GF2
π1
(1+Q2/MW
2)2
⇒ σ(S)=GF
2 MW2
πS
S+MW2
S≃2mq E
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CFA-2015 91
Deep Inelastic ScatteringDeep Inelastic ScatteringMore than 2 + N in the final state.
DIS dominates at E (3 - 5) GeV.
While (Q)ES and RES cross-sections are constant at high energies due to constraint on Q2, DIS cross-sections grow with energy.
For a q scattering on a quark at rest with
At ; at
d σ
dQ 2=
GF2
π1
(1+Q2/MW
2)2
⇒ σ(S)=GF
2 MW2
πS
S+MW2
S≃2mq E
S≪MW2
σ (E)∝E S≫MW2 σ (E)⇒σ0=
GF2 MW
2
π
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CFA-2015 92
Deep Inelastic ScatteringDeep Inelastic ScatteringMore than 2 + N in the final state.
DIS dominates at E (3 - 5) GeV.
While (Q)ES and RES cross-sections are constant at high energies due to constraint on Q2, DIS cross-sections grow with energy.
For a q scattering on a quark at rest with
At ; at
DIS is the sum of cross-sections on all quarks in a nucleon.
d σ
dQ 2=
GF2
π1
(1+Q2/MW
2)2
⇒ σ(S)=GF
2 MW2
πS
S+MW2
S≃2mq E
S≪MW2
σ (E)∝E S≫MW2 σ (E)⇒σ0=
GF2 MW
2
π
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CFA-2015 93
QCD and Structure FunctionsQCD and Structure Functions At LOLO of perturbative QCD nucleon consists of valence quarks, “sea”-quarks and gluons.
Sea quarks are qq-pairs.They arise from qg- and gg-interactions.
For unpolorized nucleons – 5 Sfs.
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CFA-2015 94
Nachtmann Variable
x
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CFA-2015 95
Extrapolations of SFs to small QExtrapolations of SFs to small Q22
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CFA-2015 96
Dependence of Dependence of NNCC DIS on WCC DIS on Wcutcut
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CFA-2015 97
Dependence of Dependence of NNCC DIS on WCC DIS on Wcutcut
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CFA-2015 98
Dependence of Dependence of NNC DIS on WC DIS on Wcutcut
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CFA-2015 99
Optimization of WOptimization of Wcut cut
for for NN
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CFA-2015 100
Optimization of WOptimization of Wcut cut
for for NN
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CFA-2015 101
Kinematic LimitsKinematic Limits
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CFA-2015 102
Kinematic Limits for CC DIS at E=5 GeVKinematic Limits for CC DIS at E=5 GeV
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CFA-2015 103
Kinematic Limits for CC DIS at E=10 GeVKinematic Limits for CC DIS at E=10 GeV
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CFA-2015 104
Kinematic Limits for NC DIS at E=10 GeVKinematic Limits for NC DIS at E=10 GeV
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CFA-2015 105
TMC SFs Dependence on x TMC SFs Dependence on x
PDF are from ABM-11ABM-11 and OPENQCDRAD OPENQCDRAD by Alekhin, Bluemlein, Moch.
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CFA-2015 106
Approach of Bodek&Yang Approach of Bodek&Yang
https://www.jlab.org/conferences/neutrino/talks/yang_uk.pdf
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CFA-2015 107
B&Y Pseudo NLOB&Y Pseudo NLO
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CFA-2015 108
2xF2xF11 and F and F
LL in B&Y Approach in B&Y Approach
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CFA-2015 109
Comparison of B&Y Model with ResonancesComparison of B&Y Model with Resonances
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CFA-2015 110
MC GeneratorsMC Generators Neutrino event generators available in the market.
NEUTNEUT – developed for Kamiokande and used by Super-Kamiokande, K2K, SciBooNE, T2K.
NUANCE NUANCE – developed for the IMB experiment and used by MiniBooNE.
NEUGENNEUGEN - developed for the SOUDAN and updated for MINOS.
ANISANIS – developed for AMANDA and used by IceCube.
General purpose MC generators
FLUKAFLUKA
GENIEGENIE – ArgoNeut, MicroBooNE, MINOS, MINERνA, T2K.Continuously updated.
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CFA-2015 111
GIBUUGIBUU – theorist group approach. It provides an unified transport framework at MeV - GeV energies. Numerous nuclear effects included.
NuWroNuWro - developed by the Wroclaw group. Accounts for the impact of nuclear effects on directly observable quantities with all the final state interactions included.
MC Generators, cont.MC Generators, cont.
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CFA-2015 112
Conclusions
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CFA-2015 113
ConclusionsAccurate account for neutrino-nucleon cross-sections is important.
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CFA-2015 114
ConclusionsAccurate account for neutrino-nucleon cross-sections is important.
Data are controversive and the choice for global fit needs serious expertise.
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CFA-2015 115
ConclusionsAccurate account for neutrino-nucleon cross-sections is important.
Data are controversive and the choice for global fit needs serious expertise.
With proposed set of models and parameters we fit the known data but at lowest energies.
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CFA-2015 116
ConclusionsAccurate account for neutrino-nucleon cross-sections is important.
Data are controversive and the choice for global fit needs serious expertise.
With proposed set of models and parameters we fit the known data but at lowest energies.
Uncertainties in the choice of axial masses and Wcut for RES and in extrapolations to small Q2 in DIS are correlated.
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CFA-2015 117
ConclusionsAccurate account for neutrino-nucleon cross-sections is important.
Data are controversive and the choice for global fit needs serious expertise.
With proposed set of models and parameters we fit the known data but at lowest energies.
Uncertainties in the choice of axial masses and Wcut for RES and in extrapolations to small Q2 in DIS are correlated.
An account for TMC, lepton mass, pQCD corrections are important.
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CFA-2015 118
ConclusionsAccurate account for neutrino-nucleon cross-sections is important.
Data are controversive and the choice for global fit needs serious expertise.
With proposed set of models and parameters we fit the known data but at lowest energies.
Uncertainties in the choice of axial masses and Wcut for RES and in extrapolations to small Q2 in DIS are correlated.
An account for TMC, lepton mass, pQCD corrections are important.
New precision data may change the set of parameters.
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CFA-2015 119
Thank you!
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CFA-2015 120
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CFA-2015 121
QES: from Strumia&VissaniQES: from Strumia&Vissani
ξ=k p−k n=3.706 where kp and k
n – anomalous magnetic moments in units
of nuclear magneton μN=e ℏ /2mp
fi and g
i are real function of t = -Q2. Approximation:
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CFA-2015 122