Strong Interaction Physics with 22 GeV Electrons at JLab
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Inclusive Data - JLab @22 GeV
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Symposium: Nucleon and nuclei structure from inclusive measurements
June 20 -21, 2023
Strong Interaction Physics at the Luminosity Frontier with 22 GeV Electrons at Jefferson Lab
arXiv:2306.09360
Unpolarized structure functions
F
1
(x,Q
2
)
and
F
2
(x,Q
2
)
, or
F
T
(x,Q
2
)
[=
2xF
1
(x,Q
2
)
]
and
F
L
(x,Q
2
)
, separated by measuring
R =
L
/
T
Q
2
:
Four-momentum transfer
x :
Bjorken variable (=Q
2
/2M
)
:
Energy transfer
M :
Nucleon mass
W :
Final state hadronic mass
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–
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9/24/2024
F. Olness: Anti-Shadowing and Nuclear PDF Challenges
JLab High Energy Workshop Series 22-23 July 2022
A. Accardi et al: Electron Ion Collider: The Next QCD Frontier
- Understanding the glue that binds us all
9/24/2024
https://ncteq.hepforge.org
/
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9/24/2024
nCTEQ15HIX — Extending nPDF Analyses into the High-x, Low-Q2 Region,
E.P. Segarra
et al.,
Phys. Rev. D 103, 114015 (2021)
He, Be, Li, C, N, Al, Ca, Fe, Cu, Kr, Ag, Sn, Xe, Au, Pb
Hall C Data at 12 GeV:
E12-06-105 and E12-10-008
H
e
-
4
,
C
-
1
2
9/24/2024
E
Beam
= 22 GeV
SHMS at various angles
SHMS momenta = 0.5 - 11 GeV/c
F
e
-
5
6
a
n
d
A
u
-
1
9
7
9/24/2024
“Jlab 22 will provide definitive proof of three-nucleon short-range correlations by verifying the
existence of the new nuclear scaling at x > 2 and Q
2
= 10 - 15 GeV
2
in inclusive e − A scattering” -
arXiv:2306.09360
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p
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R
V. Guzey et al, PRC 86 045201 (2012)
F
1
ratio purely transverse
Anti-shadowing disappears for
F
1
ratio,
remains for
F
2
Anti-shadowing from longitudinal photons?
D. Gaskell
K
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m
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9/24/2024
Beam energy: 2.85---22.65 in 10 steps (so 2.2 GeV per turn, 1.1 GeV per LINAC)
Spectrometer limits:
HMS
p: 0.5—7 GeV
theta: 10.5—80 deg.
SHMS
p: 1—11 GeV
theta: 5.5—40 deg.
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:
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p
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9/24/2024
9/24/2024
Bigger
Δε
: need
backward angles
9/24/2024
-
F2ALLM for deuterium
- r1998
- solid angle: 4 msr
- p limits: -10--10%
- beam current: 10 uA
- tgt length: 4 cm
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)
SHMS at 5.5 degrees
Radiative Corrections
SHMS at 30 degrees
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9/24/2024
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9/24/2024
Backup slides
9/24/2024
Super-fast quarks
E
1
2
-
0
6
-
1
0
5
:
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N. Fomin et al, PRL 105, 212502 (2010)
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two-nucleon only
two-nucleon only
5% 6 quark bag
5% 6 quark bag
Signatures of super-fast quarks
q
D
(x)
D
i
f
f
e
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~
1
%
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f
f
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c
t
?
6q bag is ‘shorthand’ for any model where nucleon overlap allows
free sharing of quark momentum (e.g. hard gluon exchange)
Yields
very large
enhancement over simple convolution for x>1
Signatures of super-fast quarks
Convolution, hard gluon exchange, 6q
bag – all yield
enhancement
Misak Sargsian and Christian Weiss
R
~
F
2
t
a
g
g
e
d
/
F
2
u
n
t
a
g
g
e
d
Projected uncertainties
From E12-11-10:
Various models (PLC suppression, rescaling, off-shell) yield
suppression in tagged scattering for large nucleon momenta,
large x
F
2
suppressed
for x>1
Resonance contamination will limit precision;
need larger energy to cleanly isolate DIS.
But models predict large effects, from factor
~2 suppression to factor ~10+ enhancement.
Evaluation of models for inclusive F
2
in
progress: Sargsian, Li, Arrington
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SHMS at 10 degrees
Investigate the nucleon and nuclei structure through inclusive electron scattering at 22 GeV, delving into formalisms and structure functions. Discussions on the Electron Ion Collider, nuclear PDFs, world data comparisons, and definitive proof of three-nucleon short-range correlations at Jefferson Lab. Nuclear dependence of R and anti-shadowing effects examined with insights into transverse and longitudinal photons.
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Presentation Transcript
Inclusive Data - JLab @22 GeV IOANA NICULESCU IOANA NICULESCU JAMES MADISON UNIVERSITY JAMES MADISON UNIVERSITY Strong Interaction Physics at the Luminosity Frontier with 22 GeV Electrons at Jefferson Lab arXiv:2306.09360 Symposium: Nucleon and nuclei structure from inclusive measurements June 20 -21, 2023
Inclusive Electron Scattering Inclusive Electron Scattering Formalism Formalism Q2 : Four-momentum transfer x : Bjorken variable (=Q2/2M ) : Energy transfer M : Nucleon mass W : Final state hadronic mass Unpolarized structure functions F1(x,Q2)and F2(x,Q2), or FT(x,Q2) [=2xF1(x,Q2)]and FL(x,Q2), separated by measuring R = L/ T
????,?2 ?????,?2 ???,?2= A. Accardi et al: Electron Ion Collider: The Next QCD Frontier - Understanding the glue that binds us all (arXiv:1212.1701) F. Olness: Anti-Shadowing and Nuclear PDF Challenges JLab High Energy Workshop Series 22-23 July 2022 9/24/2024
https://ncteq.hepforge.org/ Nuclear PDFs Nuclear PDFs 9/24/2024
World Data: BCDMS, EMC, NMC, SLAC, FNAL, Hermes, World Data: BCDMS, EMC, NMC, SLAC, FNAL, Hermes, JLab JLab He, Be, Li, C, N, Al, Ca, Fe, Cu, Kr, Ag, Sn, Xe, Au, Pb Hall C Data at 12 GeV: E12-06-105 and E12-10-008 nCTEQ15HIX Extending nPDF Analyses into the High-x, Low-Q2 Region, E.P. Segarra et al., Phys. Rev. D 103, 114015 (2021) 9/24/2024
He He- -4, C 4, C- -12 12 EBeam = 22 GeV SHMS at various angles SHMS momenta = 0.5 - 11 GeV/c ? = 30 ? = 20 ? = 10 9/24/2024
Fe Fe- -56 and Au 56 and Au- -197 197 Jlab 22 will provide definitive proof of three-nucleon short-range correlations by verifying the existence of the new nuclear scaling at x > 2 and Q2= 10 - 15 GeV2in inclusive e A scattering - arXiv:2306.09360 9/24/2024
Nuclear Dependence of R Nuclear Dependence of R D. Gaskell F1 ratio purely transverse Anti-shadowing disappears for F1ratio, remains for F2 Anti-shadowing from longitudinal photons? V. Guzey et al, PRC 86 045201 (2012)
Kinematics coverage Kinematics coverage Beam energy: 2.85---22.65 in 10 steps (so 2.2 GeV per turn, 1.1 GeV per LINAC) Spectrometer limits: HMS p: 0.5 7 GeV theta: 10.5 80 deg. SHMS p: 1 11 GeV theta: 5.5 40 deg. 9/24/2024
Extracting R: LT separation Extracting R: LT separation 9/24/2024
Bigger : need backward angles 9/24/2024
Rates Rates - F2ALLM for deuterium - r1998 - solid angle: 4 msr - p limits: -10--10% - beam current: 10 uA - tgt length: 4 cm 9/24/2024
Challenges: Radiative Corrections Challenges: Radiative Corrections (calculations by D. Gaskell) (calculations by D. Gaskell) SHMS at 5.5 degrees Total RC factor Ratio of radiated QE/total cross sections Ratio of radiated elastic/total cross sections
Radiative Corrections SHMS at 30 degrees
Challenges: Charge Symmetric Background Challenges: Charge Symmetric Background (calculations by G. Niculescu using P. (calculations by G. Niculescu using P. Bosted Bosted code) code) 9/24/2024
Outlook Outlook Higher energy will expand the kinematic regime High statistics measurements from fixed target experiments will complement EIC measurements. Measurements of ??: help extract gluon in nuclear PDFs JLab/EIC overlap will provide important validation JLab has a uniquely fundamental role to play in the EIC era in the realm of precision separation measurements between the longitudinal ( L) and transverse ( T ) photon contributions to the cross section, which are critical for studies of both semi-inclusive and exclusive processes. - arXiv:2306.09360 9/24/2024
Backup slides 9/24/2024
Super-fast quarks 6 GeV data at high x, Q2 up to 10 GeV2, shows QCD scaling-like behavior despite large resonance contributions (duality) E12-06-105: inclusive scattering at x>1: SRCs and SFQs [J. Arrington, D. Day, N. Fomin] Currently running in Hall C SFQs: Inclusive scattering at x>1 to isolate SRCs Push to larger Q2 to study quark distributions N. Fomin et al, PRL 105, 212502 (2010) 12 GeV measurement reaches Q2=15 GeV2, with smaller resonance contributions 2N- and 3N-SRCs
Signatures of super-fast quarks two-nucleon only 5% 6 quark bag two-nucleon only 5% 6 quark bag qD(x) Difference only ~1% piece of EMC effect? 6q bag is shorthand for any model where nucleon overlap allows free sharing of quark momentum (e.g. hard gluon exchange) Yields very large enhancement over simple convolution for x>1
Signatures of super-fast quarks From E12-11-10: R ~ F2tagged/F2untagged Convolution, hard gluon exchange, 6q bag all yield enhancement Projected uncertainties Misak Sargsian and Christian Weiss aS=(ES- pS Z)/mS Resonance contamination will limit precision; need larger energy to cleanly isolate DIS. But models predict large effects, from factor ~2 suppression to factor ~10+ enhancement. Various models (PLC suppression, rescaling, off-shell) yield suppression in tagged scattering for large nucleon momenta, large x F2suppressed for x>1 Evaluation of models for inclusive F2 in progress: Sargsian, Li, Arrington
Radiative Corrections Radiative Corrections SHMS at 10 degrees
