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Event Kinematics
Below you will find side-by-side comparisons of every DIS kinematic variable for the three beam-energy settings 5 × 41 GeV, 10 × 100 GeV, and 18 × 275 GeV.
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Q2 (negative four-momentum transfer squared)
5 × 41 GeV | 10 × 100 GeV | 18 × 275 GeV |
---|---|---|
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Q² distribution | Q² distribution | Q² distribution |
xBj (Bjorken x)
5 × 41 GeV | 10 × 100 GeV | 18 × 275 GeV |
---|---|---|
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Bjorken-x | Bjorken-x | Bjorken-x |
q2 – negative four‑momentum transfer squared
5×41 | 10×100 | 18×275 |
---|---|---|
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Q^2 distribution | Q^2 distribution | Q^2 distribution |
xbj – Bjorken‑x
5×41 | 10×100 | 18×275 |
---|---|---|
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Bjorken‑x | Bjorken‑x | Bjorken‑x |
5 × 41 GeV | 10 × 100 GeV | 18 × 275 GeV |
---|---|---|
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Inelasticity y | Inelasticity y | Inelasticity y |
5×41 | 10×100 | 18×275 |
---|---|---|
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Rescaled x to account for ion mass | Rescaled x | Rescaled x |
Y+ (1 + (1 − y)2)
5×41 | 10×100 | 18×275 |
---|---|---|
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Inelasticity y (ion frame) | Inelasticity y | Inelasticity y |
yplus – 1+(1-y)^2
5×41 | 10×100 | 18×275 |
---|---|---|
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1+(1-y)^2 factor | 1+(1-y)^2 factor | 1+(1-y)^2 factor |
nu – energy transfer
5×41 | 10×100 | 18×275 |
---|---|---|
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Energy transfer \nu | Energy transfer \nu | Energy transfer \nu |
W (invariant hadronic mass)
twopdotk – ion–electron scalar product
5×41 | 10×100 | 18×275 |
---|---|---|
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2,P!\cdot k | 2,P!\cdot k | 2,P!\cdot k |
MX2 (missing-mass squared)
5×41 | 10×100 | 18×275 |
---|---|---|
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s_ | s_ | s_ |
αS (light-cone momentum fraction)
twopdotq - 2P dot q
5×41 | 10×100 | 18×275 |
---|---|---|
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2,P!\cdot q | 2,P!\cdot q | 2,P!\cdot q |
s_q – CM‑energy squared (ion + gamma*)
5×41 | 10×100 | 18×275 |
---|---|---|
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s_ | s_ | s_ |
tspectator (momentum transfer to spectator)
mx2 – squared missing mass
5×41 | 10×100 | 18×275 |
---|---|---|
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M_X^2 | M_X^2 | M_X^2 |
t′ (excess above tmin)
5×41 | 10×100 | 18×275 |
---|---|---|
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W | W | W |
2 P·k (two-body scalar product)
alphas – light‑cone momentum fraction
5×41 | 10×100 | 18×275 |
---|---|---|
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\alpha_S | \alpha_S | \alpha_S |
pperps – transverse momentum of the spectator
5×41 | 10×100 | 18×275 |
---|---|---|
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p_{\perp S} | p_{\perp S} | p_{\perp S} |
tspectator – momentum transfer to spectator
5×41 | 10×100 | 18×275 |
---|---|---|
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t_{\text{spectator}} | t_{\text{spectator}} | t_{\text{spectator}} |
tprime – excess above t_{\min}
5×41 | 10×100 | 18×275 |
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t' = t - t_{\min} | t' | t' |
sq (γ*–ion CM energy squared)
5 × 41 GeV | 10 × 100 GeV | 18 × 275 GeV |
---|---|---|
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sq | sq | sq |