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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.
All image links are absolute (/analysis/...) so they render correctly in VitePress.

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Q2 (negative four-momentum transfer squared)

5 × 41 GeV	10 × 100 GeV	18 × 275 GeV
Q² distribution	Q² distribution	Q² distribution

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x_Bj (Bjorken x)

5 × 41 GeV	10 × 100 GeV	18 × 275 GeV
Bjorken-x	Bjorken-x	Bjorken-x

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q2 – negative four‑momentum transfer squared

5×41	10×100	18×275
Q^2 distribution	Q^2 distribution	Q^2 distribution

xbj – Bjorken‑x

5×41	10×100	18×275
Bjorken‑x	Bjorken‑x	Bjorken‑x

5 × 41 GeV	10 × 100 GeV	18 × 275 GeV
Inelasticity y	Inelasticity y	Inelasticity y

5×41	10×100	18×275
Rescaled x to account for ion mass	Rescaled x	Rescaled x

Y₊ (1 + (1 − y)²)

5×41	10×100	18×275
Inelasticity y (ion frame)	Inelasticity y	Inelasticity y

yplus – 1+(1-y)^2

5×41	10×100	18×275
1+(1-y)^2 factor	1+(1-y)^2 factor	1+(1-y)^2 factor

nu – energy transfer

5×41	10×100	18×275
Energy transfer \nu	Energy transfer \nu	Energy transfer \nu

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W (invariant hadronic mass)

twopdotk – ion–electron scalar product

5×41	10×100	18×275
2,P!\cdot k	2,P!\cdot k	2,P!\cdot k

M_X² (missing-mass squared)

5×41	10×100	18×275
s_	s_	s_

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α_S (light-cone momentum fraction)

twopdotq - 2P dot q

5×41	10×100	18×275
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
s_	s_	s_

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t_spectator (momentum transfer to spectator)

mx2 – squared missing mass

5×41	10×100	18×275
M_X^2	M_X^2	M_X^2

t′ (excess above t_min)

5×41	10×100	18×275
W	W	W

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2 P·k (two-body scalar product)

alphas – light‑cone momentum fraction

5×41	10×100	18×275
\alpha_S	\alpha_S	\alpha_S

pperps – transverse momentum of the spectator

5×41	10×100	18×275
p_{\perp S}	p_{\perp S}	p_{\perp S}

tspectator – momentum transfer to spectator

5×41	10×100	18×275
t_{\text{spectator}}	t_{\text{spectator}}	t_{\text{spectator}}

tprime – excess above t_{\min}

5×41	10×100	18×275
t' = t - t_{\min}	t'	t'

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s_q (γ*–ion CM energy squared)

5 × 41 GeV	10 × 100 GeV	18 × 275 GeV
sq	sq	sq