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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.


Q2 (negative four-momentum transfer squared)

5 × 41 GeV10 × 100 GeV18 × 275 GeV
Q2Q2Q2
Q² distributionQ² distributionQ² distribution

xBj (Bjorken x)

5 × 41 GeV10 × 100 GeV18 × 275 GeV
xBjxBjxBj
Bjorken-xBjorken-xBjorken-x

q2 – negative four‑momentum transfer squared

5×4110×10018×275
Q²Q²Q²
Q^2 distributionQ^2 distributionQ^2 distribution

xbj – Bjorken‑x

5×4110×10018×275
xathrm{Bj}xathrm{Bj}xathrm{Bj}
Bjorken‑xBjorken‑xBjorken‑x
5 × 41 GeV10 × 100 GeV18 × 275 GeV
y_dy_dy_d
Inelasticity yInelasticity yInelasticity y
5×4110×10018×275
xdxdxd
Rescaled x to account for ion massRescaled xRescaled x

Y+ (1 + (1 − y)2)

5×4110×10018×275
ydydyd
Inelasticity y (ion frame)Inelasticity yInelasticity y

yplus – 1+(1-y)^2

5×4110×10018×275
Y^+Y^+Y^+
1+(1-y)^2 factor1+(1-y)^2 factor1+(1-y)^2 factor

nu – energy transfer

5×4110×10018×275
uuu
Energy transfer \nuEnergy transfer \nuEnergy transfer \nu

W (invariant hadronic mass)

twopdotk – ion–electron scalar product

5×4110×10018×275
2P·k2P·k2P·k
2,P!\cdot k2,P!\cdot k2,P!\cdot k

MX2 (missing-mass squared)

5×4110×10018×275
sesese
s_s_s_

αS (light-cone momentum fraction)

twopdotq - 2P dot q

5×4110×10018×275
2P·q2P·q2P·q
2,P!\cdot q2,P!\cdot q2,P!\cdot q

s_q – CM‑energy squared (ion + gamma*)

5×4110×10018×275
sqsqsq
s_s_s_

tspectator (momentum transfer to spectator)

mx2 – squared missing mass

5×4110×10018×275
MX²MX²MX²
M_X^2M_X^2M_X^2

t′ (excess above tmin)

5×4110×10018×275
WWW
WWW

2 P·k (two-body scalar product)

alphas – light‑cone momentum fraction

5×4110×10018×275
alphaSalphaSalphaS
\alpha_S\alpha_S\alpha_S

pperps – transverse momentum of the spectator

5×4110×10018×275
perpperpperp
p_{\perp S}p_{\perp S}p_{\perp S}

tspectator – momentum transfer to spectator

5×4110×10018×275
ttt
t_{\text{spectator}}t_{\text{spectator}}t_{\text{spectator}}

tprime – excess above t_{\min}

5×4110×10018×275
t't't'
t' = t - t_{\min}t't'

sq (γ*–ion CM energy squared)

5 × 41 GeV10 × 100 GeV18 × 275 GeV
s_qs_qs_q
sqsqsq

Released under the MIT License.