Measurement of single-diffractive dijet production in proton–proton collisions at $$\sqrt{s} = 8\,\text {Te}\text {V} $$ s = 8 Te with the CMS and TOTEM experiments
Name
10052_2020_Article_8562.pdf
Size
1.09 MB
Format
Adobe PDF
Checksum (MD5)
047738c06821ffd41b03d270539e770d
Author(s)
Sirunyan, A. M
Tumasyan, A.
Adam, W.
Ambrogi, F.
Asilar, E.
Bergauer, T.
Brandstetter, J.
Dragicevic, M.
Erö, J.
Valle, A. E D
Date Issued
December 17, 2020
Publisher
Springer Berlin Heidelberg
Citation
The European Physical Journal C. 2020 Dec 17;80(12):1164
Version
Final published version
Abstract
Abstract
Measurements are presented of the single-diffractive dijet cross section and the diffractive cross section as a function of the proton fractional momentum loss
$$\xi $$
ξ
and the four-momentum transfer squared t. Both processes
$${\text{ p }{}{}} {\text{ p }{}{}} \rightarrow {\text{ p }{}{}} {\text{ X }} $$
p
p
→
p
X
and
$${\text{ p }{}{}} {\text{ p }{}{}} \rightarrow {\text{ X }} {\text{ p }{}{}} $$
p
p
→
X
p
, i.e. with the proton scattering to either side of the interaction point, are measured, where
$${\text{ X }} $$
X
includes at least two jets; the results of the two processes are averaged. The analyses are based on data collected simultaneously with the CMS and TOTEM detectors at the LHC in proton–proton collisions at
$$\sqrt{s} = 8\,\text {Te}\text {V} $$
s
=
8
Te
during a dedicated run with
$$\beta ^{*} = 90\,\text {m} $$
β
∗
=
90
m
at low instantaneous luminosity and correspond to an integrated luminosity of
$$37.5{\,\text {nb}^{-1}} $$
37.5
nb
-
1
. The single-diffractive dijet cross section
$$\sigma ^{{\text{ p }{}{}} {\text{ X }}}_{\mathrm {jj}}$$
σ
jj
p
X
, in the kinematic region
$$\xi < 0.1$$
ξ
<
0.1
,
$$0.03< |t | < 1\,\text {Ge}\text {V} ^2$$
0.03
<
|
t
|
<
1
Ge
2
, with at least two jets with transverse momentum
$$p_{\mathrm {T}} > 40\,\text {Ge}\text {V} $$
p
T
>
40
Ge
, and pseudorapidity
$$|\eta | < 4.4$$
|
η
|
<
4.4
, is
$$21.7 \pm 0.9\,\text {(stat)} \,^{+3.0}_{-3.3}\,\text {(syst)} \pm 0.9\,\text {(lumi)} \,\text {nb} $$
21.7
±
0.9
(stat)
-
3.3
+
3.0
(syst)
±
0.9
(lumi)
nb
. The ratio of the single-diffractive to inclusive dijet yields, normalised per unit of
$$\xi $$
ξ
, is presented as a function of x, the longitudinal momentum fraction of the proton carried by the struck parton. The ratio in the kinematic region defined above, for x values in the range
$$-2.9 \le \log _{10} x \le -1.6$$
-
2.9
≤
log
10
x
≤
-
1.6
, is
$$R = (\sigma ^{{\text{ p }{}{}} {\text{ X }}}_{\mathrm {jj}}/\Delta \xi )/\sigma _{\mathrm {jj}} = 0.025 \pm 0.001\,\text {(stat)} \pm 0.003\,\text {(syst)} $$
R
=
(
σ
jj
p
X
/
Δ
ξ
)
/
σ
jj
=
0.025
±
0.001
(stat)
±
0.003
(syst)
, where
$$\sigma ^{{\text{ p }{}{}} {\text{ X }}}_{\mathrm {jj}}$$
σ
jj
p
X
and
$$\sigma _{\mathrm {jj}}$$
σ
jj
are the single-diffractive and inclusive dijet cross sections, respectively. The results are compared with predictions from models of diffractive and nondiffractive interactions. Monte Carlo predictions based on the HERA diffractive parton distribution functions agree well with the data when corrected for the effect of soft rescattering between the spectator partons.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Creative Commons Attribution
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1140/epjc/s10052-020-08562-y
