Measurement of exclusive $${{{\uprho _{}^{}} _{}^{}}{{\left( {770}\right) }{}_{}^{}}} ^{0}$$ ρ 770 0 photoproduction in ultraperipheral pPb collisions at $$\sqrt{\smash [b]{s_{_{\mathrm {NN}}}}} = 5.02\,\text {Te}\text {V} $$ s NN = 5.02 Te
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Author(s)
Sirunyan, A. M
Tumasyan, A.
Adam, W.
Ambrogi, F.
Asilar, E.
Bergauer, T.
Brandstetter, J.
Dragicevic, M.
Erö, J.
Del Valle, A. E
Date Issued
August 21, 2019
Publisher
Springer Berlin Heidelberg
Citation
The European Physical Journal C. 2019 Aug 21;79(8):702
Version
Final published version
Abstract
Abstract
Exclusive
$${{{\uprho _{}^{}} _{}^{}}{{\left( {770}\right) }{}_{}^{}}} ^{0}$$
ρ
770
0
photoproduction is measured for the first time in ultraperipheral pPb collisions at
$$\sqrt{\smash [b]{s_{_{\mathrm {NN}}}}} = 5.02\,\text {Te}\text {V} $$
s
NN
=
5.02
Te
with the CMS detector. The cross section
$$\sigma ({\upgamma _{}^{}} \mathrm{p}\rightarrow {{{\uprho _{}^{}} _{}^{}}{{\left( {770}\right) }{}_{}^{}}} ^{0}\mathrm{p})$$
σ
(
γ
p
→
ρ
770
0
p
)
is
$$11.0 \pm 1.4\,\text {(stat)} \pm 1.0\,\text {(syst)} $$
11.0
±
1.4
(stat)
±
1.0
(syst)
$$\mu $$
μ
b at
$$\langle W_{{\upgamma _{}^{}} \mathrm{p}}\rangle = 92.6\,\text {Ge}\text {V} $$
⟨
W
γ
p
⟩
=
92.6
Ge
for photon–proton centre-of-mass energies
$$W_{{\upgamma _{}^{}} \mathrm{p}}$$
W
γ
p
between 29 and
$$213\,\text {Ge}\text {V} $$
213
Ge
. The differential cross section
$$\mathrm {d}\sigma /\mathrm {d}|t |$$
d
σ
/
d
|
t
|
is measured in the interval
$$0.025< |t | < 1\,\text {Ge}\text {V} ^{2}$$
0.025
<
|
t
|
<
1
Ge
2
as a function of
$$W_{{\upgamma _{}^{}} \mathrm{p}}$$
W
γ
p
, where t is the squared four-momentum transfer at the proton vertex. The results are compared with previous measurements and theoretical predictions. The measured cross section
$$\sigma ({\upgamma _{}^{}} \mathrm{p}\rightarrow {{{\uprho _{}^{}} _{}^{}}{{\left( {770}\right) }{}_{}^{}}} ^{0}\mathrm{p})$$
σ
(
γ
p
→
ρ
770
0
p
)
has a power-law dependence on the photon–proton centre-of-mass, consistent with electron–proton collision measurements performed at HERA. The
$$W_{{\upgamma _{}^{}} \mathrm{p}}$$
W
γ
p
dependence of the exponential slope of the differential cross section
$$\mathrm {d}\sigma /\mathrm {d}|t |$$
d
σ
/
d
|
t
|
is also measured.
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/s10052-019-7202-9
