Measurements of long-range azimuthal anisotropies and associated Fourier coefficients for $pp$ collisions at $\sqrt{s}=5.02$ and $13$ TeV and $p$+Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV with the ATLAS detector
M. Aaboud
,
S. Albrand
(1)
,
S. Berlendis
(1)
,
A. Bethani
(1)
,
C. Camincher
(1)
,
J. Collot
(1)
,
S. Crépé-Renaudin
(1)
,
P.A. Delsart
(1)
,
C. Gabaldon
(1)
,
M.H. Genest
(1)
,
P.O.J. Gradin
(1)
,
J.Y. Hostachy
(1)
,
F. Ledroit-Guillon
(1)
,
A. Lleres
(1)
,
A. Lucotte
(1)
,
F. Malek
(1)
,
E. Petit
(1)
,
J. Stark
(1)
,
B. Trocmé
(1)
,
M. Wu
(1)
,
G. Rahal
(2)
,
N. Berger
(3)
,
M. Delmastro
(3)
,
L. Di Ciaccio
(3)
,
S. Elles
(3)
,
K. Grevtsov
(3)
,
T. Guillemin
(3)
,
T. Hryn’ova
(3)
,
S. Jézéquel
(3)
,
I. Koletsou
(3)
,
R. Lafaye
(3)
,
Jérémy Lévêque
(3)
,
P. Mastrandea
(3)
,
E. Sauvan
(3)
,
B.H. Smart
(3)
,
T. Todorov
(3)
,
I. Wingerter-Seez
(3)
,
E. Yatsenko
(3)
M. Aaboud
- Fonction : Auteur
S. Crépé-Renaudin
- Fonction : Auteur
- PersonId : 742348
- IdHAL : sabine-crepe
- ORCID : 0000-0001-5980-5805
- IdRef : 118947249
M.H. Genest
- Fonction : Auteur
- PersonId : 735684
- IdHAL : marie-helene-genest
- ORCID : 0000-0002-4098-2024
- IdRef : 191694142
F. Ledroit-Guillon
- Fonction : Auteur
- PersonId : 738735
- IdHAL : fabienne-ledroit
- ORCID : 0000-0001-9398-1909
- IdRef : 137343809
F. Malek
- Fonction : Auteur
- PersonId : 21915
- IdHAL : fairouz-malek
- ORCID : 0000-0002-0948-5775
- IdRef : 084171219
B. Trocmé
- Fonction : Auteur
- PersonId : 14773
- IdHAL : benjamin-trocme
- ORCID : 0000-0001-9500-2487
- IdRef : 139039872
N. Berger
- Fonction : Auteur
- PersonId : 741762
- IdHAL : nicolas-berger
T. Hryn’ova
- Fonction : Auteur
- PersonId : 178920
- IdHAL : thrynova
- ORCID : 0000-0001-5914-8614
- IdRef : 253167418
S. Jézéquel
- Fonction : Auteur
- PersonId : 739301
- IdHAL : stephane-jezequel
- ORCID : 0000-0001-7369-6975
- IdRef : 074440926
Résumé
ATLAS measurements of two-particle correlations are presented for $\sqrt{s} = 5.02$ and $13$ TeV $pp$ collisions and for $\sqrt{s_{\mathrm{NN}}} = 5.02$ TeV $p$+Pb collisions at the LHC. The correlation functions are measured as a function of relative azimuthal angle $\Delta \phi$, and pseudorapidity separation $\Delta \eta$, using charged particles detected within the pseudorapidity interval $|\eta|{<}2.5$. Azimuthal modulation in the long-range component of the correlation function, with $|\Delta\eta|{>}2$, is studied using a template fitting procedure to remove a "back-to-back" contribution to the correlation function that primarily arises from hard-scattering processes. In addition to the elliptic, $\cos{(2\Delta\phi)}$, modulation observed in a previous measurement, the $pp$ correlation functions exhibit significant $\cos{(3\Delta\phi)}$ and $\cos{(4\Delta\phi)}$ modulation. The Fourier coefficients $v_{n,n}$ associated with the $\cos{(n\Delta\phi)}$ modulation of the correlation functions for $n =$ $2$--$4$ are measured as a function of charged-particle multiplicity and charged-particle transverse momentum. The Fourier coefficients are observed to be compatible with $\cos{(n\phi)}$ modulation of per-event single-particle azimuthal angle distributions. The single-particle Fourier coefficients $v_n$ are measured as a function of charged-particle multiplicity, and charged-particle transverse momentum for $n {=} $ $2$--$4$. The integrated luminosities used in this analysis are, $64$ $\mathrm{nb^{-1}}$ for the $\sqrt{s}=13$ TeV $pp$ data, $170$ $\mathrm{nb^{-1}}$ for the $\sqrt{s}=5.02$ TeV $pp$ data and $28$ $\mathrm{nb^{-1}}$ for the $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV $p$+Pb data.