Two-particle azimuthal correlations in γp interactions using pPb collisions at sNN=8.16TeV

CMS Collaboration

doi:10.1016/j.physletb.2023.137905

Two-particle azimuthal correlations in γp interactions using pPb collisions at s_{_NN}=8.16TeV

CMS Collaboration

CERN
A. Alikhanian Yerevan Institute of Physics
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Vrije Universiteit Brussel
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21 Citas (Scopus)

Resumen

The first measurements of the Fourier coefficients (V_nΔ) of the azimuthal distributions of charged hadrons emitted from photon-proton (γp) interactions are presented. The data are extracted from 68.8 nb⁻¹ of ultra-peripheral proton-lead (pPb) collisions at s_{_NN}=8.16TeV using the CMS detector. The high energy lead ions produce a flux of photons that can interact with the oncoming proton. This γp system provides a set of unique initial conditions with multiplicity lower than in photon-lead collisions but comparable to recent electron-positron and electron-proton data. The V_nΔ coefficients are presented in ranges of event multiplicity and transverse momentum (p_T) and are compared to corresponding hadronic minimum bias pPb results. For a given multiplicity range, the mean p_T of charged particles is smaller in γp than in pPb collisions. For both the γp and pPb samples, V_1Δ is negative, V_2Δ is positive, and V_3Δ consistent with 0. For each multiplicity and p_T range, V_2Δ is larger for γp events. The γp data are consistent with model predictions that have no collective effects.

Idioma original	Inglés
Número de artículo	137905
Publicación	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volumen	844
DOI	https://doi.org/10.1016/j.physletb.2023.137905
Estado	Publicada - 10 sept 2023
Publicado de forma externa	Sí

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title = "Two-particle azimuthal correlations in γp interactions using pPb collisions at sNN=8.16TeV",

abstract = "The first measurements of the Fourier coefficients (VnΔ) of the azimuthal distributions of charged hadrons emitted from photon-proton (γp) interactions are presented. The data are extracted from 68.8 nb−1 of ultra-peripheral proton-lead (pPb) collisions at sNN=8.16TeV using the CMS detector. The high energy lead ions produce a flux of photons that can interact with the oncoming proton. This γp system provides a set of unique initial conditions with multiplicity lower than in photon-lead collisions but comparable to recent electron-positron and electron-proton data. The VnΔ coefficients are presented in ranges of event multiplicity and transverse momentum (pT) and are compared to corresponding hadronic minimum bias pPb results. For a given multiplicity range, the mean pT of charged particles is smaller in γp than in pPb collisions. For both the γp and pPb samples, V1Δ is negative, V2Δ is positive, and V3Δ consistent with 0. For each multiplicity and pT range, V2Δ is larger for γp events. The γp data are consistent with model predictions that have no collective effects.",

keywords = "CMS, Collectivity, Photon-proton",

author = "A. Tumasyan and W. Adam and T. Bergauer and M. Dragicevic and \{Escalante Del Valle\}, A. and R. Fr{\"u}hwirth and M. Jeitler and N. Krammer and L. Lechner and D. Liko and I. Mikulec and Pitters, \{F. M.\} and N. Rad and J. Schieck and R. Sch{\"o}fbeck and M. Spanring and S. Templ and W. Waltenberger and Wulz, \{C. E.\} and M. Zarucki and Darwish, \{M. R.\} and \{De Wolf\}, \{E. A.\} and T. Janssen and T. Kello and A. Lelek and M. Pieters and \{Rejeb Sfar\}, H. and \{Van Mechelen\}, P. and \{Van Putte\}, S. and \{Van Remortel\}, N. and F. Blekman and Bols, \{E. S.\} and Chhibra, \{S. S.\} and J. D'Hondt and \{De Clercq\}, J. and D. Lontkovskyi and S. Lowette and I. Marchesini and S. Moortgat and A. Morton and D. M{\"u}ller and Q. Python and S. Tavernier and \{Van Doninck\}, W. and \{Van Mulders\}, P. and D. Beghin and B. Bilin and B. Clerbaux and \{De Lentdecker\}, G. and S. Thakur and \{CMS Collaboration\}",

note = "Publisher Copyright: {\textcopyright} 2023 The Author(s)",

year = "2023",

month = sep,

day = "10",

doi = "10.1016/j.physletb.2023.137905",

language = "English",

volume = "844",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

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TY - JOUR

T1 - Two-particle azimuthal correlations in γp interactions using pPb collisions at sNN=8.16TeV

AU - Tumasyan, A.

AU - Adam, W.

AU - Bergauer, T.

AU - Dragicevic, M.

AU - Escalante Del Valle, A.

AU - Frühwirth, R.

AU - Jeitler, M.

AU - Krammer, N.

AU - Lechner, L.

AU - Liko, D.

AU - Mikulec, I.

AU - Pitters, F. M.

AU - Rad, N.

AU - Schieck, J.

AU - Schöfbeck, R.

AU - Spanring, M.

AU - Templ, S.

AU - Waltenberger, W.

AU - Wulz, C. E.

AU - Zarucki, M.

AU - Darwish, M. R.

AU - De Wolf, E. A.

AU - Janssen, T.

AU - Kello, T.

AU - Lelek, A.

AU - Pieters, M.

AU - Rejeb Sfar, H.

AU - Van Mechelen, P.

AU - Van Putte, S.

AU - Van Remortel, N.

AU - Blekman, F.

AU - Bols, E. S.

AU - Chhibra, S. S.

AU - D'Hondt, J.

AU - De Clercq, J.

AU - Lontkovskyi, D.

AU - Lowette, S.

AU - Marchesini, I.

AU - Moortgat, S.

AU - Morton, A.

AU - Müller, D.

AU - Python, Q.

AU - Tavernier, S.

AU - Van Doninck, W.

AU - Van Mulders, P.

AU - Beghin, D.

AU - Bilin, B.

AU - Clerbaux, B.

AU - De Lentdecker, G.

AU - Thakur, S.

AU - CMS Collaboration

PY - 2023/9/10

Y1 - 2023/9/10

N2 - The first measurements of the Fourier coefficients (VnΔ) of the azimuthal distributions of charged hadrons emitted from photon-proton (γp) interactions are presented. The data are extracted from 68.8 nb−1 of ultra-peripheral proton-lead (pPb) collisions at sNN=8.16TeV using the CMS detector. The high energy lead ions produce a flux of photons that can interact with the oncoming proton. This γp system provides a set of unique initial conditions with multiplicity lower than in photon-lead collisions but comparable to recent electron-positron and electron-proton data. The VnΔ coefficients are presented in ranges of event multiplicity and transverse momentum (pT) and are compared to corresponding hadronic minimum bias pPb results. For a given multiplicity range, the mean pT of charged particles is smaller in γp than in pPb collisions. For both the γp and pPb samples, V1Δ is negative, V2Δ is positive, and V3Δ consistent with 0. For each multiplicity and pT range, V2Δ is larger for γp events. The γp data are consistent with model predictions that have no collective effects.

AB - The first measurements of the Fourier coefficients (VnΔ) of the azimuthal distributions of charged hadrons emitted from photon-proton (γp) interactions are presented. The data are extracted from 68.8 nb−1 of ultra-peripheral proton-lead (pPb) collisions at sNN=8.16TeV using the CMS detector. The high energy lead ions produce a flux of photons that can interact with the oncoming proton. This γp system provides a set of unique initial conditions with multiplicity lower than in photon-lead collisions but comparable to recent electron-positron and electron-proton data. The VnΔ coefficients are presented in ranges of event multiplicity and transverse momentum (pT) and are compared to corresponding hadronic minimum bias pPb results. For a given multiplicity range, the mean pT of charged particles is smaller in γp than in pPb collisions. For both the γp and pPb samples, V1Δ is negative, V2Δ is positive, and V3Δ consistent with 0. For each multiplicity and pT range, V2Δ is larger for γp events. The γp data are consistent with model predictions that have no collective effects.

KW - CMS

KW - Collectivity

KW - Photon-proton

UR - https://www.scopus.com/pages/publications/85168004410

U2 - 10.1016/j.physletb.2023.137905

DO - 10.1016/j.physletb.2023.137905

M3 - Article

AN - SCOPUS:85168004410

SN - 0370-2693

VL - 844

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

M1 - 137905