Probing Gluon Fluctuations in Nuclei with the First Energy-Dependent Measurement of Incoherent (Formula presented) Photoproduction in Ultraperipheral PbPb Collisions

CMS Collaboration

doi:10.1103/w9kp-f8xr

Probing Gluon Fluctuations in Nuclei with the First Energy-Dependent Measurement of Incoherent (Formula presented) Photoproduction in Ultraperipheral PbPb Collisions

CMS Collaboration

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3 引用（Scopus）

摘要

Incoherent (Formula presented) photoproduction in heavy ion ultraperipheral collisions (UPCs) provides a sensitive probe of localized, fluctuating gluonic structures within heavy nuclei. This Letter reports the first measurement of the photon-nucleon center-of-mass energy ((Formula presented)) dependence of this process in PbPb UPCs at a nucleon-nucleon center-of-mass energy of 5.02 TeV, using (Formula presented) of data recorded by the CMS experiment. The measurement covers a wide (Formula presented) range of (Formula presented), probing gluons carrying a fraction (Formula presented) of nucleon momentum down to an unexplored regime of (Formula presented). Compared to baseline predictions neglecting nuclear effects, the measured cross sections exhibit significantly greater suppression at lower (Formula presented). Additionally, the ratio of incoherent to coherent photoproduction is found to be constant across the probed (Formula presented) and (Formula presented) range, disfavoring the establishment of the black disk limit. This Letter provides critical insights into the (Formula presented)-dependent evolution of fluctuating gluonic structures within nuclei and calls for further advancements in theoretical models incorporating nuclear shadowing and gluon saturation.

源语言	英语
文章编号	112301
期刊	Physical Review Letters
卷	135
期	11
DOI	https://doi.org/10.1103/w9kp-f8xr
出版状态	已出版 - 12 9月 2025

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@article{41d366e02a57480db0bec8aada4d932a,

title = "Probing Gluon Fluctuations in Nuclei with the First Energy-Dependent Measurement of Incoherent (Formula presented) Photoproduction in Ultraperipheral PbPb Collisions",

abstract = "Incoherent (Formula presented) photoproduction in heavy ion ultraperipheral collisions (UPCs) provides a sensitive probe of localized, fluctuating gluonic structures within heavy nuclei. This Letter reports the first measurement of the photon-nucleon center-of-mass energy ((Formula presented)) dependence of this process in PbPb UPCs at a nucleon-nucleon center-of-mass energy of 5.02 TeV, using (Formula presented) of data recorded by the CMS experiment. The measurement covers a wide (Formula presented) range of (Formula presented), probing gluons carrying a fraction (Formula presented) of nucleon momentum down to an unexplored regime of (Formula presented). Compared to baseline predictions neglecting nuclear effects, the measured cross sections exhibit significantly greater suppression at lower (Formula presented). Additionally, the ratio of incoherent to coherent photoproduction is found to be constant across the probed (Formula presented) and (Formula presented) range, disfavoring the establishment of the black disk limit. This Letter provides critical insights into the (Formula presented)-dependent evolution of fluctuating gluonic structures within nuclei and calls for further advancements in theoretical models incorporating nuclear shadowing and gluon saturation.",

author = "\{CMS Collaboration\} and V. Chekhovsky and A. Hayrapetyan and V. Makarenko and A. Tumasyan and W. Adam and Andrejkovic, \{J. W.\} and L. Benato and T. Bergauer and S. Chatterjee and K. Damanakis and M. Dragicevic and Hussain, \{P. S.\} and M. Jeitler and N. Krammer and A. Li and D. Liko and I. Mikulec and J. Schieck and R. Sch{\"o}fbeck and D. Schwarz and M. Sonawane and W. Waltenberger and Wulz, \{C. E.\} and T. Janssen and H. Kwon and \{Van Laer\}, T. and \{Van Mechelen\}, P. and N. Breugelmans and J. D{\textquoteright}Hondt and S. Dansana and \{De Moor\}, A. and M. Delcourt and F. Heyen and Y. Hong and S. Lowette and I. Makarenko and D. M{\"u}ller and S. Tavernier and M. Tytgat and \{Van Onsem\}, \{G. P.\} and \{Van Putte\}, S. and D. Vannerom and B. Bilin and B. Clerbaux and Das, \{A. K.\} and \{De Bruyn\}, I. and \{De Lentdecker\}, G. and H. Evard and L. Favart and T. Cheng",

note = "Publisher Copyright: {\textcopyright} 2025 CERN, for the CMS Collaboration.",

year = "2025",

month = sep,

day = "12",

doi = "10.1103/w9kp-f8xr",

language = "英语",

volume = "135",

journal = "Physical Review Letters",

issn = "0031-9007",

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number = "11",

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TY - JOUR

T1 - Probing Gluon Fluctuations in Nuclei with the First Energy-Dependent Measurement of Incoherent (Formula presented) Photoproduction in Ultraperipheral PbPb Collisions

AU - CMS Collaboration

AU - Chekhovsky, V.

AU - Hayrapetyan, A.

AU - Makarenko, V.

AU - Tumasyan, A.

AU - Adam, W.

AU - Andrejkovic, J. W.

AU - Benato, L.

AU - Bergauer, T.

AU - Chatterjee, S.

AU - Damanakis, K.

AU - Dragicevic, M.

AU - Hussain, P. S.

AU - Jeitler, M.

AU - Krammer, N.

AU - Li, A.

AU - Liko, D.

AU - Mikulec, I.

AU - Schieck, J.

AU - Schöfbeck, R.

AU - Schwarz, D.

AU - Sonawane, M.

AU - Waltenberger, W.

AU - Wulz, C. E.

AU - Janssen, T.

AU - Kwon, H.

AU - Van Laer, T.

AU - Van Mechelen, P.

AU - Breugelmans, N.

AU - D’Hondt, J.

AU - Dansana, S.

AU - De Moor, A.

AU - Delcourt, M.

AU - Heyen, F.

AU - Hong, Y.

AU - Lowette, S.

AU - Makarenko, I.

AU - Müller, D.

AU - Tavernier, S.

AU - Tytgat, M.

AU - Van Onsem, G. P.

AU - Van Putte, S.

AU - Vannerom, D.

AU - Bilin, B.

AU - Clerbaux, B.

AU - Das, A. K.

AU - De Bruyn, I.

AU - De Lentdecker, G.

AU - Evard, H.

AU - Favart, L.

AU - Cheng, T.

PY - 2025/9/12

Y1 - 2025/9/12

N2 - Incoherent (Formula presented) photoproduction in heavy ion ultraperipheral collisions (UPCs) provides a sensitive probe of localized, fluctuating gluonic structures within heavy nuclei. This Letter reports the first measurement of the photon-nucleon center-of-mass energy ((Formula presented)) dependence of this process in PbPb UPCs at a nucleon-nucleon center-of-mass energy of 5.02 TeV, using (Formula presented) of data recorded by the CMS experiment. The measurement covers a wide (Formula presented) range of (Formula presented), probing gluons carrying a fraction (Formula presented) of nucleon momentum down to an unexplored regime of (Formula presented). Compared to baseline predictions neglecting nuclear effects, the measured cross sections exhibit significantly greater suppression at lower (Formula presented). Additionally, the ratio of incoherent to coherent photoproduction is found to be constant across the probed (Formula presented) and (Formula presented) range, disfavoring the establishment of the black disk limit. This Letter provides critical insights into the (Formula presented)-dependent evolution of fluctuating gluonic structures within nuclei and calls for further advancements in theoretical models incorporating nuclear shadowing and gluon saturation.

AB - Incoherent (Formula presented) photoproduction in heavy ion ultraperipheral collisions (UPCs) provides a sensitive probe of localized, fluctuating gluonic structures within heavy nuclei. This Letter reports the first measurement of the photon-nucleon center-of-mass energy ((Formula presented)) dependence of this process in PbPb UPCs at a nucleon-nucleon center-of-mass energy of 5.02 TeV, using (Formula presented) of data recorded by the CMS experiment. The measurement covers a wide (Formula presented) range of (Formula presented), probing gluons carrying a fraction (Formula presented) of nucleon momentum down to an unexplored regime of (Formula presented). Compared to baseline predictions neglecting nuclear effects, the measured cross sections exhibit significantly greater suppression at lower (Formula presented). Additionally, the ratio of incoherent to coherent photoproduction is found to be constant across the probed (Formula presented) and (Formula presented) range, disfavoring the establishment of the black disk limit. This Letter provides critical insights into the (Formula presented)-dependent evolution of fluctuating gluonic structures within nuclei and calls for further advancements in theoretical models incorporating nuclear shadowing and gluon saturation.

UR - https://www.scopus.com/pages/publications/105017417062

U2 - 10.1103/w9kp-f8xr

DO - 10.1103/w9kp-f8xr

M3 - 文章

C2 - 41004769

AN - SCOPUS:105017417062

SN - 0031-9007

VL - 135

JO - Physical Review Letters

JF - Physical Review Letters

IS - 11

M1 - 112301

ER -

Probing Gluon Fluctuations in Nuclei with the First Energy-Dependent Measurement of Incoherent (Formula presented) Photoproduction in Ultraperipheral PbPb Collisions

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