{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.156787.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/2811647"}},{"@id":"https://doi.org/10.1103/PhysRevD.111.012010","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"ALICE Collaboration"},"creator":{"@type":"Organization","name":"ALICE Collaboration"},"datePublished":"2025","description":"This paper reports the first measurement of the transverse momentum spectra of primary charged pions, kaons, (anti)protons, and unidentified particles as a function of the charged-particle flattenicity in pp collisions at $\\sqrt{s}=13~\\mathrm{TeV}$. Flattenicity is a novel event shape observable that is measured in the pseudorapidity intervals covered by the V0 detector, $2.8<\\eta<5.1$ and $-3.7<\\eta<-1.7$. According to QCD-inspired phenomenological models, it shows sensitivity to multiparton interactions and is less affected by biases due to local multiplicity fluctuations in the V0 acceptance than multiplicity. The analysis is performed in minimum-bias (MB) as well as in high-multiplicity events up to $p_{\\mathrm{T}}=20$ GeV/$c$. The event selection requires at least one charged particle produced in the pseudorapidity interval $|\\eta|<1$. The measured $p_{\\mathrm{T}}$ distributions, average $p_{\\mathrm{T}}$, kaon-to-pion and proton-to-pion particle ratios, presented in this paper, are compared to model calculations using \\py based on color strings and \\ep. The modification of the $p_{\\mathrm{T}}$-spectral shapes in low-flattenicity events that have large event activity with respect to those measured in MB events develops a pronounced peak at intermediate $p_{\\mathrm{T}}$ ($2<p_{\\mathrm{T}}<8$ GeV/$c$), and approach to the vicinity of unity at higher $p_{\\mathrm{T}}$. Results are qualitatively described by PYTHIA and qualitatively different with respect to the analyses as a function of multiplicity.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.156787.v1/t1","@type":"Dataset","description":"Transverse momentum spectrum of $\\pi^{+} + \\pi^{-}$ measured at midrapidity ($|y|<0.5$) in INEL>0 pp collisions at $\\sqrt{s}$ = 13 TeV...","name":"Table 1"},{"@id":"https://doi.org/10.17182/hepdata.156787.v1/t2","@type":"Dataset","description":"Transverse momentum spectrum of $K^{+} + K^{-}$ measured at midrapidity ($|y|<0.5$) in INEL>0 pp collisions at $\\sqrt{s}$ = 13 TeV...","name":"Table 2"},{"@id":"https://doi.org/10.17182/hepdata.156787.v1/t3","@type":"Dataset","description":"Transverse momentum spectrum of $p + \\overline{p}$ measured at midrapidity ($|y|<0.5$) in INEL>0 pp collisions at $\\sqrt{s}$ = 13 TeV...","name":"Table 3"},{"@id":"https://doi.org/10.17182/hepdata.156787.v1/t4","@type":"Dataset","description":"Transverse momentum spectrum 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measured at midrapidity ($|y|<0.5$) in INEL>0 pp collisions at $\\sqrt{s}$ = 13 TeV for...","name":"Table 8"},{"@id":"https://doi.org/10.17182/hepdata.156787.v1/t9","@type":"Dataset","description":"The $p_{\\rm T}$-differential $(K^{+} + K^{-})/(\\pi^{+}+\\pi^{-})$ particle ratio for two extremes of flattenicity event classes measured in multiplicity-integrated events in...","name":"Table 9"},{"@id":"https://doi.org/10.17182/hepdata.156787.v1/t10","@type":"Dataset","description":"The $p_{\\rm T}$-differential $(p + \\overline{p})$/($\\pi^{+}+\\pi^{-}$) particle ratio for two extremes of flattenicity event classes measured in multiplicity-integrated events in...","name":"Table 10"},{"@id":"https://doi.org/10.17182/hepdata.156787.v1/t11","@type":"Dataset","description":"The $p_{\\rm T}$-differential $(K^{+} + K^{-})/(\\pi^{+}+\\pi^{-})$ particle ratio for two extremes of flattenicity event classes measured in the 0-1% V0M...","name":"Table 11"},{"@id":"https://doi.org/10.17182/hepdata.156787.v1/t12","@type":"Dataset","description":"The $p_{\\rm T}$-differential $(p + \\overline{p})$/($\\pi^{+}+\\pi^{-}$) particle ratio for two extremes of flattenicity event classes measured in the 0-1% V0M...","name":"Table 12"},{"@id":"https://doi.org/10.17182/hepdata.156787.v1/t13","@type":"Dataset","description":"Transverse momentum-integrated $(K^{+} + K^{-})/(\\pi^{+}+\\pi^{-})$ particle ratio as a function of the average charged-particle density calculated for different flattenicity event...","name":"Table 13"},{"@id":"https://doi.org/10.17182/hepdata.156787.v1/t14","@type":"Dataset","description":"Transverse momentum-integrated $(p + \\overline{p})$/($\\pi^{+}+\\pi^{-}$) particle ratio as a function of the average charged-particle density calculated for different flattenicity event...","name":"Table 14"},{"@id":"https://doi.org/10.17182/hepdata.156787.v1/t15","@type":"Dataset","description":"Average transverse momentum of 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flattenicity in pp collisions at $\\sqrt{s}$ = 13 TeV","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/ins2811647?version=1","version":1}