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Title

Measurement of differential cross sections for single diffractive dissociation in √s = 8 TeV pp collisions using the ATLAS ALFA spectrometer

AuthorsATLAS Collaboration; Álvarez Piqueras, D. ; Aparisi, Pozo, J.A.; Bailey, A.J.; Cabrera, Susana ; Castillo, F.L.; Castillo Mª Victoria; Cerda Alberich, L.; Costa, María José ; Escobar, Carlos ; Estrada, Oscar; Ferrer, Antonio ; Fiorini, L. ; Fullana, Esteban ; Fuster, Juan ; García García, Carmen ; García Navarro, José Enrique ; González de la Hoz, Santiago ; Gonzalvo Rodríguez, Galo Rafael; Guerrero Rojas, J.G.R.; Higón, Emilio ; Lacasta Llácer, Carlos ; Lozano Bahilo, José J.; Madaffari, Daniele; Mamuzic, Judita; Martí García, Salvador ; Melini, Davide; Miñano Moya, M.; Mitsou, Vasiliki A. ; Rodriguez Bosca, S.; Rodriguez Rodriguez, D.; Ruiz Martínez, Arantxa ; Salt, José ; Santra, A.; Soldevila, Urmila ; Sánchez Martínez, Javier ; Valero, Alberto ; Valls Ferrer, Juan Antonio ; Vos, Marcel
Issue DateFeb-2020
PublisherInstitute of Physics Publishing
CitationJournal of High Energy Physics 2020: 42 (2020)
AbstractA dedicated sample of Large Hadron Collider proton-proton collision data at centre-of-mass energy s = 8 TeV is used to study inclusive single diffractive dissociation, pp → X p. The intact final-state proton is reconstructed in the ATLAS ALFA forward spectrometer, while charged particles from the dissociated system X are measured in the central detector components. The fiducial range of the measurement is −4.0 < logξ < −1.6 and 0.016 < |t| < 0.43 GeV, where ξ is the proton fractional energy loss and t is the squared four-momentum transfer. The total cross section integrated across the fiducial range is 1.59 ± 0.13 mb. Cross sections are also measured differentially as functions of ξ, t, and ∆η, a variable that characterises the rapidity gap separating the proton and the system X. The data are consistent with an exponential t dependence, dσ/dt ∝ e with slope parameter B = 7.65 ± 0.34 GeV. Interpreted in the framework of triple Regge phenomenology, the ξ dependence leads to a pomeron intercept of α(0) = 1.07 ± 0.09. [Figure not available: see fulltext.]
Publisher version (URL)http://dx.doi.org/10.1007/JHEP02(2020)042
URIhttp://hdl.handle.net/10261/232860
Identifiersdoi: 10.1007/JHEP02(2020)042
issn: 1029-8479
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