Title Measurement of the diffractive longitudinal structure function $F_{L}^{D}$ at HERA Measurement of the diffractive longitudinal structure function $F_{L}^{D}$ at HERA Author Aaron, F.D. de Wolf, E.A. Janssen, X. Van Mechelen, P. et al. Faculty/Department Faculty of Sciences. Physics Publication type article Publication 2011 Berlin , 2011 Subject Physics Source (journal) European physical journal : C : particles and fields. - Berlin Volume/pages 71(2011) :12 , p. 1836,1-1836,21 ISSN 1434-6044 ISI 000298347800024 Carrier E-only publicatie Target language English (eng) Full text (Publishers DOI) Affiliation University of Antwerp Abstract First measurements are presented of the diffractive cross section σ ep→eXY at centre-of-mass energies s of 225 and 252GeV, together with a precise new measurement at s of 319GeV , using data taken with the H1 detector in the years 2006 and 2007. Together with previous H1 data at s of 301GeV , the measurements are used to extract the diffractive longitudinal structure function FLD in the range of photon virtualities 40Q2440GeV2 and fractional proton longitudinal momentum loss 5×10−4≤x ℙ≤3×10−3. The measured FLD is compared with leading twist predictions based on diffractive parton densities extracted in NLO QCD fits to previous measurements of diffractive Deep-Inelastic Scattering and with a model which additionally includes a higher twist contribution derived from a colour dipole approach. The ratio of the diffractive cross section induced by longitudinally polarised photons to that for transversely polarised photons is extracted and compared with the analogous quantity for inclusive Deep-Inelastic Scattering. E-info https://repository.uantwerpen.be/docman/iruaauth/aa469f/64884014c6b.pdf http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000298347800024&DestLinkType=RelatedRecords&DestApp=ALL_WOS&UsrCustomerID=ef845e08c439e550330acc77c7d2d848 http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000298347800024&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=ef845e08c439e550330acc77c7d2d848 http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000298347800024&DestLinkType=CitingArticles&DestApp=ALL_WOS&UsrCustomerID=ef845e08c439e550330acc77c7d2d848 Handle