Measurement of inclusive diffractive deep inelastic scattering using VFPS at H1

TL;DR

This paper discusses the performance and initial physics results of the VFPS detector at H1, measuring diffractive deep inelastic scattering and providing more precise insights into diffraction phenomena.

Contribution

It presents the first physics measurement using the VFPS, including acceptance, background estimation, and a preliminary cross section measurement that aligns with existing data and theoretical models.

Findings

VFPS acceptance and background estimation characterized

Preliminary cross section measurement agrees with previous results

Enhanced precision offers deeper understanding of diffraction

Abstract

Performances of the Very Forward Proton Spectrometer (VFPS) of the H1 detector at HERA using data collected during the 2006/2007 running period are discussed, including the description of acceptance, reconstruction of proton energy loss and estimation of the amount of the beam-gas background. The first physics result obtained with the VFPS detector - a preliminary measurement of the semi-inclusive reduced cross section is presented for the diffractive deep inelastic scattering process with the leading final state proton measured by the VFPS. Results of this measurement are found to be in agreement with other measurements by the H1 Collaboration and with a theoretical prediction based on a NLO DGLAP QCD fit. They provide a higher precision and therefore allow a deeper inside to the nature of diffraction.