{'fraction_non_alphanumeric': 0.02626521460602178, 'fraction_numerical': 0.011531069827033953, 'mean_word_length': 4.850187265917603, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Hermes Semi-inclusive Results I Introduction

From the rst year of HERMES data taking with a polarized 3 He gas target, we have obtained spin asymmetries for semi-inclusive charged hadron electroproduction. Also shown are angular distributions for diiractive 0 production. The measurement of the spin-dependent structure functions and the evaluation of associated sum rules has been our principle source of information on the composition of the spin of the nucleon at the partonic level. The success of this approach has been impressive. Nevertheless, it is somewhat limited. In order to disentangle the diierent partonic distribution functions, it is desirable to tag the avor of the struck quark. This is the principle motivation for semi-inclusive measurements. The Hermes experiment has already been introduced by the previous speaker 1]. In addition to its ability to detect the scattered lepton, it is well suited to record charged and neutral nal states over a wide kinematic range in the forward (struck quark) fragmentation region. The experiment was commissioned in 1995 and recorded 2.7 million DIS events (after data quality and standard kinematic cuts) on the polarized 3 He gas target. An additional 1 million DIS events were taken with unpolarized hydrogen and deuterium gas targets. The analysis of the 1995 running period is relatively advanced and well understood. For example, excellent agreement with world data is obtained for the neutron/proton cross section ratios F n 2 (x)=F p 2 (x), and for the valence quark ratios d v (x)=u v (x) 2].