{'fraction_non_alphanumeric': 0.044854881266490766, 'fraction_numerical': 0.030343007915567283, 'mean_word_length': 4.838461538461538, '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}}
Measurement of the bb̄ Cross Section at HERA‐B

The bb production cross section has been measured in collisions of 920 GeV protons off a nuclei target using the HERA‐B detector. The identification of bb events was done via inclusive bottom quark decays into J/ψ by exploiting the longitudinal separation of the J/ψ → l+l− decay vertices from the primary proton nucleus interaction, where both the μ+μ− and the e+e− decay channels have been reconstructed. The first measurement, using data collected during a short period in 2000, yields a cross section in the combined analysis of σ(bb) = 32−12+14(stat)−7+6(sys) nb/nucleon. On the most recent data samples taken in 2002/03, a much more accurate measurement with the uncertainties reduced to 10% is expected.