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Adersberger, M.; Bender, M.; Biebel, O.; Bock, C.; Bogavac, D.; Duckeck, G.; Flierl, B. M.; Hartmann, N. M.; Heinrich, J. J.; Hertenberger, R.; Hönig, F.; Legger, F.; Lorenz, J.; Lösel, P. J.; Maier, T.; Mann, A.; Mehlhase, S.; Mitrevski, J.; Müller, R. S. P.; Schachtner, B. M.; Rauscher, F.; Schaile, D.; Unverdorben, C.; Valderanis, C.; Wagner-Kuhr, J.; Walker, R. (2017): Study of ordered hadron chains with the ATLAS detector. In: Physical Review D, Vol. 96, Nr. 9, 92008
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Abstract

The analysis of the momentum difference between charged hadrons in high-energy proton-proton collisions is performed in order to study coherent particle production. The observed correlation pattern agrees with a model of a helical QCD string fragmenting into a chain of ground-state hadrons. A threshold momentum difference in the production of adjacent pairs of charged hadrons is observed, in agreement with model predictions. The presence of low-mass hadron chains also explains the emergence of charge-combination-dependent two-particle correlations commonly attributed to Bose-Einstein interference. The data sample consists of 190 mu b(-1) of minimum-bias events collected with proton-proton collisions at a center-of-mass energy root s = 7 TeV in the early low-luminosity data taking with the ATLAS detector at the LHC.