High statistics measurement of the underground muon pair separation at Gran Sasso

Details High statistics measurement of the underground muon pair separation at Gran Sasso High statistics measurement of the underground muon pair separation at Gran Sasso

1999-01-18

arxiv.org/abs/hep-ex/9901027v1

Phys.Rev.D60:032001,1999

Physics

High Energy Physics

High Energy Physics - Experiment

38 pages, Latex, 10 figures, Corrected typos

Scientific paper

10.1103/PhysRevD.60.032001

We present a measurement of the underground decoherence function using multi-muon events observed in the MACRO detector at Gran Sasso at an average depth of 3800 hg/cm**2. Muon pair separations up to 70 m have been measured, corresponding to parent mesons with P_t < 1-2GeV/c. The accuracy of the measurement is such that the possible contribution of rare processes, such as mu + N ----> mu + N + mu- + mu+, can be experimentally studied. The measured decoherence function is compared with the predictions of the hadronic interaction model of the HEMAS Monte Carlo code. Good agreement is obtained. We interpret this agreement to indicate that no anomalous P_t components in soft hadron-Nucleus and Nucleus-Nucleus collisions are required by the MACRO experimental data.

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