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19 lines
371 B
Python
19 lines
371 B
Python
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"""This module defines some observables on arrays of 4-pulses."""
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import numpy as np
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def p_t(p):
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"""Transverse impulse
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:param p: array of 4-impulses
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"""
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return np.linalg.norm(p[:,1:3], axis=1)
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def η(p):
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"""Pseudo rapidity.
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:param p: array of 4-impulses
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"""
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return np.arccosh(np.linalg.norm(p[:,1:], axis=1)/p_t(p))*np.sign(p[:, 3])
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