mt2 0.2.0

Stransverse mass computation as a numpy ufunc.

mt2

MT2, Asymmetric MT2, and the Stransverse Mass

This package may be used to evaluate MT2 in all its variants.

Specifically, it provides a numpy ufunc interface to the bisection algorithm and C++ implementation of http://arxiv.org/abs/1411.4312. The variable MT2 itself is described here. Related information may be found in papers relating to MT2 linked from here.

Example Usage

Single calculation of MT2:

from mt2 import mt2

# The units of all quantities are the same, e.g. GeV
val = mt2(
    100, 410, 20,  # Visible 1: mass, px, py
    150, -210, -300,  # Visible 2: mass, px, py
    -200, 280,  # Missing transverse momentum: x, y
    100, 100)  # Invisible 1 mass, invisible 2 mass
print("Expected mT2 = 412.628.  Computed mT2 = ", val)

An example using broadcasting:

# to appear soon ....

License

Please cite:

• http://arxiv.org/abs/hep-ph/9906349, if you use MT2 in an academic paper, and

• http://arxiv.org/abs/1411.4312 if you use this particular calculator.

All files other than src/lester_mt2_bisect_v7.h are released under the MIT license.

History

0.2.0 (2021-02-13)

• Fix numpy build dependencies to use oldest possible version, so that wheels are maximally compatible.

• Don’t support Python 3.5

0.1.6 (2021-02-11)

• Fix build for numpy versions prior to 1.19

0.1.5 (2021-02-10)

• Migrate to preliminary v7 of C file

• Disable copyright message printing on run

• Move away from pybind11 in favour of raw numpy C API

0.1.4 (2021-02-09)

• Actually fix the build, maybe

0.1.3 (2021-02-09)

• Fix the build

0.1.2 (2021-02-09)

• Attempt C++ build

0.1.1 (2021-02-09)

• Trivial change to test updating package on PyPI.

0.1.0 (2021-02-09)

• First release on PyPI.