A pretty straightforward question because right now I can't think how it works:(adsbygoogle = window.adsbygoogle || []).push({});

The missing transverse momentum azimuthial angle (φ) is calculated by measuring the x- and y- components of the missing transverse momentum [itex]E_x,E_y[/itex] and taking:

[itex]\phi^{miss} = arctan(E_y/E_x)[/itex]

https://cds.cern.ch/record/2037904/files/ATL-PHYS-PUB-2015-027.pdf (equation 3)

So if that's the final formula, then the [itex]\phi^{miss} \in [- \pi/2, \pi/2][/itex]...

how is it possible to span the whole range, [itex]\phi^{miss} \in [-\pi, \pi] [/itex] ?

wouldn't there have to be a case when [itex]E_x<0[/itex] to take an alternative formula?

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# A Missing transverse momentum azimuthial angle

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