Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Transformation properties of the transverse mass under transverse
  Lorentz boosts at hadron colliders   The transverse mass of semi-invisibly decaying particles, calculated from the
transverse momenta of their decay products, has been used in a broad range of
searches and measurements at hadron colliders, such as the LHC. This variable
is invariant by construction under Lorentz boosts purely in the longitudinal
(beam) direction, thereby minimising sensitivity to fluctuations in the
fractions of the proton momentum carried by the colliding partons. In this
paper we examine, by contrast, the properties of the transverse mass under
boosts with a component also in the transverse plane perpendicular to the beam
direction. We show that this variable is invariant under such boosts in cases
where the boost is purely transverse and (a) the momenta of the decay products
are confined to the transverse plane in the rest frame of the parent particle
and/or (b) the transverse momenta of the decay products are perpendicular to
the boost direction. We discuss the transformation properties of the transverse
mass in the case of combined transverse and longitudinal boosts and identify
the criteria under which the transverse mass in the laboratory frame can equal
the rest mass of the parent particle, irrespective of its value in the rest
frame of the parent.

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The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
7
The categories of this paper are: hep-th
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The categories of this paper are: hep-lat
25
The categories of this paper are: patt-sol
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The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
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The categories of this paper are: mtrl-th
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The categories of this paper are: supr-con
18
The categories of this paper are: econ
4
The categories of this paper are: cond-mat
3
The categories of this paper are: physics
13
The categories of this paper are: quant-ph