Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A general method for determining the masses of semi-invisibly decaying
  particles at hadron colliders   We present a general solution to the long standing problem of determining the
masses of pair-produced, semi-invisibly decaying particles at hadron colliders.
We define two new transverse kinematic variables, $M_{CT_\perp}$ and
$M_{CT_\parallel}$, which are suitable one-dimensional projections of the
contransverse mass $M_{CT}$. We derive analytical formulas for the boundaries
of the kinematically allowed regions in the $(M_{CT_\perp},M_{CT_\parallel})$
and $(M_{CT_\perp},M_{CT})$ parameter planes, and introduce suitable variables
$D_{CT_\parallel}$ and $D_{CT}$ to measure the distance to those boundaries on
an event per event basis. We show that the masses can be reliably extracted
from the endpoint measurements of $M_{CT_\perp}^{max}$ and $D_{CT}^{min}$ (or
$D_{CT_\parallel}^{min}$). We illustrate our method with dilepton $t\bar{t}$
events at the LHC.

34
The categories of this paper are: chem-ph
4
The categories of this paper are: cond-mat
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
13
The categories of this paper are: quant-ph
7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
26
The categories of this paper are: bayes-an
15
The categories of this paper are: nucl-ex
6
The categories of this paper are: astro-ph
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc