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S. Kullback and R. A. Leibler, On information and sufficiency
1951
Earlier work this paper cites.
C. Lester and D. Summers, Measuring masses of semiinvisibly decaying particles pair produced at hadron colliders
1999
Earlier work this paper cites.
J. Pumplin et. al
2002
Earlier work this paper cites.
A. Barr, C. Lester, and P. Stephens, m(T2): The Truth behind the glamour
2003
Earlier work this paper cites.
M. Battaglia, A. Datta, A. De Roeck, K. Kong, and K. T. Matchev, Contrasting supersymmetry and universal extra dimensions at the clic multi-TeV e+ e- collider
2005
Earlier work this paper cites.
A. J. Barr, Measuring slepton spin at the LHC
2006
Earlier work this paper cites.

Similar

C. G. Lester, M. A. Parker, and . White, Martin J., Determining SUSY model parameters and masses at the LHC using cross-sections, kinematic edges and other observables
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Then

A. J. Barr and C. G. Lester, A Review of the Mass Measurement Techniques proposed for the Large Hadron Collider
Original
2010
Later among the works it cites.
P. Konar, K. Kong, K. T. Matchev, and M. Park, Superpartner Mass Measurement Technique using 1D Orthogonal Decompositions of the Cambridge Transverse Mass Variable M T 2 M_{T2}
Original
2010
Later among the works it cites.
H.-C. Cheng, Z. Han, I.-W. Kim, and L.-T. Wang, Missing Momentum Reconstruction and Spin Measurements at Hadron Colliders
Original
2010
Later among the works it cites.
C.-Y. Chen and A. Freitas, General analysis of signals with two leptons and missing energy at the Large Hadron Collider
Original
2011
Closest in time.
G. Moortgat-Pick, K. Rolbiecki, and J. Tattersall, Early spin determination at the LHC?

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2011

Spin before mass at the LHC

Melia, Tom

Understand

What can be said about the spin of new particles without knowing their mass during an initial discovery phase at CERN? We consider this question in a topology where mass measurement is particularly difficult, $pp\to Y\bar{Y}\to lX\bar{l}\,\bar{X}$, and introduce two new variables $\ctv$ and $\Av$ which we prove are both independent of the mass of $X$.

The variable $\ctv$ approximates the polar production angle of $Y$, and we find that it possesses greater statistical power in determining the spin of this particle than a previous, related variable, $\ctll$ \cite{Barr:2005dz}.
$\Av$ is an asymmetry which can provide information about the couplings of a spin half $Y$.
Because these variables can be used from the outset, without any knowledge of the masses of the new particles, we find here that it is possible to reverse the usual `mass before spin' determination timeline.

Built on

S. Kullback and R. A. Leibler, On information and sufficiency
1951
Earlier work this paper cites.
C. Lester and D. Summers, Measuring masses of semiinvisibly decaying particles pair produced at hadron colliders
1999
Earlier work this paper cites.
J. Pumplin et. al
2002
Earlier work this paper cites.
A. Barr, C. Lester, and P. Stephens, m(T2): The Truth behind the glamour
2003
Earlier work this paper cites.
M. Battaglia, A. Datta, A. De Roeck, K. Kong, and K. T. Matchev, Contrasting supersymmetry and universal extra dimensions at the clic multi-TeV e+ e- collider
2005
Earlier work this paper cites.
A. J. Barr, Measuring slepton spin at the LHC
2006
Earlier work this paper cites.