Transverse observables and mass determination at hadron colliders

Gripaios, Ben

doi:10.1088/1126-6708/2008/02/053

Cited by 96 publications

(119 citation statements)

References 8 publications

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“…Taking the CP conjugate of the preceding 6 Of course, in general, one can find the expressions for both the balanced and the unbalanced solutions in the case of on-shell intermediate particles [4]. 7 A similar kink also appears for the case of one visible particle in each decay chain if the total transverse momentum of the two mother particles is non-zero, for example, in the presence of initial/final state radiation (see [5]), but (as mentioned earlier) we neglect this possibility for simplicity. statement, we see that a heavier Z 3 -charged particle with the other type of charge, namely q = 2, is allowed to decay into two φ 0 's or singleφ 0 .…”

Section: T 2 For Z Modelsmentioning

confidence: 96%

“…Reconstructing the decay chains leading to such events will enable us to determine the masses of the DM and the mother particles; it is advantageous to do this in a model-independent manner. A tremendous amount of effort has been put-in into such a research program, especially at the CERN Large Hadron Collider (LHC), see, for example [2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22]. …”

Section: Introductionmentioning

confidence: 99%

“…Since we can only measure the total missing transverse momentum in the event which is shared between invisible particles from two mothers, we must use measurements from both sides. An option is to use "M T 2 "-type observables/variables [2,3,4,5,6,7,8,9,10,11,12,13,14,15,16] Another case where one of the analyses of reference [36] (based on single mother decay) might not work is when the visible/SM particles in the decay chains with one and two DM (of course for Z 3 model) are not identical (even if they are more than one). Thus, one does not obtain a double edge for the case of intermediate particles in the decay chains being off-shell.…”

Section: Introductionmentioning

confidence: 99%

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UsingMT2to distinguish dark matter stabilization symmetries

et al. 2011

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We examine the potential of using colliders to distinguish models with parity (Z 2 ) stabilized dark matter (DM) from models in which the DM is stabilized by other symmetries, taking the latter to be a Z 3 symmetry for illustration. The key observation is that a heavier mother particle charged under a Z 3 stabilization symmetry can decay into one or two DM particles along with Standard Model (SM) particles. This can be contrasted with the decay of a mother particle charged under a parity symmetry; typically, only one DM particle appears in the decay chain. The arXiv:1003.0899 studied the distributions of visible invariant mass from the decay of a single such mother particle in order to highlight the resulting distinctive signatures of Z 3 symmetry versus parity symmetry stabilized dark matter candidates. We now describe a complementary study which focuses on decay chains of the two mother particles which are necessarily present in these events.We also include in our analyss the missing energy/momentum in the event. For the Z 3 symmetry stabilized mothers, the resulting inclusive final state can have two, three or four DM particles. In contrast, models with Z 2 symmetry can have only two. We show that the shapes and edges of the distribution of M T 2 -type variables, along with ratio of the visible momentum/energy on the two sides of the event, are powerful in distinguishing these different scenarios. Finally we conclude by outlining future work which focus on reducing combinatoric ambiguities from reconstructing multi-jet events. Increasing the reconstruction efficiency can allow better reconstruction of events with two or three dark matter candidates in the final state.

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Section: T 2 For Z Modelsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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UsingMT2to distinguish dark matter stabilization symmetries

et al. 2011

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“…Recently, several methods have been proposed to measure the mass of new physics particles directly [18,19,20,21,22,23,24]. A detailed discussion of these methods is beyond the scope of this review.…”

Section: Rate and Mass Measurementmentioning

confidence: 99%

A Review of Spin Determination at the LHC

Wang

Yavin

2008

Int. J. Mod. Phys. A

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Spin measurements are crucial in distinguishing major scenarios of TeV scale new physics once it is discovered at the LHC. We give a brief survey of methods of measuring the spin of new physics particles at the LHC. We focus on the case in which a long lived massive neutral particle is produced at the end of every cascade decay and escape detection. This is the case for Rparity preserving supersymmetry, Little Higgs models with T-parity, extra-dimensional models with KK-parity, and a large class of similar models and scenarios. After briefly commenting on measuring spin by combining mass and rate information, we concentrate on direct measurement by observing angular correlations among decay products of the new physics particles. We survey a wide range of possible channels, discuss the construction of possible correlation variables, and outline experimental challenges. We also briefly survey the Monte-Carlo tools which are useful in studying such correlations.

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“…However, its use is often computationally prohibitive, especially when dealing with complicated final states and/or large reducible backgrounds. Many of the approaches described above have been extended in various ways, e.g., the M T 2 kink method allows the measurement of the mass of the lightest NPP [75][76][77][78][79][80][81][82], and useful 3 + 1-dimensional analogues of the "transverse" invariant mass variables have been suggested [83][84][85][86][87][88][89][90][91][92].…”

Section: Introductionmentioning

confidence: 99%

Identifying phase-space boundaries with Voronoi tessellations

et al. 2016

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Determining the masses of new physics particles appearing in decay chains is an important and longstanding problem in high energy phenomenology. Recently it has been shown that these mass measurements can be improved by utilizing the boundary of the allowed region in the fully differentiable phase space in its full dimensionality. Here we show that the practical challenge of identifying this boundary can be solved using techniques based on the geometric properties of the cells resulting from Voronoi tessellations of the relevant data. The robust detection of such phase-space boundaries in the data could also be used to corroborate a new physics discovery based on a cut-and-count analysis.

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Transverse observables and mass determination at hadron colliders

Cited by 96 publications

References 8 publications

UsingMT2to distinguish dark matter stabilization symmetries

UsingMT2to distinguish dark matter stabilization symmetries

A Review of Spin Determination at the LHC

Identifying phase-space boundaries with Voronoi tessellations

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