Sneutrino identification in dilepton events at the LHC

A. A. Pankov; A. V. Tsytrinov; N. Paver; P. Osland

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Sneutrino identification in dilepton events at the LHC

P. Osland, A. A. Pankov, N. Paver, A. V. Tsytrinov

High Energy Physics - Phenomenology · Submitted 8 Aug 2010

abstract compiled · 2026-09-23 · no language-model review

The authors' main claim We find that although the measured event rate permits solving the above problem partially, the center-edge asymmetry, on the contrary allows to differentiate the various spins entirely with a minimal number of events around 200.

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What the abstract itself states, as probabilities: claims first 0.05 · states limitation 0.57 · human participants 0.01 · controlled comparison 0.25 · randomized assignment 0.01 · states quantitative result 0.97 · compares with prior results 0.34 · mentions code or data availability 0.02.

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arXiv listing abstract v2. Results and the main claim are underlined; show every role.

Heavy neutral resonances appearing in the clean Drell-Yan channel may be the first new physics to be observed at the proton-proton CERN LHC. If a new resonance is discovered at the LHC as a (narrow) peak in the dilepton invariant mass distribution, the characterization of its spin and couplings will proceed via the measurement of production rates and angular distributions of the decay products. We discuss the discrimination of a spin-0 resonance (sneutrino) predicted by supersymmetric theories with R-parity breaking against the spin-1 of Z^\prime bosons and the Randall-Sundrum graviton resonance (spin-2) with the same mass and producing the same number of events under the observed peak. To assess the region of sneutrino parameters (couplings and masses) where the spin determination can be performed to a given confidence level, we focus on the event rate and the angular distributions of the Drell-Yan leptons, in particular using the center-edge asymmetry, A_{\rm CE}. We find that although the measured event rate permits solving the above problem partially, the center-edge asymmetry, on the contrary allows to differentiate the various spins entirely with a minimal number of events around 200.

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#	sentence	role	the authors' own work	states the main conclusion	strength
s0	Heavy neutral resonances appearing in the clean Drell-Yan channel may be the first new physics to be observed at the proton-proton CERN LHC.	background 1.00	0.06	0.02	hedged possibility 1.00
s1	If a new resonance is discovered at the LHC as a (narrow) peak in the dilepton invariant mass distribution, the characterization of its spin and couplings will proceed via the measurement of production rates and angular distributions of the decay products.	background 0.98	0.06	0.03	asserted 0.78
s2	We discuss the discrimination of a spin-0 resonance (sneutrino) predicted by supersymmetric theories with R-parity breaking against the spin-1 of Z^\prime bosons and the Randall-Sundrum graviton resonance (spin-2) with the same mass and producing the same number of events under the observed peak.	contribution 0.96	0.51	0.05	asserted 0.88
s3	To assess the region of sneutrino parameters (couplings and masses) where the spin determination can be performed to a given confidence level, we focus on the event rate and the angular distributions of the Drell-Yan leptons, in particular using the center-edge asymmetry, A_{\rm CE}.	method 0.95	0.74	0.06	asserted 0.83
s4	We find that although the measured event rate permits solving the above problem partially, the center-edge asymmetry, on the contrary allows to differentiate the various spins entirely with a minimal number of events around 200.	result 1.00	0.95	0.90	asserted 1.00

What kind of paper the classifier reports this is: method or tool 0.34 · evidence from simulation or computation 0.84.

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The paper

Original abstract

Heavy neutral resonances appearing in the clean Drell-Yan channel may be the first new physics to be observed at the proton-proton CERN LHC. If a new resonance is discovered at the LHC as a (narrow) peak in the dilepton invariant mass distribution, the characterization of its spin and couplings will proceed via the measurement of production rates and angular distributions of the decay products. We discuss the discrimination of a spin-0 resonance (sneutrino) predicted by supersymmetric theories with R-parity breaking against the spin-1 of Z^\prime bosons and the Randall-Sundrum graviton resonance (spin-2) with the same mass and producing the same number of events under the observed peak. To assess the region of sneutrino parameters (couplings and masses) where the spin determination can be performed to a given confidence level, we focus on the event rate and the angular distributions of the Drell-Yan leptons, in particular using the center-edge asymmetry, A_{\rm CE}. We find that although the measured event rate permits solving the above problem partially, the center-edge asymmetry, on the contrary allows to differentiate the various spins entirely with a minimal number of events around 200.

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4 arXiv papers cite this in 9 sentences

Each citing sentence is taken from the citing paper's LaTeX source and typed by Pith's classifier. A label appears at probability 0.8 or more (0.95 for support), a contest at 0.7 or more; the quoted words are the citing authors'. How each label was checked · JSON

Papers citing it · 6 sentences without a confident label

Uses its method or tool 1 paper

This difficulty may be avoided by using as the basic observable for the angular analysis the $z$-evenly integrated center-edge angular asymmetry, defined as [ref] :

Spin identification of heavy nonstandard bosons in dilepton and diphoton events at the LHC · Cross sections and center-edge asymmetry · 0.92

Compares with it 1 paper

We also compare the capability of the ILC to distinguish effects of $s$-channel sneutrino exchange in the lepton pair production process from other NP interactions with the corresponding potential of the Drell-Yan process ($l=e,μ$) [ref] [equation] at the LHC.

Sneutrino Identification in Lepton Pair Production at ILC with Polarized Beams · Introduction · 0.89

Cites it as background 1 paper

(For instances, see Refs. [ref] ).

Minimal gauge origin of baryon triality and flavorful signatures at the LHC · Flavor-sensitive implications for the LHC · 0.98

What it cites · 31 sentences without a confident label

Uses the method or tool of 2 papers

To perform the angular analysis we use the evenly integrated angular center-edge asymmetry, defined as [ref] : [equation] Here, $0<z^*<z_cut$ is a priori free, and defines the separation between the “center” and the “edge” angular regions.

Spin and model identification of Z' bosons at the LHC · Center-edge asymmetry for spin identification · 0.99
To perform the angular analysis we use the evenly integrated angular center-edge asymmetry, defined as [ref] : [equation] Here, $0<z^*<z_cut$ is a priori free, and defines the separation between the “center” and the “edge” angular regions.

Discriminating graviton exchange effects from other new physics scenarios in e^+e^- collisions · Center-edge asymmetry for spin identification · 0.99

Uses data or values from 3 papers

Recent experimental limits (95% CL) from the Fermilab Tevatron ($e^+e^-$ channel) range from $M_G>600$ GeV for $c≅0.01$ up to $M_G>1.05$ TeV for $c≅0.1$ [ref] .

Search for Randall-Sundrum gravitons in the dielectron and diphoton final states with 5.4 fb-1 of data from ppbar collisions at sqrt(s)=1.96 TeV · Graviton excitation from small warped extra dimensions · 0.97
Current experimental lower limits on $M_Z^'$, from the Tevatron collider [ref] , are model dependent and range from 878 GeV for $Z^'_ψ$ to 1.03 TeV for $Z^'_SSM$ (95% CL).

A search for high-mass resonances decaying to dimuons at CDF · Extra neutral gauge bosons · 1.00
Again, a $K$-factor value of 1.30 will be assumed for all $Z^'$ models [ref] .

Z-prime Gauge Bosons at the Tevatron · Extra neutral gauge bosons · 0.96

Cites as background 11 papers

The simplest version of RS models [ref] , that addresses the so-called gauge hierarchy problem $M_Pl≫M_EW$, consists of one warped extra spatial dimension and two three-dimensional branes at a compactification distance $R_c$, such that the ordinary SM fields are localized on one brane and gravity originates from the other one and can propagate in the full 5-dimensional space.

A Large Mass Hierarchy from a Small Extra Dimension · Graviton excitation from small warped extra dimensions · 1.00
The default assumption would be a spin-1 $Z^'$, for which many models have been proposed [ref] , whereas the more exotic options would be the Randall-Sundrum (RS) spin-2 graviton excitation [ref] or a spin-0 scalar.

The Phenomenology of Extra Neutral Gauge Bosons · Introduction · 1.00
However, since such baryon and lepton-number violating processes can in principle be avoided (or suppressed) also by some other additional symmetries, SUSY models where $R$-parity violation can to some extent occur are viable and the corresponding phenomenological scenarios have gained considerable interest, see, for example, Refs. [ref] .

A reappraisal of spontaneous R-parity violation · Introduction · 0.87

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