Measuring slepton masses and mixings at the LHC

Feng, Jonathan L.; French, S. T.; Galon, Iftah; Lester, C. G.; Nir, Yosef; Shadmi, Yael; Sanford, David; Yu, Felix

doi:10.1007/jhep01(2010)047

Cited by 27 publications

(28 citation statements)

References 38 publications

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“…If these particles are light, they must be very weakly interacting (or more precisely, the flavor-violating part of the interaction must be very small) in order to remain consistent with null results for experimental searches for LFV. This is typically the case considered when flavor violation is included in the minimal supersymmetric standard model via a mismatch between the mass bases of the charged leptons and their superpartners [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. In such a situation, the most promising probes of LFV are typically through a combination of low energy searches for rare processes and collider searches aimed at directly observing the particles mediating the interaction themselves.…”

Section: Introductionmentioning

confidence: 99%

Searching for lepton flavor violation at a future high energye+e−collider

Murakami

Tait

2015

Phys. Rev. D

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We consider theories where lepton flavor is violated, in particular concentrating on the four fermion operator consisting of three electrons and a tau. Strong constraints are available from existing searches for τ → eee, requiring the scale of the contact interaction to be < ∼ 1/(9 TeV) 2 . We reexamine this type of physics, assuming that the particles responsible are heavy (with masses > ∼ TeV) such that a contact interaction description continues to be applicable at the energies for a future e + e − collider. We find that the process e + e − → eτ can be a very sensitive probe of this kind of physics (even for very conservative assumptions about the detector performance), already improving upon the tau decay bounds to < ∼ 1/(11 TeV) 2 at collider energy √ s = 500 GeV, or reaching < ∼ 1/(35 TeV) 2 for √ s = 3 TeV. Even stronger bounds are possible at e − e − colliders in the same energy range.

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Section: Introductionmentioning

confidence: 99%

Searching for lepton flavor violation at a future high energye+e−collider

Murakami

Tait

2015

Phys. Rev. D

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“…The phenomenology and implication of sizable flavor mixing in the slepton sector can be found in refs. [30][31][32]. For the third generation charged leptons (staus), leftright mixing may be sizable, especially if tan β is large.…”

Section: Slepton Spectrummentioning

confidence: 99%

Impact of LSP character on Slepton reach at the LHC

Eckel

Ramsey-Musolf

Shepherd

et al. 2014

J. High Energ. Phys.

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Searches for supersymmetry at the Large Hadron Collider (LHC) have significantly constrained the parameter space associated with colored superpartners, whereas the constraints on color-singlet superpartners are considerably less severe. In this study, we investigate the dependence of slepton decay branching fractions on the nature of the lightest supersymmetric particle (LSP). In particular, in the Higgsino-like LSP scenarios, both decay branching fractions of˜ L andν depend strongly on the sign and value of M 1 /M 2 , which has strong implications for the reach of dilepton plus / E T searches for slepton pair production. We extend the experimental results for same flavor, opposite sign dilepton plus / E T searches at the 8 TeV LHC to various LSP scenarios. We find that the LHC bounds on sleptons are strongly enhanced for a non-Bino-like LSP: the 95% C.L. limit for m˜ L extends from 300 GeV for a Bino-like LSP to about 370 GeV for a Wino-like LSP. The bound for˜ L with a Higgsino-like LSP is the strongest (∼ 490 GeV) for M 1 /M 2 ∼ − tan 2 θ W and is the weakest (∼ 220 GeV) for M 1 /M 2 ∼ tan 2 θ W . We also calculate prospective slepton search reaches at the 14 TeV LHC. With 100 fb −1 integrated luminosity, the projected 95% C.L. mass reach for the left-handed slepton varies from 550 (670) GeV for a Bino-like (Winolike) LSP to 900 (390) GeV for a Higgsino-like LSP under the most optimistic (pessimistic) scenario. The reach for the right-handed slepton is about 440 GeV. The corresponding 5σ discovery sensitivity is about 100 GeV smaller. For 300 fb −1 integrated luminosity, the reach is about 50 − 100 GeV higher.

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“…The phenomenology and implication of sizable flavor mixing in the slepton sector can be found in Ref. [19,20]. Furthermore, the leftright mixing in the slepton sector is typically proportional to the lepton Yukawa, which is small for the first two generations.…”

Section: Mssm With Light Gauginos and Sleptonsmentioning

confidence: 99%

Slepton discovery in electroweak cascade decay

Eckel

Shepherd

2012

J. High Energ. Phys.

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The LHC studies on the MSSM slepton sector have mostly been focused on direct slepton Drell-Yan pair production. In this paper, we analyze the case when the sleptons are lighter than heavy neutralinos and can appear in the on-shell decay of neutralino states. In particular, we have studied the χ ± 1 χ 0 2 associated production, with the consequent decays of χ ± 1 → ν ℓ ℓχ 0 1 and χ 0 2 → ℓℓχ 0 1 via on-shell sleptons. The invariant mass of the lepton pairs, m ℓℓ , from the neutralino decay has a distinctive triangle shape with a sharp kinematic cutoff. We discuss the utilization of this triangle shape in m ℓℓ distribution to identify the slepton signal. We studied the trilepton plus missing E T signal and obtained the effective cross section, σ × BR × acceptance, that is needed for a 5σ discovery as a function of the cutoff mass for the LHC with center of mass energy 14 TeV and 100 fb −1 integrated luminosity. Our results are model independent such that they could be applied to other models with similar decay topology. When applied to the MSSM under simple assumptions, it is found that with 100 fb −1 integrated luminosity, a discovery reach in the left-handed slepton mass of about 600 GeV could be reached, which extends far beyond the slepton mass reach in the usual Drell-Yan studies.

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Measuring slepton masses and mixings at the LHC

Cited by 27 publications

References 38 publications

Searching for lepton flavor violation at a future high energye+e−collider

Searching for lepton flavor violation at a future high energye+e−collider

Impact of LSP character on Slepton reach at the LHC

Slepton discovery in electroweak cascade decay

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