Search for RPV SUSY resonant second generation slepton production in same-sign dimuon events at $\sqrt{s}=7$ TeV

Abstract

A search for resonant production of second generation sleptons ($\tilde{\mu}$, $\tilde{\nu}_{\mu}$) via the R-parity violating coupling $\lambda'_{211}$, with two same-sign muons and at least two jets in the final state is performed. While one muon is expected to be produced directly in the slepton decay, the second muon and at least two jets are produced in the subsequent decay of a neutralino or chargino originating from the resonant slepton. The analysis is based on the 2011 dataset of proton proton collisions at a centre of mass energy of √s = 7 TeV taken with the CMS detector, corresponding to an integrated luminosity of 4.98 fb-1. The observation is in agreement with the expectation from Standard Model processes. Limits are set within the mSUGRA framework on the coupling $\lambda'_{211}$ in the range of scalar masses $m_0$ up to 1.3 TeV and gaugino masses $m_{1/2}$ up to 1 TeV and interpreted in the $m_{\tilde{\mu}}$, $m_{\tilde{\chi}_1^0}$ mass plane.

Link to PAS

http://cds.cern.ch/record/1547780

Approved Plots from SUS-13-005

Figure Abbreviated Caption

/twiki/pub/CMSPublic/PhysicsResultsSUS13005/rpv-resonant-smuon-samesign-mumuqq.png PAS Fig. 1 (left): Resonant smuon production and typical decay chain into a final state with two same-sign muons and two jets. The R-parity violating vertices are marked by a red filled circle.

/twiki/pub/CMSPublic/PhysicsResultsSUS13005/rpv-resonant-sneutrino-chargino-mumuqq.png PAS Fig. 1 (right): Resonant sneutrino production and typical decay chain into a final state with two same-sign muons and four jets. The R-parity violating vertices are marked by a red filled circle.

/twiki/pub/CMSPublic/PhysicsResultsSUS13005/h1_5_jjmm_m.png PAS Fig. 2 (left): Invariant mass of the two muons and jets before applying the b-tag veto and same-sign muon requirement. Data are compared to the expectation from the simulation. Signal distributions are shown for three different kinematic configurations for a coupling value of $\lambda'_{211}=0.01$.
/twiki/pub/CMSPublic/PhysicsResultsSUS13005/h1_6_jjmm_m.png PAS Fig. 2 (right): Invariant mass of the two muons and jets after applying the b-tag veto and same-sign muon requirement. Data are compared to the expectation from the simulation and measured backgrounds. Signal distributions are shown for three different kinematic configurations for a coupling value of $\lambda'_{211}=0.01$.

/twiki/pub/CMSPublic/PhysicsResultsSUS13005/masses_2d.png PAS Fig. 3: Distribution of $m_{\tilde{\mu}} = m(\mbox{jets}, \mu_1^\pm , \mu_2^\pm )$ vs. $m_{\chi} = m(\mbox{jets}, \mu_2^\pm )$ for the events selected in data compared to the total background contribution. The crosses represent the data points and the coloured squares show the expectation from Standard Model backgrounds.

/twiki/pub/CMSPublic/PhysicsResultsSUS13005/l211limits_MultiBin_expected_logz-colz.png PAS Fig. 4 (top): Expected 95% CL upper limits on $\lambda'_{211}$ as a function of $m_0$ and $m_{1/2}$ for $A_0=0$, $\mbox{sign}(\mu)=+1$ and $\tan\beta=20$.
/twiki/pub/CMSPublic/PhysicsResultsSUS13005/l211limits_MultiBin_logz-colz.png PAS Fig. 4 (middle): Observed 95% CL upper limits on $\lambda'_{211}$ as a function of $m_0$ and $m_{1/2}$ for $A_0=0$, $\mbox{sign}(\mu)=+1$ and $\tan\beta=20$.
/twiki/pub/CMSPublic/PhysicsResultsSUS13005/plot_smuon_neutralino_mass_LimitsCombine.png PAS Fig. 4 (bottom): Observed 95% CL upper limits expressed in the phase space of neutralino mass and smuon mass.

/twiki/pub/CMSPublic/PhysicsResultsSUS13005/eventYieldTable.png PAS Table 1: Event yields with systematic uncertainties after selection requirements, broken down in individual Standard Model background contributions, with observed 95% C.L. limits on the number of signal events $N_{\mbox{\scriptsize sig}}$ in total and for each signal region.

Extra material

/twiki/pub/CMSPublic/PhysicsResultsSUS13005/rpv-resonant-smuon-neutralino2.png Extra material: Resonant smuon production and typical decay chain into a final state with two same-sign muons and four jets. The R-parity violating vertices are marked by a red filled circle.

/twiki/pub/CMSPublic/PhysicsResultsSUS13005/h1_5_jjm_m.png Extra material: Mass of reconstructed gaugino at first vertex. Distribution after event cleaning, requiring two muons and at least two jets.

/twiki/pub/CMSPublic/PhysicsResultsSUS13005/h1_6_jjm_m.png Extra material: Reconstructed neutralino/chargino mass with contributions from the fake background estimate (logarithmic scale).
/twiki/pub/CMSPublic/PhysicsResultsSUS13005/h1_6_jjm_m_lin.png Extra material: Reconstructed neutralino/chargino mass with contributions from the fake background estimate (linear scale).

/twiki/pub/CMSPublic/PhysicsResultsSUS13005/h1_6_jjmm_m_lin.png Extra material: Reconstructed smuon mass with contributions from the fake background estimate (linear scale).
/twiki/pub/CMSPublic/PhysicsResultsSUS13005/plot_smuon_neutralino_mass_expectedLimitsCombine.png Extra material: Expected 95% CL upper limits expressed in the phase space of neutralino mass and smuon mass.

/twiki/pub/CMSPublic/PhysicsResultsSUS13005/systUncertaintiesTable.png Extra material: Systematic uncertainties
Topic attachments
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