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• W2200757924 abstract "A search is reported for a light pseudoscalar A boson decaying to a pair of tau leptons, produced in association with a pair of b quarks, in the context of two-Higgs-doublet models. The results are based on pp collision data at a centre-of-mass energy of s = sqrt(8) TeV accumulated by the CMS experiment at the LHC and corresponding to an integrated luminosity of 19.7 fb−1. Pseudoscalar A boson masses are probed between 25 and 80 GeV and upper limits are set on the production cross section times branching fraction to tau pairs between 7 and 39 pb at the 95pct confidence level. For masses below 80 GeV, this search excludes the pseudoscalar A boson in Type 2 two-Higgs-doublet models with negative Yukawa coupling to down-type fermions. Presented at EPS-HEP 2015 European Physical Society Conference on High Energy Physics 2015 Search for a low-mass pseudoscalar Higgs boson produced in association with a pair of b-quarks and decaying to tau leptons at CMS Cecile Caillol∗† IIHE Universite Libre de Bruxelles (ULB) E-mail: ccaillol@cern.ch A search is reported for a light pseudoscalar A boson decaying to a pair of τ leptons, produced in association with a pair of b quarks, in the context of two-Higgs-doublet models. The results are based on pp collision data at a centre-of-mass energy of √ s = 8 TeV accumulated by the CMS experiment at the LHC and corresponding to an integrated luminosity of 19.7 fb−1. Pseudoscalar A boson masses are probed between 25 and 80 GeV and upper limits are set on the production cross section times branching fraction to τ pairs between 7 and 39 pb at the 95% confidence level. For masses below 80 GeV, this search excludes the pseudoscalar A boson in Type 2 two-Higgsdoublet models with negative Yukawa coupling to down-type fermions. The European Physical Society Conference on High Energy Physics 22–29 July 2015 Vienna, Austria ∗Speaker. †On behalf of the CMS Collaboration. c © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0). http://pos.sissa.it/ Search for a light pseudoscalar boson decaying to taus at CMS Cecile Caillol 1. Motivation The standard model (SM) of particle physics is known to lack answer for several fundamental questions such as the dark matter existence or the matter-antimatter asymmetry, which points to the existence for physics beyond the SM. Some models predict the existence of an extended scalar sector. Among them, two-Higgs-doublet models (2HDMs) [1] introduce two scalar doublets, which, after SU(2)L symmetry breaking, lead to five physical states: two CP-even (h and H), one CPodd (A), and two charged (H±) bosons. Six parameters describe the scalar sector: the four Higgs masses, the ratio of the vacuum expectation values of the doublets tanβ , and the mixing angle of the two neutral CP-even states α . In addition, another mixing parameter, m12, is introduced in case the Z2 symmetry is softly broken. In the alignment limit, h can be SM-like with a mass of 125 GeV, while A can be lighter. In Type 2 of 2HDMs, and when the Higgs coupling to the third generation of fermions is enhanced, the production of a light A boson in association with b quarks can be sizeable, especially if the Yukawa coupling of the A boson to down-type fermions is negative [2]. This analysis searches for a light pseudoscalar with a mass between 25 and 80 GeV, decaying to tau leptons and produced in association with b quarks [3]. The results are based on pp collision data at a centre-of-mass energy of √ s = 8 TeV accumulated by the CMS experiment at the LHC and corresponding to an integrated luminosity of 19.7 fb−1. A complete description of the CMS detector can be found in [4]. 2. Selection Three different di-tau final states, corresponding to different tau decays (hadronic decays are noted τh, leptonic decays with an electron τe and leptonic decays with a muon τμ ) are studied: τeτμ , τeτh and τμτh. Other final states are discarded because of low branching fractions and large backgrounds (τeτe and τμτμ ), or high pT trigger thresholds (τhτh). The lepton pT thresholds are constrained by the di-lepton trigger paths used to trigger the events; 22 GeV for hadronic taus, 18 GeV for muons in μτh final state, 24 GeV for electrons in eτh final state, and 10 GeV for the muon and 20 GeV for the electron in the eμ final state, or 18 GeV for the muon and 10 GeV for the electron depending on the trigger path fired. The hadronic taus are identified with the multivariate version of the Hadron Plus Strips algorithm, which includes lifetime information on top of classical isolation variables [5]. The ~ pmiss T is defined as the projection on the plane perpendicular to the beams of the negative vector sum of the momenta of all PF candidates reconstructed in an event. Its magnitude is referred to as Emiss T . To reduce the contribution of the W+jets background in the τeτh and τμτh final states, events with the transverse mass MT of the lepton and the missing transverse energy Emiss T larger than 30 GeV are discarded, where the transverse mass is defined as: MT(l, ~ pmiss T ) = √ 2pT E miss T (1− cos∆φ), (2.1) where pT is the transverse momentum of the lepton (muon or electron) and ∆φ is the azimuthal angle between the lepton and the ~ pmiss T ." @default.
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• W2200757924 date "2015-09-28" @default.
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• W2200757924 title "Search for a low-mass pseudoscalar Higgs boson produced in association with a pair of b-quarks and decaying to tau leptons at CMS" @default.
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