3 research outputs found
Comments and Reply on: Study of multi-muon events produced in p (p)over-bar interactions at root s=1.96 TeV ; T. Aaltonen et al. (The CDF Collaboration)
No full textThe European Physical Journal C-Particles and Fields-publishes scientific manuscripts of relevance to the scientific community following careful and strict peer reviewing and, whenever appropriate and necessary, through discussion with the authors, so as to optimise scientific content and style of presentation prior to publication. In some cases significant disagreement between authors and referees (and/or editors) of the journal cannot be resolved despite all efforts and best of intentions. While the journal-not with standing any appeals-retains the right to reject such manuscripts, the editors of this journal may decide, in cases deemed of exceptional interest and potential significance for the field, to accept the manuscript for publication, to amend it by comments of the editor(s) in charge and, if appropriate, by a reply of the authors of the commented manuscript. The present comment is on Study of multi-muon events produced in p (p) over bar interactions at root s = 1.96 TeV by T. Aaltonen et al. (the CDF Collaboration, Eur. Phys. J. C, 2010, doi: 10.1140/epjc/s10052-010-1336-0)
Evidence for an Excess of B[over ¯]→D^{(*)}τ^{-}ν[over ¯]_{τ} Decays
No full textBased on the full BABAR data sample, we report improved measurements of the ratios R(D(*))=B(B̅ →D(*)τ-ν̅ τ)/B(B̅ →D(*)ℓℓ-ν̅ ℓ), where ℓ is either e or μ. These ratios are sensitive to new physics contributions in the form of a charged Higgs boson. We measure R(D)=0.440±0.058±0.042 and R(D*)=0.332±0.024±0.018, which exceed the standard model expectations by 2.0σ and 2.7σ, respectively. Taken together, our results disagree with these expectations at the 3.4σ level. This excess cannot be explained by a charged Higgs boson in the type II two-Higgs-doublet model
Search for the decay modes D-0 -> e(+) e(-), D-0 -> mu(+) mu(-), and D-0 -> e(+/-) mu -/+
No full textWe present searches for the rare decay modes D-0 -> e(+) e(-), D-0 -> mu(+) mu(-), and D-0 -> e(+/-) mu(-/+) in continuum e(+) e(-) -> c (c) over bar events recorded by the BABAR detector in a data sample that corresponds to an integrated luminosity of 468 fb(-1). These decays are highly Glashow-Iliopoulos-Maiani suppressed but may be enhanced in several extensions of the standard model. Our observed event yields are consistent with the expected backgrounds. An excess is seen in the D-0 -> mu(+) mu(-) channel, although the observed yield is consistent with an upward background fluctuation at the 5% level. Using the Feldman-Cousins method, we set the following 90% confidence level intervals on the branching fractions: B(D-0 -> e(+) e(-)) mu(+) mu(-)) within [0.6,8.1] x 10(-7), and B(D-0 -> e(+/-) mu(-/+)) < 3.3 x 10(-7). RI Monge, Maria Roberta/G-9127-2012; Patrignani, Claudia/C-5223-200
