2013-03-08
17:11 |
Observation of the decay $B_c^+ \to \psi(2S)\pi^+$
/ LHCb Collaboration
The decay $B_c^+ \to \psi(2S)\pi^+$ with $\psi(2S) \to \mu^+\mu^-$ is observed with a significance of $5.2\,\sigma$ using $pp$ collision data corresponding to an integrated luminosity of 1.0 $fb^{-1}$ collected by the LHCb experiment. The branching fraction of $B_c^+ \to \psi(2S)\pi^+$ decays relative to that of the $B_c^+ \to J/\psi\pi^+$ mode is measured to be \begin{equation*} \frac{\mathcal{B}(B_c^+ \to \psi(2S)\pi^+)}{\mathcal{B}(B_c^+ \to J/\psi\pi^+)} = 0.250 \pm 0.068 \,\text{stat} \pm 0.014 \,\text{\syst} \pm 0.006 \,(\mathcal{B}). [...]
arXiv:1303.1737; LHCB-PAPER-2012-054; CERN-PH-EP-2013-028.-
Geneva : CERN, 2013 - 12 p.
- Published in : Phys. Rev. D 87 (2013) 071103
APS Open Access article: PDF; Related data file(s): ZIP; External link: Preprint
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2013-02-27
11:54 |
Observation of the $B^0_{s}\to\psi{(2\mathrm{S})}\eta$ and $B^0_{(s)}\to\psi{(2\mathrm{S})}\pi^+\pi^-$ decays
/ LHCb Collaboration
First observations of the $B^0_s \rightarrow \psi(2S) \eta$, $B^0 \rightarrow \psi(2S) \pi^+ \pi^-$ and $B^0_s \rightarrow \psi(2S) \pi^+ \pi^-$ decays are made using a dataset corresponding to an integrated luminosity of 1.0 $fb^{-1}$ collected by the LHCb experiment in proton-proton collisions at a centre-of-mass energy of $\sqrt{s}=7$ TeV. The ratios of the branching fractions of each of the $\psi(2S)$ modes with respect to the corresponding $J/\psi$ decays are \[ \frac{\mathcal{B}(B^0_s \rightarrow \psi(2S) \eta) }{\mathcal{B}(B^0_s \rightarrow J/\psi \eta)} =0.83\pm0.14\,(stat)\pm0.12\,(syst)\pm0.02\,(\mathcal{B}), \] \[ \frac{\mathcal{B}(B^0 \rightarrow \psi(2S) \pi^+ \pi^-)}{\mathcal{B}(B^0 \rightarrow J/\psi \pi^+ \pi^-)} =0.56\pm0.07\,(stat)\pm0.05\,(syst)\pm0.01\,(\mathcal{B}), \] \[ \frac{\mathcal{B}(B^0_s \rightarrow \psi(2S) \pi^+ \pi^-)}{\mathcal{B}(B^0_s \rightarrow J/\psi \pi^+ \pi^-)} =0.34\pm0.04\,(stat)\pm0.03\,(syst)\pm0.01\,(\mathcal{B}), \] where the third uncertainty corresponds to the uncertainties of the dilepton branching fractions of the $J/\psi$ and $\psi$(2S) meson decays..
arXiv:1302.6354; CERN-PH-EP-2013-024; LHCB-PAPER-2012-053.-
Geneva : CERN, 2013 - 16 p.
- Published in : Nucl. Phys. B 871 (2013) 403-419
Elsevier Open Access article: PDF; Related data file(s): ZIP; External link: Preprint
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2013-02-11
19:15 |
Study of the underlying event at forward rapidity in pp collisions at $\sqrt{s}$ = 0.9, 2.76, and 7 TeV
/ CMS Collaboration
The underlying event activity in proton-proton collisions at forward pseudorapidity (-6.6 $\lt \eta \lt$ -5.2) is studied with the CMS detector at the LHC, using a novel observable: the ratio of the forward energy density, dE/d$\eta$, for events with a charged-particle jet produced at central pseudorapidity (abs(eta[jet]) $\lt$ 2) to the forward energy density for inclusive events. This forward energy density ratio is measured as a function of the central jet transverse momentum, pt, at three different pp centre-of-mass energies ($\sqrt{s}$ = 0.9, 2.76, and 7 TeV). [...]
arXiv:1302.2394; CMS-FWD-11-003; CERN-PH-EP-2013-012.-
Geneva : CERN, 2013 - 33 p.
- Published in : J. High Energy Phys. 04 (2013) 072
Springer Open Access article: PDF; External link: Preprint
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2013-01-30
16:51 |
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2013-01-25
14:22 |
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2013-01-25
13:31 |
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2013-01-20
23:18 |
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2012-12-30
15:58 |
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2012-12-28
17:40 |
A search for prompt lepton-jets in pp collisions at $\sqrt{s}$ = 7 TeV with the ATLAS detector
/ ATLAS Collaboration
We present a search for a light (mass < 2 GeV) boson predicted by Hidden Valley supersymmetric models that decays into a final state consisting of collimated muons or electrons, denoted "lepton-jets". The analysis uses 5fb-1 of $\sqrt{s}$ = 7 TeV proton--proton collision data recorded by the ATLAS detector at the Large Hadron Collider to search for the following signatures: single lepton-jets with at least four muons; pairs of lepton-jets, each with two or more muons; and pairs of lepton-jets with two or more electrons. [...]
arXiv:1212.5409; CERN-PH-EP-2012-319.-
Geneva : CERN, 2013 - 24 p.
- Published in : Phys. Lett. B 719 (2013) 299-317
Elsevier Open Access article: PDF; External links: Previous draft version; Preprint
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2012-12-28
15:56 |
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