Universitat de Barcelona

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Showing 2012 · hep-exShow all

84 papers · 2 filters

hep-ex2012★ 11 cited

First observation of the decays $B ˉ_{(s)}^{0} \to D_{s}^{+} K^{-} π^{+} π^{-}$ and $B ˉ_{s}^{0} \to D_{s 1} (2536)^{+} π^{-}$

LHCb collaboration, R. Aaij, C. Abellan Beteta +621

The first observation of the decays $B ˉ_{s}^{0} \to D_{s}^{+} K^{-} π^{+} π^{-}$ and $B ˉ^{0} \to D_{s}^{+} K^{-} π^{+} π^{-}$ are reported using an integrated luminosity of 1.0 fb $^{- 1}$ recorded by the…

hep-ex2012★ 17 cited

Measurement of CP observables in B0 -> D K*0 with D -> K+ K-

LHCb collaboration, R. Aaij, C. Abellan Beteta +625

The decay B0 -> D K*0 and the charge conjugate mode are studied using 1.0fb-1 of pp collision data collected by the LHCb experiment at sqrt(s) = 7TeV in 2011. The CP asymmetry betw…

hep-ex2012★ 26 cited

Measurement of the forward energy flow in pp collisions at sqrt(s)=7 TeV

LHCb collaboration, R. Aaij, C. Abellan Beteta +628

The energy flow created in pp collisions at sqrt(s)=7 TeV is studied within the pseudorapidity range 1.9<eta<4.9 with data collected by the LHCb experiment. The measurements are pe…

hep-ex2012★ 20 cited

Search for CP violation in the Decays $D^{\pm} \to K_{S}^{0} K^{\pm}$ , $D_{s}^{\pm} \to K_{S}^{0} K^{\pm}$ , and $D_{s}^{\pm} \to K_{S}^{0} π^{\pm}$

The BABAR Collaboration, J. P. Lees, others

We report a search for CP violation in the decay modes $D^{\pm} \to K_{S}^{0} K^{\pm}$ , $D_{s}^{\pm} \to K_{S}^{0} K^{\pm}$ , and $D_s^{\pm}\to K^0_{\scr…

hep-ex2012★ 17 cited

Search for direct CP-violation in singly-Cabibbo suppressed D+- --> K+ K- pi+- decays

BaBar Collaboration, J. P. Lees, V. Poireau +359

We report on a search for direct CP asymmetry in the singly Cabibbo-suppressed decay D+- --> K+ K- pi+- using a data sample of 476 fb-1 accumulated with the BaBar detector running…

hep-ex2012★ 53 cited

Measurement of J/psi production in pp collisions at sqrt(s)=2.76 TeV

LHCb collaboration, R. Aaij, C. Abellan Beteta +624

The production of J/psi mesons is studied with the LHCb detector using data from pp collisions at sqrt(s)=2.76 TeV corresponding to an integrated luminosity of 71 nb^-1. The differ…

hep-ex2012★ 391 cited

First evidence for the decay Bs -> mu+ mu-

LHCb collaboration, R. Aaij, C. Abellan Beteta +617

A search for the rare decays Bs->mu+mu- and B0->mu+mu- is performed using data collected in 2011 and 2012 with the LHCb experiment at the Large Hadron Collider. The data samples co…

hep-ex2012★ 26 cited

Measurement of the time-dependent CP asymmetry in B0 -> J/ψ KS0 decays

LHCb collaboration, R. Aaij, C. Abellan Beteta +622

This Letter reports a measurement of the CP violation observables S_J/ψKS0 and C_J/ψKS0 in the decay channel B0 -> J/ψ KS0 performed with 1.0/fb of pp collisions at sqrt(s) = 7 TeV…

hep-ex2012★ 62 cited

First observation of the decay $B_{s 2}^{} (5840)^{0} \to B^{+} K^{-}$ and studies of excited $B_{s}$ mesons

LHCb collaboration, R. Aaij, C. Abellan Beteta +621

Properties of the orbitally excited (L=1) $B_{s}$ states are studied using 1.0 fb $^{- 1}$ of pp collisions at $s = 7$ TeV collected with the LHCb detector. The first observation…

hep-ex2012★ 629 cited

The LHCb Trigger and its Performance in 2011

R. Aaij, J. Albrecht, F. Alessio +80

This paper presents the design of the LHCb trigger and its performance on data taken at the LHC in 2011. A principal goal of LHCb is to perform flavour physics measurements, and th…

hep-ex2012★ 91 cited

Observation of D0-D0bar oscillations

LHCb collaboration, R. Aaij, C. Abellan Beteta +616

We report a measurement of the time-dependent ratio of D0->K+pi- to D0->K-pi+ decay rates in D*+-tagged events using 1.0 fb^{-1} of integrated luminosity recorded by the LHCb exper…

hep-ex2012★ 59 cited

Measurement of the ratio of branching fractions BR(B0 -> K0 gamma)/BR(Bs0 -> phi gamma) and the direct CP asymmetry in B0 -> K0 gamma

LHCb collaboration, R. Aaij, C. Abellan Beteta +621

The ratio of branching fractions of the radiative B decays B0 -> K*0 gamma and Bs0 phi gamma has been measured using an integrated luminosity of 1.0 fb-1 of pp collision data colle…

hep-ex2012★ 48 cited

Search for a Low-Mass Scalar Higgs Boson Decaying to a Tau Pair in Single-Photon Decays of Upsilon(1S)

J. P. Lees, others

We search for a low-mass scalar CP-odd Higgs boson, A0, produced in the radiative decay of the Upsilon resonance and decaying into a tau+tau- pair: Upsilon(1S)->gamma A0. The produ…

hep-ex2012★ 44 cited

Evidence for the decay $B^{0} \to J / ψ ω$ and measurement of the relative branching fractions of $B_{s}^{0}$ meson decays to $J / ψ η$ and $J / ψ η^{^{'}}$

LHCb Collaboration, R. Aaij, C. Abellan Beteta +620

First evidence of the $B^{0} \to J / ψ ω$ decay is found and the $B_{s}^{0} \to J / ψ η$ and $B_{s}^{0} \to J / ψ η^{'}$ decays are studied using a dataset corresponding to an integrated lumino…

hep-ex2012★ 42 cited

A model-independent Dalitz plot analysis of $B^{\pm} \to D K^{\pm}$ with $D \to K_{S}^{0} h^{+} h^{-}$ ( $h = π, K$ ) decays and constraints on the CKM angle $γ$

LHCb collaboration, R. Aaij, C. Abellan Beteta +617

A binned Dalitz plot analysis of $B^{\pm} \to D K^{\pm}$ decays, with $D \to K_{S}^{0} π^{+} π^{-}$ and $D \to K_{S}^{0} K^{+} K^{-}$ , is performed to measure the CP-violating observables $…

hep-ex2012★ 28 cited

Measurement of the $B^{0}$ -- $B ˉ^{0}$ oscillation frequency $Δ m_{d}$ with the decays $B^{0} \to D^{-} π^{+}$ and $B^{0} \to J / ψ K^{* 0}$

LHCb collaboration, R. Aaij, C. Abellan Beteta +621

The $B^{0}$ -- $B ˉ^{0}$ oscillation frequency $Δ m_{d}$ is measured by the LHCb experiment using a dataset corresponding to an integrated luminosity of $1.0$ fb $^{- 1}$ of proton-proton…

hep-ex2012★ 39 cited

Measurement of the CP asymmetry in B0 -> K*0 mu+ mu- decays

LHCb collaboration, R. Aaij, C. Abellan Beteta +620

A measurement of the CP asymmetry in B0 -> K*0 mu+ mu- decays is presented, based on 1.0fb-1 of pp collision data recorded by the LHCb experiment during 2011. The measurement is pe…

hep-ex2012★ 76 cited

Measurement of the D+/- production asymmetry in 7 TeV pp collisions

LHCb collaboration, R. Aaij, C. Abellan Beteta +619

The asymmetry in the production cross-section σof D+/- mesons, A_P = (σ(D+) - σ(D-))/(σ(D+) + σ(D-)), is measured in bins of pseudorapidity ηand transverse momentum p_T within the…

hep-ex2012★ 46 cited

First observation of the decay $B^{+} \to π^{+} μ^{+} μ^{-}$

LHCb Collaboration, R. Aaij, C. Abellan Beteta +621

A discovery of the rare decay $B^{+} \to π^{+} μ^{+} μ^{-}$ is presented. This decay is observed for the first time, with 5.2 $σ$ significance. The observation is made usin…

hep-ex2012★ 17 cited

First evidence for the annihilation decay mode $B^{+} \to D_{s}^{+} ϕ$

LHCb collaboration, R. Aaij, C. Abellan Beteta +617

Evidence for the hadronic annihilation decay mode $B^{+} \to D_{s}^{+} ϕ$ is found with greater than $3 σ$ significance. The branching fraction and \CP asymmetry are measured to be \ma…

hep-ex2012★ 5 cited

Search for di-muon decays of a low-mass Higgs boson in radiative decays of the Υ(1S)

The BABAR collaboration

We search for di-muon decays of a low-mass Higgs boson (A^0) produced in radiative Υ(1S) decays. The Υ(1S) sample is selected by tagging the pion pair in the Υ(2S, 3S) \to π^+ π^-…

hep-ex2012★ 105 cited

Differential branching fraction and angular analysis of the $B^{+} \to K^{+} μ^{+} μ^{-}$ decay

LHCb collaboration, R. Aaij, C. Abellan Beteta +617

The angular distribution and differential branching fraction of the decay $B^{+} \to K^{+} μ^{+} μ^{-}$ are studied with a dataset corresponding to $1.0 fb^{- 1}$ of…

hep-ex2012★ 52 cited

Measurement of D0-D0bar Mixing and CP Violation in Two-Body D0 Decays

J. P. Lees, others

We present a measurement of D0-D0bar mixing and CP violation using the ratio of lifetimes simultaneously extracted from a sample of D0 mesons produced through the flavor-tagged pro…

hep-ex2012★ 40 cited

Study of high-multiplicity 3-prong and 5-prong tau decays at BABAR

J. P. Lees

We present measurements of the branching fractions of 3-prong and 5-prong tau decay modes using a sample of 430 million tau lepton pairs, corresponding to an integrated luminosity…

First observation of the decays Bˉ(s)0​→Ds+​K−π+π− and Bˉs0​→Ds1​(2536)+π−

Measurement of CP observables in B0 -> D K*0 with D -> K+ K-

Measurement of the forward energy flow in pp collisions at sqrt(s)=7 TeV

Search for CP violation in the Decays D±→KS0​K±, Ds±​→KS0​K±, and Ds±​→KS0​π±

Search for direct CP-violation in singly-Cabibbo suppressed D+- --> K+ K- pi+- decays

Measurement of J/psi production in pp collisions at sqrt(s)=2.76 TeV

First evidence for the decay Bs -> mu+ mu-

Measurement of the time-dependent CP asymmetry in B0 -> J/ψ KS0 decays

First observation of the decay Bs2∗​(5840)0→B∗+K− and studies of excited Bs​ mesons

The LHCb Trigger and its Performance in 2011

Observation of D0-D0bar oscillations

Measurement of the ratio of branching fractions BR(B0 -> K*0 gamma)/BR(Bs0 -> phi gamma) and the direct CP asymmetry in B0 -> K*0 gamma

Search for a Low-Mass Scalar Higgs Boson Decaying to a Tau Pair in Single-Photon Decays of Upsilon(1S)

Evidence for the decay B0→J/ψω and measurement of the relative branching fractions of Bs0​ meson decays to J/ψη and J/ψη′

A model-independent Dalitz plot analysis of B±→DK± with D→KS0​h+h− (h=π,K) decays and constraints on the CKM angle γ

Measurement of the B0--Bˉ0 oscillation frequency Δmd​ with the decays B0→D−π+ and B0→J/ψK∗0

Measurement of the CP asymmetry in B0 -> K*0 mu+ mu- decays

Measurement of the D+/- production asymmetry in 7 TeV pp collisions

First observation of the decay B+→π+μ+μ−

First evidence for the annihilation decay mode B+→Ds+​ϕ

Search for di-muon decays of a low-mass Higgs boson in radiative decays of the Υ(1S)

Differential branching fraction and angular analysis of the B+→K+μ+μ− decay

Measurement of D0-D0bar Mixing and CP Violation in Two-Body D0 Decays

Study of high-multiplicity 3-prong and 5-prong tau decays at BABAR

First observation of the decays $B ˉ_{(s)}^{0} \to D_{s}^{+} K^{-} π^{+} π^{-}$ and $B ˉ_{s}^{0} \to D_{s 1} (2536)^{+} π^{-}$

Search for CP violation in the Decays $D^{\pm} \to K_{S}^{0} K^{\pm}$ , $D_{s}^{\pm} \to K_{S}^{0} K^{\pm}$ , and $D_{s}^{\pm} \to K_{S}^{0} π^{\pm}$

First observation of the decay $B_{s 2}^{} (5840)^{0} \to B^{+} K^{-}$ and studies of excited $B_{s}$ mesons

Measurement of the ratio of branching fractions BR(B0 -> K0 gamma)/BR(Bs0 -> phi gamma) and the direct CP asymmetry in B0 -> K0 gamma

Evidence for the decay $B^{0} \to J / ψ ω$ and measurement of the relative branching fractions of $B_{s}^{0}$ meson decays to $J / ψ η$ and $J / ψ η^{^{'}}$

A model-independent Dalitz plot analysis of $B^{\pm} \to D K^{\pm}$ with $D \to K_{S}^{0} h^{+} h^{-}$ ( $h = π, K$ ) decays and constraints on the CKM angle $γ$

Measurement of the $B^{0}$ -- $B ˉ^{0}$ oscillation frequency $Δ m_{d}$ with the decays $B^{0} \to D^{-} π^{+}$ and $B^{0} \to J / ψ K^{* 0}$

First observation of the decay $B^{+} \to π^{+} μ^{+} μ^{-}$

First evidence for the annihilation decay mode $B^{+} \to D_{s}^{+} ϕ$

Differential branching fraction and angular analysis of the $B^{+} \to K^{+} μ^{+} μ^{-}$ decay