K. J. Knoepfel

activity

20042014

most citedThe Physics of the B Factories

427 citations · 3.4k across the 61 of their papers we have counts for

collaborators

Showing hep-exShow all

61 papers · 1 filter

hep-ex2014★ 427 cited

The Physics of the B Factories

A. J. Bevan, B. Golob, Th. Mannel +2003

This work is on the Physics of the B Factories. Part A of this book contains a brief description of the SLAC and KEK B Factories as well as their detectors, BaBar and Belle, and da…

hep-ex2012★ 46 cited

Measurement of B(B-->X_s γ), the B-->X_s γ photon energy spectrum, and the direct CP asymmetry in B-->X_{s+d} γ decays

The BABAR Collaboration

The photon spectrum in B --> X_s γ decay, where X_s is any strange hadronic state, is studied using a data sample of (382.8\pm 4.2) \times 10^6 e^+ e^- --> Υ(4S) --> BBbar events c…

hep-ex2012★ 87 cited

A Search for Dark Higgs Bosons

The BABAR Collaboration

Recent astrophysical and terrestrial experiments have motivated the proposal of a dark sector with GeV-scale gauge boson force carriers and new Higgs bosons. We present a search fo…

hep-ex2012★ 110 cited

Study of CP violation in Dalitz-plot analyses of B0 --> K+K-KS, B+ --> K+K-K+, and B+ --> KSKSK+

The BABAR Collaboration

We perform amplitude analyses of the decays $B^{0} \to K^{+} K^{-} K_{S}^{0}$ , $B^{+} \to K^{+} K^{-} K^{+}$ , and $B^{+} \to K_{S}^{0} K_{S}^{0} K^{+}$ , and measure CP-violating parameters and partial branc…

hep-ex2012★ 41 cited

Initial-State Radiation Measurement of the e+e- -> pi+pi-pi+pi- Cross Section

J. P. Lees, V. Poireau, V. Tisserand +383

We study the process e+e- -> pi+pi-pi+pi-gamma, with a photon emitted from the initial-state electron or positron, using 454.3 fb^-1 of data collected with the BABAR detector at SL…

hep-ex2011★ 17 cited

B0 meson decays to rho0 K0, f0 K0, and rho-K+, including higher K resonances

The BABAR Collaboration

We present branching fraction measurements for the decays B0 -> rho0 K*0, B0 -> f0 K*0, and B0 -> rho- K*+, where K* is an S-wave (K pi)_0* or a K*(892) meson; we also measure B0 -…

hep-ex2011

Observation and study of the baryonic B-meson decays B to D(*) p pbar (pi) (pi)

The BABAR Collaboration, del Amo Sanchez, others

We present results for B-meson decay modes involving a charm meson, protons, and pions using 455 x 10^6 BBbar pairs recorded by the BaBar detector at the SLAC PEP-II asymmetric-ene…

hep-ex2011★ 54 cited

Search for the $Z_{1} (4050)^{+}$ and $Z_{2} (4250)^{+}$ states in $B ˉ^{0} \to χ_{c 1} K^{-} π^{+}$ and $B^{+} \to χ_{c 1} K_{S}^{0} π^{+}$

The BABAR Collaboration, J. P. Lees

We search for the $Z_{1} (4050)^{+}$ and $Z_{2} (4250)^{+}$ states, reported by the Belle Collaboration, decaying to $χ_{c 1} π^{+}$ in the decays $B ˉ^{0} \to χ_{c 1} K^{-} π^{+}$ and $B^+ \to χ_{…

hep-ex2011★ 29 cited

Amplitude analysis and measurement of the time-dependent CP asymmetry of $B^{0} \to K_{0}^{S} K_{0}^{S} K_{0}^{S}$ decays

The BABAR Collaboration, J. P. Lees

We present the first results on the Dalitz-plot structure and improved measurements of the time-dependent CP-violation parameters of the process $B^{0} \to K_{S}^{0} K_{S}^{0} K_{S}^{0}$ …

hep-ex2011★ 7 cited

Search for Bbar --> Lambda_c+ X l- nu Decays in Events With a Fully Reconstructed B Meson

The BABAR Collaboration, J. P. Lees

We present a search for semileptonic B decays to the charmed baryon Lambda_c+ based on 420 fb-1 of data collected at the Upsilon(4S) resonance with the BABAR detector at the PEP-II…

hep-ex2011★ 34 cited

Search for the Decay D0 -> gamma gamma and Measurement of the Branching Fraction for D0 -> pi0 pi0

The BABAR Collaboration, J. P. Lees, others

We search for the rare decay of the $D^{0}$ meson to two photons, $D^{0} \to γ γ$ , and present a measurement of the branching fraction for a $D^{0}$ meson decaying to two neutra…

hep-ex2011★ 52 cited

Search for CP Violation in the Decay tau- -> pi- K^0_S (>= 0 pi0) nu_tau

The BABAR Collaboration

We report a search for CP violation in the decay τ- -> π- \K^0_S (>= 0 π0) ν_τ using a dataset of 437 million τ lepton pairs, corresponding to an integrated luminosity of 476 fb^{-…

hep-ex2011★ 19 cited

Observation of the rare decay B+->K+pi0pi0 and measurement of the quasi-two body contributions B+->K*(892)+pi0, B+->f0(980)K+ and B+->chic0K+

The BaBar Collaboration, J. P. Lees

We report an analysis of the charmless hadronic decays of charged B meson to the final state K+pi0pi0, using a data sample of 470+/-2.8 million BBbar events collected at the Y(4S)…

hep-ex2011★ 19 cited

Study of Upsilon(3S,2S) -> eta Upsilon(1S) and Upsilon(3S,2S) -> pi+pi- Upsilon(1S) hadronic trasitions

The BABAR Collaboration, J. P. Lees, others

We study the Upsilon(3S,2S)->eta Upsilon(1S) and Upsilon(3S,2S)->pi+pi- Upsilon(1S) transitions with 122 million Upsilon(3S) and 100 million Upsilon(2S) mesons collected by the BaB…

hep-ex2011★ 17 cited

Search for CP violation using $T$ -odd correlations in $D^{+} \to K^{+} K_{S}^{0} π^{+} π^{-}$ and $D_{s}^{+} \to K^{+} K_{S}^{0} π^{+} π^{-}$ decays

The BABAR Collaboration, J. P. Lees

We search for CP violation in a sample of 20000 Cabibbo-suppressed decays, $D^{+} \to K^{+} K_{S}^{0} π^{+} π^{-}$ , and 30000 Cabibbo-favored decays, $D_{s}^{+} \to K^{+} K_{S}^{0} π^{+} π^{-}$ . We…

hep-ex2011★ 17 cited

Measurement of the mass and width of the Ds1(2536)+ meson

The BABAR Collaboration, J. P. Lees

The decay width and mass of the Ds1(2536)+ meson are measured via the decay channel Ds1+ -> D*+KS0 using 385 fb^-1 of data recorded with the BABAR detector in the vicinity of the Y…

hep-ex2011★ 123 cited

Measurement of the gamma gamma* --> eta and gamma gamma* --> eta' transition form factors

The BABAR Collaboration

We study the reactions e+e- --> e+e- eta (eta') in the single-tag mode and measure the gamma gamma* --> eta (eta') transition form factors in the momentum transfer range from 4 to…

hep-ex2010★ 23 cited

Observation of the Decay B^{-} \rightarrow D_{s}^{(*)+} K^{-} \ell^{-} \barν_{\ell}

The BABAR Collaboration, P. del Amo Sanchez

We report the observation of the decay $B^{-} \to D_{s}^{(*) +} K^{-} ℓ^{-} ν ˉ_{ℓ}$ based on $342 \mathrm {\,fb}^{-1}}$ of data collected at the $\Y4S$ resonance wi…

hep-ex2010

Studies of tau- -> eta.K-.nu and tau- -> eta.pi-.nu at BaBar and a search for a second-class current

The BaBar Collaboration, P. del Amo Sanchez

We report on analyses of tau lepton decays $τ^{-} \to η K^{-} ν_{τ}$ and $τ^{-} \to η π^{-} ν_{τ}$ , with $η \to π^{+} π^{-} π^{0}$ , using 470 fb $^{- 1}$ of data from the Babar experiment at PEP-II, coll…

hep-ex2010★ 42 cited

Measurement of the B^0 --> pi^-ell^+nu and B^+ --> eta^(')ell^+nu Branching Fractions, the B^0 --> pi^-ell^+nu and B^+ --> eta ell^+nu Form-Factor Shapes, and Determination of |V_{ub}|

The BABAR Collaboration, P. del Amo Sanchez etal

We report the results of a study of the exclusive charmless semileptonic decays, $B^{+} \to η^{(')} ℓ^{+} ν$ and $B^{0} \to π^{-} ℓ^{+} ν$ , undertaken wi…

hep-ex2010★ 36 cited

Exclusive Production of $D_{s}^{+} D_{s}^{-}$ , $D_{s}^{+} D_{s}^{-}$ , and $D_{s}^{+} D_{s}^{*-}$ via $e^{+} e^{-}$ Annihilation with Initial-State-Radiation

The BABAR Collaboration, P. del Amo Sanchez et al.

We perform a study of exclusive production of $D_{s}^{+} D_{s}^{-}$ , $D_{s}^{*+} D_{s}^{-}$ , and $D_{s}^{*+} D_{s}^{*-}$ final states in initial-state-radiation events from $e^{+} e^{-}$ annihilations at a…

hep-ex2010★ 46 cited

Measurement of the Absolute Branching Fractions for $D_{s}^{-} \to ℓ^{-} ν ˉ_{ℓ}$ and Extraction of the Decay Constant $f_{D_{s}}$

The BABAR Collaboration, P. del Amo Sanches

The absolute branching fractions for the decays $D_{s}^{-} \to ℓ^{-} ν ˉ_{ℓ}$ ( $ℓ = e$ , $μ$ , or $τ$ ) are measured using a data sample corresponding to an integrated lum…

hep-ex2010

Observation of the decay B0bar -> LambdaC antiproton pi0

The BABAR Collaboration, B. Aubert et al.

In a sample of 467 million $B B$ pairs collected with the BABAR detector at the PEP-II collider at SLAC we have observed the decay $\overline{B}^0\rightarrowΛ_c^+{\overlin…

hep-ex2010★ 206 cited

Evidence for the decay X(3872) --> J/psi omega

P. del Amo Sanchez et al.

We present a study of the decays B^{0,+} --> J/psi pi^+ pi^- pi^0 K^{0,+}, using 467 10^6 BBbar pairs recorded with the BABAR detector. We present evidence for the decay mode X(387…

The Physics of the B Factories

Measurement of B(B-->X_s γ), the B-->X_s γ photon energy spectrum, and the direct CP asymmetry in B-->X_{s+d} γ decays

A Search for Dark Higgs Bosons

Study of CP violation in Dalitz-plot analyses of B0 --> K+K-KS, B+ --> K+K-K+, and B+ --> KSKSK+

Initial-State Radiation Measurement of the e+e- -> pi+pi-pi+pi- Cross Section

B0 meson decays to rho0 K*0, f0 K*0, and rho-K*+, including higher K* resonances

Observation and study of the baryonic B-meson decays B to D(*) p pbar (pi) (pi)

Search for the Z1​(4050)+ and Z2​(4250)+ states in Bˉ0→χc1​K−π+ and B+→χc1​KS0​π+

Amplitude analysis and measurement of the time-dependent CP asymmetry of B0→K0S​K0S​K0S​ decays

Search for Bbar --> Lambda_c+ X l- nu Decays in Events With a Fully Reconstructed B Meson

Search for the Decay D0 -> gamma gamma and Measurement of the Branching Fraction for D0 -> pi0 pi0

Search for CP Violation in the Decay tau- -> pi- K^0_S (>= 0 pi0) nu_tau

Observation of the rare decay B+->K+pi0pi0 and measurement of the quasi-two body contributions B+->K*(892)+pi0, B+->f0(980)K+ and B+->chic0K+

Study of Upsilon(3S,2S) -> eta Upsilon(1S) and Upsilon(3S,2S) -> pi+pi- Upsilon(1S) hadronic trasitions

Search for CP violation using T-odd correlations in D+→K+KS0​π+π− and Ds+​→K+KS0​π+π− decays

Measurement of the mass and width of the Ds1(2536)+ meson

Measurement of the gamma gamma* --> eta and gamma gamma* --> eta' transition form factors

Observation of the Decay B^{-} \rightarrow D_{s}^{(*)+} K^{-} \ell^{-} \barν_{\ell}

Studies of tau- -> eta.K-.nu and tau- -> eta.pi-.nu at BaBar and a search for a second-class current

Measurement of the B^0 --> pi^-ell^+nu and B^+ --> eta^(')ell^+nu Branching Fractions, the B^0 --> pi^-ell^+nu and B^+ --> eta ell^+nu Form-Factor Shapes, and Determination of |V_{ub}|

Exclusive Production of Ds+​Ds−​, Ds∗+​Ds−​, and Ds∗+​Ds∗−​ via e+e− Annihilation with Initial-State-Radiation

Measurement of the Absolute Branching Fractions for Ds−​→ℓ−νˉℓ​ and Extraction of the Decay Constant fDs​​

Observation of the decay B0bar -> LambdaC antiproton pi0

Evidence for the decay X(3872) --> J/psi omega

B0 meson decays to rho0 K0, f0 K0, and rho-K+, including higher K resonances

Search for the $Z_{1} (4050)^{+}$ and $Z_{2} (4250)^{+}$ states in $B ˉ^{0} \to χ_{c 1} K^{-} π^{+}$ and $B^{+} \to χ_{c 1} K_{S}^{0} π^{+}$

Amplitude analysis and measurement of the time-dependent CP asymmetry of $B^{0} \to K_{0}^{S} K_{0}^{S} K_{0}^{S}$ decays

Search for CP violation using $T$ -odd correlations in $D^{+} \to K^{+} K_{S}^{0} π^{+} π^{-}$ and $D_{s}^{+} \to K^{+} K_{S}^{0} π^{+} π^{-}$ decays

Exclusive Production of $D_{s}^{+} D_{s}^{-}$ , $D_{s}^{+} D_{s}^{-}$ , and $D_{s}^{+} D_{s}^{*-}$ via $e^{+} e^{-}$ Annihilation with Initial-State-Radiation

Measurement of the Absolute Branching Fractions for $D_{s}^{-} \to ℓ^{-} ν ˉ_{ℓ}$ and Extraction of the Decay Constant $f_{D_{s}}$