V. E. Blinov

The branching fraction measurements of $J/ψ$ decay into $ρη$ and $ϕη$ final states

KEDR Collaboration, В.В. Анашин, O. V. Anchugov, K. V. Astrelina et autres

We present measurements of the branching fractions for the $J/ψ$ meson decays into the $ρη$ and $ϕη$ final states, based on data collected with the KEDR detector at the VEPP-4M collider. The data set consisted of 4.93 million $J/ψ$ events. The resulting …

Measurement of $$J/\psi $$ decays into final states $$2(\pi ^{+}\pi ^{-})\pi ^{0},K^{+}K^{-}\pi ^{+}\pi ^{-}\pi ^{0},\,2(\pi ^{+}\pi ^{-})$$ and $$K^{+}K^{-}\pi ^{+}\pi ^{-}$$

В.В. Анашин, О. В. Анчугов, Vladimir M. Aulchenko, E. M. Baldin et autres

Abstract Using the 1.32 $$\hbox {pb}^{-1}$$ pb - 1 statistics collected at the $$J/\psi $$ J / ψ peak with the KEDR detector at the VEPP-4M $$e^{+}e^{-\, }$$ e + e - collider, we measured the branching fractions of $$J/\psi $$ J …

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Study of the process e+e−→π+π−π0 using initial state radiation with BABAR

J. P. Lees, Vincent Poireau, V. Tisserand, E. Graugés et autres

The process ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}\ensuremath{\gamma}$ is studied at a center-of-mass energy near the $\mathrm{\ensuremath{\Upsilon}}(4S)$ resonance using a data sample of $469\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ collected with the BABAR detector at the PEP-II collider. We have performed a precise measurement of the ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$ cross section in …

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Light meson spectroscopy from Dalitz plot analyses of ηc decays to η′K+K− , η′π+π− , and ηπ+π− produced in two-photon interactions

J.-P. Lees, Vincent Poireau, V. Tisserand, E. Graugés et autres

We study the processes $\ensuremath{\gamma}\ensuremath{\gamma}\ensuremath{\rightarrow}{\ensuremath{\eta}}_{c}\ensuremath{\rightarrow}{\ensuremath{\eta}}^{\ensuremath{'}}{K}^{+}{K}^{\ensuremath{-}}$, ${\ensuremath{\eta}}^{\ensuremath{'}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$, and $\ensuremath{\eta}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ using a data sample of $519\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ recorded with the BABAR detector operating at the SLAC PEP-II asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider at center-of-mass energies at and near the $\mathrm{\ensuremath{\Upsilon}}(nS)$ ($n=2$, 3, 4) resonances. This …

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Status of laser polarimeter at VEPP-4M

V. E. Blinov, Tatiana V. Bedareva, S. A. Zakharov, V. V. Kaminskiy et autres

Laser polarimeter facility at VEPP-4M accelerator is designed to calibrate the beam energy by resonance depolarization method in the energy region of the Υ-meson. The laser trigger and laser polarization control system has been upgraded. A new water-cooled vacuum mirror is being …

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Laser Polarimeter at VEPP-4M

V. E. Blinov, Vladimir Ivakin, V. V. Kaminskiy, V. Kudryavtsev et autres

A laser polarimeter at the VEPP-4M storage ring is being developed for the beam energy calibration by the resonant depolarization method in the future high-precision measurements of the Υ meson masses with the KEDR detector. The status of the laser polarimeter and …

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Search for Long-Lived Particles in e+e− Collisions

J. P. Lees, Vincent Poireau, V. Tisserand, E. Graugés et autres

We present a search for a neutral, long-lived particle $L$ that is produced in ${e}^{+}{e}^{\ensuremath{-}}$ collisions and decays at a significant distance from the ${e}^{+}{e}^{\ensuremath{-}}$ interaction point into various flavor combinations of two oppositely charged tracks. The analysis uses an ${e}^{+}{e}^{\ensuremath{-}}$ data …

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Measurement of the Branching Fractions of the Radiative Leptonic τ Decays τ → eγν[bar over ν] and τ → μγν[bar over ν] at BABAR

J. P. Lees, Vincent Poireau, V. Tisserand, E. Graugés et autres

We perform a measurement of the τ → lγν[bar over ν] (l = e,μ) branching fractions for a minimum photon energy of 10 MeV in the τ rest frame, using 431 fb[superscript -1] of e[superscript +]e[superscript -] collisions collected at the center-of-mass …

Measurement of Collins asymmetries in inclusive production of charged pion pairs in e[superscript +]e[superscript −] annihilation at BABAR

J. P. Lees, V. Poireau, V. Tisserand, E. Graugés et autres

We present measurements of Collins asymmetries in the inclusive process e[superscript +]e[superscript −] → ππX, where π stands for charged pions, at a center-of-mass energy of 10.6 GeV. We use a data sample of 468 fb[superscript -1] collected by the BABAR experiment …

Antideuteron production in ϒ(nS) decays and in e[superscript +]e[superscript −] → q[bar over q] at √s ≈ 10.58 GeV

J. P. Lees, Vincent Poireau, V. Tisserand, E. Graugés et autres

Cross sections for the reactions e+e−→KS0KL0 , KS0KL0π+π− , KS0KS0π+π− , and KS0KS0K+K− from events with initial-state radiation

J. P. Lees, Vincent Poireau, V. Tisserand, E. Graugés et autres

We study the processes ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{K}_{S}^{0}{K}_{L}^{0}\ensuremath{\gamma}$, ${K}_{S}^{0}{K}_{L}^{0}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}\ensuremath{\gamma}$, ${K}_{S}^{0}{K}_{S}^{0}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}\ensuremath{\gamma}$, and ${K}_{S}^{0}{K}_{S}^{0}{K}^{+}{K}^{\ensuremath{-}}\ensuremath{\gamma}$, where the photon is radiated from the initial state, providing cross section measurements for the hadronic states over a continuum of center-of-mass energies. The results are based on $469\text{ }{\text{fb}}^{\ensuremath{-}1}$ of data collected …

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Measurement of the B → X[subscript s]ℓ[superscript +]ℓ[superscript −] Branching Fraction and Search for Direct CP Violation from a Sum of Exclusive Final States

J. P. Lees, V. Poireau, V. Tisserand, E. Graugés et autres