P. Pakhlov
A5046508774- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Neutrino Physics Research
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Particle Accelerators and Free-Electron Lasers
- Computational Physics and Python Applications
- Medical Imaging Techniques and Applications
- Atomic and Subatomic Physics Research
- Black Holes and Theoretical Physics
- Superconducting Materials and Applications
- Nuclear physics research studies
- Distributed and Parallel Computing Systems
- Particle accelerators and beam dynamics
- Advanced NMR Techniques and Applications
- Radioactive Decay and Measurement Techniques
- Radiation Detection and Scintillator Technologies
- Astrophysics and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Atomic and Molecular Physics
- Gamma-ray bursts and supernovae
- Advanced MRI Techniques and Applications
- Radiopharmaceutical Chemistry and Applications
- Scientific Computing and Data Management
National Research University Higher School of Economics
2022-2023
Institute of Engineering Physics
2014-2023
P.N. Lebedev Physical Institute of the Russian Academy of Sciences
2016-2023
Moscow Engineering Physics Institute
2014-2023
University of Bonn
2013-2022
Duke University
2019-2022
Campbell Collaboration
2012-2022
Chonnam National University
2018-2022
University of the Basque Country
2013-2022
University of Cincinnati
2001-2020
We report the observation of two narrow structures in mass spectra pi+-Y(nS) (n=1,2,3) and pi+-hb(mP)(m$ (m=1,2) pairs that are produced association with a single charged pion Y(5S) decays. The measured masses widths averaged over five final states M_1=(10607.2+-2.0) MeV/c2, Gamma_1=(18.4+-2.4) MeV M_2=(10652.2+-1.5) Gamma_2=(11.5+-2.2) MeV. results obtained 121.4 1/fb data sample collected Belle detector vicinity resonance at KEKB asymmetric-energy e+e- collider.
A distinct peak is observed in the ${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\psi}}^{\ensuremath{'}}$ invariant mass distribution near 4.43 GeV $B\ensuremath{\rightarrow}K{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\psi}}^{\ensuremath{'}}$ decays. fit using a Breit-Wigner resonance shape yields and width of $M=4433\ifmmode\pm\else\textpm\fi{}4(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}2(\mathrm{syst})\text{ }\text{ }\mathrm{MeV}$...
The Belle detector at the KEKB electron-positron collider has collected almost 1 billion Y(4S) events in its decade of operation. Super-KEKB, an upgrade is under construction, to increase luminosity by two orders magnitude during a three-year shutdown, with ultimate goal 8E35 /cm^2 /s luminosity. To exploit increased luminosity, been proposed. A new international collaboration Belle-II, being formed. Technical Design Report presents physics motivation, basic methods accelerator upgrade, as...
This work is on the Physics of B Factories. Part A this book contains a brief description SLAC and KEK Factories as well their detectors, BaBar Belle, data taking related issues. discusses tools methods used by experiments in order to obtain results. The results themselves can be found C. Please note that version 3 archive auxiliary book. uses notation alpha, beta, gamma for angles Unitarity Triangle. nominal phi_1, phi_2 phi_3. cite Eur. Phys. J. C74 (2014) 3026.
The cross section for ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}\ensuremath{\psi}(2S)$ between threshold and $\sqrt{s}=5.5\text{ }\text{ }\mathrm{GeV}$ is measured using $673\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of data on off the $\ensuremath{\Upsilon}(4S)$ resonance collected with Belle detector at KEKB. Two resonant structures are observed in...
The cross section for ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}J/\ensuremath{\psi}$ between 3.8 and $5.5\text{ }\text{ }\mathrm{GeV}/{c}^{2}$ is measured using a $548\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ data sample collected on or near the $\ensuremath{\Upsilon}(4S)$ resonance with Belle detector at KEKB. A peak $4.25\text{ }\mathrm{GeV}/{c}^{2}$, corresponding to so called $Y(4260)$, observed. In addition, there another...
We report a measurement of the exclusive e+ e- -->Lambda+_(c)Lambda-_(c) cross section as function center-of-mass energy near Lambda+_(c)Lambda-_(c) threshold. A clear peak with significance 8.2sigma is observed in invariant mass distribution just above With an assumption resonance origin for peak, and width M=[4634 (+8)_(-7)(stat)(+5)_(-8)(syst)] MeV/c(2) Gamma_(tot)=[92 (+40)_(-24)(stat)(+10)_(-21)(syst)] MeV are determined. The analysis based on study events initial-state-radiation...
We report the first observation of a charmoniumlike state recoiling from J/psi in inclusive process e+e- -->J/psi+anything at mass (3.943+/-0.006+/-0.006) GeV/c{2}. also observe decay this into D*D[over ] and determine its intrinsic width to be less than 52 MeV/c{2} 90% C.L. These results are obtained 357 fb{-1} data sample collected with Belle detector near Upsilon(4S) resonance, KEKB asymmetric-energy collider.
We report the first observation of two resonance-like structures in pi+ chi_c1 invariant mass distribution near 4.1 GeV/c^2 exclusive B0-bar --> K- decays. From a Dalitz plot analysis which are represented by Breit-Wigner resonance amplitudes, we determine masses and widths of: M_1 = (4051 +-14 +20-41) MeV/c^2, Gamma_1 (82 +21-17 +47-22) MeV, M_2 (4248 +44-29 +180-35}) Gamma_2 =(177 +54-39 +316-61) MeV; product branching fractions BF(B0-bar Z+_1,2) x BF(Z+_1,2 chi_c1) (3.0 +1.5-0.8 +3.7-1.6)...
We report on a search for new resonant states in the process γγ→D¯¯¯D. A candidate C-even charmonium state is observed vicinity of 3.93 GeV/c2. The production rate and angular distribution γγ center-of-mass frame suggest that this previously unobserved χ′c2, 23P2 state.Received 15 December 2005DOI:https://doi.org/10.1103/PhysRevLett.96.082003©2006 American Physical Society
The Collins effect connects transverse quark spin with a measurable azimuthal dependence in the yield of hadronic fragments around quark's momentum vector. Using two different reconstruction methods, we find evidence statistically significant asymmetries for charged pion pairs e(+)e(-) annihilation at center-of-mass energy 10.52 GeV, which can be attributed to polarization primordial quarks. measurement was performed using sample 79 x 10(6) events collected Belle detector.
We report a high-statistics measurement of the branching fraction for tau^- --> pi^- pi^0 nu_tau and invariant mass spectrum produced system using 72.2 fb^-1 data recorded with Belle detector at KEKB asymmetric-energy e^+ e^- collider. The obtained is (25.24 +/- 0.01 0.39)%, where first error statistical second systematic. unfolded used to determine resonance parameters rho(770), rho'(1450), rho"(1700) mesons. also use this estimate hadronic (2pi) contribution anomalous magnetic moment muon...
We report the first observation of a near-threshold enhancement in D(0)D[over](0)pi(0) system from B-->D(0)D[over](0)pi(0)Kappa decays using 414 fb(-1) data sample collected at Upsilon(4S) resonance. The peaks mass M=3875.2+/-0.7(+0.3)/(-1.6) +/-0.8 MeV/c2 and branching fraction for events peak is B(B-->D(0)D[over](0)pi(0)Kappa)=(1.22+/-0.31(+0.23)/(-0.30))x10(-4). were with Belle detector KEKB energy-asymmetric e+ e- collider.
We report the first observation of e+e−→Υ(1S)π+π−, Υ(2S)π+π−, and evidence for e+e−→Υ(3S)π+π−, Υ(1S)K+K−, near peak Υ(5S) resonance at s∼10.87 GeV. The results are based on a data sample 21.7 fb−1 collected with Belle detector KEKB e+e− collider. Attributing signals to resonance, partial widths Γ(Υ(5S)→Υ(1S)π+π−)=0.59±0.04(stat)±0.09(syst) MeV Γ(Υ(5S)→Υ(2S)π+π−)=0.85±0.07(stat)±0.16(syst) obtained from observed cross sections. These values exceed by more than 2 orders magnitude previously...
We present the results of an amplitude analysis anti-B0 -> J/psi K- pi+ decays. A new charged charmoniumlike state Zc(4200)+ decaying to is observed with a significance 6.2 sigma. The mass and width are 4196 +31-29 +17-13 MeV/c^2 370 +70-70 +70-132 MeV, respectively; preferred assignment quantum numbers J^P = 1^+. In addition, we find evidence for Zc(4430)+ pi+. based on 711 fb^-1 data sample collected by Belle detector at asymmetric-energy e+ e- collider KEKB.
We report a study of the processes ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}J/\ensuremath{\psi}{D}^{(*)}{\overline{D}}^{(*)}$. In $J/\ensuremath{\psi}{D}^{*}{\overline{D}}^{*}$ we observe significant enhancement in ${D}^{*}{\overline{D}}^{*}$ invariant mass spectrum, which interpret as new charmoniumlike state and denote $X(4160)$. The $X(4160)$ parameters are $M=({4156}_{\ensuremath{-}20}^{+25}\ifmmode\pm\else\textpm\fi{}15)\text{ }\text{ }\mathrm{MeV}/{c}^{2}$...
The Collins effect connects transverse quark spin with a measurable azimuthal asymmetry in the yield of hadronic fragments around quark's momentum vector. Using two different reconstruction methods we measure statistically significant asymmetries for charged pion pairs ${e}^{+}{e}^{\ensuremath{-}}$ annihilation at center-of-mass energies 10.52 GeV and 10.58 GeV, which can be attributed to fragmentation primordial quarks components. measurement was performed using data set $547\text{ }\text{...
We report the observation of a new $D_{sJ}$ meson produced in $B^{+} \to \bar{D}^{0} D_{sJ} D^{0} K^{+}$. This state has mass $M=2708 \pm 9 ^{+11}_{-10} \rm{MeV}/{\it c}^{2}$, width $\Gamma = 108 23 ^{+36}_{-31} ~\rm{MeV}/ {\it c}^{2}$ and $1^{-}$ spin-parity. The results are based on an analysis 449 million $B\bar{B}$ events collected at $\Upsilon(4S)$ resonance with Belle detector KEKB asymmetric-energy $e^{+} e^{-}$ collider.
We report the results of a search for charmonium-like state produced in process gamma --> omega J/psi 3.9-4.2 GeV/c^2 mass region. observe significant enhancement, which is well-described by resonant shape with M = (3915 +/- 3 2) MeV/c^2 and total width Gamma (17 10 3) MeV. This enhancement may be related to one or more three states so far reported 3.90-3.95