P. E. Karchin
A5036573526- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Computational Physics and Python Applications
- Radiation Detection and Scintillator Technologies
- Black Holes and Theoretical Physics
- Astrophysics and Cosmic Phenomena
- Superconducting Materials and Applications
- Nuclear reactor physics and engineering
- Atomic and Subatomic Physics Research
- Muon and positron interactions and applications
- Distributed and Parallel Computing Systems
- Gamma-ray bursts and supernovae
- Particle Accelerators and Free-Electron Lasers
- Medical Imaging Techniques and Applications
- Nuclear physics research studies
- Particle accelerators and beam dynamics
- International Science and Diplomacy
- Laser-Plasma Interactions and Diagnostics
- Noncommutative and Quantum Gravity Theories
- CCD and CMOS Imaging Sensors
Wayne State University
2016-2025
A. Alikhanyan National Laboratory
2022-2024
Institute of High Energy Physics
2022-2024
European Organization for Nuclear Research
2012-2024
Wayne State College
2024
University of Antwerp
2024
Vrije Universiteit Brussel
2024
Florida Institute of Technology
2018
National and Kapodistrian University of Athens
2017
University of California, Los Angeles
2017
The decay ${D}^{+}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{e}^{+}{\ensuremath{\nu}}_{e}$ has been studied in the Fermilab photoproduction experiment E691. ratio of branching ratios, $\frac{B({D}^{+}\ensuremath{\rightarrow}{\overline{K}}^{*0}{e}^{+}{\ensuremath{\nu}}_{e})}{B({D}^{+}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{+})}$, is found to be 0.49\ifmmode\pm\else\textpm\fi{}0.04 \ifmmode\pm\else\textpm\fi{}0.05,...
Using the data from Fermilab experiment 691, we have observed signals for decays ${{D}_{s}}^{\ifmmode\pm\else\textpm\fi{}}$ and ${D}^{\ifmmode\pm\else\textpm\fi{}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$ analyzed these modes fraction due to ${\ensuremath{\rho}}^{0}{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$ ${f}_{0}(975){\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$. In addition, searched...
Decays of the ${D}^{0}$ meson to ${K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{0}$ and ${\overline{K}}^{0}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ ${D}^{+}$ ${K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{+}$ have been analyzed for resonant substructure. We present results on amplitudes phases each decay mode compare with other measurements. confirm highly nonresonant nature decays. There is general agreement theoretical models branching...
We report on a Dalitz-plot analysis of 250 ${\mathit{D}}^{\ifmmode\pm\else\textpm\fi{}}$ and 290 ${\mathit{D}}_{\mathit{s}}^{\ifmmode\pm\else\textpm\fi{}}$ decays into ${\mathit{K}}^{+}$${\mathit{K}}^{\mathrm{\ensuremath{-}}}$${\mathrm{\ensuremath{\pi}}}^{\ifmmode\pm\else\textpm\fi{}}$. measure the relative rate for each charmed meson decaying \ensuremath{\varphi}${\mathrm{\ensuremath{\pi}}}^{\ifmmode\pm\else\textpm\fi{}}$,...
We have used a silicon-microstrip vertex detector with Tagged Photon spectrometer to measure the lifetimes of charmed mesons produced by high-energy photon beam at Fermilab. The D+ lifetime, based on 969 D+→K−π+π+ decays, is measured be (1.06±0.05±0.03)×10−12 s. Using 1360 D0 decays into modes K−π+ and K−π+π−π+, we determine lifetime (0.435±0.015±0.010)×10−12 ratio τ(D+)/τ(D0) obtained from these two measurements 2.44±0.14±0.08.Received 14 October...
The CMS GEM collaboration is performing a feasibility study to install triple-GEM detectors in the forward region of muon system (1.6 < |η| 2.4) detector at LHC. Such micro-pattern gas are able cope with extreme particle rates that expected during High Luminosity phase With their spatial resolution order 100 micron GEMs would not only provide additional benefits Level Trigger, but also identification and track reconstruction, effectively combining tracking triggering capabilities one single...
The CMS GEM collaboration is considering Gas Electron Multipliers (GEMs) for upgrading the forward muon system in 1.5 <; |η| 2.4 endcap region. detectors can provide precision tracking and fast trigger information. They would improve momentum resolution missing redundancy high-η Employing a new faster construction assembly technique, we built four full-scale Triple-GEM inner ring of first station. We plan to install these or further improved versions during long LHC shutdown 2013/14...
We have studied the exclusive semileptonic decay mode ${\mathit{D}}^{+}$\ensuremath{\rightarrow}K${\mathrm{\ifmmode\bar\else\textasciimacron\fi{}}}^{0}$${\mathit{e}}^{+}$${\ensuremath{\nu}}_{\mathit{e}}$ in Fermilab photoproduction experiment E691. find ratio of...
We observe 97 decays of the charmed baryon, ${\ensuremath{\Lambda}}_{c}^{+}$, into a ${\mathrm{pK}}^{\mathrm{\ensuremath{-}}}$${\ensuremath{\pi}}^{+}$ final state in Fermilab photoproduction experiment. The mass is measured to be 2286.2\ifmmode\pm\else\textpm\fi{}1.7\ifmmode\pm\else\textpm\fi{}0.7 MeV/${c}^{2}$. positions production and decay vertices are reconstructed with use silicon microstrip vertex detector. From these measurements, we determine lifetime ${\ensuremath{\Lambda}}_{c}$...
We have searched for the decay ${\mathit{D}}_{\mathit{s}}^{+}$\ensuremath{\rightarrow}\ensuremath{\varphi}${\mathit{e}}^{+}$${\ensuremath{\nu}}_{\mathit{e}}$ in data from Fermilab charm photoproduction experiment E691. The resulting upper limit is B(${\mathit{D}}_{\mathit{s}}^{+}$\ensuremath{\rightarrow}\ensuremath{\varphi}${\mathit{e}}^{+}$${\ensuremath{\nu}}_{\mathit{e}}$)0.45B(${\mathit{D}}_{\mathit{s}}^{+}$\ensuremath{\rightarrow}\ensuremath{\varphi}${\mathrm{\ensuremath{\pi}}}^{+}$)....
The muon detector of the HERA-B experiment at DESY (Hamburg, Germany) is a gaseous that provides identification in high-rate environment. Pairs muons with an invariant mass region J//spl psi/, meson ensure first-level trigger for experiment. Three different types gas proportional chambers are employed: tube, pad, and pixel. fully installed has been continuously running since November 1999. A clear signal psi//spl rarr//spl mu//spl mu/, reconstructed from data taken during commissioning run....
GEM detectors are used in high energy physics experiments given their good spatial resolution, rate capability and radiation hardness. An international collaboration is investigating the possibility of covering 1.6 < |η| 2.4 region CMS muon endcaps with large-area triple-GEM detectors. The high-η area actually not fully instrumented, only Cathode Strip Chamber (CSC) installed. vacant presents an opportunity for a detector technology able to cope harsh environment; these micropattern gas...
The CMS GEM collaboration is considering Gas Electron Multipliers (GEMs) for upgrading the forward muon system in 1.5<|eta|<2.4 endcap region. detectors can provide precision tracking and fast trigger information. They would improve momentum resolution missing redundancy high-eta Employing a new faster construction assembly technique, we built four full-scale Triple-GEM inner ring of first station. We plan to install these or further improved versions during long LHC shutdown 2013/14...
The LHC data-taking will resume in 2015 with energy of 13–14 TeV and luminosity 2÷5 × 1034 cm−2 s−1. At those energies, a considerable fraction the particles produced propagate high pseudo-rapidity regions. proposal for upgrade CMS muon forward system involves Gas Electron Multiplier (GEM) chambers to be installed during second Long Shutdown (LS2) covering pseudorapidity range 1.5 < |η| 2.2. This detector is able handle extreme particle rates expected this region when running at higher...
Using data from Fermilab photoproduction experiment E691, we measure the ratio of branching fractions between Cabibbo-suppressed modes B(D0→K−K+)B(D0→π−π+) to be 1.95±0.34±0.22. We also report for D0→K−K+ and D0→π−π+ relative Cabibbo-allowed decay D0→K−π+. Furthermore, place an upper limit 0.45 at 90% C.L. on CP-violating asymmetry in vs D¯0→K−K+ decays.Received 21 May 1991DOI:https://doi.org/10.1103/PhysRevD.44.R3371©1991 American Physical Society
In this contribution we will report on the progress of design readout and data acquisition system being developed for triple-GEM detectors which be installed in forward region (1.5 < |η| 2.2) CMS muon spectrometer during 2nd long shutdown LHC, expected period 2017–2018. The designed to take full advantage current generic developments introduced LHC upgrades. is based use CERN GLIB boards hosted micro-TCA crates off-detector electronics Versatile Link with GBT chipset link front-end boards....
During the next shutdown of LHC at CERN, CMS experiment plans to start installing GEM detectors in endcap (high pseudorapidity) region. These muon have excellent spatial and temporal resolution as well a high chemical stability radiation hardness. A report is given on preliminary results materials studies that aimed fully characterize detector components before after exposure high-radiation environment.