A. Krivshich - EPECUR Collaboration and GW INS Data Analysis Center

A. Krivshich
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A. Krivshich
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EPECUR Collaboration and GW INS Data Analysis Center
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Nuclear Experiment (12)
 
High Energy Physics - Experiment (9)
 
Physics - Instrumentation and Detectors (5)
 
Nuclear Theory (2)
 
High Energy Physics - Phenomenology (1)

Publications Authored By A. Krivshich

The analysis of high-precision $\pi^{\pm}p \to \pi^{\pm}p$ cross section data from the EPECUR Collaboration based on the multichannel $K$-matrix approach is presented.The sharp structures seen in these data are studied in terms of both opening thresholds and new resonance contributions. Some prominent features are found to be due to the opening $K\Sigma$ channel. Read More

Background: The rate \lambda_pp\mu\ characterizes the formation of pp\mu\ molecules in collisions of muonic p\mu\ atoms with hydrogen. In measurements of the basic weak muon capture reaction on the proton to determine the pseudoscalar coupling g_P, capture occurs from both atomic and molecular states. Thus knowledge of \lambda_pp\mu\ is required for a correct interpretation of these experiments. Read More

2015Jan
Authors: SELEX Collaboration, G. A. Nigmatkulov, A. K. Ponosov, U. Akgun, G. Alkhazov, J. Amaro-Reyes, A. Asratyan, A. G. Atamantchouk, A. S. Ayan, M. Y. Balatz, A. Blanco-Covarrubias, N. F. Bondar, P. S. Cooper, L. J. Dauwe, G. V. Davidenko, U. Dersch, A. G. Dolgolenko, G. B. Dzyubenko, R. Edelstein, L. Emediato, A. M. F. Endler, J. Engelfried, I. Eschrich, C. O. Escobar, N. Estrada, A. V. Evdokimov, I. S. Filimonov, A. Flores-Castillo, F. G. Garcia, V. L. Golovtsov, P. Gouffon, E. Gülmez, M. Iori, S. Y. Jun, M. Kaya, J. Kilmer, V. T. Kim, L. M. Kochenda, I. Konorov, A. P. Kozhevnikov, A. G. Krivshich, H. Krüger, M. A. Kubantsev, V. P. Kubarovsky, A. I. Kulyavtsev, N. P. Kuropatrkin, V. F. Kurshetsov, A. Kushnirenko, J. Lach, L. G. Landsberg, I. Larin, E. M. Leikin, G. López-Hinojosa, T. Lungov, V. P. Maleev, D. Mao, P. Mathew, M. Mattson, V. Matveev, E. McCliment, M. A. Moinester, V. V. Molchanov, A. Morelos, A. V. Nemitkin, P. V. Neoustroev, C. Newsom, A. P. Nilov, S. B. Nurushev, A. Ocherashvili, Y. Onel, S. Ozkorucuklu, A. Penzo, S. V. Petrenko, M. Procario, V. A. Prutskoi, B. V. Razmyslovich, D. A. Romanov, V. I. Rud, J. Russ, J. L. Sánchez-López, A. A. Savchenko, J. Simon, G. V. Sinev, A. I. Sitnikov, V. J. Smith, M. Srivastava, V. Steiner, V. Stepanov, L. Stutte, M. Svoiski, V. V. Tarasov, N. K. Terentyev, I. Torres, L. N. Uvarov, A. N. Vasiliev, D. V. Vavilov, E. Vázquez-Jáuregui, V. S. Verebryusov, V. A. Victorov, V. E. Vishnyakov, A. A. Vorobyov, K. Vorwalter, J. You, R. Zukanovich-Funchal

We report on the measurement of the one-dimensional charged kaon correlation functions using 600~GeV/{\it c} $\Sigma^-$, $\pi^-$ and 540~GeV/{\it c} $p$ beams from the SELEX~(E781) experiment at the Fermilab Tevatron. $K^{\pm}K^{\pm}$ correlation functions are studied for three transverse pair momentum, $k_T$, ranges and parameterized by a Gaussian form. The emission source radii, $R$, and the correlation strength, $\lambda$, are extracted. Read More

2014Oct
Affiliations: 1EPECUR Collaboration and GW INS Data Analysis Center, 2EPECUR Collaboration and GW INS Data Analysis Center, 3EPECUR Collaboration and GW INS Data Analysis Center, 4EPECUR Collaboration and GW INS Data Analysis Center, 5EPECUR Collaboration and GW INS Data Analysis Center, 6EPECUR Collaboration and GW INS Data Analysis Center, 7EPECUR Collaboration and GW INS Data Analysis Center, 8EPECUR Collaboration and GW INS Data Analysis Center, 9EPECUR Collaboration and GW INS Data Analysis Center, 10EPECUR Collaboration and GW INS Data Analysis Center, 11EPECUR Collaboration and GW INS Data Analysis Center, 12EPECUR Collaboration and GW INS Data Analysis Center, 13EPECUR Collaboration and GW INS Data Analysis Center, 14EPECUR Collaboration and GW INS Data Analysis Center, 15EPECUR Collaboration and GW INS Data Analysis Center, 16EPECUR Collaboration and GW INS Data Analysis Center, 17EPECUR Collaboration and GW INS Data Analysis Center, 18EPECUR Collaboration and GW INS Data Analysis Center, 19EPECUR Collaboration and GW INS Data Analysis Center, 20EPECUR Collaboration and GW INS Data Analysis Center, 21EPECUR Collaboration and GW INS Data Analysis Center, 22EPECUR Collaboration and GW INS Data Analysis Center, 23EPECUR Collaboration and GW INS Data Analysis Center, 24EPECUR Collaboration and GW INS Data Analysis Center, 25EPECUR Collaboration and GW INS Data Analysis Center

Cross sections for pi+-p elastic scattering have been measured to high precision, for beam momenta between 800 and 1240 MeV/c, by the EPECUR Collaboration, using the ITEP proton synchrotron. The data precision allows comparisons of the existing partial-wave analyses (PWA) on a level not possible previously. These comparisons imply that updated PWA are required. Read More

The MuCap experiment at the Paul Scherrer Institute performed a high-precision measurement of the rate of the basic electroweak process of nuclear muon capture by the proton, $\mu^- + p \rightarrow n + \nu_\mu$. The experimental approach was based on the use of a time projection chamber (TPC) that operated in pure hydrogen gas at a pressure of 10 bar and functioned as an active muon stopping target. The TPC detected the tracks of individual muon arrivals in three dimensions, while the trajectories of outgoing decay (Michel) electrons were measured by two surrounding wire chambers and a plastic scintillation hodoscope. Read More

The OLYMPUS experiment was designed to measure the ratio between the positron-proton and electron-proton elastic scattering cross sections, with the goal of determining the contribution of two-photon exchange to the elastic cross section. Two-photon exchange might resolve the discrepancy between measurements of the proton form factor ratio, $\mu_p G^p_E/G^p_M$, made using polarization techniques and those made in unpolarized experiments. OLYMPUS operated on the DORIS storage ring at DESY, alternating between 2. Read More

2013Nov
Affiliations: 1Institute for Theoretical and Experimental Physics, 2Petersburg Nuclear Physics Institute, 3Institute for Theoretical and Experimental Physics, 4Institute for Theoretical and Experimental Physics, 5Institute for Theoretical and Experimental Physics, 6Petersburg Nuclear Physics Institute, 7Petersburg Nuclear Physics Institute, 8Petersburg Nuclear Physics Institute, 9Institute for Theoretical and Experimental Physics, 10Institute for Theoretical and Experimental Physics, 11Institute for Theoretical and Experimental Physics, 12Petersburg Nuclear Physics Institute, 13Petersburg Nuclear Physics Institute, 14Petersburg Nuclear Physics Institute, 15Petersburg Nuclear Physics Institute, 16Institute for Theoretical and Experimental Physics, 17Institute for Theoretical and Experimental Physics, 18Institute for Theoretical and Experimental Physics, 19Petersburg Nuclear Physics Institute, 20Institute for Theoretical and Experimental Physics, 21Abilene Christian University, 22Institute for Theoretical and Experimental Physics, 23Petersburg Nuclear Physics Institute, 24Institute for Theoretical and Experimental Physics, 25Petersburg Nuclear Physics Institute, 26Petersburg Nuclear Physics Institute

EPECUR experimental setup is aimed at the search of narrow resonant states by precision measurement of differential and total reaction cross sections of pion-nucleon interaction with 1 MeV pion energy steps. In five years passed from the idea of the experiment till the start of the data taking in April of 2009, a new apparatus was build from scratch at the universal beam line 322 of ITEP proton synchrotron U-10. The setup is essentially a non-magnetic spectrometer with a liquid hydrogen target based on the large aperture drift chambers with hexagonal structure. Read More

The MuCap experiment at the Paul Scherrer Institute has measured the rate L_S of muon capture from the singlet state of the muonic hydrogen atom to a precision of 1%. A muon beam was stopped in a time projection chamber filled with 10-bar, ultra-pure hydrogen gas. Cylindrical wire chambers and a segmented scintillator barrel detected electrons from muon decay. Read More

2012Apr
Affiliations: 1Institute for Theoretical and Experimental Physics, Moscow, Russia, 2Petersburg Nuclear Physics Institute, Gatchina, Russia, 3Institute for Theoretical and Experimental Physics, Moscow, Russia, 4Institute for Theoretical and Experimental Physics, Moscow, Russia, 5Petersburg Nuclear Physics Institute, Gatchina, Russia, 6Petersburg Nuclear Physics Institute, Gatchina, Russia, 7Petersburg Nuclear Physics Institute, Gatchina, Russia, 8Institute for Theoretical and Experimental Physics, Moscow, Russia, 9Petersburg Nuclear Physics Institute, Gatchina, Russia, 10Institute for Theoretical and Experimental Physics, Moscow, Russia, 11Petersburg Nuclear Physics Institute, Gatchina, Russia, 12Petersburg Nuclear Physics Institute, Gatchina, Russia, 13Petersburg Nuclear Physics Institute, Gatchina, Russia, 14Petersburg Nuclear Physics Institute, Gatchina, Russia, 15Institute for Theoretical and Experimental Physics, Moscow, Russia, 16Institute for Theoretical and Experimental Physics, Moscow, Russia, 17Petersburg Nuclear Physics Institute, Gatchina, Russia, 18Institute for Theoretical and Experimental Physics, Moscow, Russia, 19Abilene Christian University, Abilene, USA, 20Institute for Theoretical and Experimental Physics, Moscow, Russia, 21Petersburg Nuclear Physics Institute, Gatchina, Russia, 22Institute for Theoretical and Experimental Physics, Moscow, Russia, 23Petersburg Nuclear Physics Institute, Gatchina, Russia, 24Petersburg Nuclear Physics Institute, Gatchina, Russia

Study of the elastic scattering can produce a rich information on the dynamics of the strong interaction. The EPECUR collaboration is aimed at the research of baryon resonances in the second resonance region via pion-proton elastic scattering and kaon-lambda production. The experiment features high statistics and better than 1 MeV resolution in the invariant mass thus allowing searches for narrow resonances with the coupling to the pi p channel as low as 5%. Read More

2009Dec
Affiliations: 1ITEP, Moscow, Russia, 2PNPI, Gatchina, Russia, 3ITEP, Moscow, Russia, 4ITEP, Moscow, Russia, 5ITEP, Moscow, Russia, 6PNPI, Gatchina, Russia, 7PNPI, Gatchina, Russia, 8ITEP, Moscow, Russia, 9ITEP, Moscow, Russia, 10PNPI, Gatchina, Russia, 11PNPI, Gatchina, Russia, 12PNPI, Gatchina, Russia, 13PNPI, Gatchina, Russia, 14ITEP, Moscow, Russia, 15ITEP, Moscow, Russia, 16PNPI, Gatchina, Russia, 17ITEP, Moscow, Russia, 18ACU, Abilene, USA, 19ITEP, Moscow, Russia, 20PNPI, Gatchina, Russia, 21ITEP, Moscow, Russia, 22PNPI, Gatchina, Russia, 23PNPI, Gatchina, Russia

An experiment EPECUR, aimed at the search of the cryptoexotic non-strange member of the pentaquark antidecuplet, started its operation at a pion beam line of the ITEP 10 GeV proton synchrotron. The invariant mass range of the interest (1610-1770) MeV will be scanned for a narrow state in the pion-proton and kaon-lambda systems in the formation-type experiment. The scan in the s-channel is supposed to be done by the variation of the incident pi- momentum and its measurement with the accuracy of up to 0. Read More

The rate of nuclear muon capture by the proton has been measured using a new experimental technique based on a time projection chamber operating in ultra-clean, deuterium-depleted hydrogen gas at 1 MPa pressure. The capture rate was obtained from the difference between the measured $\mu^-$ disappearance rate in hydrogen and the world average for the $\mu^+$ decay rate. The target's low gas density of 1% compared to liquid hydrogen is key to avoiding uncertainties that arise from the formation of muonic molecules. Read More

2007Jan
Affiliations: 1Institute for Theoretical and Experimental Physics, 2Petersburg Nuclear Physics Institute, 3Institute for Theoretical and Experimental Physics, 4Petersburg Nuclear Physics Institute, 5Petersburg Nuclear Physics Institute, 6Institute for Theoretical and Experimental Physics, 7Institute for Theoretical and Experimental Physics, 8Institute for Theoretical and Experimental Physics, 9Petersburg Nuclear Physics Institute, 10Petersburg Nuclear Physics Institute, 11Petersburg Nuclear Physics Institute, 12Petersburg Nuclear Physics Institute, 13Institute for Theoretical and Experimental Physics, 14Institute for Theoretical and Experimental Physics, 15Institute for Theoretical and Experimental Physics, 16Petersburg Nuclear Physics Institute, 17Institute for Theoretical and Experimental Physics, 18Abilene Christian University, 19Institute for Theoretical and Experimental Physics, 20Abilene Christian University, 21Institute for Theoretical and Experimental Physics, 22Petersburg Nuclear Physics Institute, 23Institute for Theoretical and Experimental Physics, 24Petersburg Nuclear Physics Institute, 25Abilene Christian University, 26Abilene Christian University

'EPECUR' experiment setup is under construction at the beam line 322 of the ITEP proton synchrotron. The experiment requires several large area drift chambers to provide reasonable acceptance and fine pitch proportional chambers for beam particle tracking with total number of electronic channels of about 7000. New compact and cost effective readout system for these gaseous detectors was designed, prototyped and tested in the latest two years based on the modern technologies in analog and digital electronics, as well as in data transfer protocols. Read More

2005Sep
Affiliations: 1ITEP, Moscow, Russia, 2ITEP, Moscow, Russia, 3ITEP, Moscow, Russia, 4ITEP, Moscow, Russia, 5ITEP, Moscow, Russia, 6ITEP, Moscow, Russia, 7ITEP, Moscow, Russia, 8ITEP, Moscow, Russia, 9ITEP, Moscow, Russia, 10ITEP, Moscow, Russia, 11ITEP, Moscow, Russia, 12ITEP, Moscow, Russia, 13PNPI, Gatchina, Russia, 14PNPI, Gatchina, Russia, 15PNPI, Gatchina, Russia, 16PNPI, Gatchina, Russia, 17PNPI, Gatchina, Russia, 18PNPI, Gatchina, Russia, 19PNPI, Gatchina, Russia, 20PNPI, Gatchina, Russia

The main goal of this proposal is the search for a narrow cryptoexotic nucleon resonance by scanning of the pi- p system invariant mass in the region (1610-1770) MeV with the detection of pi- p and K Lambda decays. The scan is supposed to be done by the variation of the incident pi- momentum and its measurement with the accuracy of up to +-0.1% (better than 1 MeV in terms of the invariant mass in the whole energy range) with a set of proportional chambers located in the first focus of the magnetooptical channel. Read More

The aim of the MuCap experiment is a 1% measurement of the singlet capture rate Lambda_S for the basic electro-weak reaction mu + p -> n + nu_mu. This observable is sensitive to the weak form-factors of the nucleon, in particular to the induced pseudoscalar coupling constant g_P. It will provide a rigorous test of theoretical predictions based on the Standard Model and effective theories of QCD. Read More