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6 results for au:Akindinov_A in:hep-ex
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SPD Collaboration, V. Abazov, V. Abramov, L. Afanasyev, R. Akhunzyanov, A. Akindinov, I. Alekseev, A. Aleshko, V. Alexakhin, G. Alexeev, L. Alimov, A. Allakhverdieva, A. Amoroso, V. Andreev, V. Andreev, E. Andronov, Yu. Anikin, S. Anischenko, A. Anisenkov, V. Anosov, et al (397) The Spin Physics Detector collaboration proposes to install a universal detector in the second interaction point of the NICA collider under construction (JINR, Dubna) to study the spin structure of the proton and deuteron and other spin-related phenomena using a unique possibility to operate with polarized proton and deuteron beams at a collision energy up to 27 GeV and a luminosity up to $10^{32}$ cm$^{-2}$ s$^{-1}$. As the main goal, the experiment aims to provide access to the gluon TMD PDFs in the proton and deuteron, as well as the gluon transversity distribution and tensor PDFs in the deuteron, via the measurement of specific single and double spin asymmetries using different complementary probes such as charmonia, open charm, and prompt photon production processes. Other polarized and unpolarized physics is possible, especially at the first stage of NICA operation with reduced luminosity and collision energy of the proton and ion beams. This document is dedicated exclusively to technical issues of the SPD setup construction.
V.M. Abazov, V. Abramov, L.G. Afanasyev, R.R. Akhunzyanov, A.V. Akindinov, N. Akopov, I. G. Alekseev, A.M. Aleshko, V.Yu. Alexakhin, G.D. Alexeev, M. Alexeev, A. Amoroso, I.V. Anikin, V.F. Andreev, V.A. Anosov, A.B. Arbuzov, N.I. Azorskiy, A.A. Baldin, V.V. Balandina, E.G. Baldina, et al (275) The Spin Physics Detector, a universal facility for studying the nucleon spin structure and other spin-related phenomena with polarized proton and deuteron beams, is proposed to be placed in one of the two interaction points of the NICA collider that is under construction at the Joint Institute for Nuclear Research (Dubna, Russia). At the heart of the project there is huge experience with polarized beams at JINR. The main objective of the proposed experiment is the comprehensive study of the unpolarized and polarized gluon content of the nucleon. Spin measurements at the Spin Physics Detector at the NICA collider have bright perspectives to make a unique contribution and challenge our understanding of the spin structure of the nucleon. In this document the Conceptual Design of the Spin Physics Detector is presented.
A. V. Akindinov, E. G. Anassontzis, G. Anton, M. Ardid, J. Aublin, B. Baret, V. Bertin, S. Bourret, C. Bozza, M. Bruchner, R. Bruijn, J. Brunner, M. Chabab, N. Chau, A. S. Chepurnov, M. Colomer Molla, P. Coyle, A. Creusot, G. de Wasseige, A. Domi, et al (71) The Protvino accelerator facility located in the Moscow region, Russia, is in a good position to offer a rich experimental research program in the field of neutrino physics. Of particular interest is the possibility to direct a neutrino beam from Protvino towards the KM3NeT/ORCA detector, which is currently under construction in the Mediterranean Sea 40 km offshore Toulon, France. This proposal is known as P2O. Thanks to its baseline of 2595 km, this experiment would yield an unparalleled sensitivity to matter effects in the Earth, allowing for the determination of the neutrino mass ordering with a high level of certainty after only a few years of running at a modest beam intensity of $\approx$ 90 kW. With a prolonged exposure ($\approx$ 1500 kW*yr), a 2$\sigma$ sensitivity to the leptonic CP-violating Dirac phase can be achieved. A second stage of the experiment, comprising a further intensity upgrade of the accelerator complex and a densified version of the ORCA detector (Super-ORCA), would allow for up to a 6$\sigma$ sensitivity to CP violation and a 10$^\circ$-17$^\circ$ resolution on the CP phase after 10 years of running with a 450 kW beam, competitive with other planned experiments. The initial composition and energy spectrum of the neutrino beam would need to be monitored by a near detector, to be constructed several hundred meters downstream from the proton beam target. The same neutrino beam and near detector set-up would also allow for neutrino-nucleus cross section measurements to be performed. A short-baseline sterile neutrino search experiment would also be possible.
D.Yu. Akimov, A.V. Akindinov, I.S. Alexandrov, V.A. Belov, A.I. Bolozdynya, A.A. Burenkov, A.F. Buzulutskov, M.V. Danilov, Yu. V. Efremenko, M.A. Kirsanov, A.G. Kovalenko, V.N. Stekhanov A successful operation of a new optical readout system (THGEM + WLS + MGPDs (multichannel array of multipixel avalanche Geiger photodiodes) in a two-phase liquid xenon detector was demonstrated.
Inclusive cross sections $\sigma^A=Ed^3{\sigma(X,P_t^2)/d^3p}$ of antiproton and negative pion production on Be, Al, Cu and Ta targets hit by 10 GeV protons were measured at the laboratory angles of 10.5$^{\circ}$ and 59$^{\circ}$. Antiproton cross sections were obtained in both kinematically allowed and kinematically forbidden regions for antiproton production on a free nucleon. The antiproton cross section ratio as a function of the longitudinal variable $X$ exhibits three separate plateaus which gives evidence for the existence of compact baryon configurations in nuclei-small-distance scaled objects of nuclear structure. Comparability of the measured cross section ratios with those obtained in the inclusive electron scattering off nuclei suggests a weak antiproton absorption in nuclei. Observed behavior of the cross section ratios is interpreted in the framework of a model considering the hadron production as a fragmentation of quarks (antiquarks) into hadrons. It has been established that the antiproton formation length in nuclear matter can reach the magnitude of 4.5 fm.
ALICE Collaboration, B. Abelev, J. Adam, D. Adamova, A.M. Adare, M.M. Aggarwal, G. Aglieri Rinella, A.G. Agocs, A. Agostinelli, S. Aguilar Salazar, Z. Ahammed, A. Ahmad Masoodi, N. Ahmad, S.U. Ahn, A. Akindinov, D. Aleksandrov, B. Alessandro, R. Alfaro Molina, A. Alici, A. Alkin, et al (953) Mar 19 2012
hep-ex arXiv:1203.3641v2
The ALICE Collaboration has measured inclusive J/psi production in pp collisions at a center of mass energy sqrt(s)=2.76 TeV at the LHC. The results presented in this Letter refer to the rapidity ranges |y|<0.9 and 2.5<y<4 and have been obtained by measuring the electron and muon pair decay channels, respectively. The integrated luminosities for the two channels are L^e_int=1.1 nb^-1 and L^mu_int=19.9 nb^-1, and the corresponding signal statistics are N_J/psi^e+e-=59 +/- 14 and N_J/psi^mu+mu-=1364 +/- 53. We present dsigma_J/psi/dy for the two rapidity regions under study and, for the forward-y range, d^2sigma_J/psi/dydp_t in the transverse momentum domain 0<p_t<8 GeV/c. The results are compared with previously published results at sqrt(s)=7 TeV and with theoretical calculations.