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7 results on '"P.E. REIMER"'

1. Measurement of J/ψ and ψ(2S) production in p + p and p + d interactions at 120 GeV

Author

C.H. Leung, K. Nagai, K. Nakano, D. Nawarathne, J. Dove, S. Prasad, N. Wuerfel, C.A. Aidala, J. Arrington, C. Ayuso, C.L. Barker, C.N. Brown, W.C. Chang, A. Chen, D.C. Christian, B.P. Dannowitz, M. Daugherity, L. El Fassi, D.F. Geesaman, R. Gilman, Y. Goto, R. Guo, T.J. Hague, R.J. Holt, M.F. Hossain, D. Isenhower, E. Kinney, A. Klein, D.W. Kleinjan, Y. Kudo, P.-J. Lin, K. Liu, M.X. Liu, W. Lorenzon, R.E. McClellan, P.L. McGaughey, M.M. Medeiros, Y. Miyachi, S. Miyasaka, D.H. Morton, K. Nakahara, S. Nara, S.F. Pate, J.C. Peng, A. Pun, B.J. Ramson, P.E. Reimer, J.G. Rubin, F. Sanftl, S. Sawada, T. Sawada, M.B.C. Scott, T.-A. Shibata, A.S. Tadepalli, M. Teo, R.S. Towell, S. Uemura, S.G. Wang, A.B. Wickes, J. Wu, and Z.H. Ye

Subjects
Physics, QC1-999
Abstract

We report the p+p and p+d differential cross sections measured in the SeaQuest experiment for J/ψ and ψ(2S) production at Image 1 beam energy covering the forward x-Feynman (xF) range of 0.5

Published
2024
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2. Comparing proton momentum distributions in A = 2 and 3 nuclei via 2H 3H and 3He (e,e′p) measurements

Author

R. Cruz-Torres, S. Li, F. Hauenstein, A. Schmidt, D. Nguyen, D. Abrams, H. Albataineh, S. Alsalmi, D. Androic, K. Aniol, W. Armstrong, J. Arrington, H. Atac, T. Averett, C. Ayerbe Gayoso, X. Bai, J. Bane, S. Barcus, A. Beck, V. Bellini, H. Bhatt, D. Bhetuwal, D. Biswas, D. Blyth, W. Boeglin, D. Bulumulla, A. Camsonne, J. Castellanos, J.-P. Chen, E.O. Cohen, S. Covrig, K. Craycraft, B. Dongwi, M. Duer, B. Duran, D. Dutta, E. Fuchey, C. Gal, T.N. Gautam, S. Gilad, K. Gnanvo, T. Gogami, J. Gomez, C. Gu, A. Habarakada, T. Hague, O. Hansen, M. Hattawy, O. Hen, D.W. Higinbotham, E. Hughes, C. Hyde, H. Ibrahim, S. Jian, S. Joosten, A. Karki, B. Karki, A.T. Katramatou, C. Keppel, M. Khachatryan, V. Khachatryan, A. Khanal, D. King, P. King, I. Korover, T. Kutz, N. Lashley-Colthirst, G. Laskaris, W. Li, H. Liu, N. Liyanage, D. Lonardoni, R. Machleidt, L.E. Marcucci, P. Markowitz, R.E. McClellan, D. Meekins, S. Mey-Tal Beck, Z.-E. Meziani, R. Michaels, M. Mihovilovič, V. Nelyubin, N. Nuruzzaman, M. Nycz, R. Obrecht, M. Olson, L. Ou, V. Owen, B. Pandey, V. Pandey, A. Papadopoulou, S. Park, M. Patsyuk, S. Paul, G.G. Petratos, E. Piasetzky, R. Pomatsalyuk, S. Premathilake, A.J.R. Puckett, V. Punjabi, R. Ransome, M.N.H. Rashad, P.E. Reimer, S. Riordan, J. Roche, F. Sammarruca, N. Santiesteban, B. Sawatzky, E.P. Segarra, B. Schmookler, A. Shahinyan, S. Širca, N. Sparveris, T. Su, R. Suleiman, H. Szumila-Vance, A.S. Tadepalli, L. Tang, W. Tireman, F. Tortorici, G. Urciuoli, M. Viviani, L.B. Weinstein, B. Wojtsekhowski, S. Wood, Z.H. Ye, Z.Y. Ye, and J. Zhang

Subjects
Physics, QC1-999
Abstract

We report the first measurement of the (e,e′p) reaction cross-section ratios for Helium-3 (He3), Tritium (H3), and Deuterium (d). The measurement covered a missing momentum range of 40≤pmiss≤550MeV/c, at large momentum transfer (〈Q2〉≈1.9 (GeV/c)2) and xB>1, which minimized contributions from non quasi-elastic (QE) reaction mechanisms. The data is compared with plane-wave impulse approximation (PWIA) calculations using realistic spectral functions and momentum distributions. The measured and PWIA-calculated cross-section ratios for He3/d and H3/d extend to just above the typical nucleon Fermi-momentum (kF≈250 MeV/c) and differ from each other by ∼20%, while for He3/H3 they agree within the measurement accuracy of about 3%. At momenta above kF, the measured He3/H3 ratios differ from the calculation by 20%−50%. Final state interaction (FSI) calculations using the generalized Eikonal Approximation indicate that FSI should change the He3/H3 cross-section ratio for this measurement by less than 5%. If these calculations are correct, then the differences at large missing momenta between the He3/H3 experimental and calculated ratios could be due to the underlying NN interaction, and thus could provide new constraints on the previously loosely-constrained short-distance parts of the NN interaction.

Published
2019
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3. Electroexcitation of the Δ+(1232) at low momentum transfer

Author

A. Blomberg, D. Anez, N. Sparveris, A.J. Sarty, M. Paolone, S. Gilad, D. Higinbotham, Z. Ahmed, H. Albataineh, K. Allada, B. Anderson, K. Aniol, J. Annand, J. Arrington, T. Averett, H. Baghdasaryan, X. Bai, A. Beck, S. Beck, V. Bellini, F. Benmokhtar, W. Boeglin, C.M. Camacho, A. Camsonne, C. Chen, J.P. Chen, K. Chirapatpimol, E. Cisbani, M. Dalton, W. Deconinck, M. Defurne, R. De Leo, D. Flay, N. Fomin, M. Friend, S. Frullani, E. Fuchey, F. Garibaldi, R. Gilman, C. Gu, D. Hamilton, C. Hanretty, O. Hansen, M. Hashemi Shabestari, O. Hen, T. Holmstrom, M. Huang, S. Iqbal, N. Kalantarians, H. Kang, A. Kelleher, M. Khandaker, I. Korover, J. Leckey, J. LeRose, R. Lindgren, E. Long, J. Mammei, D.J. Margaziotis, A. Martí Jimenez-Arguello, D. Meekins, Z.E. Meziani, M. Mihovilovic, N. Muangma, B. Norum, Nuruzzaman, K. Pan, S. Phillips, E. Piasetzky, A. Polychronopoulou, I. Pomerantz, M. Posik, V. Punjabi, X. Qian, A. Rakhman, P.E. Reimer, S. Riordan, G. Ron, A. Saha, E. Schulte, L. Selvy, R. Shneor, S. Sirca, J. Sjoegren, R. Subedi, V. Sulkosky, W. Tireman, D. Wang, J. Watson, B. Wojtsekhowski, W. Yan, I. Yaron, Z. Ye, X. Zhan, J. Zhang, Y. Zhang, B. Zhao, Z. Zhao, X. Zheng, and P. Zhu

Subjects
CMR, Pion electroproduction, Nucleon deformation, Physics, QC1-999
Abstract

We report on new p(e,e′p)π∘ measurements at the Δ+(1232) resonance at the low momentum transfer region, where the mesonic cloud dynamics is predicted to be dominant and rapidly changing, offering a test bed for chiral effective field theory calculations. The new data explore the Q2 dependence of the resonant quadrupole amplitudes and for the first time indicate that the Electric and the Coulomb quadrupole amplitudes converge as Q2→0. The measurements of the Coulomb quadrupole amplitude have been extended to the lowest momentum transfer ever reached, and suggest that more than half of its magnitude is attributed to the mesonic cloud in this region. The new data disagree with predictions of constituent quark models and are in reasonable agreement with dynamical calculations that include pion cloud effects, chiral effective field theory and lattice calculations. The measurements indicate that improvement is required to the theoretical calculations and provide valuable input that will allow their refinements.

Published
2016
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4. Study of Λn FSI with Λ quasi-free productions on the 3H(e, e′K+)X reaction at JLab

Author

K. Itabashi, K.N. Suzuki, B. Pandey, K. Okuyama, T. Gogami, S. Nagao, S.N. Nakamura, L. Tang, D. Abrams, T. Akiyama, D. Androic, K. Aniol, C. Ayerbe Gayoso, J. Bane, S. Barcus, J. Barrow, V. Bellini, H. Bhatt, D. Bhetuwal, D. Biswas, A. Camsonne, J. Castellanos, J-P. Chen, J. Chen, S. Covrig, D. Chrisman, R. Cruz-Torres, R. Das, E. Fuchey, K. Gnanvo, F. Garibaldi, T. Gautam, J. Gomez, P. Gueye, T.J. Hague, O. Hansen, W. Henry, F. Hauenstein, D.W. Higinbotham, C.E. Hyde, M. Kaneta, C. Keppel, T. Kutz, N. Lashley-Colthirst, S. Li, H. Liu, J. Mammei, P. Markowitz, R. E. McClellan, F. Meddi, D. Meekins, R. Michaels, M. Mihovilovic, A. Moyer, D. Nguyen, M. Nycz, V. Owen, C. Palatchi, S. Park, T. Petkovic, S. Premathilake, P.E. Reimer, J. Reinhold, S. Riordan, V. Rodriguez, C. Samanta, S.N. Santiesteban, B. Sawatzky, S. Širca, K. Slifer, T. Su, Y. Tian, Y. Toyama, K. Uehara, G.M. Urciuoli, D. Votaw, J. Williamson, B. Wojtsekhowski, S.A. Wood, B. Yale, Z. Ye, J. Zhang, and X. Zheng

Abstract

An nnΛ is a neutral baryon system with no charge. The study of the pure Λ-neutron system such as nnΛ gives us information on the Λn interaction. The nnΛ search experiment (E12-17-003) was performed at JLab Hall A in 2018. In this article, the Λn FSI was investigated by a shape analysis of the 3H(e, e′K+)X missing mass spectrum, and a preliminary result for the Λn FSI study is given.

Published
2022

5. Hard exclusive electroproduction of π+π− pairs

Author

A. Airapetian, N. Akopov, Z. Akopov, M. Amarian, V.V. Ammosov, A. Andrus, E.C. Aschenauer, W. Augustyniak, R. Avakian, A. Avetissian, E. Avetissian, P. Bailey, D. Balin, V. Baturin, M. Beckmann, S. Belostotski, S. Bernreuther, N. Bianchi, H.P. Blok, H. Böttcher, A. Borissov, A. Borysenko, M. Bouwhuis, J. Brack, A. Brüll, V. Bryzgalov, G.P. Capitani, T. Chen, G. Ciullo, M. Contalbrigo, P.F. Dalpiaz, R. De Leo, M. Demey, L. De Nardo, E. De Sanctis, E. Devitsin, P. Di Nezza, M. Düren, M. Ehrenfried, A. Elalaoui-Moulay, G. Elbakian, F. Ellinghaus, U. Elschenbroich, R. Fabbri, A. Fantoni, A. Fechtchenko, L. Felawka, S. Frullani, G. Gapienko, V. Gapienko, F. Garibaldi, K. Garrow, E. Garutti, G. Gavrilov, V. Gharibyan, G. Graw, O. Grebeniouk, L.G. Greeniaus, I.M. Gregor, K.A. Griffioen, K. Hafidi, M. Hartig, D. Hasch, D. Heesbeen, M. Henoch, R. Hertenberger, W.H.A. Hesselink, A. Hillenbrand, M. Hoek, Y. Holler, B. Hommez, G. Iarygin, A. Ivanilov, A. Izotov, H.E. Jackson, A. Jgoun, R. Kaiser, E. Kinney, A. Kisselev, M. Kopytin, V. Korotkov, V. Kozlov, B. Krauss, V.G. Krivokhijine, L. Lagamba, L. Lapikás, A. Laziev, P. Lenisa, P. Liebing, L.A. Linden-Levy, K. Lipka, W. Lorenzon, H. Lu, J. Lu, S. Lu, B.-Q. Ma, B. Maiheu, N.C.R. Makins, Y. Mao, B. Marianski, H. Marukyan, F. Masoli, V. Mexner, N. Meyners, O. Mikloukho, C.A. Miller, Y. Miyachi, V. Muccifora, A. Nagaitsev, E. Nappi, Y. Naryshkin, A. Nass, M. Negodaev, W.-D. Nowak, K. Oganessyan, H. Ohsuga, A. Osborne, N. Pickert, S. Potashov, D.H. Potterveld, M. Raithel, D. Reggiani, P.E. Reimer, A. Reischl, A.R. Reolon, C. Riedl, K. Rith, G. Rosner, A. Rostomyan, L. Rubacek, J. Rubin, D. Ryckbosch, Y. Salomatin, I. Sanjiev, I. Savin, A. Schäfer, C. Schill, G. Schnell, K.P. Schüler, J. Seele, R. Seidl, B. Seitz, R. Shanidze, C. Shearer, T.-A. Shibata, V. Shutov, K. Sinram, W. Sommer, M. Stancari, M. Statera, E. Steffens, J.J.M. Steijger, H. Stenzel, J. Stewart, F. Stinzing, P. Tait, H. Tanaka, S. Taroian, B. Tchuiko, A. Terkulov, A. Tkabladze, A. Trzcinski, M. Tytgat, A. Vandenbroucke, P. van der Nat, G. van der Steenhoven, Y. van Haarlem, M.C. Vetterli, V. Vikhrov, M.G. Vincter, C. Vogel, M. Vogt, J. Volmer, C. Weiskopf, J. Wendland, J. Wilbert, G. Ybeles Smit, Y. Ye, Z. Ye, S. Yen, B. Zihlmann, and P. Zupranski

Subjects
Physics, HERMES experiment, Nuclear and High Energy Physics, Particle physics, Meson, Isovector, 010308 nuclear & particles physics, Isoscalar, Nuclear Theory, Parton, 01 natural sciences, Helicity, Nuclear physics, Pion, 0103 physical sciences, High Energy Physics::Experiment, Invariant mass, Nuclear Experiment, 010306 general physics
Abstract

Hard exclusive electroproduction of π + π − pairs off hydrogen and deuterium targets has been studied by the HERMES experiment at DESY. Legendre moments 〈 P 1 〉 and 〈 P 3 〉 of the angular distributions of π + mesons in the center-of-mass frame of the pair have been measured for the first time. Their dependence on the π + π − invariant mass can be understood as being due to the interference between relative P -wave (isovector) and S -, D -wave (isoscalar) states of the two pions. The increase in magnitude of 〈 P 1 〉 as Bjorken x increases is interpreted in the framework of generalized parton distributions as an enhancement of flavour non-singlet q q ¯ exchange for larger values of x , which leads to a sizable admixture of isoscalar and isovector pion pairs. In addition, the interference between P -wave and D -wave states separately for transverse and longitudinal pion pairs has been studied. The data indicate that in the f 2 ( 1270 ) region at 〈 Q 2 〉 = 3 GeV 2 higher-twist effects can be as large as the leading-twist longitudinal component.

Published
2004

6. Measurement of Azimuthal Asymmetries With Respect To Both Beam Charge and Transverse Target Polarization in Exclusive Electroproduction of Real Photons

Author

HERMES collaboration, A Airapetian, N Akopov, Z Akopov, A Andrus, E.C Aschenauer, W Augustyniak, R Avakian, A Avetissian, E Avetisyan, L Barion, S Belostotski, N Bianchi, H.P Blok, H Böttcher, C Bonomo, A Borissov, A Brüll, V Bryzgalov, J Burns, M Capiluppi, G.P Capitani, E Cisbani, G Ciullo, M Contalbrigo, P.F Dalpiaz, W Deconinck, R. De Leo, M Demey, L. De Nardo, E. De Sanctis, M Diefenthaler, P. Di Nezza, J Dreschler, M Düren, M Ehrenfried, G Elbakian, F Ellinghaus, U Elschenbroich, R Fabbri, A Fantoni, L Felawka, S Frullani, A Funel, D Gabbert, G Gapienko, V Gapienko, F Garibaldi, G Gavrilov, V Gharibyan, F Giordano, S Gliske, H Guler, C Hadjidakis, D Hasch, T Hasegawa, G Hill, A Hillenbrand, M Hoek, Y Holler, I Hristova, G Iarygin, Y Imazu, A Ivanilov, A Izotov, H.E Jackson, A Jgoun, S Joosten, R Kaiser, T Keri, E Kinney, A Kisselev, M Kopytin, V Korotkov, V Kozlov, P Kravchenko, V.G Krivokhijine, L Lagamba, R Lamb, L Lapikás, I Lehmann, P Lenisa, L.A Linden-Levy, W Lorenzon, S Lu, X Lu, B.-Q Ma, D Mahon, B Maiheu, N.C.R Makins, Y Mao, B Marianski, H Marukyan, C.A Miller, Y Miyachi, V Muccifora, M Murray, A Mussgiller, A Nagaitsev, E Nappi, Y Naryshkin, A Nass, M Negodaev, W.-D Nowak, A Osborne, L.L Pappalardo, R Perez-Benito, N Pickert, M Raithel, P.E Reimer, A Reischl, A.R Reolon, C Riedl, K Rith, S.E Rock, G Rosner, A Rostomyan, L Rubacek, J Rubin, A.L Ruiz, D Ryckbosch, Y Salomatin, I Sanjiev, A Schäfer, G Schnell, K.P Schüler, B Seitz, C Shearer, T.-A Shibata, V Shutov, M Stancari, M Statera, E Steffens, J.J.M Steijger, H Stenzel, J Stewart, F Stinzing, P Tait, S Taroian, A Terkulov, A Trzcinski, M Tytgat, A Vandenbroucke, P.B. van der Nat, G. van der Steenhoven, Y. Van Haarlem, C. Van Hulse, M Varanda, D Veretennikov, V Vikhrov, I Vilardi, C Vogel, S Wang, S Yaschenko, H Ye, Z Ye, S Yen, W Yu, D Zeiler, B Zihlmann, P Zupranski, (Astro)-Particles Physics, and Student Lab and Education

Subjects
Quark, Physics, Nuclear and High Energy Physics, Particle physics, Photon, 010308 nuclear & particles physics, media_common.quotation_subject, Lepton-Nucleon Scattering, Compton scattering, FOS: Physical sciences, Parton, Polarization (waves), 01 natural sciences, Asymmetry, NO, High Energy Physics - Experiment, Transverse plane, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, ddc:530, High Energy Physics::Experiment, 010306 general physics, Nucleon, Nuclear Experiment, media_common
Abstract

Azimuthal asymmetries in exclusive electroproduction of real photons are measured for the first time with respect to transverse target polarisation, providing new constraints on Generalized Parton Distributions. From the same data set on a hydrogen target, new results for the beam-charge asymmetry are also extracted with better precision than those previously reported. By comparing model calculations with measured asymmetries attributed to the interference between the deeply virtual Compton scattering and Bethe-Heitler processes, a model-dependent constraint is obtained on the total angular momenta carried by up and down quarks in the nucleon., 24 pages, 10 figures, 2 tables; 1 figure,3 references added, slight text change

Published
2008

7. Electroproduction of Strangeness on Light Nuclei

Author

F. DOHRMANN, D. ABBOTT, A. AHMIDOUCH, P. AMBROZEWICZ, C.S. ARMSTRONG, J. ARRINGTON, R. ASATURYAN, K. ASSAMAGAN, S. AVERY, K. BAILEY, O.K. BAKER, S. BEEDOE, H. BITAO, H. BREUER, D.S. BROWN, R. CARLINI, J. CHA, N. CHANT, E. CHRISTY, A. COCHRAN, L. COLE, G. COLLINS, C. COTHRAN, J. CROWDER, W.J. CUMMINGS, S. DANAGOULIAN, F. DUNCAN, J. DUNNE, D. DUTTA, T. EDEN, M. ELAASAR, R. ENT, L. EWELL, H. FENKER, H.T. FORTUNE, Y. FUJII, L. GAN, H. GAO, K. GARROW, D.F. GEESAMAN, P. GUEYE, K. GUSTAFSSON, K. HAFIDI, J.O. HANSEN, W. HINTON, H.E. JACKSON, H. JUENGST, C. KEPPEL, A. KLEIN, D. KOLTENUK, Y. LIANG, J.H. LIU, A. LUNG, D. MACK, R. MADEY, P. MARKOWITZ, C.J. MARTOFF, D. MEEKINS, J. MITCHELL, T. MIYOSHI, H. MKRTCHYAN, R. MOHRING, S.K. MTINGWA, B. MUELLER, T.G. O’NEILL, G. NICULESCU, I. NICULESCU, D. POTTERVELD, J.W. PRICE, B.A. RAUE, P.E. REIMER, J. REINHOLD, J. ROCHE, P. ROOS, M. SARSOUR, Y. SATO, G. SAVAGE, R. SAWAFTA, R.E. SEGEL, A.YU. SEMENOV, S. STEPANYAN, V. TADEVOSIAN, S. TAJIMA, L. TANG, B. TERBURG, A. UZZLE, S. WOOD, H. YAMAGUCHI, C. YAN, L. YUAN, M. ZEIER, B. ZEIDMAN, and B. ZIHLMANN

Subjects
Physics, Light nucleus, Electroproduction, Nuclear Theory, Strangeness, Hyperons, Spectral function, Nuclear physics, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, Nuclear Experiment, Hypernuclear boundstates, Electroproduction of strangeness, Nuclear targets
Abstract

The A(e,e'K+)YX reaction has been investigated in Hall C at Jefferson Laboratory for 6 different targets. Data were taken for Q2)approx 0.35 and 0.5 GeV2) at a beam energy of 3.245GeV for 1)H, 2)H, 3)He, 4)He, C and Al targets. The missing mass spectra are fitted with Monte Carlo simulations taking into account the production of Lambda and Sigma0) hyperon production off the proton, and Sigma-) off the neutron. Models for quasifree production are compared to the data, excess yields close to threshold are attributed to FSI. Evidence for Lambda-hypernuclear bound states is seen for 3,4)He targets.

Published
2004

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