14 research outputs found
Total Cross Section Measurements With π- , Σ- And Protons On Nuclei And Nucleons Around 600 Gev/c
No full textTotal cross sections for Σ- and π- on beryllium, carbon, polyethylene and copper as well as total cross sections for protons on beryllium and carbon have been measured in a broad momentum range around 600GeV/c . These measurements were performed with a transmission technique in the SELEX hyperon-beam experiment at Fermilab. We report on results obtained for hadron-nucleus cross sections and on results for σtot(Σ-N) and σtot(π-N) , which were deduced from nuclear cross sections. © 2000 Elsevier Science B.V.57901/02/15277312Langland, J.L., (1995) Ph.D. Thesis, , University of IowaKleinfelder, S.A., (1988) IEEE Trans. Nucl. Sci., 35 (1)Dersch, U., (1998) Ph.D. Thesis, HeidelbergBiagi, S.F., (1981) Nucl. Phys. B, 186, pp. 1-21Bellettini, G., (1966) Nucl. Phys., 79, pp. 609-624Schiz, A.M., (1980) Phys. Rev. D, 21, pp. 3010-3022Murthy, P.V.R., (1975) Nucl. Phys. B, 92, pp. 269-308Caso, C., (1998) Eur. Phys. J. C, 3. , http://pdg.lbl.gov/1998/contents_plots.html, and data on total cross sections from computer readable filesSchiz, A.M., (1979) Ph.D. Thesis, , Yale University(1973) Landolt Börnstein Tables, 7. , Springer editionEngler, J., (1970) Phys. Lett. B, 32, pp. 716-719Babaev, A., (1974) Phys. Lett. B, 51, pp. 501-504Glauber, R.J., (1959) Boulder Lectures, pp. 315-413Franco, V., (1972) Phys. Rev. C, 6, pp. 748-757Karmanov, V.A., Kondratyuk, L.A., (1973) JETP Lett., 18, pp. 266-268Burq, J.P., (1983) Nucl. Phys. B, 217, pp. 285-335Gross, D., (1978) Phys. Rev. Lett., 41, pp. 217-220Beznogikh, G.G., (1972) Phys. Lett. B, 39, pp. 411-413Vorobyov, A.A., (1972) Phys. Lett. B, 41, pp. 639-641Foley, K.J., (1967) Phys. Rev. Lett., 19, pp. 857-859Fajardo, L.A., (1981) Phys. Rev. D, 24, pp. 46-65Jenni, P., (1977) Nucl. Phys. B, 129, pp. 232-252Breedon, R.E., (1989) Phys. Rev. Lett. B, 216, pp. 459-465Amos, N., (1983) Phys. Rev. Lett. B, 128, pp. 343-348Amaldi, U., (1977) Phys. Rev. Lett. B, 66, pp. 390-394Amos, N., (1985) Nucl. Phys. B, 262, pp. 689-714Akopin, V.D., (1977) Sov. J. Nucl. Phys., 25, pp. 51-55Amirkhanov, I.V., (1973) Sov. J. Nucl. Phys., 17, pp. 636-637Foley, K.J., (1969) Phys. Rev., 181, pp. 1775-1793Apokin, V.D., (1976) Nucl. Phys. B, 106, pp. 413-429Burq, J.P., (1982) Phys. Lett. B, 109, pp. 124-127Dakhno, L.G., (1983) Sov. J. Nucl. Phys., 37, pp. 590-598Kazarinov, M., (1976) Sov. Phys. JETP, 43, pp. 598-606De Jager, C.W., (1974) At. Data Nucl. Data Tables, 14, pp. 479-508Donnachie, A., Landshoff, P.V., (1992) Phys. Lett. B, 296, pp. 227-232Lipkin, H., (1975) Phys. Rev. D, 11, pp. 1827-1831Barnett, R.M., (1996) Phys. Rev. D, 54, pp. 191-192Carroll, A.S., (1979) Phys. Lett. B, 80, pp. 423-427Badier, J., (1972) Phys. Lett. B, 41, pp. 387-39
Confirmation of the doubly charmed baryon Epsilon(+)(cc)(3520) via its decay to pD(+)K(-)
No full textWe observe a signal for the doubly charmed baryon Xi(cc)(+) in the decay mode Xi(cc)(+) -> pD(+)K(-) to complement the previous cc reported decay Xi(cc)(+) -> Lambda(c)(+)K(-)pi(+) in data from SELEX, the charm hadroproduction experiment at Fermilab. In this new decay mode we observe an excess of 5.62 events over a combinatoric background estimated by event mixing to be 1.38 +/- 0.13 events. The mixed background has Gaussian statistics, giving a signal significance of 4.8 sigma. The Poisson probability that a background fluctuation can produce the apparent signal is less than 6.4 x 10(-4). The observed mass of this state is 3518 +/- 3 MeV/c(2), consistent with the published result. Averaging the two results gives a mass of 3518.7 +/- 1.7 MeV/c(2). The observation of this new weak decay mode confirms the previous SELEX suggestion that this state is a double charm baryon. The relative branching ratio for these two modes is 0.36 +/- 0.21. (c) 2005 Elsevier B.V. All rights reserved
The transverse momentum dependence of charged kaon Bose–Einstein correlations in the SELEX experiment
No full textAbstractWe report the measurement of the one-dimensional charged kaon correlation functions using 600GeV/c Σ−, π− and 540GeV/c p beams from the SELEX (E781) experiment at the Fermilab Tevatron. K±K± correlation functions are studied for three transverse pair momentum, kT, ranges and parameterized by a Gaussian form. The emission source radii, R, and the correlation strength, λ, are extracted. The analysis shows a decrease of the source radii with increasing kaon transverse pair momentum for all beam types
Hadronic production of Λc from 600 GeV/c π−, Σ− and p beams
No full textAbstractWe present data from Fermilab experiment E781 (SELEX) on the hadroproduction asymmetry for Λ̄c− compared to Λc+ as a function of xF, and on pt2 distributions for Λc+. These data were measured in the same apparatus using incident π−, Σ− beams at 600 GeV/c and proton beam at 540 GeV/c. The asymmetry is studied as a function of xF. In the forward hemisphere with xF⩾0.2 both baryon beams exhibit very strong preference for producing charm baryons rather than charm antibaryons, while the pion beam asymmetry is much smaller. In this energy regime the results show that beam fragments play a major role in the kinematics of Λc formation, as suggested by the leading quark picture
Radiative decay width of the a2(1320)− meson
No full textAbstractCoherent π+π−π− production in the interactions of a beam of 600GeV π− mesons with C, Cu and Pb nuclei has been studied with the SELEX facility (Experiment E781 at Fermilab). The a2(1320) meson signal has been detected in the Coulomb (low q2) region. The Primakoff formalism used to extract radiative decay width of this meson yields Γ=284±25±25keV, which is the most precise measurement to date
First Measurement Of π-e→π-eγ Pion Virtual Compton Scattering
No full textPion virtual compton scattering (VCS) via the reaction π-e→π-eγ was observed in the Fermilab E781 SELEX experiment. SELEX used a 600 GeV/c π- beam incident on target atomic electrons, detecting the incident π- and the final state π-, electron and γ. Theoretical predictions based on chiral perturbation theory are incorporated into a Monte Carlo simulation of the experiment and are compared to the data. The number of reconstructed events (=9) and their distribution with respect to the kinematic variables (for the kinematic region studied) are in reasonable accord with the predictions. The corresponding π- VCS experimental cross section is σ=38.8±13 nb, in agreement with the theoretical expectation of σ=34.7 nb.663346131346139Portales, J., Pennington, M.R., hep-ph/9407295Morgan, D., Pennington, M.R., (1991) Phys. Lett. B, 272, p. 134Babusci, D., Bellucci, S., Giordano, G., Matone, G., Sandorfi, A.M., Moinester, M.A., (1992) Phys. Lett. B, 277, p. 158Holstein, B.R., (1990) Comments Nucl. Part. Phys., 19, p. 221Klein, A., (1955) Phys. Rev., 99, p. 988Baldin, A.M., (1960) Nucl. Phys., 18, p. 310Petrun'kin, V.A., (1961) Sov. JETP, 40, p. 1148Antipov, Yu.M., (1983) Phys. Lett., 121 B, p. 445(1985) Z. Phys. C, 26, p. 495Aibergenov, T.A., Baranov, P.S., Beznisko, O.D., Cherepniya, S.N., Filkov, L.V., Nafikov, A.A., Osadchii, A.I., Tamm, E.I., (1986) Czech. J. Phys., Sect. A, 36, p. 948Boyer, J., (1990) Phys. Rev. D, 42, p. 1350Scherer, S., (1999) Few-Body Syst., Suppl., 11, p. 327(1999) Czech. J. Phys., 49, p. 1307Unkmeir, C., Scherer, S., L'Vov, A.I., Drechsel, D., (2000) Phys. Rev. D, 61, p. 034002L'Vov, A.I., Scherer, S., Pasquini, B., Unkmeir, C., Drechsel, D., (2001) Phys. Rev. C, 64, p. 015203Kerhoas, S., (2000) Nucl. Phys., A666-A667, p. 44Roche, J., (2000) Phys. Rev. Lett., 85, p. 708Pasquini, B., Scherer, S., Drechsel, D., (2001) Phys. Rev. C, 63, p. 025205nucl-th/0105074, and references thereinRuss, J., (1987) A proposal to construct SELEX, , http://fn781a.fnal.gov/, Proposal PE781, FermilabUnkmeir, C., Ocherashvili, A., Fuchs, T., Moinester, M.A., Scherer, S., (2002) Phys. Rev. C, 65, p. 015201Ocherashvili, A., (2000), http://www-nuclear.tau.ac.il/~aharon/phd.html, Ph.D. thesis, Tel Aviv UniversityUnkmeir, C., (2000), Ph.D. thesis, Johannes Gutenberg University, MainzFuchs, T., Pasquini, B., Unkmeir, C., Scherer, S., hep-ph/0010218Lepage, G.P., (1978) J. Comput. Phys., 27, p. 192Bjorken, J.D., Drell, S.D., (1964) Relativistic Quantum Mechanics, , McGraw-Hill, New YorkByckling, E., Kajantie, K., (1973) Particle Kinematics State, pp. 102-145. , Wiley, New YorkVorwalter, K., (1998), Ph.D. thesis, MPI, HeidelbergKrüger, H., (1999), Ph.D. thesis, MPI, HeidelbergDavidenko, G., (1996) Proceedings of the International Conference on Computing in High Energy Physics '95, p. 832. , World Scientific, Singapore, edited by R. Shellard and T. NguyenDirkes, G., Krüger, H., Kuropatkin, N.P., Simon, J., Data and GE781 Comparison for Elastic Scattering Physics, , MPI, Heidelberg, in pressSteiner, V., private communicationGiller, I., (1999), M.Sc. thesis, Tel Aviv UniversityEschrich, I., (2001) Phys. Lett. B, 522, p. 233Caso, C., (1998) Eur. Phys. J. C, 3, p. 1Brandt, S., (1998) Data Analysis: Statistical and Computational Methods for Scientists and Engineers, , Springer-Verlag, BerlinSimon, J., (2000), Ph.D. thesis, MPI, HeidelbergDirkes, G., (1999), M.Sc. thesis, MPI, HeidelbergPress, W.H., Teukolsky, S.A., Vetterling, W.T., Flannery, B.P., (1992) Numerical Recipes in FORTRAN: The Art of Scientific Computing, 2nd ed., pp. 617-622. , Cambridge Universit
Observation Of The Cabibbo-suppressed Decay ξc+ π K- π+
No full textWe report the first observation of the Cabihbo-suppressed charm baryon decay ξc+ → pK- π+. We observe 150 ± 22 ± 5 events for the signal. The data were accumulated using the SELEX spectrometer during the 1996-1997 fixed target run at Fermilab, chiefly from a 600 GeV/c Σ- beam. The branching fractions of the decay relative to the Cabibbo-favored ξc+ → Σ + K- π and ξ+ →c+ →- ξ+ π+ π+ are measured to he B(ξc+ → pK- π+)/B(ξc+ → Σ- π+ K π+) = 0.22 ± 0.06 ± 0.03 and B(ξc+ → ξ π+π+pK- π+)/B(ξc+ →- π+ π+) = 0.20 ± 0.04 ± 0.02, respectively.84918571861Körner, J.G., Krämer, M., (1992) Z. Phys. C, 55, p. 659Bauer, M., Stech, B., Wirbel, M., (1987) Z. Phys. C, 34, p. 103Alexander, J.P., (1996) Phys. Rev. D, 53, pp. R1013Frabetti, P.L., (1993) Phys. Lett. B, 314, p. 477Russ, J.S., Proceedings of the 29th International Conference on High Energy Physics, 1998, 2, p. 1259. , edited by A. Astbury et al. (World Scientific, Singapore, 1998), hep-ex/9812031Engelfried, J., (1999) Nucl. Instrum. Methods Phys. Res., Sect. A, 431, p. 53Caso, C., (1998) Eur. Phys. J., C3, p. 1Bergfeld, T., (1996) Phys. Lett. B, 365, p. 43
First Observation Of The Doubly Charmed Baryon Ξcc+
No full textThe first experimental evidence for one of the six predicted baryon states which contain two valence charmed quarks-the doubly charmed baryons. As such, there were many predictions of the masses and other properties of these states. The properties of doubly charmed baryons provide a new window into the structure of baryonic matter.8911112001/1112001/5Groom, D.E., (2000) Eur. Phys. J. C, 15, p. 1. , Particle Data GroupDerujula, A., Georgi, H., Glashow, S., (1975) Phys. Rev. D, 12, p. 147Savage, M., Wise, M., (1990) Phys. Lett. B, 248, p. 177Körner, J.G., Krämer, M., Pirjol, D., (1994) Prog. Part. Nucl. Phys., 33, p. 787hep-ph/0201071, see Refs. [111-124]Mattson, M., (2002), Ph.D. thesis, Carnegie Mellon UniversityRuss, J.S., (1998) Proceedings of the 29th International Conference on High Energy Physics, 1998, 2, p. 1259. , SELEX Collaborationedited by A. Astbury (World Scientific, Singapore,)hep-ex/9812031Engelfried, J., (1999) Nucl. Instrum. Methods Phys. Res., Sect. A, 431, p. 53Kushnirenko, A., (2001) Phys. Rev. Lett., 86, p. 5243Garcia, F., (2002) Phys. Lett. B, 528, p. 49noteMoinester, M., (1996) Z. Phys. A, 355, p. 349Kiselev, V., Likhoded, A., (2001), hep-ph/0103169and references thereinBjorken, J.B., (1985), Report No. Fermilab-Conf-85/69Aoki, S., (1987) Phys. Lett. B, 187, p. 185Barlag, S., (1991) Phys. Lett. B, 257, p. 519. , ACCMOR CollaborationRatti, S., Proceedings of the 5th International Conference on Hyperons, Charm and Beauty Hadrons, Vancouver, B.C., 2002, , www.hep.vanderbilt.edu/-stenson/xicc/xicc_focus.html, (to be published)Abe, K., Belle Collaborationhep-ex/020510
Nuclear Dependence Of Charm Production
No full textUsing data taken by SELEX during the 1996-1997 fixed target run at Fermilab, we study the production of charmed hadrons on copper and carbon targets with ∑ -, p, π -, and π + beams. Parametrizing the dependence of the inclusive production cross section on the atomic number A as A α, we determine α for D +, D 0, D s +, D +(2010), Λ c +, and their respective anti-particles, as a function of their transverse momentum p t and scaled longitudinal momentum x F . Within our statistics there is no dependence of α on x F for any charm species for the interval 0.1<x F <1.0. The average value of α for charm production by pion beams is α meson=0.850±0.028. This is somewhat larger than the corresponding average α baryon=0.755±0.016 for charm production by baryon beams (∑ -, p). © 2009 Springer-Verlag/Società Italiana di Fisica.644637644Cobbaert, H., (1987) Phys. Lett. B, 191, p. 456. , 10.1016/0370-2693(87)90639-3 1987PhLB.191.456CCobbaert, H., (1988) Phys. Lett. B, 206, p. 546. , 10.1016/0370-2693(88)91627-9Cobbaert, H., (1988) Phys. Lett. B, 213, p. 395. , 10.1016/0370-2693(88)91783-2 1988PhLB.213.395CLeitch, M.J., (2000) Phys. Rev. Lett., 84, p. 3256. , 10.1103/PhysRevLett.84.3256 2000PhRvL.84.3256L arXiv:nucl-ex/9909007Alessandro, B., Alexa, C., Arnaldi, R., Atayan, M., Baglin, C., Baldit, A., Beole, S., Willis, N., Charmonium production and nuclear absorption in p-A interactions at 450 GeV (2004) European Physical Journal C, 33 (1), pp. 31-40. , DOI 10.1140/epjc/s2003-01539-yAbt, I., (2009) Eur. Phys. J. C, 60, p. 525. , 10.1140/epjc/s10052-009-0965-7 2009EPJC.60.525A arXiv:0812.0734 [hep-ex]Heller, K.J., (1977) Phys. Rev. D, 16, p. 2737. , 10.1103/PhysRevD.16.2737 1977PhRvD.16.2737HSkubic, P., (1978) Phys. Rev. D, 18, p. 3115. , 10.1103/PhysRevD.18.3115 1978PhRvD.18.3115SAleev, A.N., (1987) Sov. J. Nucl. Phys., 46, p. 657. , [Yad. Fiz. 46, 1127 (1987)]Vecko, M., (1989) Czech. J. Phys. B, 39, p. 297. , 10.1007/BF01597781 1989CzJPh.39.297VAdamovich, M., (1992) Phys. Lett. B, 284, p. 453. , 10.1016/0370-2693(92)90460-L 1992PhLB.284.453AAlves, G.A., (1993) Phys. Rev. Lett., 70, p. 722. , 10.1103/PhysRevLett.70.722 1993PhRvL.70.722AAlves, G.A., (1994) Phys. Rev. D, 49, p. 4317. , 10.1103/PhysRevD.49.R4317 1994PhRvD.49.4317ALeitch, M.J., (1994) Phys. Rev. Lett., 72, p. 2542. , 10.1103/PhysRevLett.72.2542 1994PhRvL.72.2542LAdamovich, M., (1997) Nucl. Phys. B, 495, p. 3. , 10.1016/S0550-3213(97)00223-X 1997NuPhB.495.3AApanasevich, L., (1997) Phys. Rev. D, 56, p. 1391. , 10.1103/PhysRevD.56.1391 1997PhRvD.56.1391A arXiv:hep-ex/9702014Abt, I., (2007) Eur. Phys. J. C, 52, p. 531. , 10.1140/epjc/s10052-007-0427-z 2007EPJC.52.531A arXiv:0708.1443 [hep-ex]Duffy, M.E., (1985) Phys. Rev. Lett., 55, p. 1816. , 10.1103/PhysRevLett.55.1816 1985PhRvL.55.1816DVogt, R., The A dependence of open charm and bottom production (2003) International Journal of Modern Physics E, 12 (2), pp. 211-269. , DOI 10.1142/S0218301303001272Lourenco, C., Wohri, H.K., Heavy-flavour hadro-production from fixed-target to collider energies (2006) Physics Reports, 433 (3), pp. 127-180. , DOI 10.1016/j.physrep.2006.05.005, PII S0370157306001815Frawley, A.D., Ullrich, T., Vogt, R., (2008) Phys. Rept., 462, p. 125. , 10.1016/j.physrep.2008.04.002 2008PhR.462.125F arXiv:0806.1013 [nucl-ex]Russ, J.S., (1998) Proceedings of the 29th International Conference on High Energy Physics II World Scientific Singapore, 1259. , A. Astbury (eds), et al. arXiv:hep-ex/9812031Russ, J.S., (1998) Proceedings of the 29th International Conference on High Energy Physics, 2, p. 1259. , ed. by A. Astbury, et al. (World Scientific, Singapore) arXiv:hep-ex/9812031Engelfried, J., (1999) Nucl. Instrum. Methods A, 431, p. 53. , 10.1016/S0168-9002(99)00043-1 1999NIMPA.431.53E arXiv:hep-ex/9811001Kushnirenko, A., Alkhazov, G., Atamantchouk, A.G., Balatz, M.Y., Bondar, N.F., Cooper, P.S., Dauwe, L.J., Vishnyakov, V.E., Precision measurements of the ∧c+ and D 0 lifetimes (2001) Physical Review Letters, 86 (23), pp. 5243-5246. , DOI 10.1103/PhysRevLett.86.5243Garcia, F.G., (2002) Phys. Lett. B, 528, p. 49. , 10.1016/S0370-2693(01)01484-8 2002PhLB.528.49S arXiv:hep-ex/0109017Kaya, M., (2003) Phys. Lett. B, 558, p. 34. , 10.1016/S0370-2693(03)00246-6 2003PhLB.558.34S arXiv:hep-ex/0302039Brodsky, S.J., Kopeliovich, B., Schmidt, I., Soffer, J., (2006) Phys. Rev. D, 73, p. 113005. , 2006PhRvD.73k3005B arXiv:hep-ph/0603238Adamovich, M.I., (2003) Eur. Phys. J. C, 26, p. 357. , 10.1140/epjc/s2002-01073-6 2003EPJC.26.357WA. Blanco-Covarrubias, et al. (SELEX Collaboration), in preparatio
