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Lambda 2001-2004
36 items
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1.
Hyperon polarization in $\nu_{\mu}$ charged current interaction at the NOMAD energies / Liang, Z ; Liu, C
We show that, in $\nu_\mu N\to \mu^-\Lambda X$ at the NOMAD energies, it is impossible to separate the products of the fragmentation of the struck quark from those of the nucleon remnant. The latter has a large contribution even in the current fragmentation region and has to be taken into account in calculating $\Lambda$ polarization using different pictures. [...]
hep-ph/0204323.- 2002 - 11 p. - Published in : Phys. Rev. D 66 (2002) 057302 Access to fulltext document: PDF; External link: hep-ph/0204323 PDF
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2.
Hyperon polarization in e^-p --> e^-HK with polarized electron beams / Liang, Z ; Xu, Q
We apply the picture proposed in a recent Letter for transverse hyperon polarization in unpolarized hadron-hadron collisions to the exclusive process e^-p --> e^-HK such as e^-p-->e^-\Lambda K^+, e^-p --> e^-\Sigma^+ K^0, or e^-p--> e^-\Sigma^0 K^+, or the similar process e^-p\to e^-n\pi^+ with longitudinally polarized electron beams. We present the predictions for the longitudinal polarizations of the hyperons or neutron in these reactions, which can be used as further tests of the picture..
hep-ph/0204322.- 2002 - 15 p. - Published in : Phys. Rev. D 65 (2002) 113012 Access to fulltext document: PDF; External link: hep-ph/0204322 PDF
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3.
Measurement of the $\Lambda$ hyperon polarization in $\nu_{\mu}$ charged current interactions in the NOMAD experiment / Popov, B A (CERN) /NOMAD Collaboration
The Lambda hyperon polarization in nu /sub mu / charged current interactions has been measured in the NOMAD experiment. The event sample (8087 reconstructed Lambda 's) is more than an order of magnitude larger than that of previous bubble chamber experiments, while the quality of the event reconstruction is comparable. [...]
Geneva : CERN, 2001 - Published in : Nucl. Phys. A 692 (2001) 73-80
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4.
Spin transfer in high-energy hadronization processes and polarization of hyperon in the lepton-induced reactions / Liu Chun Xiu ; Liang Zuo Tang
We show that measuring the polarization of the hyperon in the lepton induced reactions is an ideal way to study the spin transfer in high- energy hadronization processes. After a brief summary of the polarization of the initial quark or antiquark in these reactions, we give the calculation method of the polarization of the hyperon. [...]
2001 - Published in : High Energy Phys. Nucl. Phys. (Beijing): 25 (2001) , no. 6, pp. 476-86
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5.
Hyperon polarization in semi-inclusive deeply inelastic lepton-nucleon scattering at high energy / Liu, C ; Xu, Q ; Liang, Z
We calculate the polarizations for different octet hyperons produced in the current fragmentation regions of the deeply inelastic lepton-nucleon scatterings $\mu^-N \to \mu^- HX$ and $\nu_{\mu} N \to \mu^- HX$ at high energy using different models for spin transfer in fragmentation processes. The results show that measurements of those hyperon polarizations should provide useful information to distinguish between different models in particular the SU(6) and the DIS pictures used frequently in the literature. [...]
hep-ph/0106184.- 2001 - Published in : Phys. Rev. D 64 (2001) 073004 Access to fulltext document: PDF; External link: hep-ph/0106184 PDF
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6.
Spin observables in hyperon production / Maggiora, M ; Balestra, F ; Bedfer, Y ; Bertini, R ; Bland, L C ; Brochard, F ; Bussa, M P ; Chalyshev, V ; Choi, S ; Debowski, M et al.
The first exclusive measurements of the spin transfer parameter D sub N sub N in the reaction p-vectorp->pK sup +LAMBDA-vector has been performed at Saturne with the polarized beam and with the DISTO spectrometer. The results suggest an OBE mechanism dominated by kaon exchange..
2000 - Published in : Nucl. Phys. A 663-664 (2000) 477c-480c
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7.
Longitudinal spin transfer to the Lambda hyperon in leptoproduction / Belostotskii, S L
DESY-HERMES-2001-70. - 2001. - 12 p.
Fulltext from DESY
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8.
Lambda hyperon production mechanisms and longitudinal spin transfer at HERMES / Chiang Huan Ching
DESY-HERMES-2003-09. - 2003. - 50 p.
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9.
A lattice study of the spin structure of the Lambda hyperon / Göckeler, M ; Horsley, R ; Pleiter, D ; Rakow, P E L ; Schäfer, S ; Schäfer, A ; Schierholz, G
The internal spin structure of the Lambda is of special importance for the understanding of the spin structure of hadrons in general. The comparison between the nucleon and Lambda allows for a test of the relevant flavour-symmetry breaking effects. [...]
hep-lat/0208017; DESY-02-100; DESY-2002-100; EDINBURGH-2002-05; LU-ITP-2002-014.- Hamburg : DESY, 2002 - 14 p. - Published in : Phys. Lett. B 545 (2002) 112-118 Access to fulltext document: PDF; External link: hep-lat/0208017 PDF
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10.
The spin structure of the Lambda hyperon in quenched lattice QCD / Göckeler, M ; Horsley, R ; Pleiter, D ; Rakow, P E L ; Schäfer, S ; Schäfer, A ; Schierholz, G
It has been suggested to use the production of Lambda hyperons for investigating the nucleon spin structure. The viability of this idea depends crucially on the spin structure of the Lambda. [...]
hep-lat/0110057; DESY-2001-144; DESY-01-144.- Hamburg : DESY, 2002 - 3 p. - Published in : Nucl. Phys. B, Proc. Suppl. 106 (2002) 305-307 Access to fulltext document: PDF; External link: hep-lat/0110057 PDF
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11.
Lambda polarization measured at HERMES and Lambda spin structure / Belostotskii, S L ; Grebenyuk, O
DESY-HERMES-99-54. - 1999. - 6 p.
Fulltext from DESY
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12.
Up and Down Quark Contributions to Spin Content of Lambda from Fragmentation / Yang Jian Jun
We check the $u$ and $d$ quark contributions to the spin content of the $\Lambda$ by means of the $q\to\Lambda$ fragmentation and find that the $u$ and $d$ quarks of the $\Lambda$ are likely positively polarized. The parton distributions in the $\Lambda$ are given by a successful statistical model which can reproduce and correlate a vast body of polarized and unpolarized structure function and parton distribution data of the nucleon. [...]
hep-ph/0107222; USM-TH-109.- Valparadíso : Santa Maria Univ. Dept. Fís., 2001 - 14 p. - Published in : Phys. Lett. B 512 (2001) 57-64 Access to fulltext document: PDF; External link: hep-ph/0107222 PDF
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13.

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14.
Transverse polarization of Lambda hyperons produced inclusively in e N scattering at HERMES / Belostotskii, S L ; Grebenyuk, O
DESY-HERMES-2001-71. - 2001. - 4 p.
Fulltext from DESY
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15.
Longitudinal polarization of the Lambda in deep inelastic scattering of polarized positrons from nucleons / Schnell, G
DESY-HERMES-99-37. - 1999. - 166 p.
Fulltext from DESY
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16.
Ratio of $\sigma_L / \sigma_T$ for $p(e,e'K^+)\Lambda$ Extracted from Polarization Transfer / Raue, Brian A (Ohio U. ; Florida International U.)
The ratio of longitudinal to transverse structure functions, $\sigma_L/\sigma_T$, has been extracted from recent beam-recoil transferred polarization data for the $p(\vec e,e'K^+)\vec\Lambda$ reaction. [...]
nucl-ex/0402024. - 2004.
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17.
Transverse polarization of Lambda and Antilambda hyperons in quasi-real photon nucleon scattering / Brüll, A
DESY-HERMES-2002-51. - 2002. - 5 p.
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18.
Intrinsic polarized strangeness and $\Lambda^{0}$ polarization in deep-inelastic production / Ellis, Jonathan Richard ; Kotzinian, A M ; Naumov, D V
We propose a model for the longitudinal polarization of Lambda /sup 0 / baryons produced in deep-inelastic lepton scattering at any x/sub F /, based on static SU(6) quark-diquark wave functions and polarized intrinsic strangeness in the nucleon associated with individual valence quarks. The free parameters of the model are fixed by fitting NOMAD data on the longitudinal polarization of Lambda /sup 0/ hyperons in neutrino collisions. [...]
2002 - Published in : Eur. Phys. J. C 25 (2002) 603-13
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19.
Transversity and Lambda polarization / Anselmino, M
Two related issues are discussed, which might be easily explored by present and future COMPASS experiments. The first one deals with the new world of transversity, the fundamental polarized parton distribution so far totally unknown. [...]
hep-ph/0302008.- CERN, 2004 - 7 p. Fulltext: PDF; Published version from CERN: PDF; External link: hep-ph/0302008 PDF
In : Workshop on Future Physics at COMPASS, CERN, Geneva, Switzerland, 26 - 27 Sep 2002, pp.130 (CERN-2004-011)
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20.
First Measurement of Transferred Polarization in the Exclusive e p --> e' K+ Lambda Reaction / Carman, D S /CLAS Collaboration
The first measurements of the transferred polarization for the exclusive ep --> e'K+ Lambda reaction have been performed in Hall B at the Thomas Jefferson National Accelerator Facility using the CLAS spectrometer. A 2.567 GeV electron beam was used to measure the hyperon polarization over a range of Q2 from 0.3 to 1.5 (GeV/c)2, W from 1.6 to 2.15 GeV, and over the full center-of-mass angular range of the K+ meson. [...]
hep-ex/0212014.- 2003 - 6 p. - Published in : Phys. Rev. Lett. 90 (2003) 131804 External link: hep-ex/0212014 PDF
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21.
$\Lambda$ polarization in the target fragmentation region of SIDIS / Kotzinian, A M (CERN)
2001 - Published in : AIP Conf. Proc. 588 (2001) 272-276
In : 2nd Workshop on Physics with an Electron Polarized Light-Ion Collider, Cambridge, MA, USA, 14 - 16 Sep 2000, pp.272-276
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22.
Measurement of Lambda and Lambda-bar polarization in muon neutrino charged current interactions in NOMAD / Naumov, Dmitry V. /NOMAD Collaboration
The Lambda and Lambda-bar polarizations in muon neutrino charged current interactions have been measured in the NOMAD experiment. The event sample (8087 reconstructed Lambda's and 649 Lambda-bar's) is more than an order of magnitude larger than that of previous bubble chamber experiments, while the quality of event reconstruction is comparable. [...]
hep-ph/0206032.- Annecy-le-Vieux : Lab. Annecy Phys. Part., 2002 - 5 p. Access to fulltext document: PDF; Fulltext: v33p3791 - PDF; arXiv:hep-ph_0206032 - PDF; External link: Acta Physica Polonica Server
In : 10th International Workshop on Deep Inelastic Scattering, Krakow, Poland, 30 Apr - 4 May 2002, pp.3791-3796
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23.
Lambda Polarization in Deep-Inelastic Production / Naumov, D V
We propose a model for the longitudinal polarization of Lambda baryons produced in deep-inelastic lepton scattering at any xF, based on static SU(6) quark-diquark wave functions and polarized intrinsic strangeness in the nucleon associated with individual valence quarks. Free parameters of the model are fixed by fitting the NOMAD data on the longitudinal polarization of Lambda hyperons in neutrino interactions. [...]
hep-ph/0206031.- Annecy-le-Vieux : Lab. Annecy Phys. Part., 2002 - 5 p. - Published in : Acta Phys. Pol. B 33 (2002) 3803-3808 Access to fulltext document: PDF; External link: hep-ph/0206031 PDF
In : 10th International Workshop on Deep Inelastic Scattering, Krakow, Poland, 30 Apr - 4 May 2002
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24.
Intrinsic Polarized Strangeness and Lambda Polarization in Deep-Inelastic Production / Ellis, Jonathan Richard (CERN) ; Kotzinian, A M ; Naumov, D V
We propose a model for the longitudinal polarization of Lambda baryons produced in deep-inelastic lepton scattering at any xF, based on static SU(6) quark-diquark wave functions and polarized intrinsic strangeness in the nucleon associated with individual valence quarks. Free parameters of the model are fixed by fitting NOMAD data on the longitudinal polarization of Lambda hyperons in neutrino collisions. [...]
hep-ph/0204206; CERN-TH-2002-080.- Geneva : CERN, 2002 - Published in : Eur. Phys. J. C 25 (2002) 603-613 Access to fulltext document: PDF; External link: hep-ph/0204206 PDF - CERN library copies
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25.
Transverse Lambda polarization in inclusive processes / Anselmino, M ; Boer, D ; D'Alesio, U ; Murgia, F
A formalism proposed to study transverse Lambda polarization in unpolarized hadronic processes, based on a generalized pQCD factorization theorem, is extended to semi-inclusive DIS. Analytical expressions and examples of numerical estimates are given..
hep-ph/0201076.- 2003 - 8 p. - Published in : Int. J. Mod. Phys. A 18 (2003) 1237-1246 Access to fulltext document: PDF; External link: hep-ph/0201076 PDF
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26.
Polarization transfer in SIDIS for Lambda production / Arestov, Y
Polarization transfer from the longitudinally polarized positron to the final-state quark is considered for the underlying QCD subprocesses giving rise to the reaction e+(pol) + p --> e+ + Lambda(pol) + X at the HERMES energy..
physics/0111106. - 2001. - 4 p.
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27.
Transverse Lambda polarization in semi-inclusive DIS / Anselmino, M ; Boer, D ; D'Alesio, U ; Murgia, F
Extending a previous description of Lambda and Lambda-bar polarization in unpolarized p-p interactions, within a pQCD factorization scheme with new polarizing fragmentation functions, we give predictions for the transverse polarization of Lambda's and Lambda-bar's in semi-inclusive DIS, both with neutral and charged currents. Comparison with existing data is not yet significant, but more experimental results are expected in the near future..
hep-ph/0109186; DFTT-2001-28; INFNCA-TH-2001-08.- Torino : Torino Univ., 2002 - 10 p. - Published in : Phys. Rev. D 65 (2002) 114014 Access to fulltext document: PDF; External link: hep-ph/0109186 PDF
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28.
Longitudinal Lambda polarization in polarized semi-inclusive DIS / Anselmino, M ; Boglione, M ; D'Alesio, U ; Murgia, F
We calculate, within pQCD parton model at leading orders, the expression of the longitudinal polarization of Lambda baryons produced in polarized semi-inclusive DIS, including weak interaction effects. [...]
hep-ph/0106256. - 2001. - 4 p.
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29.
Transverse Lambda polarization in unpolarized semi-inclusive DIS / Anselmino, M ; Boer, D ; D'Alesio, U ; Murgia, F
The long-standing problem of transverse Lambda polarization in high-energy collisions of unpolarized hadrons can be tackled by considering new, spin and k_T-dependent quark fragmentation functions for an unpolarized quark into a polarized, spin-1/2 hadron [...]
hep-ph/0106254. - 2001. - 4 p.
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30.
Lambda-lambda bar polarization correlations / Sofer, A
Geneva : CERN, 1993.
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31.
Measurement of the $\overline{\Lambda}$ polarization in $\nu_\mu$ charged current interactions in the NOMAD experiment / NOMAD Collaboration
We present a measurement of the polarization of $\alam$ hyperons produced in $\nu_\mu$ charged current interactions. The full data sample from the NOMAD experiment has been analyzed using the same $\vo$ identification procedure and analysis method reported in a previous paper~\cite{NOMAD-polar} for the case of $\lam$ hyperons. [...]
hep-ex/0103047; CERN-EP-2001-028; CERN-EP-2001-028.- Geneva : CERN, 2001 - 14 p. - Published in : Nucl. Phys. B 605 (2001) 3-14 Fulltext: ep-2001-028 - PDF; arXiv:hep-ex_0103047 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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32.
Measurement of Lambda polarization in muon neutrino charged current interactions in NOMAD / Naumov, Dmitry V. (Dubna, JINR)
The Lambda polarization in muon neutrino charged current interactions has been measured in the NOMAD experiment. We observe negative polarization along the W - boson direction which is enhanced in the target fragmentation region: Px (xF < 0) = -0.21 +/- 0.04(stat) +/- 0.02(sys). [...]
hep-ph/0101325.- Dubna : Joint Inst. Nucl. Res., 2001-08-14 - 5 p. - Published in : AIP Conf. Proc. 570 (2000) 489-493 Access to fulltext document: PDF; Fulltext: PDF; External link: hep-ph/0101325 PDF
In : 14th International Spin Physics Symposium, Osaka, Japan, 16 - 21 Oct 2000, pp.489-493
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33.
Deep Inelastic Scattering of Leptons and Hadrons in the QCD Parton Model and Experimental Tests / Bourrely, C ; Soffer, J
We present the basic aspects of deep inelastic phenomena in the framework of the QCD parton model. After recalling briefly the standard kinematics, we discuss the physical interpretation of unpolarized and polarized structure functions in terms of parton distributions together with several important sum rules. [...]
hep-ph/0101195; CPT-4092.- 2002 - 29 p. - Published in : Academic Press (2002) , pp. 1565-1581 Fulltext: PDF; External link: hep-ph/0101195 PDF
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34.
Ratio of $\bar{\Lambda}/\Lambda$ in Semi-inclusive Electroproduction / Ma Bo Qiang ; Schmidt, Ivan ; Yang Jian Jun
It is shown that the $\bar{\Lambda}/\Lambda$ cross section ratio in semi-inclusive electroproduction of $\Lambda$ and $\bar{\Lambda}$ hyperons in deep inelastic scattering of charged lepton on a nucleon target, can provide useful information on the quark to $\Lambda$ fragmentation functions. This ratio is calculated explicitly in a quark-diquark model, a pQCD based analysis, and an SU(3) symmetry model, with three different options for the contribution from the unfavored fragmentation functions. [...]
hep-ph/0403010; USM-TH-140.- Valparadíso : Santa Maria Univ. Dept. Fís., 2003 - Published in : Phys. Lett. B 574 (2003) 35-40 Access to fulltext document: PDF; External link: hep-ph/0403010 PDF
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35.
Helicity and Transversity Distribution of Nucleon and $\Lambda$-Hyperon from $\Lambda$ Fragmentation / Ma, B Q ; Schmidt, I ; Soffer, J ; Yang Jian Jun
It is shown that $\Lambda$-hyperon fragmentation in charged lepton deep inelastic scattering (DIS) on a polarized nucleon target can provide sensitive information concerning the quark helicity and transversity distributions for both nucleon and $\Lambda$-hyperon at large $x$. Numerical predictions are given for the spin transfers of the produced $\Lambda$, when the target nucleon is polarized either longitudinally or transversely, and with the nucleon and $\Lambda$ quark distributions evaluated both in an SU(6) quark-spectator-diquark model and in a perturbative QCD (pQCD) based model. [...]
hep-ph/0103136; CPT-4045; USM-TH-97.- Valparadíso : Santa Maria Univ. Dept. Fís., 2001 - 16 p. - Published in : Phys. Rev. D 64 (2001) 014017 Access to fulltext document: PDF; External link: hep-ph/0103136 PDF
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36.
$q \to \Lambda$ Fragmentation Function and Nucleon Transversity Distribution in a Diquark Model / Yang Jian Jun
Based on a simple quark-diquark model, we propose a set of unpolarized, longitudinally polarized and transversely polarized fragmentation functions for the $\Lambda$ by fitting the unpolarized $\Lambda$ production data in $e^+ e ^- $ annihilation. It is found that the helicity structure of the obtained $\Lambda$ fragmentation functions is supported by the all available experimental data on the longitudinal $\Lambda$ polarization. [...]
hep-ph/0111382; USM-TH-117.- Valparadíso : Santa Maria Univ. Dept. Fís., 2002 - Published in : Nucl. Phys. A 699 (2002) 562-578 Access to fulltext document: PDF; External link: hep-ph/0111382 PDF
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