Polarization of Λ and over(Λ, ̄) in 920 GeV fixed-target proton-nucleus collisions

I. Abt; M. Adams; M. Agari; H. Albrecht; A. Aleksandrov; V. Amaral; A. Amorim; S. J. Aplin; V. Aushev; Y. Bagaturia; V. Balagura; M. Bargiotti; O. Barsukova; J. Bastos; J. Batista; C. Bauer; Th S. Bauer; A. Belkov; Ar Belkov; I. Belotelov; A. Bertin; B. Bobchenko; M. Böcker; A. Bogatyrev; G. Bohm; M. Bräuer; M. Bruinsma; M. Bruschi; P. Buchholz; T. Buran; J. Carvalho; P. Conde; C. Cruse; M. Dam; K. M. Danielsen; M. Danilov; S. De Castro; H. Deppe; X. Dong; H. B. Dreis; V. Egorytchev; K. Ehret; F. Eisele; D. Emeliyanov; S. Erhan; S. Essenov; L. Fabbri; P. Faccioli; M. Feuerstack-Raible; J. Flammer; B. Fominykh; M. Funcke; Ll Garrido; A. Gellrich; B. Giacobbe; J. Gläß; D. Goloubkov; Y. Golubkov; A. Golutvin; I. Golutvin; I. Gorbounov; A. Gorišek; O. Gouchtchine; D. C. Goulart; S. Gradl; W. Gradl; F. Grimaldi; Yu Guilitsky; J. D. Hansen; J. M. Hernández; W. Hofmann; M. Hohlmann; T. Hott; W. Hulsbergen; U. Husemann; O. Igonkina; M. Ispiryan; T. Jagla; C. Jiang; H. Kapitza; S. Karabekyan; N. Karpenko; S. Keller; J. Kessler; F. Khasanov; Yu Kiryushin; I. Kisel; E. Klinkby; K. T. Knöpfle; H. Kolanoski; S. Korpar; C. Krauss; P. Kreuzer; P. Križan; D. Krücker; S. Kupper; T. Kvaratskheliia; A. Lanyov; K. Lau; B. Lewendel; T. Lohse; B. Lomonosov; R. Männer; R. Mankel; S. Masciocchi; I. Massa; I. Matchikhilian; G. Medin; M. Medinnis; M. Mevius; A. Michetti; Yu Mikhailov; R. Mizuk; R. Muresan; M. zur Nedden; M. Negodaev; M. Nörenberg; S. Nowak; M. T. Núñez Pardo de Vera; M. Ouchrif; F. Ould-Saada; C. Padilla; D. Peralta; R. Pernack; R. Pestotnik; B. AA Petersen; M. Piccinini; M. A. Pleier; M. Poli; V. Popov; D. Pose; S. Prystupa; V. Pugatch; Y. Pylypchenko; J. Pyrlik; K. Reeves; D. Reßing; H. Rick; I. Riu; P. Robmann; I. Rostovtseva; V. Rybnikov; F. Sánchez; A. Sbrizzi; M. Schmelling; B. Schmidt; A. Schreiner; H. Schröder; U. Schwanke; A. J. Schwartz; A. S. Schwarz; B. Schwenninger; B. Schwingenheuer; F. Sciacca; N. Semprini-Cesari; S. Shuvalov; L. Silva; L. Sözüer; S. Solunin; A. Somov; S. Somov; J. Spengler; R. Spighi; A. Spiridonov; A. Stanovnik; M. Starič; C. Stegmann; H. S. Subramania; M. Symalla; I. Tikhomirov; M. Titov; I. Tsakov; U. Uwer; C. van Eldik; Yu Vassiliev; M. Villa; A. Vitale; I. Vukotic; H. Wahlberg; A. H. Walenta; M. Walter; J. J. Wang; D. Wegener; U. Werthenbach; H. Wolters; R. Wurth; A. Wurz; Yu Zaitsev; M. Zavertyaev; T. Zeuner; A. Zhelezov; Z. Zheng; R. Zimmermann; T. Živko; A. Zoccoli

doi:10.1016/j.physletb.2006.05.040

Polarization of Λ and over(Λ, ̄) in 920 GeV fixed-target proton-nucleus collisions

I. Abt
, M. Adams
, M. Agari
, H. Albrecht
, A. Aleksandrov
, V. Amaral
, A. Amorim
, S. J. Aplin
, V. Aushev
, Y. Bagaturia
, V. Balagura
, M. Bargiotti
, O. Barsukova
, J. Bastos
, J. Batista
, C. Bauer
, Th S. Bauer
, A. Belkov
, Ar Belkov
, I. Belotelov

A. Bertin, B. Bobchenko, M. Böcker, A. Bogatyrev, G. Bohm, M. Bräuer, M. Bruinsma, M. Bruschi, P. Buchholz, T. Buran, J. Carvalho, P. Conde, C. Cruse, M. Dam, K. M. Danielsen, M. Danilov, S. De Castro, H. Deppe, X. Dong, H. B. Dreis, V. Egorytchev, K. Ehret, F. Eisele, D. Emeliyanov, S. Erhan, S. Essenov, L. Fabbri, P. Faccioli, M. Feuerstack-Raible, J. Flammer, B. Fominykh, M. Funcke, Ll Garrido, A. Gellrich, B. Giacobbe, J. Gläß, D. Goloubkov, Y. Golubkov, A. Golutvin, I. Golutvin, I. Gorbounov, A. Gorišek, O. Gouchtchine, D. C. Goulart, S. Gradl, W. Gradl, F. Grimaldi, Yu Guilitsky, J. D. Hansen, J. M. Hernández, W. Hofmann, M. Hohlmann, T. Hott, W. Hulsbergen, U. Husemann, O. Igonkina, M. Ispiryan, T. Jagla, C. Jiang, H. Kapitza, S. Karabekyan, N. Karpenko, S. Keller, J. Kessler, F. Khasanov, Yu Kiryushin, I. Kisel, E. Klinkby, K. T. Knöpfle, H. Kolanoski, S. Korpar, C. Krauss, P. Kreuzer, P. Križan, D. Krücker, S. Kupper, T. Kvaratskheliia, A. Lanyov, K. Lau, B. Lewendel, T. Lohse, B. Lomonosov, R. Männer, R. Mankel, S. Masciocchi, I. Massa, I. Matchikhilian, G. Medin, M. Medinnis, M. Mevius, A. Michetti, Yu Mikhailov, R. Mizuk, R. Muresan, M. zur Nedden, M. Negodaev, M. Nörenberg, S. Nowak, M. T. Núñez Pardo de Vera, M. Ouchrif, F. Ould-Saada, C. Padilla, D. Peralta, R. Pernack, R. Pestotnik, B. AA Petersen, M. Piccinini, M. A. Pleier, M. Poli, V. Popov, D. Pose, S. Prystupa, V. Pugatch, Y. Pylypchenko, J. Pyrlik, K. Reeves, D. Reßing, H. Rick, I. Riu, P. Robmann, I. Rostovtseva, V. Rybnikov, F. Sánchez, A. Sbrizzi, M. Schmelling, B. Schmidt, A. Schreiner, H. Schröder, U. Schwanke, A. J. Schwartz, A. S. Schwarz, B. Schwenninger, B. Schwingenheuer, F. Sciacca, N. Semprini-Cesari, S. Shuvalov, L. Silva, L. Sözüer, S. Solunin, A. Somov, S. Somov, J. Spengler, R. Spighi, A. Spiridonov, A. Stanovnik, M. Starič, C. Stegmann, H. S. Subramania, M. Symalla, I. Tikhomirov, M. Titov, I. Tsakov, U. Uwer, C. van Eldik, Yu Vassiliev, M. Villa, A. Vitale, I. Vukotic, H. Wahlberg, A. H. Walenta, M. Walter, J. J. Wang, D. Wegener, U. Werthenbach, H. Wolters, R. Wurth, A. Wurz, Yu Zaitsev, M. Zavertyaev, T. Zeuner, A. Zhelezov, Z. Zheng, R. Zimmermann, T. Živko, A. Zoccoli

Research output: Contribution to journal › Article › peer-review

Abstract

A measurement of the polarization of Λ and over(Λ, ̄) baryons produced in pC and pW collisions at sqrt(s) = 41.6 GeV has been performed with the HERA-B spectrometer. The measurements cover the kinematic range of 0.6 GeV / c < p_⊥ < 1.2 GeV / c in transverse momentum and - 0.15 < x_F < 0.01 in Feynman-x. The polarization results from the two different targets agree within the statistical error. In the combined data set, the largest deviation from zero, + 0.054 ± 0.029, is measured for x_F ≲ - 0.07. Zero polarization is expected at x_F = 0 in the absence of nuclear effects. The polarization results for the Λ agree with a parametrization of previous measurements which were performed at positive x_F values, where the Λ polarization is negative. Results of over(Λ, ̄) polarization measurements are consistent with zero.

Original language	English
Pages (from-to)	415-421
Number of pages	7
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	638
Issue number	5-6
DOIs	https://doi.org/10.1016/j.physletb.2006.05.040
Publication status	Published - 20 Jul 2006
Externally published	Yes

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10.1016/j.physletb.2006.05.040

Cite this

Abt, I., Adams, M., Agari, M., Albrecht, H., Aleksandrov, A., Amaral, V., Amorim, A., Aplin, S. J., Aushev, V., Bagaturia, Y., Balagura, V., Bargiotti, M., Barsukova, O., Bastos, J., Batista, J., Bauer, C., Bauer, T. S., Belkov, A., Belkov, A., ... Zoccoli, A. (2006). Polarization of Λ and over(Λ, ̄) in 920 GeV fixed-target proton-nucleus collisions. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 638(5-6), 415-421. https://doi.org/10.1016/j.physletb.2006.05.040

@article{5001b660c8b247edabe324c97595dfa7,

title = "Polarization of Λ and over(Λ,{\= }) in 920 GeV fixed-target proton-nucleus collisions",

abstract = "A measurement of the polarization of Λ and over(Λ,{\= }) baryons produced in pC and pW collisions at sqrt(s) = 41.6 GeV has been performed with the HERA-B spectrometer. The measurements cover the kinematic range of 0.6 GeV / c < p⊥ < 1.2 GeV / c in transverse momentum and - 0.15 < xF < 0.01 in Feynman-x. The polarization results from the two different targets agree within the statistical error. In the combined data set, the largest deviation from zero, + 0.054 ± 0.029, is measured for xF ≲ - 0.07. Zero polarization is expected at xF = 0 in the absence of nuclear effects. The polarization results for the Λ agree with a parametrization of previous measurements which were performed at positive xF values, where the Λ polarization is negative. Results of over(Λ,{\= }) polarization measurements are consistent with zero.",

author = "I. Abt and M. Adams and M. Agari and H. Albrecht and A. Aleksandrov and V. Amaral and A. Amorim and Aplin, \{S. J.\} and V. Aushev and Y. Bagaturia and V. Balagura and M. Bargiotti and O. Barsukova and J. Bastos and J. Batista and C. Bauer and Bauer, \{Th S.\} and A. Belkov and Ar Belkov and I. Belotelov and A. Bertin and B. Bobchenko and M. B{\"o}cker and A. Bogatyrev and G. Bohm and M. Br{\"a}uer and M. Bruinsma and M. Bruschi and P. Buchholz and T. Buran and J. Carvalho and P. Conde and C. Cruse and M. Dam and Danielsen, \{K. M.\} and M. Danilov and \{De Castro\}, S. and H. Deppe and X. Dong and Dreis, \{H. B.\} and V. Egorytchev and K. Ehret and F. Eisele and D. Emeliyanov and S. Erhan and S. Essenov and L. Fabbri and P. Faccioli and M. Feuerstack-Raible and J. Flammer and B. Fominykh and M. Funcke and Ll Garrido and A. Gellrich and B. Giacobbe and J. Gl{\"a}{\ss} and D. Goloubkov and Y. Golubkov and A. Golutvin and I. Golutvin and I. Gorbounov and A. Gori{\v s}ek and O. Gouchtchine and Goulart, \{D. C.\} and S. Gradl and W. Gradl and F. Grimaldi and Yu Guilitsky and Hansen, \{J. D.\} and Hern{\'a}ndez, \{J. M.\} and W. Hofmann and M. Hohlmann and T. Hott and W. Hulsbergen and U. Husemann and O. Igonkina and M. Ispiryan and T. Jagla and C. Jiang and H. Kapitza and S. Karabekyan and N. Karpenko and S. Keller and J. Kessler and F. Khasanov and Yu Kiryushin and I. Kisel and E. Klinkby and Kn{\"o}pfle, \{K. T.\} and H. Kolanoski and S. Korpar and C. Krauss and P. Kreuzer and P. Kri{\v z}an and D. Kr{\"u}cker and S. Kupper and T. Kvaratskheliia and A. Lanyov and K. Lau and B. Lewendel and T. Lohse and B. Lomonosov and R. M{\"a}nner and R. Mankel and S. Masciocchi and I. Massa and I. Matchikhilian and G. Medin and M. Medinnis and M. Mevius and A. Michetti and Yu Mikhailov and R. Mizuk and R. Muresan and \{zur Nedden\}, M. and M. Negodaev and M. N{\"o}renberg and S. Nowak and \{N{\'u}{\~n}ez Pardo de Vera\}, \{M. T.\} and M. Ouchrif and F. Ould-Saada and C. Padilla and D. Peralta and R. Pernack and R. Pestotnik and Petersen, \{B. AA\} and M. Piccinini and Pleier, \{M. A.\} and M. Poli and V. Popov and D. Pose and S. Prystupa and V. Pugatch and Y. Pylypchenko and J. Pyrlik and K. Reeves and D. Re{\ss}ing and H. Rick and I. Riu and P. Robmann and I. Rostovtseva and V. Rybnikov and F. S{\'a}nchez and A. Sbrizzi and M. Schmelling and B. Schmidt and A. Schreiner and H. Schr{\"o}der and U. Schwanke and Schwartz, \{A. J.\} and Schwarz, \{A. S.\} and B. Schwenninger and B. Schwingenheuer and F. Sciacca and N. Semprini-Cesari and S. Shuvalov and L. Silva and L. S{\"o}z{\"u}er and S. Solunin and A. Somov and S. Somov and J. Spengler and R. Spighi and A. Spiridonov and A. Stanovnik and M. Stari{\v c} and C. Stegmann and Subramania, \{H. S.\} and M. Symalla and I. Tikhomirov and M. Titov and I. Tsakov and U. Uwer and \{van Eldik\}, C. and Yu Vassiliev and M. Villa and A. Vitale and I. Vukotic and H. Wahlberg and Walenta, \{A. H.\} and M. Walter and Wang, \{J. J.\} and D. Wegener and U. Werthenbach and H. Wolters and R. Wurth and A. Wurz and Yu Zaitsev and M. Zavertyaev and T. Zeuner and A. Zhelezov and Z. Zheng and R. Zimmermann and T. {\v Z}ivko and A. Zoccoli",

year = "2006",

month = jul,

day = "20",

doi = "10.1016/j.physletb.2006.05.040",

language = "English",

volume = "638",

pages = "415--421",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

number = "5-6",

}

Abt, I, Adams, M, Agari, M, Albrecht, H, Aleksandrov, A, Amaral, V, Amorim, A, Aplin, SJ, Aushev, V, Bagaturia, Y, Balagura, V, Bargiotti, M, Barsukova, O, Bastos, J, Batista, J, Bauer, C, Bauer, TS, Belkov, A, Belkov, A, Belotelov, I, Bertin, A, Bobchenko, B, Böcker, M, Bogatyrev, A, Bohm, G, Bräuer, M, Bruinsma, M, Bruschi, M, Buchholz, P, Buran, T, Carvalho, J, Conde, P, Cruse, C, Dam, M, Danielsen, KM, Danilov, M, De Castro, S, Deppe, H, Dong, X, Dreis, HB, Egorytchev, V, Ehret, K, Eisele, F, Emeliyanov, D, Erhan, S, Essenov, S, Fabbri, L, Faccioli, P, Feuerstack-Raible, M, Flammer, J, Fominykh, B, Funcke, M, Garrido, L, Gellrich, A, Giacobbe, B, Gläß, J, Goloubkov, D, Golubkov, Y, Golutvin, A, Golutvin, I, Gorbounov, I, Gorišek, A, Gouchtchine, O, Goulart, DC, Gradl, S, Gradl, W, Grimaldi, F, Guilitsky, Y, Hansen, JD, Hernández, JM, Hofmann, W, Hohlmann, M, Hott, T, Hulsbergen, W, Husemann, U, Igonkina, O, Ispiryan, M, Jagla, T, Jiang, C, Kapitza, H, Karabekyan, S, Karpenko, N, Keller, S, Kessler, J, Khasanov, F, Kiryushin, Y, Kisel, I, Klinkby, E, Knöpfle, KT, Kolanoski, H, Korpar, S, Krauss, C, Kreuzer, P, Križan, P, Krücker, D, Kupper, S, Kvaratskheliia, T, Lanyov, A, Lau, K, Lewendel, B, Lohse, T, Lomonosov, B, Männer, R, Mankel, R, Masciocchi, S, Massa, I, Matchikhilian, I, Medin, G, Medinnis, M, Mevius, M, Michetti, A, Mikhailov, Y, Mizuk, R, Muresan, R, zur Nedden, M, Negodaev, M, Nörenberg, M, Nowak, S, Núñez Pardo de Vera, MT, Ouchrif, M, Ould-Saada, F, Padilla, C, Peralta, D, Pernack, R, Pestotnik, R, Petersen, BAA, Piccinini, M, Pleier, MA, Poli, M, Popov, V, Pose, D, Prystupa, S, Pugatch, V, Pylypchenko, Y, Pyrlik, J, Reeves, K, Reßing, D, Rick, H, Riu, I, Robmann, P, Rostovtseva, I, Rybnikov, V, Sánchez, F, Sbrizzi, A, Schmelling, M, Schmidt, B, Schreiner, A, Schröder, H, Schwanke, U, Schwartz, AJ, Schwarz, AS, Schwenninger, B, Schwingenheuer, B, Sciacca, F, Semprini-Cesari, N, Shuvalov, S, Silva, L, Sözüer, L, Solunin, S, Somov, A, Somov, S, Spengler, J, Spighi, R, Spiridonov, A, Stanovnik, A, Starič, M, Stegmann, C, Subramania, HS, Symalla, M, Tikhomirov, I, Titov, M, Tsakov, I, Uwer, U, van Eldik, C, Vassiliev, Y, Villa, M, Vitale, A, Vukotic, I, Wahlberg, H, Walenta, AH, Walter, M, Wang, JJ, Wegener, D, Werthenbach, U, Wolters, H, Wurth, R, Wurz, A, Zaitsev, Y, Zavertyaev, M, Zeuner, T, Zhelezov, A, Zheng, Z, Zimmermann, R, Živko, T & Zoccoli, A 2006, 'Polarization of Λ and over(Λ, ̄) in 920 GeV fixed-target proton-nucleus collisions', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 638, no. 5-6, pp. 415-421. https://doi.org/10.1016/j.physletb.2006.05.040

TY - JOUR

T1 - Polarization of Λ and over(Λ, ̄) in 920 GeV fixed-target proton-nucleus collisions

AU - Abt, I.

AU - Adams, M.

AU - Agari, M.

AU - Albrecht, H.

AU - Aleksandrov, A.

AU - Amaral, V.

AU - Amorim, A.

AU - Aplin, S. J.

AU - Aushev, V.

AU - Bagaturia, Y.

AU - Balagura, V.

AU - Bargiotti, M.

AU - Barsukova, O.

AU - Bastos, J.

AU - Batista, J.

AU - Bauer, C.

AU - Bauer, Th S.

AU - Belkov, A.

AU - Belkov, Ar

AU - Belotelov, I.

AU - Bertin, A.

AU - Bobchenko, B.

AU - Böcker, M.

AU - Bogatyrev, A.

AU - Bohm, G.

AU - Bräuer, M.

AU - Bruinsma, M.

AU - Bruschi, M.

AU - Buchholz, P.

AU - Buran, T.

AU - Carvalho, J.

AU - Conde, P.

AU - Cruse, C.

AU - Dam, M.

AU - Danielsen, K. M.

AU - Danilov, M.

AU - De Castro, S.

AU - Deppe, H.

AU - Dong, X.

AU - Dreis, H. B.

AU - Egorytchev, V.

AU - Ehret, K.

AU - Eisele, F.

AU - Emeliyanov, D.

AU - Erhan, S.

AU - Essenov, S.

AU - Fabbri, L.

AU - Faccioli, P.

AU - Feuerstack-Raible, M.

AU - Flammer, J.

AU - Fominykh, B.

AU - Funcke, M.

AU - Garrido, Ll

AU - Gellrich, A.

AU - Giacobbe, B.

AU - Gläß, J.

AU - Goloubkov, D.

AU - Golubkov, Y.

AU - Golutvin, A.

AU - Golutvin, I.

AU - Gorbounov, I.

AU - Gorišek, A.

AU - Gouchtchine, O.

AU - Goulart, D. C.

AU - Gradl, S.

AU - Gradl, W.

AU - Grimaldi, F.

AU - Guilitsky, Yu

AU - Hansen, J. D.

AU - Hernández, J. M.

AU - Hofmann, W.

AU - Hohlmann, M.

AU - Hott, T.

AU - Hulsbergen, W.

AU - Husemann, U.

AU - Igonkina, O.

AU - Ispiryan, M.

AU - Jagla, T.

AU - Jiang, C.

AU - Kapitza, H.

AU - Karabekyan, S.

AU - Karpenko, N.

AU - Keller, S.

AU - Kessler, J.

AU - Khasanov, F.

AU - Kiryushin, Yu

AU - Kisel, I.

AU - Klinkby, E.

AU - Knöpfle, K. T.

AU - Kolanoski, H.

AU - Korpar, S.

AU - Krauss, C.

AU - Kreuzer, P.

AU - Križan, P.

AU - Krücker, D.

AU - Kupper, S.

AU - Kvaratskheliia, T.

AU - Lanyov, A.

AU - Lau, K.

AU - Lewendel, B.

AU - Lohse, T.

AU - Lomonosov, B.

AU - Männer, R.

AU - Mankel, R.

AU - Masciocchi, S.

AU - Massa, I.

AU - Matchikhilian, I.

AU - Medin, G.

AU - Medinnis, M.

AU - Mevius, M.

AU - Michetti, A.

AU - Mikhailov, Yu

AU - Mizuk, R.

AU - Muresan, R.

AU - zur Nedden, M.

AU - Negodaev, M.

AU - Nörenberg, M.

AU - Nowak, S.

AU - Núñez Pardo de Vera, M. T.

AU - Ouchrif, M.

AU - Ould-Saada, F.

AU - Padilla, C.

AU - Peralta, D.

AU - Pernack, R.

AU - Pestotnik, R.

AU - Petersen, B. AA

AU - Piccinini, M.

AU - Pleier, M. A.

AU - Poli, M.

AU - Popov, V.

AU - Pose, D.

AU - Prystupa, S.

AU - Pugatch, V.

AU - Pylypchenko, Y.

AU - Pyrlik, J.

AU - Reeves, K.

AU - Reßing, D.

AU - Rick, H.

AU - Riu, I.

AU - Robmann, P.

AU - Rostovtseva, I.

AU - Rybnikov, V.

AU - Sánchez, F.

AU - Sbrizzi, A.

AU - Schmelling, M.

AU - Schmidt, B.

AU - Schreiner, A.

AU - Schröder, H.

AU - Schwanke, U.

AU - Schwartz, A. J.

AU - Schwarz, A. S.

AU - Schwenninger, B.

AU - Schwingenheuer, B.

AU - Sciacca, F.

AU - Semprini-Cesari, N.

AU - Shuvalov, S.

AU - Silva, L.

AU - Sözüer, L.

AU - Solunin, S.

AU - Somov, A.

AU - Somov, S.

AU - Spengler, J.

AU - Spighi, R.

AU - Spiridonov, A.

AU - Stanovnik, A.

AU - Starič, M.

AU - Stegmann, C.

AU - Subramania, H. S.

AU - Symalla, M.

AU - Tikhomirov, I.

AU - Titov, M.

AU - Tsakov, I.

AU - Uwer, U.

AU - van Eldik, C.

AU - Vassiliev, Yu

AU - Villa, M.

AU - Vitale, A.

AU - Vukotic, I.

AU - Wahlberg, H.

AU - Walenta, A. H.

AU - Walter, M.

AU - Wang, J. J.

AU - Wegener, D.

AU - Werthenbach, U.

AU - Wolters, H.

AU - Wurth, R.

AU - Wurz, A.

AU - Zaitsev, Yu

AU - Zavertyaev, M.

AU - Zeuner, T.

AU - Zhelezov, A.

AU - Zheng, Z.

AU - Zimmermann, R.

AU - Živko, T.

AU - Zoccoli, A.

PY - 2006/7/20

Y1 - 2006/7/20

N2 - A measurement of the polarization of Λ and over(Λ, ̄) baryons produced in pC and pW collisions at sqrt(s) = 41.6 GeV has been performed with the HERA-B spectrometer. The measurements cover the kinematic range of 0.6 GeV / c < p⊥ < 1.2 GeV / c in transverse momentum and - 0.15 < xF < 0.01 in Feynman-x. The polarization results from the two different targets agree within the statistical error. In the combined data set, the largest deviation from zero, + 0.054 ± 0.029, is measured for xF ≲ - 0.07. Zero polarization is expected at xF = 0 in the absence of nuclear effects. The polarization results for the Λ agree with a parametrization of previous measurements which were performed at positive xF values, where the Λ polarization is negative. Results of over(Λ, ̄) polarization measurements are consistent with zero.

AB - A measurement of the polarization of Λ and over(Λ, ̄) baryons produced in pC and pW collisions at sqrt(s) = 41.6 GeV has been performed with the HERA-B spectrometer. The measurements cover the kinematic range of 0.6 GeV / c < p⊥ < 1.2 GeV / c in transverse momentum and - 0.15 < xF < 0.01 in Feynman-x. The polarization results from the two different targets agree within the statistical error. In the combined data set, the largest deviation from zero, + 0.054 ± 0.029, is measured for xF ≲ - 0.07. Zero polarization is expected at xF = 0 in the absence of nuclear effects. The polarization results for the Λ agree with a parametrization of previous measurements which were performed at positive xF values, where the Λ polarization is negative. Results of over(Λ, ̄) polarization measurements are consistent with zero.

U2 - 10.1016/j.physletb.2006.05.040

DO - 10.1016/j.physletb.2006.05.040

M3 - Article

AN - SCOPUS:33745577961

SN - 0370-2693

VL - 638

SP - 415

EP - 421

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

IS - 5-6

ER -

Polarization of Λ and over(Λ, ̄) in 920 GeV fixed-target proton-nucleus collisions

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