A measurement of Λ polarization in inclusive production by Σ- of 340 GeV/c in C and Cu targets

M. I. Adamovich; Yu A. Alexandrov; S. P. Baranov; D. Barberis; M. Beck; C. Bérat; W. Beusch; M. Boss; S. Brons; W. Brückner; M. Buénerd; Ch Busch; Ch Büscher; F. Charignon; J. Chauvin; E. A. Chudakov; U. Dersch; F. Dropmann; J. Engelfried; F. Faller; A. Fournier; S. G. Gerassimov; M. Godbersen; P. Grafström; Th Haller; M. Heidrich; E. Hubbard; R. B. Hurst; K. Königsmann; I. Konorov; N. Keller; K. Martens; Ph Martin; S. Masciocchi; R. Michaels; U. Müller; H. Neeb; D. Newbold; C. Newsom; S. Paul; J. Pochodzalla; I. Potashnikova; B. Povh; R. Ransome; Z. Ren; M. Rey-Campagnolle; G. Rosner; L. Rossi; H. Rudolph; C. Scheel; L. Schmitt; H. W. Siebert; A. Simon; V. Smith; O. Thilmann; A. Trombini; E. Vesin; B. Volkemer; K. Vorwalter; Th Walcher; G. Wälder; R. Werding; E. Wittmann; M. V. Zavertyaev

doi:10.1140/epjc/s2003-01357-3

A measurement of Λ polarization in inclusive production by Σ^- of 340 GeV/c in C and Cu targets

M. I. Adamovich, Yu A. Alexandrov, S. P. Baranov, D. Barberis, M. Beck, C. Bérat, W. Beusch, M. Boss, S. Brons, W. Brückner, M. Buénerd, Ch Busch, Ch Büscher, F. Charignon, J. Chauvin, E. A. Chudakov, U. Dersch, F. Dropmann, J. Engelfried, F. FallerA. Fournier, S. G. Gerassimov, M. Godbersen, P. Grafström, Th Haller, M. Heidrich, E. Hubbard, R. B. Hurst, K. Königsmann, I. Konorov, N. Keller, K. Martens, Ph Martin, S. Masciocchi, R. Michaels, U. Müller, H. Neeb, D. Newbold, C. Newsom, S. Paul, J. Pochodzalla, I. Potashnikova, B. Povh, R. Ransome, Z. Ren, M. Rey-Campagnolle, G. Rosner, L. Rossi, H. Rudolph, C. Scheel, L. Schmitt, H. W. Siebert, A. Simon, V. Smith, O. Thilmann, A. Trombini, E. Vesin, B. Volkemer, K. Vorwalter, Th Walcher, G. Wälder, R. Werding, E. Wittmann, M. V. Zavertyaev

Chair of Physics I

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Abstract

We have measured the polarization of Λ hyperons produced inclusively by a Σ^- beam of 340 GeV/c momentum in nuclear targets. From a sample of 9.5 millions of identified Λ decays, polarizations were determined in the range x_F > 0.1 and p _t < 1.6 GeV/c. The polarization w.r.t. the production normal is mainly positive for x_F ≥ 0.3. At fixed values of x_F, it increases with p_t to a maximum between p_t=0.5 and p_t=1 GeV/c, and then decreases to zero or even negative values, in sharp contrast to the plateau above p_t=1 GeV/c observed in inclusive A production by protons.

Original language	English
Pages (from-to)	221-228
Number of pages	8
Journal	European Physical Journal C
Volume	32
Issue number	2
DOIs	https://doi.org/10.1140/epjc/s2003-01357-3
State	Published - Jan 2004

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Adamovich, M. I., Alexandrov, Y. A., Baranov, S. P., Barberis, D., Beck, M., Bérat, C., Beusch, W., Boss, M., Brons, S., Brückner, W., Buénerd, M., Busch, C., Büscher, C., Charignon, F., Chauvin, J., Chudakov, E. A., Dersch, U., Dropmann, F., Engelfried, J., ... Zavertyaev, M. V. (2004). A measurement of Λ polarization in inclusive production by Σ^- of 340 GeV/c in C and Cu targets. European Physical Journal C, 32(2), 221-228. https://doi.org/10.1140/epjc/s2003-01357-3

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abstract = "We have measured the polarization of Λ hyperons produced inclusively by a Σ- beam of 340 GeV/c momentum in nuclear targets. From a sample of 9.5 millions of identified Λ decays, polarizations were determined in the range xF > 0.1 and p t < 1.6 GeV/c. The polarization w.r.t. the production normal is mainly positive for xF ≥ 0.3. At fixed values of xF, it increases with pt to a maximum between pt=0.5 and pt=1 GeV/c, and then decreases to zero or even negative values, in sharp contrast to the plateau above pt=1 GeV/c observed in inclusive A production by protons.",

author = "Adamovich, {M. I.} and Alexandrov, {Yu A.} and Baranov, {S. P.} and D. Barberis and M. Beck and C. B{\'e}rat and W. Beusch and M. Boss and S. Brons and W. Br{\"u}ckner and M. Bu{\'e}nerd and Ch Busch and Ch B{\"u}scher and F. Charignon and J. Chauvin and Chudakov, {E. A.} and U. Dersch and F. Dropmann and J. Engelfried and F. Faller and A. Fournier and Gerassimov, {S. G.} and M. Godbersen and P. Grafstr{\"o}m and Th Haller and M. Heidrich and E. Hubbard and Hurst, {R. B.} and K. K{\"o}nigsmann and I. Konorov and N. Keller and K. Martens and Ph Martin and S. Masciocchi and R. Michaels and U. M{\"u}ller and H. Neeb and D. Newbold and C. Newsom and S. Paul and J. Pochodzalla and I. Potashnikova and B. Povh and R. Ransome and Z. Ren and M. Rey-Campagnolle and G. Rosner and L. Rossi and H. Rudolph and C. Scheel and L. Schmitt and Siebert, {H. W.} and A. Simon and V. Smith and O. Thilmann and A. Trombini and E. Vesin and B. Volkemer and K. Vorwalter and Th Walcher and G. W{\"a}lder and R. Werding and E. Wittmann and Zavertyaev, {M. V.}",

year = "2004",

month = jan,

doi = "10.1140/epjc/s2003-01357-3",

language = "English",

volume = "32",

pages = "221--228",

journal = "European Physical Journal C",

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Adamovich, MI, Alexandrov, YA, Baranov, SP, Barberis, D, Beck, M, Bérat, C, Beusch, W, Boss, M, Brons, S, Brückner, W, Buénerd, M, Busch, C, Büscher, C, Charignon, F, Chauvin, J, Chudakov, EA, Dersch, U, Dropmann, F, Engelfried, J, Faller, F, Fournier, A, Gerassimov, SG, Godbersen, M, Grafström, P, Haller, T, Heidrich, M, Hubbard, E, Hurst, RB, Königsmann, K, Konorov, I, Keller, N, Martens, K, Martin, P, Masciocchi, S, Michaels, R, Müller, U, Neeb, H, Newbold, D, Newsom, C, Paul, S, Pochodzalla, J, Potashnikova, I, Povh, B, Ransome, R, Ren, Z, Rey-Campagnolle, M, Rosner, G, Rossi, L, Rudolph, H, Scheel, C, Schmitt, L, Siebert, HW, Simon, A, Smith, V, Thilmann, O, Trombini, A, Vesin, E, Volkemer, B, Vorwalter, K, Walcher, T, Wälder, G, Werding, R, Wittmann, E & Zavertyaev, MV 2004, 'A measurement of Λ polarization in inclusive production by Σ^- of 340 GeV/c in C and Cu targets', European Physical Journal C, vol. 32, no. 2, pp. 221-228. https://doi.org/10.1140/epjc/s2003-01357-3

TY - JOUR

T1 - A measurement of Λ polarization in inclusive production by Σ- of 340 GeV/c in C and Cu targets

AU - Adamovich, M. I.

AU - Alexandrov, Yu A.

AU - Baranov, S. P.

AU - Barberis, D.

AU - Beck, M.

AU - Bérat, C.

AU - Beusch, W.

AU - Boss, M.

AU - Brons, S.

AU - Brückner, W.

AU - Buénerd, M.

AU - Busch, Ch

AU - Büscher, Ch

AU - Charignon, F.

AU - Chauvin, J.

AU - Chudakov, E. A.

AU - Dersch, U.

AU - Dropmann, F.

AU - Engelfried, J.

AU - Faller, F.

AU - Fournier, A.

AU - Gerassimov, S. G.

AU - Godbersen, M.

AU - Grafström, P.

AU - Haller, Th

AU - Heidrich, M.

AU - Hubbard, E.

AU - Hurst, R. B.

AU - Königsmann, K.

AU - Konorov, I.

AU - Keller, N.

AU - Martens, K.

AU - Martin, Ph

AU - Masciocchi, S.

AU - Michaels, R.

AU - Müller, U.

AU - Neeb, H.

AU - Newbold, D.

AU - Newsom, C.

AU - Paul, S.

AU - Pochodzalla, J.

AU - Potashnikova, I.

AU - Povh, B.

AU - Ransome, R.

AU - Ren, Z.

AU - Rey-Campagnolle, M.

AU - Rosner, G.

AU - Rossi, L.

AU - Rudolph, H.

AU - Scheel, C.

AU - Schmitt, L.

AU - Siebert, H. W.

AU - Simon, A.

AU - Smith, V.

AU - Thilmann, O.

AU - Trombini, A.

AU - Vesin, E.

AU - Volkemer, B.

AU - Vorwalter, K.

AU - Walcher, Th

AU - Wälder, G.

AU - Werding, R.

AU - Wittmann, E.

AU - Zavertyaev, M. V.

PY - 2004/1

Y1 - 2004/1

N2 - We have measured the polarization of Λ hyperons produced inclusively by a Σ- beam of 340 GeV/c momentum in nuclear targets. From a sample of 9.5 millions of identified Λ decays, polarizations were determined in the range xF > 0.1 and p t < 1.6 GeV/c. The polarization w.r.t. the production normal is mainly positive for xF ≥ 0.3. At fixed values of xF, it increases with pt to a maximum between pt=0.5 and pt=1 GeV/c, and then decreases to zero or even negative values, in sharp contrast to the plateau above pt=1 GeV/c observed in inclusive A production by protons.

AB - We have measured the polarization of Λ hyperons produced inclusively by a Σ- beam of 340 GeV/c momentum in nuclear targets. From a sample of 9.5 millions of identified Λ decays, polarizations were determined in the range xF > 0.1 and p t < 1.6 GeV/c. The polarization w.r.t. the production normal is mainly positive for xF ≥ 0.3. At fixed values of xF, it increases with pt to a maximum between pt=0.5 and pt=1 GeV/c, and then decreases to zero or even negative values, in sharp contrast to the plateau above pt=1 GeV/c observed in inclusive A production by protons.

UR - http://www.scopus.com/inward/record.url?scp=2442475606&partnerID=8YFLogxK

U2 - 10.1140/epjc/s2003-01357-3

DO - 10.1140/epjc/s2003-01357-3

M3 - Article

AN - SCOPUS:2442475606

SN - 1434-6044

VL - 32

SP - 221

EP - 228

JO - European Physical Journal C

JF - European Physical Journal C

IS - 2

ER -

A measurement of Λ polarization in inclusive production by Σ^- of 340 GeV/c in C and Cu targets

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