The polarization of Lambda baryons from Z decays is studied with the ALEPH apparatus. Evidence of longitudinal polarization of s quarks from Z decay is observed for the first time. The measured longitudinal Lambda polarization is P-L(Lambda) = -0.32 +/- 0.07 for z = p/pbeam > 0.3. This agrees with the prediction of -0.39 +/- 0.08 from the standard model and the constituent quark model, where the error is due to uncertainties in the mechanism for Lambda production. The observed Lambda polarization is diluted with respect to the primary s quark polarization by Lambda baryons without a primary s quark. Measurements of the Lambda forward-backward asymmetry and of the correlation between back-to-back Lambda<(Lambda)over bar> pairs are used to check this dilution. In addition the transverse Lambda polarization is measured. An indication of transverse polarization, more than two standard deviations away from zero, is found along the normal to the plane defined by the thrust axis and the Lambda direction.
Measurement of Lambda polarization from Z decays / Buskulic, D; Debonis, I; Decamp, D; Ghez, P; Goy, C; Lees, Jp; Lucotte, A; Minard, Mn; Odier, P; Pietrzyk, B; Chmeissani, M; Crespo, Jm; Delfino, M; Efthymiopoulos, I; Fernandez, E; Fernandezbosman, M; Garrido, L; Juste, A; Martinez, M; Orteu, S; Pacheco, A; Padilla, C; Palla, F; Pascual, A; Perlas, Ja; Riu, I; Sanchez, F; Teubert, F; Colaleo, A; Gelao, G; Girone, M; Iaselli, Giuseppe; Maggi, Giorgio Pietro; Nuzzo, S; Ranier, A; Raso, G; Romano, F; Ruggieri, E; Selvaggi, G; Silvestris, L; Tempesta, P; Zito, G; Huang, X; Lin, J; Ouyang, Q; Wang, T; Xie, Y; Xu, R; Xue, S; Zhang, J; Zhang, L; Zhao, W; Alemany, R; Bazarko, Ao; Bonvicini, G; Cattaneo, M; Comas, P; Coyle, P; Drevermann, H; Forty, Rw; Frank, M; Hagelberg, R; Harvey, J; Jacobsen, R; Jano, P; Jost, B; Kneringer, E; Knobloch, J; Lehraus, I; Martin, Eb; Mato, P; Minten, A; Miquel, R; Mir, Lm; Moneta, L; Oest, T; Palazzi, P; Pater, Jr; Pusztaszeri, Jf; Ranjard, F; Rensing, P; Rolandi, L; Schlatter, D; Schmelling, M; Schneider, O; Tejessy, W; Tomalin, Ir; Venturi, A; Wachsmuth, H; Wagner, A; Wildish, T; Witzeling, W; Wotschack, J; Ajaltouni, Z; Barres, A; Boyer, C; Falvard, A; Gay, P; Guicheney, C; Henrard, P; Jousset, J; Michel, B; Monteil, S; Montret, Jc; Pallin, D; Perret, P; Podlyski, F; Proriol, J; Rossignol, Jm; Fearnley, T; Hansen, Jb; Hansen, Jd; Hansen, Jr; Hansen, Ph; Nilsson, Bs; Waananen, A; Kyriakis, A; Markou, C; Simopoulou, E; Siotis, I; Vayaki, A; Zachariadou, K; Blondel, A; Bonneaud, G; Brient, Jc; Bourdon, P; Rouge, A; Rumpf, M; Tanaka, R; Valassi, A; Verderi, M; Videau, H; Candlin, Dj; Parsons, Mi; Focardi, E; Parrini, G; Corden, M; Georgiopoulos, C; Jaffe, De; Antonelli, A; Bencivenni, G; Bologna, G; Bossi, F; Campana, F; Capon, G; Casper, D; Chiarella, V; Felici, G; Laurelli, P; Mannocchi, G; Murtas, F; Murtas, Gp; Passalacqua, L; Pepealtarelli, M; Curtis, L; Dorris, Sj; Halley, Aw; Knowles, Ig; Lynch, Jg; Oshea, V; Raine, C; Reeves, P; Scarr, Jm; Smith, K; Thompson, As; Thomas, F; Thorn, S; Turnbull, Rm; Becker, U; Geweniger, C; Graefe, G; Hanke, P; Hansper, G; Hepp, V; Kluge, Ee; Putzer, A; Rensch, B; Schmidt, M; Sommer, J; Stenzel, H; Tittel, K; Werner, S; Wunsch, M; Abbaneo, D; Beuselinck, R; Binnie, Dm; Cameron, W; Dornan, Pj; Moutoussi, A; Nash, J; Sedgbeer, Jk; Stacey, Am; Williams, Md; Dissertori, G; Girtler, P; Kuhn, D; Rudolph, G; Bowdery, Ck; Brodbeck, Tj; Colrain, P; Crawford, G; Finch, Aj; Foster, F; Hughes, G; Sloan, T; Whelan, Ep; Williams, Mi; Galla, A; Greene, Am; Kleinknecht, K; Quast, G; Renk, B; Rohne, E; Sander, Hg; Vangemmeren, P; Zeitnitz, C; Aubert, Jj; Bencheikh, Am; Benchouk, C; Bonissent, A; Bujosa, G; Calvet, D; Carr, J; Diaconu, C; Etienne, E; Konstantinidis, N; Nicod, D; Payre, P; Rousseau, D; Talby, M; Sadouki, A; Thulasidas, M; Trabelsi, K; Abt, I; Assmann, R; Bauer, C; Blum, W; Dietl, H; Dydak, F; Ganis, G; Gotzhein, C; Jakobs, K; Kroha, H; Lutjens, G; Lutz, G; Manner, W; Moser, Hg; Richter, R; Rosadoschlosser, A; Schael, S; Settles, R; Seywerd, H; Stdenis, R; Wiedenmann, W; Wolf, G; Boucrot, J; Callot, O; Cordier, A; Davier, M; Duflot, L; Grivaz, Jf; Heusse, P; Jacquet, M; Kimfn, Dw; Lediberder, F; Lefrancois, J; Lutz, Am; Nikolic, I; Park, Hj; Park, Ic; Schune, Mh; Simion, S; Veillet, Jj; Videau, I; Azzurri, P; Bagliesi, G; Batignani, G; Bettarini, S; Bozzi, C; Calderini, G; Carpinelli, M; Ciocci, Ma; Ciulli, V; Dellorso, R; Fantechi, R; Ferrante, I; Foa, L; Forti, F; Giassi, A; Giorgi, Ma; Gregorio, A; Ligabue, F; Lusiani, A; Marrocchesi, Ps; Messineo, A; Rizzo, G; Sanguinetti, G; Sciaba, A; Spagnolo, P; Steinberger, J; Tenchini, R; Tonelli, G; Vannini, C; Verdini, Pg; Walsh, J; Betteridge, Ap; Blair, Ga; Bryant, Lm; Cerutti, F; Chambers, Jt; Gao, Y; Green, Mg; Johnson, Dl; Medcalf, T; Perrodo, P; Strong, Ja; Vonwimmerspergtoeller, Jh; Botterill, Dr; Clifft, Rw; Edgecock, Tr; Haywood, S; Maley, P; Norton, Pr; Thompson, Jc; Wright, Ae; Blochdevaux, B; Colas, P; Emery, S; Kozanecki, W; Lancon, E; Lemaire, Mc; Locci, E; Marx, B; Perez, P; Rander, J; Renardy, Jf; Roussarie, A; Schuller, Jp; Schwindling, J; Trabelsi, A; Vallage, B; Johnson, Rp; Kim, Hy; Litke, Am; Mcneil, Ma; Taylor, G; Beddall, A; Booth, Cn; Boswell, R; Brew, Caj; Cartwright, S; Combley, F; Koksal, A; Letho, M; Newton, Wm; Rankin, C; Reeve, J; Thompson, Lf; Bohrer, A; Brandt, S; Buscher, V; Cowan, G; Grupen, C; Lutters, G; Minguetrodriguez, J; Rivera, F; Saraiva, P; Smolik, L; Stephan, F; Aleppo, M; Apollonio, M; Bosisio, L; Dellamarina, R; Giannini, G; Gobbo, B; Musolino, G; Ragusa, F; Rothberg, J; Wasserbaech, S; Armstrong, Sr; Bellantoni, L; Elmer, P; Feng, Z; Ferguson, Dps; Gao, Ys; Gonzalez, S; Grahl, J; Greening, Tc; Harton, Jl; Hayes, Oj; H, Hu; Mcnamara, Pa; Nachtmana, Jm; Orejudos, W; Pan, Yb; Saadi, Y; Schmitt, M; Scott, Ij; Sharma, V; Turk, Jd; Walsh, Am; Wu, Sl; Wu, X; Yamartino, Jm; Zheng, M; Zobernig, G.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 374:4(1996), pp. 319-330. [10.1016/0370-2693(96)00300-0]
Measurement of Lambda polarization from Z decays
Buskulic D; DeBonis I; Decamp D; Ghez P; Goy C; Lees JP; Lucotte A; Minard MN; Odier P; Pietrzyk B; Chmeissani M; Crespo JM; Delfino M; Efthymiopoulos I; Fernandez E; FernandezBosman M; Garrido L; Juste A; Martinez M; Orteu S; Pacheco A; Padilla C; Palla F; Pascual A; Perlas JA; Riu I; Sanchez F; Teubert F; Colaleo A; Gelao G; Girone M; IASELLI, Giuseppe ;MAGGI, Giorgio Pietro ;Nuzzo S; Ranier A; Raso G; Romano F; Ruggieri E; Selvaggi G; Silvestris L; Tempesta P; Zito G; Huang X; Lin J; Ouyang Q; Wang T; Xie Y; Xu R; Xue S; Zhang J; Zhang L; Zhao W; Alemany R; Bazarko AO; Bonvicini G; Cattaneo M; Comas P; Coyle P; Drevermann H; Forty RW; Frank M; Hagelberg R; Harvey J; Jacobsen R; Jano P; Jost B; Kneringer E; Knobloch J; Lehraus I; Martin EB; Mato P; Minten A; Miquel R; Mir LM; Moneta L; Oest T; Palazzi P; Pater JR; Pusztaszeri JF; Ranjard F; Rensing P; Rolandi L; Schlatter D; Schmelling M; Schneider O; Tejessy W; Tomalin IR; Venturi A; Wachsmuth H; Wagner A; Wildish T; Witzeling W; Wotschack J; Ajaltouni Z; Barres A; Boyer C; Falvard A; Gay P; Guicheney C; Henrard P; Jousset J; Michel B; Monteil S; Montret JC; Pallin D; Perret P; Podlyski F; Proriol J; Rossignol JM; Fearnley T; Hansen JB; Hansen JD; Hansen JR; Hansen PH; Nilsson BS; Waananen A; Kyriakis A; Markou C; Simopoulou E; Siotis I; Vayaki A; Zachariadou K; Blondel A; Bonneaud G; Brient JC; Bourdon P; Rouge A; Rumpf M; Tanaka R; Valassi A; Verderi M; Videau H; Candlin DJ; Parsons MI; Focardi E; Parrini G; Corden M; Georgiopoulos C; Jaffe DE; Antonelli A; Bencivenni G; Bologna G; Bossi F; Campana F; Capon G; Casper D; Chiarella V; Felici G; Laurelli P; Mannocchi G; Murtas F; Murtas GP; Passalacqua L; PepeAltarelli M; Curtis L; Dorris SJ; Halley AW; Knowles IG; Lynch JG; OShea V; Raine C; Reeves P; Scarr JM; Smith K; Thompson AS; Thomas F; Thorn S; Turnbull RM; Becker U; Geweniger C; Graefe G; Hanke P; Hansper G; Hepp V; Kluge EE; Putzer A; Rensch B; Schmidt M; Sommer J; Stenzel H; Tittel K; Werner S; Wunsch M; Abbaneo D; Beuselinck R; Binnie DM; Cameron W; Dornan PJ; Moutoussi A; Nash J; Sedgbeer JK; Stacey AM; Williams MD; Dissertori G; Girtler P; Kuhn D; Rudolph G; Bowdery CK; Brodbeck TJ; Colrain P; Crawford G; Finch AJ; Foster F; Hughes G; Sloan T; Whelan EP; Williams MI; Galla A; Greene AM; Kleinknecht K; Quast G; Renk B; Rohne E; Sander HG; vanGemmeren P; Zeitnitz C; Aubert JJ; Bencheikh AM; Benchouk C; Bonissent A; Bujosa G; Calvet D; Carr J; Diaconu C; Etienne E; Konstantinidis N; Nicod D; Payre P; Rousseau D; Talby M; Sadouki A; Thulasidas M; Trabelsi K; Abt I; Assmann R; Bauer C; Blum W; Dietl H; Dydak F; Ganis G; Gotzhein C; Jakobs K; Kroha H; Lutjens G; Lutz G; Manner W; Moser HG; Richter R; RosadoSchlosser A; Schael S; Settles R; Seywerd H; StDenis R; Wiedenmann W; Wolf G; Boucrot J; Callot O; Cordier A; Davier M; Duflot L; Grivaz JF; Heusse P; Jacquet M; Kimfn DW; LeDiberder F; Lefrancois J; Lutz AM; Nikolic I; Park HJ; Park IC; Schune MH; Simion S; Veillet JJ; Videau I; Azzurri P; Bagliesi G; Batignani G; Bettarini S; Bozzi C; Calderini G; Carpinelli M; Ciocci MA; Ciulli V; DellOrso R; Fantechi R; Ferrante I; Foa L; Forti F; Giassi A; Giorgi MA; Gregorio A; Ligabue F; Lusiani A; Marrocchesi PS; Messineo A; Rizzo G; Sanguinetti G; Sciaba A; Spagnolo P; Steinberger J; Tenchini R; Tonelli G; Vannini C; Verdini PG; Walsh J; Betteridge AP; Blair GA; Bryant LM; Cerutti F; Chambers JT; Gao Y; Green MG; Johnson DL; Medcalf T; Perrodo P; Strong JA; vonWimmerspergToeller JH; Botterill DR; Clifft RW; Edgecock TR; Haywood S; Maley P; Norton PR; Thompson JC; Wright AE; BlochDevaux B; Colas P; Emery S; Kozanecki W; Lancon E; Lemaire MC; Locci E; Marx B; Perez P; Rander J; Renardy JF; Roussarie A; Schuller JP; Schwindling J; Trabelsi A; Vallage B; Johnson RP; Kim HY; Litke AM; McNeil MA; Taylor G; Beddall A; Booth CN; Boswell R; Brew CAJ; Cartwright S; Combley F; Koksal A; Letho M; Newton WM; Rankin C; Reeve J; Thompson LF; Bohrer A; Brandt S; Buscher V; Cowan G; Grupen C; Lutters G; Minguetrodriguez J; Rivera F; Saraiva P; Smolik L; Stephan F; Aleppo M; Apollonio M; Bosisio L; DellaMarina R; Giannini G; Gobbo B; Musolino G; Ragusa F; Rothberg J; Wasserbaech S; Armstrong SR; Bellantoni L; Elmer P; Feng Z; Ferguson DPS; Gao YS; Gonzalez S; Grahl J; Greening TC; Harton JL; Hayes OJ; Hu H; McNamara PA; Nachtmana JM; Orejudos W; Pan YB; Saadi Y; Schmitt M; Scott IJ; Sharma V; Turk JD; Walsh AM; Wu SL; Wu X; Yamartino JM; Zheng M; Zobernig G.
1996-01-01
Abstract
The polarization of Lambda baryons from Z decays is studied with the ALEPH apparatus. Evidence of longitudinal polarization of s quarks from Z decay is observed for the first time. The measured longitudinal Lambda polarization is P-L(Lambda) = -0.32 +/- 0.07 for z = p/pbeam > 0.3. This agrees with the prediction of -0.39 +/- 0.08 from the standard model and the constituent quark model, where the error is due to uncertainties in the mechanism for Lambda production. The observed Lambda polarization is diluted with respect to the primary s quark polarization by Lambda baryons without a primary s quark. Measurements of the Lambda forward-backward asymmetry and of the correlation between back-to-back Lambda<(Lambda)over bar> pairs are used to check this dilution. In addition the transverse Lambda polarization is measured. An indication of transverse polarization, more than two standard deviations away from zero, is found along the normal to the plane defined by the thrust axis and the Lambda direction.
Citazione
Measurement of Lambda polarization from Z decays / Buskulic, D; Debonis, I; Decamp, D; Ghez, P; Goy, C; Lees, Jp; Lucotte, A; Minard, Mn; Odier, P; Pietrzyk, B; Chmeissani, M; Crespo, Jm; Delfino, M; Efthymiopoulos, I; Fernandez, E; Fernandezbosman, M; Garrido, L; Juste, A; Martinez, M; Orteu, S; Pacheco, A; Padilla, C; Palla, F; Pascual, A; Perlas, Ja; Riu, I; Sanchez, F; Teubert, F; Colaleo, A; Gelao, G; Girone, M; Iaselli, Giuseppe; Maggi, Giorgio Pietro; Nuzzo, S; Ranier, A; Raso, G; Romano, F; Ruggieri, E; Selvaggi, G; Silvestris, L; Tempesta, P; Zito, G; Huang, X; Lin, J; Ouyang, Q; Wang, T; Xie, Y; Xu, R; Xue, S; Zhang, J; Zhang, L; Zhao, W; Alemany, R; Bazarko, Ao; Bonvicini, G; Cattaneo, M; Comas, P; Coyle, P; Drevermann, H; Forty, Rw; Frank, M; Hagelberg, R; Harvey, J; Jacobsen, R; Jano, P; Jost, B; Kneringer, E; Knobloch, J; Lehraus, I; Martin, Eb; Mato, P; Minten, A; Miquel, R; Mir, Lm; Moneta, L; Oest, T; Palazzi, P; Pater, Jr; Pusztaszeri, Jf; Ranjard, F; Rensing, P; Rolandi, L; Schlatter, D; Schmelling, M; Schneider, O; Tejessy, W; Tomalin, Ir; Venturi, A; Wachsmuth, H; Wagner, A; Wildish, T; Witzeling, W; Wotschack, J; Ajaltouni, Z; Barres, A; Boyer, C; Falvard, A; Gay, P; Guicheney, C; Henrard, P; Jousset, J; Michel, B; Monteil, S; Montret, Jc; Pallin, D; Perret, P; Podlyski, F; Proriol, J; Rossignol, Jm; Fearnley, T; Hansen, Jb; Hansen, Jd; Hansen, Jr; Hansen, Ph; Nilsson, Bs; Waananen, A; Kyriakis, A; Markou, C; Simopoulou, E; Siotis, I; Vayaki, A; Zachariadou, K; Blondel, A; Bonneaud, G; Brient, Jc; Bourdon, P; Rouge, A; Rumpf, M; Tanaka, R; Valassi, A; Verderi, M; Videau, H; Candlin, Dj; Parsons, Mi; Focardi, E; Parrini, G; Corden, M; Georgiopoulos, C; Jaffe, De; Antonelli, A; Bencivenni, G; Bologna, G; Bossi, F; Campana, F; Capon, G; Casper, D; Chiarella, V; Felici, G; Laurelli, P; Mannocchi, G; Murtas, F; Murtas, Gp; Passalacqua, L; Pepealtarelli, M; Curtis, L; Dorris, Sj; Halley, Aw; Knowles, Ig; Lynch, Jg; Oshea, V; Raine, C; Reeves, P; Scarr, Jm; Smith, K; Thompson, As; Thomas, F; Thorn, S; Turnbull, Rm; Becker, U; Geweniger, C; Graefe, G; Hanke, P; Hansper, G; Hepp, V; Kluge, Ee; Putzer, A; Rensch, B; Schmidt, M; Sommer, J; Stenzel, H; Tittel, K; Werner, S; Wunsch, M; Abbaneo, D; Beuselinck, R; Binnie, Dm; Cameron, W; Dornan, Pj; Moutoussi, A; Nash, J; Sedgbeer, Jk; Stacey, Am; Williams, Md; Dissertori, G; Girtler, P; Kuhn, D; Rudolph, G; Bowdery, Ck; Brodbeck, Tj; Colrain, P; Crawford, G; Finch, Aj; Foster, F; Hughes, G; Sloan, T; Whelan, Ep; Williams, Mi; Galla, A; Greene, Am; Kleinknecht, K; Quast, G; Renk, B; Rohne, E; Sander, Hg; Vangemmeren, P; Zeitnitz, C; Aubert, Jj; Bencheikh, Am; Benchouk, C; Bonissent, A; Bujosa, G; Calvet, D; Carr, J; Diaconu, C; Etienne, E; Konstantinidis, N; Nicod, D; Payre, P; Rousseau, D; Talby, M; Sadouki, A; Thulasidas, M; Trabelsi, K; Abt, I; Assmann, R; Bauer, C; Blum, W; Dietl, H; Dydak, F; Ganis, G; Gotzhein, C; Jakobs, K; Kroha, H; Lutjens, G; Lutz, G; Manner, W; Moser, Hg; Richter, R; Rosadoschlosser, A; Schael, S; Settles, R; Seywerd, H; Stdenis, R; Wiedenmann, W; Wolf, G; Boucrot, J; Callot, O; Cordier, A; Davier, M; Duflot, L; Grivaz, Jf; Heusse, P; Jacquet, M; Kimfn, Dw; Lediberder, F; Lefrancois, J; Lutz, Am; Nikolic, I; Park, Hj; Park, Ic; Schune, Mh; Simion, S; Veillet, Jj; Videau, I; Azzurri, P; Bagliesi, G; Batignani, G; Bettarini, S; Bozzi, C; Calderini, G; Carpinelli, M; Ciocci, Ma; Ciulli, V; Dellorso, R; Fantechi, R; Ferrante, I; Foa, L; Forti, F; Giassi, A; Giorgi, Ma; Gregorio, A; Ligabue, F; Lusiani, A; Marrocchesi, Ps; Messineo, A; Rizzo, G; Sanguinetti, G; Sciaba, A; Spagnolo, P; Steinberger, J; Tenchini, R; Tonelli, G; Vannini, C; Verdini, Pg; Walsh, J; Betteridge, Ap; Blair, Ga; Bryant, Lm; Cerutti, F; Chambers, Jt; Gao, Y; Green, Mg; Johnson, Dl; Medcalf, T; Perrodo, P; Strong, Ja; Vonwimmerspergtoeller, Jh; Botterill, Dr; Clifft, Rw; Edgecock, Tr; Haywood, S; Maley, P; Norton, Pr; Thompson, Jc; Wright, Ae; Blochdevaux, B; Colas, P; Emery, S; Kozanecki, W; Lancon, E; Lemaire, Mc; Locci, E; Marx, B; Perez, P; Rander, J; Renardy, Jf; Roussarie, A; Schuller, Jp; Schwindling, J; Trabelsi, A; Vallage, B; Johnson, Rp; Kim, Hy; Litke, Am; Mcneil, Ma; Taylor, G; Beddall, A; Booth, Cn; Boswell, R; Brew, Caj; Cartwright, S; Combley, F; Koksal, A; Letho, M; Newton, Wm; Rankin, C; Reeve, J; Thompson, Lf; Bohrer, A; Brandt, S; Buscher, V; Cowan, G; Grupen, C; Lutters, G; Minguetrodriguez, J; Rivera, F; Saraiva, P; Smolik, L; Stephan, F; Aleppo, M; Apollonio, M; Bosisio, L; Dellamarina, R; Giannini, G; Gobbo, B; Musolino, G; Ragusa, F; Rothberg, J; Wasserbaech, S; Armstrong, Sr; Bellantoni, L; Elmer, P; Feng, Z; Ferguson, Dps; Gao, Ys; Gonzalez, S; Grahl, J; Greening, Tc; Harton, Jl; Hayes, Oj; H, Hu; Mcnamara, Pa; Nachtmana, Jm; Orejudos, W; Pan, Yb; Saadi, Y; Schmitt, M; Scott, Ij; Sharma, V; Turk, Jd; Walsh, Am; Wu, Sl; Wu, X; Yamartino, Jm; Zheng, M; Zobernig, G.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 374:4(1996), pp. 319-330. [10.1016/0370-2693(96)00300-0]
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