Measurement of the transverse polarization of $\Lambda$ and $\bar{\Lambda}$ hyperons produced in proton--proton collisions at $\sqrt{s}=7$ TeV using the ATLAS detector

G. Aad 1 S. Albrand 2 J. Brown 2 J. Collot 2 S. Crépé-Renaudin 2 B. Dechenaux 2 P.A. Delsart 2 C. Gabaldon 2 M.H. Genest 2 J.Y. Hostachy 2 F. Ledroit-Guillon 2 A. Lleres 2 A. Lucotte 2 F. Malek 2 C. Monini 2 J. Stark 2 B. Trocmé 2 M. Wu 2 G. Rahal 3 Z. Barnovska 4 N. Berger 4 M. Delmastro 4 L. Di Ciaccio 4 S. Elles 4 C. Goy 4 T. Hryn’ova 4 S. Jézéquel 4 H. Keoshkerian 4 I. Koletsou 4 R. Lafaye 4 J. Leveque 4 N. Massol 4 H. Przysiezniak 4 G. Sauvage 4 E. Sauvan 4, 1 M. Schwoerer 4 O. Simard 4 T. Todorov 4 I. Wingerter-Seez 4 S. Abdel Khalek 5 A. Bassalat 5 C. Becot 5 S. Binet 5 C. Bourdarios 5 D. Charfeddine 5 J.B. de Vivie De Regie 5 L. Duflot 5 M. Escalier 5 L. Fayard 5 D. Fournier 5 J.-F. Grivaz 5 T. Guillemin 5 F. Hariri 5 S. Henrot-Versillé 5 J. Hrivnac 5 L. Iconomidou-Fayard 5 M. Kado 5 A. Lounis 5 N. Makovec 5 L. Poggioli 5 P. Puzo 5 A. Renaud 5 D. Rousseau 5 G. Rybkin 5 A.C. Schaffer 5 E. Scifo 5 L. Serin 5 S. Simion 5 R. Tanaka 5 H.L. Tran 5 D. Zerwas 5 Zhen Zhang 5 L. Alio 1 M. Barbero 1 J. C. Clémens Y. Coadou 1 S. Diglio 1 F. Djama 1 L. Feligioni 1 G.D. Hallewell 1 D. Hoffmann 1 F. Hubaut 1 E. B. F. G. Knoops 1 E. Le Guirriec 1 B. Li 1 D. Madaffari 1 K. Mochizuki 1 E. Monnier 1 S. Muanza 1 Y. Nagai 1 P. Pralavorio 1 A. Rozanov 1 T. Serre 1 M. Talby 1 E. Tiouchichine 1 S. Tisserant 1 J. Toth 1 F. Touchard 1 M. Ughetto 6, 1 L. Vacavant 1 D. Boumediene 7 Emmanuel Busato 7 D. Calvet 7 S. Calvet 7 J. Donini 7 E. Dubreuil 7 N. Ghodbane 7 G. Gilles 7 Ph. Gris 7 C. Guicheney 7 H. Liao 7 D. Pallin 7 F. Podlyski 7 C. Santoni 7 D. Simon 7 Timothée Theveneaux-Pelzer 7 Loïc Valery 7 F. Vazeille 7
Abstract : The transverse polarization of $\Lambda$ and $\bar\Lambda$ hyperons produced in proton-proton collisions at a center-of-mass energy of 7 TeV is measured. The analysis uses 760 $\mu$b$^{-1}$ of minimum bias data collected by the ATLAS detector at the LHC in the year 2010. The measured transverse polarization averaged over Feynman $x_{\rm F}$ from $5\times 10^{-5}$ to 0.01 and transverse momentum $p_{\rm T}$ from 0.8 to 15 GeV is $-0.010 \pm 0.005({\rm stat}) \pm 0.004({\rm syst})$ for $\Lambda$ and $0.002 \pm 0.006({\rm stat}) \pm 0.004({\rm syst})$ for $\bar\Lambda$. It is also measured as a function of $x_{\rm F}$ and $p_{\rm T}$, but no significant dependence on these variables is observed. Prior to this measurement, the polarization was measured at fixed-target experiments with center-of-mass energies up to about 40 GeV. The ATLAS results are compatible with the extrapolation of a fit from previous measurements to the $x_{\rm F}$ range covered by this mesurement.
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Physical Review D, American Physical Society, 2015, 91, pp.032004. 〈10.1103/PhysRevD.91.032004〉
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Dernière modification le : mardi 13 février 2018 - 13:28:06

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G. Aad, S. Albrand, J. Brown, J. Collot, S. Crépé-Renaudin, et al.. Measurement of the transverse polarization of $\Lambda$ and $\bar{\Lambda}$ hyperons produced in proton--proton collisions at $\sqrt{s}=7$ TeV using the ATLAS detector. Physical Review D, American Physical Society, 2015, 91, pp.032004. 〈10.1103/PhysRevD.91.032004〉. 〈in2p3-01091281〉

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