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Measurement of neutral strange particle production in the underlying event in proton-proton collisions at sqrt(s) = 7 TeV

S. Chatrchyan M. Besançon 1 S. Choudhury 1 F. Couderc 1 M. Dejardin 1 D. Denegri 1 B. Fabbro 1 J.L. Faure 1 F. Ferri 1 S. Ganjour 1 A. Givernaud 1 P. Gras 1 G. Hamel de Monchenault 1 P. Jarry 1 E. Locci 1 J. Malcles 1 L. Millischer 1 A. Nayak 1 J. Rander 1 A. Rosowsky 1 M. Titov 1 S. Baffioni 2 F. Beaudette 2 L. Benhabib 2 L. Bianchini 2 M. Bluj 2 Pierre Busson 2 C. Charlot 2 N. Daci 2 T. Dahms 2 M. Dalchenko 2 L. Dobrzynski 2 A. Florent 2 R. Granier de Cassagnac 2 M. Haguenauer 2 P. Mie 2 C. Mironov 2 I.N. Naranjo 2 M. Nguyen 2 C. Ochando 2 P. Paganini 2 D. Sabes 2 R. Salerno 2 Y. Sirois 2 C. Veelken 2 A. Zabi 2 J.-L. Agram 3 J. Andrea 3 D. Bloch 3 D. Bodin 3 J.-M. Brom 3 E.C. Chabert 3 C. Collard 3 E. Conte 3 F. Drouhin 3 J.-C. Fontaine 3 D. Gele 3 U. Goerlach 3 C. Goetzmann 3 P. Juillot 3 A.-C. Le Bihan 3 P. van Hove 3 S. Gadrat 4 S. Beauceron 5 N. Beaupere 5 G. Boudoul 5 S. Brochet 5 J. Chasserat 5 R. Chierici 5 D. Contardo 5 P. Depasse 5 H. El Mamouni 5 J. Fay 5 S. Gascon 5 M. Gouzevitch 5 B. Ille 5 T. Kurca 5 M. Lethuillier 5 L. Mirabito 5 S. Perries 5 L. Sgandurra 5 V. Sordini 5 Y. Tschudi 5 M. Vander Donckt 5 P. Verdier 5 S. Viret 5 
Abstract : Measurements are presented of the production of primary K(S)0 and Lambda particles in proton-proton collisions at sqrt(s) = 7 TeV in the region transverse to the leading charged-particle jet in each event. The average multiplicity and average scalar transverse momentum sum of K(S)0 and Lambda particles measured at pseudorapidities abs(eta) < 2 rise with increasing charged-particle jet pt in the range 1-10 GeV and saturate in the region 10-50 GeV. The rise and saturation of the strange particle yields and transverse momentum sums in the underlying event are similar to those observed for inclusive charged particles, which confirms the impact-parameter picture of multiple parton interactions. The results are compared to recent tunes of the PYTHIA Monte Carlo event generator. The PYTHIA simulations underestimate the data by 15-30% for K(S)0 mesons and by about 50% for Lambda baryons, a deficit similar to that observed for the inclusive strange particle production in non-single-diffractive proton-proton collisions. The constant strange- to charged-particle activity ratios and the similar trends for mesons and baryons indicate that the multiparton-interaction dynamics is decoupled from parton hadronization, which occurs at a later stage.
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Submitted on : Tuesday, May 28, 2013 - 7:26:12 AM
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S. Chatrchyan, M. Besançon, S. Choudhury, F. Couderc, M. Dejardin, et al.. Measurement of neutral strange particle production in the underlying event in proton-proton collisions at sqrt(s) = 7 TeV. Physical Review D, American Physical Society, 2013, 88, pp.052001. ⟨10.1103/PhysRevD.88.052001⟩. ⟨in2p3-00826629⟩

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