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新山 雅之 所属 京都産業大学 理学部 物理科学科 職種 教授 |
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| 発行・発表の年月 | 2020/08 |
| 形態種別 | その他 |
| 標題 | Measurement of two-particle correlations in hadronic $e^{+}e^{-}$ collisions at Belle |
| 執筆形態 | その他 |
| 著者・共著者 | Belle Collaboration,A. Abdesselam,I. Adachi,K. Adamczyk,J. K. Ahn,H. Aihara,S. Al Said,K. Arinstein,Y. Arita,D. M. Asner,H. Atmacan,V. Aulchenko,T. Aushev,R. Ayad,T. Aziz,V. Babu,S. Bahinipati,A. M. Bakich,Y. Ban,E. Barberio,M. Barrett,M. Bauer,P. Behera,C. Beleño,K. Belous,J. Bennett,M. Berger,F. Bernlochner,M. Bessner,D. Besson,V. Bhardwaj,B. Bhuyan,T. Bilka,J. Biswal,T. Bloomfield,A. Bobrov,A. Bondar,G. Bonvicini,A. Bozek,M. Bračko,N. Braun,F. Breibeck,T. E. Browder,M. Campajola,L. Cao,G. Car |
| 概要 | The enhancement of charged-particle pairs with large pseudorapidity
difference and small azimuthal angle difference, often referred to as the ``ridge signal'', is a phenomenon widely observed in high multiplicity proton-proton, proton-ion and deutron-ion collisions, which is not yet fully understood. In heavy-ion collisions, the hydrodynamic expansion of the Quark-Gluon Plasma is one of the possible explanations of the origin of the ridge signal. Measurements in the $e^+e^-$ collision system, without the complexities introduced by hadron structure in the initial state, can serve as a complementary probe to examine the formation of a ridge signal. The first measurement of two-particle angular correlation functions in high multiplicity $e^+e^-$ collisions at $\sqrt{s}=10.52$ GeV is reported. The hadronic $e^+e^-$ annihilation data collected by the Belle detector at KEKB are used in this study. Two-particle angular correlation functions are measured over the full azimuth and large pseudorapidity intervals which are defined by either the electron beam axis or the event thrust as a function of charged particle multiplicity. The measurement in the event thrust analysis, with mostly outgoing quark pairs determining the reference axis, is sensitive to the region of additional soft gluon emissions. No significant ridge signal is observed with either coordinates analyses. Near side jet correlations appear to be absent in the thrust axis analysis. The measurements are compared to predictions from various event generators and expected to provide new constraints to the phenomenological models in the low energy regime. |
| PermalinkURL | http://arxiv.org/abs/2008.04187v1 |
| researchmap用URL | http://arxiv.org/pdf/2008.04187v1 |