A. De Falco, R. Arnaldi, K. Banicz, K. Borer, J. Castor, B. Chaurand, W. Chen, C. Cicalo, A. Colla, P. Cortese, S. Damjanovic, A. David, A. Devaux, L. Ducroux, … 展开作者
A. De Falco, R. Arnaldi, K. Banicz, K. Borer, J. Castor, B. Chaurand, W. Chen, C. Cicalo, A. Colla, P. Cortese, S. Damjanovic, A. David, A. Devaux, L. Ducroux, H. En'yo, J. Fargeix, A. Ferretti, M. Floris, P. Force, A. Forster, N. Guettet, A. Guichard, H. Gulkanian, J. Heuser, M. Keil, L. Kluberg, Z. Li, C. Lourenço, J. Lozano, F. Manso, P. Martins, A. Masoni, A. Neves, H. Ohnishi, C. Oppedisano, P. Parracho, P. Pillot, T. Poghosyan, G. Puddu, E. Radermacher, P. Ramalhete, P. Rosinsky, E. Scomparin, J. Seixas, S. Serci, R. Shahoyan, P. Sonderegger, H. J. Specht, R. Tieulent, G. Usai, R. Veenhof, H. Wöhri, .
备注:
8 pages, 6 figures, proceedings of the Strangeness in Quark Matter 2008 conference (SQM08), Beijing, Oct.6-10, 2008
NA 60在CERN SPS测量了p-A和In-In碰撞中的双μ子产生。本文报道了158 AGeV的In-In碰撞中$ϕ$介子产生的高统计测量。横向动量,快度,衰变角分布和绝对产额作为中心性的函数进行测量。将结果与以前的测量结果进行比较,以揭示长期存在的$ϕ$难题。此外,重点介绍了$η$介子的生产和低于J/ $ψ$质量的双μ子过剩。
英文摘要:
NA60 measured dimuon production in p-A and In-In collisions at the CERN SPS. This paper presents a high statistics measurement of $ϕ$ meson production in In-In collisions at 158 AGeV. Both the transverse momentum, rapidity, decay angular distributions and the absolute yield were measured as a function of centrality. The results are compared to previous measurements in order to shed light on the long standing $ϕ$ puzzle. In addition, highlights on $η$ meson production and on the dimuon excess below the J/$ψ$ mass are presented.
Search for $t$-channel scalar and vector leptoquark exchange in the high-mass dimuon and dielectron spectra in proton-proton collisions at $\sqrt{s}$ = 13 TeV
EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH (CERN)(欧洲核子研究中心)
Exclusive dimuon production and coherent charmonium photoproduction at forward rapidity in ultra-peripheral Pb$-$Pb collisions at $\mathbf{\sqrt{s_{\rm NN}}=5.36}$ TeV
European Organization for Nuclear Research(欧洲核子研究中心)
High-luminosity Large Hadron Collider with laser-cooled isoscalar ion beams
本文介绍了伽马工厂计划的一个案例研究--欧洲核子研究中心加速器综合体中离子束的一种新的运行方案的建议。其目标是通过补充质子-质子碰撞计划与高光度核-核计划,扩大基于LHC的研究的范围和精度。其众多的物理学亮点包括光子-光子碰撞中独特的希格斯玻色子产生的研究和电弱(EW)参数的精确测量。有两种主要的方法可以增加LHC的亮度,而不需要升级CERN的注入器:(1)修改光束碰撞光学系统和(2)减少碰撞光束的横向发射度。前一个方案被正在进行的高光度(HL-LHC)计划所采用。后者,只适用于离子束,本文提出。它是基于激光冷却的部分剥离离子束在SPS平顶能量。对于满足本束操作约束并且对于EW物理学特别有吸引力的等oscillate钙束,在$8$秒长的冷却阶段内,横向束流发射度可以减少$5$的因子。在LHC顶能处的冷却钙束碰撞的预测的核子-核子光度$L_{NN}= 4.2 \times 10^{34}\,$ s $^{-1}$ cm $^{-2}$与HL-LHC质子-质子碰撞的能级光度相当,但具有减少的堆积背景。本文提出的方案,如果证实了未来的伽马工厂的原理验证实验,可以在欧洲核子研究中心实施的小基础设施投资。