Measurement of charm production in neutrino charged-current interactions
A. Kayis-Topaksu, G. Önengüt, R. van Dantzig, M. de Jong, R. G. C. Oldeman, M. Güler, U. Köse, P. Tolun, M. G. Catanesi, M. T. Muciaccia, K. Winter, B. Van de V… 展开作者
A. Kayis-Topaksu, G. Önengüt, R. van Dantzig, M. de Jong, R. G. C. Oldeman, M. Güler, U. Köse, P. Tolun, M. G. Catanesi, M. T. Muciaccia, K. Winter, B. Van de Vyver, P. Vilain, G. Wilquet, B. Saitta, E. Di Capua, S. Ogawa, H. Shibuya, I. R. Hristova, T. Kawamura, D. Kolev, H. Meinhard, J. Panman, A. Rozanov, R. Tsenov, J. W. E. Uiterwijk, P. Zucchelli, J. Goldberg, M. Chikawa, J. S. Song, C. S. Yoon, K. Kodama, N. Ushida, S. Aoki, T. Hara, T. Delbar, D. Favart, G. Grégoire, S. Kalinin, I. Makhlioueva, A. Artamonov, P. Gorbunov, V. Khovansky, V. Shamanov, I. Tsukerman, N. Bruski, D. Frekers, K. Hoshino, J. Kawada, M. Komatsu, M. Miyanishi, M. Nakamura, T. Nakano, K. Narita, K. Niu, K. Niwa, N. Nonaka, O. Sato, T. Toshito, S. Buontempo, A. G. Cocco, N. D'Ambrosio, G. De Lellis, G. De Rosa, F. Di Capua, G. Fiorillo, A. Marotta, M. Messina, P. Migliozzi, L. Scotto Lavina, P. Strolin, V. Tioukov, T. Okusawa, U. Dore, P. F. Loverre, L. Ludovici, G. Rosa, R. Santacesaria, A. Satta, F. R. Spada, E. Barbuto, C. Bozza, G. Grella, G. Romano, C. Sirignano, S. Sorrentino, Y. Sato, I. Tezuka
The nuclear emulsion target of the CHORUS detector was exposed to the wide-band neutrino beam of the CERN SPS of 27 GeV average neutrino energy from 1994 to 1997. In total about 100000 charged-current neutrino interactions with at least one identified muon were located in the emulsion target and fully reconstructed, using newly developed automated scanning systems. Charmed particles were searched for by a program recognizing particle decays. The observation of the decay in nuclear emulsion makes it possible to select a sample with very low background and minimal kinematical bias. 2013 charged-current interactions with a charmed hadron candidate in the final state were selected and confirmed through visual inspection. The charm production rate induced by neutrinos relative to the charged-current cross-section is measured to be sigma(nu_mu N -> mu- C X)/sigma(CC) = (5.75 +-0.32 stat +-0.30 syst)%. The charm production cross-section as a function of the neutrino energy is also obtained. The results are in good agreement with previous measurements. The charm-quark hadronization produces the following charmed hadrons with relative fractions (in %): f_Dzero = 43.7+-4.5, f_Lambda_c^plus = 19.2+-4.2, f_Dplus = 25.3+-4.2, and f_D_splus = 11.8+-4.7.
Measurement of branching fractions for two-body charmless B decays to charged pions and kaons at BABAR
We present preliminary results of a search for charmless two-body B decays to charged pions and kaons using data collected by the BABAR detector at the Stanford Linear Accelerator Center's PEP-II storage ring. In a sample of 8.8 million produced B-anti-B pairs we measure the branching fractions B(B^0 --> pi^+pi^-) = (9.3^{+2.6}_{-2.3}^{+1.2}_{-1.4}) x 10^{-6} and B(B^0 --> K^+π^-) = (12.5^{+3.0}_{-2.6}^{+1.3}_{-1.7}) x 10^{-6}, where the first uncertainty is statistical and the second is systematic. For the decay B^0 --> K^+K^- we find no significant signal and set an upper limit of B(B^0 --> …
Measurements of Charmless Two-Body Charged B Decays with Neutral Pions and Kaons
We present preliminary results of the analyses of B into h pi0 and B into hK0 decays (with h = pi+/-, K+/-) from a sample of approximately 60 million BB pairs collected by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. We find evidence for a signal in B+ into pi+ pi0, and we measure the branching fraction BR (B+ into pi+ pi0) = (4.1_{-1.0}^{+1.1} \pm 0.8) 10^{-6}. We also measure the following branching ratios and charge asymmetries: BR(B+ to K+ pi0) = (11.1_{-1.2}^{+1.3} \pm 1.0) 10^{-6}, BR(B+ to pi+ K0) = (17.5^{+1.8}_{-1.7} \pm 1.3)10^{-6} $, BR(B+ to K+ K0bar) < 1.3…
Search for Charm-quark Production via Dimuons in Neutrino Telescopes
中微子深度非弹性散射（DIS）过程中产生的粲夸克引起的双μ子事件在传统的DIS实验中已经研究了几十年。中微子望远镜的最新进展使得在远远超出实验室尺度的能量上搜索这样的双μ子事件成为可能。在本文中，我们构建了一个模拟框架，计算的双μ子信号的产额和分布在一个IceCube-like km ~ 3规模的中微子望远镜。由于双径迹横向距离分辨率的实验限制，只考虑探测器体积外产生的双μ子。展示了十年暴露的模拟结果的详细信息。早期的工作[1]和我们的工作都研究了类似的情况，因此我们使用该论文作为基线进行比较。然后我们估计了不同计算方法对μ子能量损失的影响，发现与蒙特卡罗模拟相比，平均能量损失公式计算的μ子能量损失更大。最后，我们研究了单μ子背景假设下双μ子搜索的实验潜力。我们的结果基于一个简化的双轨重建表明，特别是与ORCA配置的适度的灵敏度。因此，需要对重建算法和可能的检测器设计进行进一步的开发，并且正在调查中。
Studying charm hadronisation into baryons with azimuthal correlations of $Λ_{\rm c}^{+}$ with charged particles in pp collisions at $\mathbf{\sqrt{\it s} = 13}$ TeV
本研究利用ALICE探测器在13 TeV pp碰撞中首次测量$Λ_{\rm c}^{+}$重子与带电粒子的方位角关联，发现其关联低动量粒子多于D介子，且蒙特卡洛模型无法预测，暗示粲重子产生时强子化过程可能不同。
IC at IC: IceCube can constrain the intrinsic charm of the proton
冰立方发现的能量范围在$\sim$ 30 TeV - PeV的地外中微子为高能天体物理学提供了新的约束。该信号的一个重要背景是瞬发中微子，它起源于高能宇宙射线粒子在地球大气中相互作用产生的粲强子衰变。传统的方法是仅用胶子分裂$g \to c \bar c$计算粲强子产生。然而，QCD预言了重夸克分布的一个额外的“本征”分量，它来自重夸克与质子的价夸克多重连接的图。我们估计了由内禀粲引起的瞬发中微子谱。我们发现，大气提示中微子流量的内禀魅力是可比的使用QCD计算不包括内禀魅力，一旦我们规范化的ISR和LEBC-MPS合作数据的内禀魅力微分截面计算。在未来，冰立方将限制质子的内在魅力内容，并将有助于高能物理现象学的主要问题之一。
Investigating charm production and fragmentation via azimuthal correlations of prompt D mesons with charged particles in pp collisions at $\sqrt{s} = 13$ TeV
Measurement of charm and beauty production at central rapidity versus charged-particle multiplicity in proton-proton collisions at $\mathbf{\sqrt{\textit s}}=7$ TeV
