Resonance Production and $ππ$ S-wave in $π^- + p \rightarrow π^- π^- π^+ + p_{recoil}$ at 190 GeV/c
C. Adolph, R. Akhunzyanov, M. G. Alexeev, G. D. Alexeev, A. Amoroso, V. Andrieux, V. Anosov, W. Augustyniak, A. Austregesilo, C. D. R. Azevedo, B. Badełek, F. B… 展开作者
C. Adolph, R. Akhunzyanov, M. G. Alexeev, G. D. Alexeev, A. Amoroso, V. Andrieux, V. Anosov, W. Augustyniak, A. Austregesilo, C. D. R. Azevedo, B. Badełek, F. Balestra, J. Barth, R. Beck, Y. Bedfer, J. Bernhard, K. Bicker, E. R. Bielert, R. Birsa, J. Bisplinghoff, M. Bodlak, M. Boer, P. Bordalo, F. Bradamante, C. Braun, A. Bressan, M. Büchele, E. Burtin, W. -C. Chang, M. Chiosso, I. Choi, S. U. Chung, A. Cicuttin, M. L. Crespo, Q. Curiel, S. Dalla Torre, S. S. Dasgupta, S. Dasgupta, O. Yu. Denisov, L. Dhara, S. V. Donskov, N. Doshita, V. Duic, W. Dünnweber, M. Dziewiecki, A. Efremov, P. D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, M. Finger, M. Finger, H. Fischer, C. Franco, N. du Fresne von Hohenesche, J. M. Friedrich, V. Frolov, E. Fuchey, F. Gautheron, O. P. Gavrichtchouk, S. Gerassimov, F. Giordano, I. Gnesi, M. Gorzellik, S. Grabmüller, A. Grasso, M. Grosse Perdekamp, B. Grube, T. Grussenmeyer, A. Guskov, F. Haas, D. Hahne, D. von Harrach, R. Hashimoto, F. H. Heinsius, F. Herrmann, F. Hinterberger, N. Horikawa, N. d'Hose, C. -Y. Hsieh, S. Huber, S. Ishimoto, A. Ivanov, Yu. Ivanshin, T. Iwata, R. Jahn, V. Jary, R. Joosten, P. Jörg, E. Kabuß, B. Ketzer, G. V. Khaustov, Yu. A. Khokhlov, Yu. Kisselev, F. Klein, K. Klimaszewski, J. H. Koivuniemi, V. N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V. F. Konstantinov, A. M. Kotzinian, O. Kouznetsov, M. Krämer, P. Kremser, F. Krinner, Z. V. Kroumchtein, N. Kuchinski, F. Kunne, K. Kurek, R. P. Kurjata, A. A. Lednev, A. Lehmann, M. Levillain, S. Levorato, J. Lichtenstadt, R. Longo, A. Maggiora, A. Magnon, N. Makins, N. Makke, G. K. Mallot, C. Marchand, B. Marianski, A. Martin, J. Marzec, J. Matoušek, H. Matsuda, T. Matsuda, G. Meshcheryakov, W. Meyer, T. Michigami, Yu. V. Mikhailov, Y. Miyachi, P. Montuenga, A. Nagaytsev, F. Nerling, D. Neyret, V. I. Nikolaenko, J. Nový, W. -D. Nowak, G. Nukazuka, A. S. Nunes, A. G. Olshevsky, I. Orlov, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, J. -C. Peng, F. Pereira, M. Pešek, D. V. Peshekhonov, S. Platchkov, J. Pochodzalla, V. A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, C. Riedl, N. S. Rossiyskaya, D. I. Ryabchikov, A. Rychter, V. D. Samoylenko, A. Sandacz, C. Santos, S. Sarkar, I. A. Savin, G. Sbrizzai, P. Schiavon, T. Schlüter, K. Schmidt, H. Schmieden, K. Schönning, S. Schopferer, A. Selyunin, O. Yu. Shevchenko, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, F. Sozzi, A. Srnka, M. Stolarski, M. Sulc, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, S. Takekawa, S. Tessaro, F. Tessarotto, F. Thibaud, F. Tosello, V. Tskhay, S. Uhl, J. Veloso, M. Virius, T. Weisrock, M. Wilfert, J. ter Wolbeek, K. Zaremba, M. Zavertyaev, E. Zemlyanichkina, M. Ziembicki, A. Zink
The COMPASS collaboration has collected the currently largest data set on diffractively produced $π^-π^-π^+$ final states using a negative pion beam of 190 GeV/c momentum impinging on a stationary proton target. This data set allows for a systematic partial-wave analysis in 100 bins of three-pion mass, $0.5 < m_{3π} < 2.5$ GeV/c$^2$ , and in 11 bins of the reduced four-momentum transfer squared, $0.1 < t < 1.0$ (GeV/c)$^2$ . This two-dimensional analysis offers sensitivity to genuine one-step resonance production, i.e. the production of a state followed by its decay, as well as to more complex dynamical effects in nonresonant $3π$ production. In this paper, we present detailed studies on selected $3π$ partial waves with $J^{PC} = 0^{-+}$, $1^{++}$, $2^{-+}$, $2^{++}$, and $4^{++}$. In these waves, we observe the well-known ground-state mesons as well as a new narrow axial-vector meson $a_1(1420)$ decaying into $f_0(980) π$. In addition, we present the results of a novel method to extract the amplitude of the $π^-π^+$ subsystem with $I^{G}J^{PC} = 0^+ 0^{++}$ in various partial waves from the $π^-π^-π^+$ data. Evidence is found for correlation of the $f_0(980)$ and $f_0(1500)$ appearing as intermediate $π^- π^+$ isobars in the decay of the known $π(1800)$ and $π_2(1880)$.
Measurement of medium-induced acoplanarity in central Au-Au and pp collisions at $\sqrt{s_{\rm NN}}=200$ GeV using direct-photon+jet and $π^{0}$+jet correlations
Beam-Recoil Polarization Transfer in the Nucleon Resonance Region in the Exclusive $\vec{e}p \to e'K^+\vecΛ$ and $\vec{e}p \to e'K^+\vecΣ^0$ Reactions at CLAS
Recoil Geometry Unmasks Gluon Saturation in Forward $Z^0$ Production
Fudan University（复旦大学）；Peking University（北京大学）；Institute of Modern Physics, Chinese Academy of Sciences（中国科学院近代物理研究所）；Shandong University (Qingdao)（山东大学（青岛））
我们提出了一种新的方法来定义射流替代聚类方法，如反$k_T$计划，直接利用运动学数据。相反，新方法使用运动学信息来表示多维空间中的粒子，如谱聚类。在确认了它的红外（IR）安全性后，我们比较了它在分析来自蒙特卡罗（MC）样本的$qq\to H_{125\,\text{GeV}} \rightarrow H_{40\,\text{GeV}} H_{40\,\text{GeV}} \rightarrow b \bar{b} b \bar{b}$、$qq\to H_{500\,\text{GeV}} \rightarrow H_{125\,\text{GeV}} H_{125\,\text{GeV}} \rightarrow b \bar{b} b \bar{b}$和$gg,q\bar q\to t\bar t\to b\bar b W^+W^-\to b\bar b jj \ellν_\ell$事件时的性能，特别是在重建相关最终状态时的性能。最后，我们表明，谱聚类的结果得到的算法的参数设置没有任何变化，不像反kT的情况下，这需要调整锥的大小的物理过程中的研究。
Probing CP-violating $h\bar{t}t$ coupling in $e^{+}e^{-}\rightarrow h γ$
我们研究了在未来的高亮度$e^{+}e^{-}$对撞机上探测过程$e^{+}e^{-}\rightarrow h γ$中CP破坏的$h\bar{t}t$耦合的可能性。我们的数值结果表明，该过程的横截面可以显着增加允许CP相$ξ$和质心能量。例如，对于$\sqrt{s}=350~\mathrm{GeV}$和$ξ=3π/5$，横截面约为标准模型（SM）的6倍（参见$ξ$定义的文本）。对信号过程$e^{+}e^{-}\rightarrow h γ\rightarrow b \bar{b}γ$及其背景的模拟表明，在积分光度$\mathcal{L}=3~\text{ab}^{-1}$和$ξ\in[π/2,3π/5]$的情况下，信号显著性分别达到了对$\sqrt{s}=350~\mathrm{GeV},\ 500~\mathrm{GeV}$的$4.8σ$和$2.3σ$以上。对于$\mathcal{L}=10~\text{ab}^{-1}$，对于CP阶段$ξ\in[π/2,3π/5]$，$\sqrt{s}=350~\mathrm{GeV}$的信号显著性可以大于5，对于$\sqrt{s}=500~\mathrm{GeV}$的信号显著性可以大于3.9。除了截面增强外，CP破坏的$h\bar{t}t$耦合将导致SM中不存在的前后不对称$A_{FB}$，这是新CP破坏的明显信号。与Higgs衰变$h\r…
Measurement of the Higgs boson mass in the $H\rightarrow ZZ^* \rightarrow 4\ell$ and $H \rightarrow γγ$ channels with $\sqrt{s}=13$ TeV $pp$ collisions using the ATLAS detector
Measurements of the $γ_{v} p \rightarrow p' π^{+} π^{-}$ cross section with the CLAS detector for $0.4$ GeV$^{2}$ $< Q^{2} <$ $1.0$ GeV$^{2}$ and $1.3$ GeV $< W <$ $1.825$ GeV
新的结果上的单微分和全积分截面的过程$γ_{v} p \rightarrow p' π^{+} π^{-}$。实验数据是用杰斐逊实验室的CLAS探测器收集的。在运动学区域的反应不变质量$W$从1.3到1.825 GeV和光子虚$Q^2$从0.4到1.0 GeV $^2$进行测量。横截面中获得窄$Q^{2}$箱（0.05 GeV $^{2}$）与最小的统计不确定性达到双π介子电生产实验的日期。结果发现，在重叠的地方，与以前可用的数据一致。提取的截面，这是基于一个唯象的介子重子反应模型的初步解释，揭示了大量的相对贡献核子共振。这些数据提供了有前途的前景，以提高知识的$Q^{2}$ -进化的电耦合的大多数共振质量高达$\sim$ 1.8 GeV。
Search for charged Higgs bosons decaying via $H^{\pm} \rightarrow τ^{\pm}ν$ in fully hadronic final states using $pp$ collision data at $\sqrt{s} = 8$ TeV with the ATLAS detector
Search for an additional, heavy Higgs boson in the $H\rightarrow ZZ$ decay channel at $\sqrt{s}$ = 8 TeV in $pp$ collision data with the ATLAS detector
Experimental prospects for precision observables in $e^{-}e^{+}\rightarrow q\bar{q}$ with $q=b,c$ processes at the ILC operating at 250 and 500 GeV of center of mass
Data-Driven Modeling of Electron Recoil Nucleation in PICO C$_3$F$_8$ Bubble Chambers
适度过热的泡室探测器的主要优点是它们同时对来自WIMP暗物质的核反冲敏感，而对电子反冲背景不敏感。PICO伽马校准数据的全面分析表明，第一次，电子反冲在C $_3$ F $_8$规模根据一个新的成核机制，而不是一个驱动的热尖峰如先前所假设的。使用该半经验模型，泡室成核阈值可以被调整为对较低能量的核反冲敏感，同时保持优异的电子反冲排斥。PICO-40 L探测器将利用该模型实现低至2.8 keV的热力学阈值，同时由太阳中微子的相干弹性中微子-核散射的单散射事件主导。在一年的运行中，PICO-40 L可以将PICO对自旋相关的WIMP-质子耦合的现有领先限制提高近一个数量级，使WIMP质量大于3 GeV c $^{-2}$，并将有能力超过所有现有的非氙约束的自旋无关的WIMP-核子耦合的WIMP质量从3到40 GeV c $^{-2}$。
