# Physical Review Letters (APS)

 2018-10-1802:16 First Observation of the Doubly Charmed Baryon Decay ${\Xi }_{cc}^{++}\to {\Xi }_{c}^{+}{\pi }^{+}$ / Aaij, R. ; Adeva, B. ; Adinolfi, M. ; Aidala, C. A. ; et al The doubly charmed baryon decay ${\Xi }_{cc}^{++}\to {\Xi }_{c}^{+}{\pi }^{+}$ is observed for the first time, with a statistical significance of $5.9\sigma$, confirming a recent observation of the baryon in the ${\Lambda }_{c}^{+}{K}^{-}{\pi }^{+}{\pi }^{+}$ final state. [...] Published in Physical Review Letters 121 (2018) 10.1103/PhysRevLett.121.162002 arXiv:1807.01919 Fulltext: XML PDF; 2018-10-1802:16 Sterile Neutrino Constraints from the STEREO Experiment with 66 Days of Reactor-On Data / Almazán, H. ; Sanchez, P. del Amo ; Bernard, L. ; Blanchet, A. ; et al The reactor antineutrino anomaly might be explained by the oscillation of reactor antineutrinos toward a sterile neutrino of eV mass. [...] Published in Physical Review Letters 121 (2018) 10.1103/PhysRevLett.121.161801 arXiv:1806.02096 Fulltext: PDF XML; 2018-10-1622:16 Transverse-Momentum-Dependent Distributions with Jets / Gutierrez-Reyes, Daniel ; Scimemi, Ignazio ; Waalewijn, Wouter J. ; Zoppi, Lorenzo We investigate the use of jets to measure transverse-momentum-dependent distributions (TMDs). [...] Published in Physical Review Letters 121 (2018) 10.1103/PhysRevLett.121.162001 arXiv:1807.07573 Fulltext: XML PDF; 2018-10-1522:16 All Tree Level Scattering Amplitudes in Chern-Simons Theories with Fundamental Matter / Inbasekar, Karthik ; Jain, Sachin ; Nayak, Pranjal ; Umesh, V. We show that Britto-Cachazo-Feng-Witten (BCFW) recursion relations can be used to compute all tree level scattering amplitudes in terms of $2\to 2$ scattering amplitude in $U\left(N\right)$ $N=2$ Chern-Simons (CS) theory coupled to matter in the fundamental representation. [...] Published in Physical Review Letters 121 (2018) 10.1103/PhysRevLett.121.161601 arXiv:1710.04227 Fulltext: XML PDF; 2018-10-1218:16 Mass Difference for Charged Quarks from Asymptotically Safe Quantum Gravity / Eichhorn, Astrid ; Held, Aaron We propose a scenario to retrodict the top and bottom mass and the Abelian gauge coupling from first principles in a microscopic model including quantum gravity. [...] Published in Physical Review Letters 121 (2018) 10.1103/PhysRevLett.121.151302 arXiv:1803.04027 Fulltext: XML PDF; 2018-10-1218:16 Probing the Quantum Interference between Singly and Doubly Resonant Top-Quark Production in $pp$ Collisions at $\sqrt{s}=13\text{}\text{}\mathrm{TeV}$ with the ATLAS Detector / Aaboud, M. ; Aad, G. ; Abbott, B. ; Abdinov, O. ; et al This Letter presents a normalized differential cross-section measurement in a fiducial phase-space region where interference effects between top-quark pair production and associated production of a single top quark with a $W$ boson and a $b$-quark are significant. [...] Published in Physical Review Letters 121 (2018) 10.1103/PhysRevLett.121.152002 arXiv:1806.04667 Fulltext: PDF XML; 2018-10-1018:16 First Monte Carlo Global QCD Analysis of Pion Parton Distributions / Barry, P. C. ; Sato, N. ; Melnitchouk, W. ; Ji, Chueng-Ryong We perform the first global QCD analysis of parton distribution functions (PDFs) in the pion, combining $\pi A$ Drell-Yan data with leading neutron electroproduction from HERA within a Monte Carlo approach based on nested sampling. [...] Published in Physical Review Letters 121 (2018) 10.1103/PhysRevLett.121.152001 arXiv:1804.01965 Fulltext: XML PDF; 2018-10-0918:16 Observation of the $Z\to \psi {\ell }^{+}{\ell }^{-}$ Decay in $pp$ Collisions at $\sqrt{s}=13\text{}\text{}\mathrm{TeV}$ / Sirunyan, A. M. ; Tumasyan, A. ; Adam, W. ; Ambrogi, F. ; et al This Letter presents the observation of the rare $Z$ boson decay $Z\to \psi {\ell }^{+}{\ell }^{-}$. [...] Published in Physical Review Letters 121 (2018) 10.1103/PhysRevLett.121.141801 arXiv:1806.04213 Fulltext: PDF XML; 2018-10-0918:16 Search for Pair-Produced Resonances Each Decaying into at Least Four Quarks in Proton-Proton Collisions at $\sqrt{s}=13\text{}\text{}\mathrm{TeV}$ / Sirunyan, A. M. ; Tumasyan, A. ; Adam, W. ; Ambrogi, F. ; et al This Letter presents the results of a search for pair-produced particles of masses above 100 GeV that each decay into at least four quarks. [...] Published in Physical Review Letters 121 (2018) 10.1103/PhysRevLett.121.141802 arXiv:1806.01058 Fulltext: XML PDF; 2018-10-0118:16 Line Defects and Radiation in $N=2$ Conformal Theories / Bianchi, Lorenzo ; Lemos, Madalena ; Meineri, Marco We study the conformal data of a generic superconformal line defect preserving half of the supercharges in a four-dimensional $N=2$ conformal theory. [...] Published in Physical Review Letters 121 (2018) 10.1103/PhysRevLett.121.141601 arXiv:1805.04111 Fulltext: XML PDF;