# Physical Review Letters (APS)

 2019-07-1802:16 Unitary Extension of Exotic Massive 3D Gravity from Bigravity / Ozkan, Mehmet ; Pang, Yi ; Zorba, Utku We obtain a new 3D gravity model from two copies of parity-odd Einstein-Cartan theories. [...] Published in Physical Review Letters 123 (2019) 10.1103/PhysRevLett.123.031303 External links: pdf; xml 2019-07-1718:16 Aligned and Spontaneous Flavor Violation / Egana-Ugrinovic, Daniel ; Homiller, Samuel ; Meade, Patrick We present a systematic spurion setup called aligned flavor violation (AFV) that allows for new physics couplings to quarks that are aligned with standard model (SM) Yukawa couplings, but do not necessarily share their hierarchies nor are family universal. [...] Published in Physical Review Letters 123 (2019) 10.1103/PhysRevLett.123.031802 External links: pdf; xml 2019-07-1718:16 Deciphering the $X\left(3872\right)$ via its Polarization in Prompt Production at the CERN LHC / Butenschoen, Mathias ; He, Zhi-Guo ; Kniehl, Bernd A. Based on the hypothesis that the $X\left(3872\right)$ exotic hadron is a mixture of ${\chi }_{c1}\left(2P\right)$ and other states and that its prompt hadroproduction predominately proceeds via its ${\chi }_{c1}\left(2P\right)$ component, we calculate the $\mathrm{prompt}\text{−}X\left(3872\right)$ polarization at the CERN LHC through next-to-leading order in ${\alpha }_{s}$ within the factorization formalism of nonrelativistic QCD, including both the color-singlet ${}^{3}{P}_{1}^{\left[1\right]}$ and color-octet ${}^{3}{S}_{1}^{\left[8\right]}$ $c\overline{c}$ Fock states. [...] Published in Physical Review Letters 123 (2019) 10.1103/PhysRevLett.123.032001 External links: pdf; xml 2019-07-1522:16 First Observation of the Radiative Decay ${\Lambda }_{b}^{0}\to \Lambda \gamma$ / Aaij, R. ; Abellán Beteta, C. ; Adeva, B. ; Adinolfi, M. ; et al The radiative decay ${\Lambda }_{b}^{0}\to \Lambda \gamma$ is observed for the first time using a data sample of proton-proton collisions corresponding to an integrated luminosity of $1.7\text{}\text{}{\mathrm{fb}}^{-1}$ collected by the LHCb experiment at a center-of-mass energy of 13 TeV. [...] Published in Physical Review Letters 123 (2019) 10.1103/PhysRevLett.123.031801 External links: pdf; xml 2019-07-1018:16 Beam Energy and Centrality Dependence of Direct-Photon Emission from Ultrarelativistic Heavy-Ion Collisions / Adare, A. ; Afanasiev, S. ; Aidala, C. ; Ajitanand, N. N. ; et al The PHENIX collaboration presents first measurements of low-momentum ($0.4<{p}_{T}<3\text{}\text{}\mathrm{GeV}/c$) direct-photon yields from $\mathrm{Au}+\mathrm{Au}$ collisions at $\sqrt{{s}_{NN}}=39$ and 62.4 GeV. [...] Published in Physical Review Letters 123 (2019) 10.1103/PhysRevLett.123.022301 External links: pdf; xml 2019-07-1002:16 Studies of Beauty Suppression via Nonprompt ${D}^{0}$ Mesons in Pb-Pb Collisions at $\sqrt{{s}_{\mathrm{NN}}}=5.02\text{}\text{}\mathrm{TeV}$ / Sirunyan, A. M. ; Tumasyan, A. ; Adam, W. ; Ambrogi, F. ; et al The transverse momentum spectra of ${D}^{0}$ mesons from $b$ hadron decays are measured at midrapidity ($|y|<1$) in $pp$ and Pb-Pb collisions at a nucleon-nucleon center of mass energy of 5.02 TeV with the CMS detector at the LHC. [...] Published in Physical Review Letters 123 (2019) 10.1103/PhysRevLett.123.022001 External links: pdf; xml 2019-07-1002:16 Magnetic Monopole Search with the Full MoEDAL Trapping Detector in 13 TeV $pp$ Collisions Interpreted in Photon-Fusion and Drell-Yan Production / Acharya, B. ; Alexandre, J. ; Baines, S. ; Benes, P. ; et al MoEDAL is designed to identify new physics in the form of stable or pseudostable highly ionizing particles produced in high-energy Large Hadron Collider (LHC) collisions. [...] Published in Physical Review Letters 123 (2019) 10.1103/PhysRevLett.123.021802 External links: pdf; xml 2019-07-0918:16 Probing Axionlike Particles and the Axiverse with Superconducting Radio-Frequency Cavities / Bogorad, Zachary ; Hook, Anson ; Kahn, Yonatan ; Soreq, Yotam Axionlike particles (ALPs) with couplings to electromagnetism have long been postulated as extensions to the standard model. [...] Published in Physical Review Letters 123 (2019) 10.1103/PhysRevLett.123.021801 External links: pdf; xml 2019-07-0222:16 Novel Method for the Direct Measurement of the $\tau$ Lepton Dipole Moments / Fu, J. ; Giorgi, M. A. ; Henry, L. ; Marangotto, D. ; et al A novel method for the direct measurement of the elusive magnetic and electric dipole moments of the $\tau$ lepton is presented. [...] Published in Physical Review Letters 123 (2019) 10.1103/PhysRevLett.123.011801 External links: pdf; xml 2019-07-0122:16 Path Integral Optimization as Circuit Complexity / Camargo, Hugo A. ; Heller, Michal P. ; Jefferson, Ro ; Knaute, Johannes Early efforts to understand complexity in field theory have primarily employed a geometric approach based on the concept of circuit complexity in quantum information theory. [...] Published in Physical Review Letters 123 (2019) 10.1103/PhysRevLett.123.011601 External links: pdf; xml