Title

Improved Λp Elastic Scattering Cross Sections between 0.9 and 2.0  GeV/c as a Main Ingredient of the Neutron Star Equation of State

DOI

10.1103/PhysRevLett.127.272303

Authors

J Rowley, Ohio University, Athens, Ohio 45701, USA.
N Compton, Ohio University, Athens, Ohio 45701, USA.
C Djalali, Ohio University, Athens, Ohio 45701, USA.
K Hicks, Ohio University, Athens, Ohio 45701, USA.
J Price, California State University, Dominguez Hills, Carson, California 90747, USA.
N Zachariou, University of York, York YO10 5DD, United Kingdom.
K P. Adhikari, Old Dominion University, Norfolk, Virginia 23529, USA.
W R. Armstrong, Argonne National Laboratory, Argonne, Illinois 60439, USA.
H Atac, Temple University, Philadelphia, Pennsylvania 19122, USA.
L Baashen, Florida International University, Miami, Florida 33199, USA.
L Barion, INFN, Sezione di Ferrara, 44100 Ferrara, Italy.
M Bashkanov, University of York, York YO10 5DD, United Kingdom.
M Battaglieri, INFN, Sezione di Genova, 16146 Genova, Italy.
I Bedlinskiy, National Research Centre Kurchatov Institute-ITEP, Moscow 117259, Russia.
F Benmokhtar, Duquesne University, 600 Forbes Avenue, Pittsburgh, Pennsylvania 15282, USA.
A Bianconi, INFN, Sezione di Pavia, 27100 Pavia, Italy.
L Biondo, INFN, Sezione di Catania, 95123 Catania, Italy.
A S. Biselli, Fairfield University, Fairfield Connecticut 06824, USA.
M Bondi, INFN, Sezione di Genova, 16146 Genova, Italy.
F Bossù, IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France.
S Boiarinov, Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
W J. Briscoe, The George Washington University, Washington, D.C. 20052, USA.
W K. Brooks, Universidad Técnica Federico Santa María, Casilla 110-V Valparaíso, Chile.
D Bulumulla, Old Dominion University, Norfolk, Virginia 23529, USA.
V D. Burkert, Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
D S. Carman, Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
J C. Carvajal, Florida International University, Miami, Florida 33199, USA.
A Celentano, INFN, Sezione di Genova, 16146 Genova, Italy.
P Chatagnon, Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France.
V Chesnokov, Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119234 Moscow, Russia.
T Chetry, Mississippi State University, Mississippi State, Mississippi 39762-5167, USA.
G Ciullo, Università di Ferrara, 44121 Ferrara, Italy.

Document Type

Journal Article

Publication Date

12-31-2021

Publication Title

Physical review letters

Volume

127

Issue

27

First Page

272303

Abstract

Strange matter is believed to exist in the cores of neutron stars based on simple kinematics. If this is true, then hyperon-nucleon interactions will play a significant part in the neutron star equation of state. Yet, compared to other elastic scattering processes, there is very little data on Λ-N scattering. This experiment utilized the CEBAF Large Acceptance Spectrometer (CLAS) detector to study the Λp→Λp elastic scattering cross section in the incident Λ momentum range 0.9-2.0  GeV/c. These are the first data on this reaction since the 1970s. The new cross sections have significantly better accuracy and precision than the existing world data, and the techniques developed here can also be used in future experiments.

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