scholarly journals Axial-Current Matrix Elements in Light Nuclei from Lattice QCD

2017 ◽  
Author(s):  
Martin Savage ◽  
Silas Beane ◽  
Emmanuel Chang ◽  
Zohreh Davoudi ◽  
William Detmold ◽  
...  
Keyword(s):  
Lattice Qcd ◽  
Axial Current ◽  
Light Nuclei ◽  
Matrix Elements

scholarly journals Double parton distributions in the pion from lattice QCD

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
Gunnar S. Bali ◽  
Luca Castagnini ◽  
Markus Diehl ◽  
Jonathan R. Gaunt ◽  
Benjamin Gläßle ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Lattice Qcd ◽  
Quark Mass ◽  
Matrix Elements ◽  
Parton Distributions ◽  
Almost All ◽  
The Relationship

Abstract We perform a lattice study of double parton distributions in the pion, using the relationship between their Mellin moments and pion matrix elements of two local currents. A good statistical signal is obtained for almost all relevant Wick contractions. We investigate correlations in the spatial distribution of two partons in the pion, as well as correlations involving the parton polarisation. The patterns we observe depend significantly on the quark mass. We investigate the assumption that double parton distributions approximately factorise into a convolution of single parton distributions.

scholarly journals Light-cone sum rules for proton decay

2021 ◽  
Vol 2021 (5) ◽  
Author(s):  
Ulrich Haisch ◽  
Amando Hala
Keyword(s):  
Lattice Qcd ◽  
Light Cone ◽  
Sum Rules ◽  
State Of The Art ◽  
Form Factors ◽  
Baryon Number ◽  
Proton Decay ◽  
Matrix Elements ◽  
Decay Channels ◽  
Systematic Uncertainties

Abstract We estimate the form factors that parametrise the hadronic matrix elements of proton-to-pion transitions with the help of light-cone sum rules. These form factors are relevant for semi-leptonic proton decay channels induced by baryon-number violating dimension-six operators, as typically studied in the context of grand unified theories. We calculate the form factors in a kinematical regime where the momentum transfer from the proton to the pion is space-like and extrapolate our final results to the regime that is relevant for proton decay. In this way, we obtain estimates for the form factors that show agreement with the state-of-the-art calculations in lattice QCD, if systematic uncertainties are taken into account. Our work is a first step towards calculating more involved proton decay channels where lattice QCD results are not available at present.

scholarly journals Scalar, Axial, and Tensor Interactions of Light Nuclei from Lattice QCD

2018 ◽  
Vol 120 (15) ◽  
Author(s):  
Emmanuel Chang ◽  
Zohreh Davoudi ◽  
William Detmold ◽  
Arjun S. Gambhir ◽  
Kostas Orginos ◽  
...  
Keyword(s):  
Lattice Qcd ◽  
Light Nuclei

scholarly journals Neutrinoless double- β decay matrix elements in light nuclei

2018 ◽  
Vol 97 (1) ◽  
Author(s):  
S. Pastore ◽  
J. Carlson ◽  
V. Cirigliano ◽  
W. Dekens ◽  
E. Mereghetti ◽  
...  
Keyword(s):  
Light Nuclei ◽  
Matrix Elements ◽  
Β Decay ◽  
Double Β Decay

scholarly journals First lattice QCD study of the gluonic structure of light nuclei

2017 ◽  
Vol 96 (9) ◽  
Author(s):  
Frank Winter ◽  
William Detmold ◽  
Arjun S. Gambhir ◽  
Kostas Orginos ◽  
Martin J. Savage ◽  
...  
Keyword(s):  
Lattice Qcd ◽  
Light Nuclei

scholarly journals Electroweak matrix elements in the two-nucleon sector from lattice QCD

2004 ◽  
Vol 743 (1-3) ◽  
pp. 170-193 ◽  
Author(s):  
William Detmold ◽  
Martin J. Savage
Keyword(s):  
Lattice Qcd ◽  
Matrix Elements

scholarly journals The gluon structure of hadrons and nuclei from lattice QCD

2018 ◽  
Vol 175 ◽  
pp. 01015
Author(s):  
Phiala Shanahan
Keyword(s):  
Transverse Momentum ◽  
Lattice Qcd ◽  
Degrees Of Freedom ◽  
Form Factors ◽  
Light Nuclei ◽  
Transverse Momentum Dependent ◽  
Gluon Distributions

I discuss recent lattice QCD studies of the gluon structure of hadrons and light nuclei. After very briefly highlighting new determinations of the gluon contributions to the nucleon’s momentum and spin, presented by several collaborations over the last year, I describe first calculations of gluon generalised form factors. The generalised transversity gluon distributions are of particular interest since they are purely gluonic; they do not mix with quark distributions at leading twist. In light nuclei they moreover provide a clean signature of non-nucleonic gluon degrees of freedom, and I present the first evidence for such effects, based on lattice QCD calculations. The planned Electron-Ion Collider, designed to access gluon structure quantities, will have the capability to test this prediction, and measure a range of gluon observables including generalised gluon distributions and transverse momentum dependent gluon distributions, within the next decade.

scholarly journals Neutron Electric Dipole Moment on the Lattice

2018 ◽  
Vol 175 ◽  
pp. 01014 ◽  
Author(s):  
Boram Yoon ◽  
Tanmoy Bhattacharya ◽  
Rajan Gupta
Keyword(s):  
Dipole Moment ◽  
Cp Violation ◽  
Lattice Qcd ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Beyond The Standard Model ◽  
Matrix Elements ◽  
The Standard Model ◽  
The Status ◽  
Good Probe

For the neutron to have an electric dipole moment (EDM), the theory of nature must have T, or equivalently CP, violation. Neutron EDM is a very good probe of novel CP violation in beyond the standard model physics. To leverage the connection between measured neutron EDM and novel mechanism of CP violation, one requires the calculation of matrix elements for CP violating operators, for which lattice QCD provides a first principle method. In this paper, we review the status of recent lattice QCD calculations of the contributions of the QCD Θ-term, the quark EDM term, and the quark chromo-EDM term to the neutron EDM.

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