scholarly journals Form factors from lattice QCD

2012 ◽  
Author(s):  
Dru Renner
Keyword(s):  
Lattice Qcd ◽  
Form Factors

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 Erratum: Bc→Bs(d) form factors from lattice QCD [Phys. Rev. D 102 , 014513 (2020)]

2021 ◽  
Vol 103 (9) ◽  
Author(s):  
Laurence J. Cooper ◽  
Christine T. H. Davies ◽  
Judd Harrison ◽  
Javad Komijani ◽  
Matthew Wingate ◽  
...  
Keyword(s):  
Lattice Qcd ◽  
Form Factors

scholarly journals Electric form factors of the octet baryons from lattice QCD and chiral extrapolation

2014 ◽  
Vol 90 (3) ◽  
Author(s):  
P. E. Shanahan ◽  
R. Horsley ◽  
Y. Nakamura ◽  
D. Pleiter ◽  
P. E. L. Rakow ◽  
...  
Keyword(s):  
Lattice Qcd ◽  
Form Factors ◽  
Chiral Extrapolation ◽  
Octet Baryons

scholarly journals Form factors for Lambda_b to Lambda transitions from lattice QCD

2012 ◽  
Author(s):  
Stefan Meinel ◽  
C.-J. David Lin ◽  
William Detmold ◽  
Matthew Wingate
Keyword(s):  
Lattice Qcd ◽  
Form Factors

scholarly journals Form factors in lattice QCD

2011 ◽  
Vol 198 (1) ◽  
pp. 79-94 ◽  
Author(s):  
B. B. Brandt ◽  
S. Capitani ◽  
M. Della Morte ◽  
D. Djukanovic ◽  
J. Gegelia ◽  
...  
Keyword(s):  
Lattice Qcd ◽  
Form Factors

Nucleon electromagnetic form factors from lattice QCD

2004 ◽  
pp. 9-14
Author(s):  
J. D. Ashley ◽  
D. B. Leinweber ◽  
A. W. Thomas ◽  
R. D. Young
Keyword(s):  
Lattice Qcd ◽  
Form Factors ◽  
Electromagnetic Form Factors

scholarly journals Nucleon’s energy–momentum tensor form factors in light-cone QCD

2020 ◽  
Vol 80 (2) ◽  
Author(s):  
K. Azizi ◽  
U. Özdem
Keyword(s):  
Perturbation Theory ◽  
Lattice Qcd ◽  
Chiral Perturbation Theory ◽  
Light Cone ◽  
Energy Momentum Tensor ◽  
Form Factors ◽  
Momentum Tensor ◽  
Tensor Form ◽  
Chiral Perturbation ◽  
Theoretical Predictions

Abstract We use the energy–momentum tensor (EMT) current to compute the EMT form factors of the nucleon in the framework of the light cone QCD sum rule formalism. In the calculations, we employ the most general form of the nucleon’s interpolating field and use the distribution amplitudes (DAs) of the nucleon with two sets of the numerical values of the main input parameters entering the expressions of the DAs. The directly obtained results from the sum rules for the form factors are reliable at $$ Q^2\ge 1$$Q2≥1 GeV$$^2 $$2: to extrapolate the results to include the zero momentum transfer squared with the aim of estimation of the related static physical quantities, we use some fit functions for the form factors. The numerical computations show that the energy–momentum tensor form factors of the nucleon can be well fitted to the multipole fit form. We compare the results obtained for the form factors at $$ Q^2=0 $$Q2=0 with the existing theoretical predictions as well as experimental data on the gravitational form factor d$$_1^q(0)$$1q(0). For the form factors M$$_2^q (0)$$2q(0) and J$$^q(0)$$q(0) a consistency among the theoretical predictions is seen within the errors: our results are nicely consistent with the Lattice QCD and chiral perturbation theory predictions. However, there are large discrepancies among the theoretical predictions on d$$_1^q(0)$$1q(0). Nevertheless, our prediction is in accord with the JLab data as well as with the results of the Lattice QCD, chiral perturbation theory and KM15-fit. Our fit functions well define most of the JLab data in the interval $$ Q^2\in [0,0.4]$$Q2∈[0,0.4] GeV$$^2 $$2, while the Lattice results suffer from large uncertainties in this region. As a by-product, some mechanical properties of the nucleon like the pressure and energy density at the center of nucleon as well as its mechanical radius are also calculated and their results are compared with other existing theoretical predictions.

scholarly journals Strange nucleon electromagnetic form factors from lattice QCD

2018 ◽  
Vol 97 (9) ◽  
Author(s):  
C. Alexandrou ◽  
M. Constantinou ◽  
K. Hadjiyiannakou ◽  
K. Jansen ◽  
C. Kallidonis ◽  
...  
Keyword(s):  
Lattice Qcd ◽  
Form Factors ◽  
Electromagnetic Form Factors

scholarly journals Axial Vector Form Factors from Lattice QCD that Satisfy the PCAC Relation

2020 ◽  
Vol 124 (7) ◽  
Author(s):  
Yong-Chull Jang ◽  
Rajan Gupta ◽  
Boram Yoon ◽  
Tanmoy Bhattacharya
Keyword(s):  
Lattice Qcd ◽  
Axial Vector ◽  
Form Factors ◽  
Vector Form
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