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Academic literature on the topic 'Pion masses'

Author: Grafiati
Published: 6 September 2023

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Journal articles on the topic "Pion masses"

1

LEBIEDOWICZ, PIOTR, та ANTONI SZCZUREK. "EXCLUSIVE PRODUCTION OF π+π- PAIRS IN PROTON-PROTON AND PROTON-ANTIPROTON COLLISIONS". International Journal of Modern Physics A 26, № 03n04 (2011): 748–50. http://dx.doi.org/10.1142/s0217751x11052724.

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We report on a detailed investigation of four-body pp → ppπ+π- and [Formula: see text] reactions which constitute an irreducible background to three-body processes pp → ppM, where M is a broad resonance in the π+π- channel, e.g. M = σ, ρ0, f0(980), f2(1275), f0(1500). We include double-diffractive contribution (both pomeron and reggeon exchanges) as well as the pion-pion rescattering contributions. The first process dominates at higher energies and small pion-pion invariant masses while the second becomes important at lower energies and higher pion-pion invariant masses. We compare our results
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2

Dominguez, C. A., M. Loewe, and M. Lushozi. "Scalar Form Factor of the Pion in the Kroll-Lee-Zumino Field Theory." Advances in High Energy Physics 2015 (2015): 1–4. http://dx.doi.org/10.1155/2015/803232.

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The renormalizable Kroll-Lee-Zumino field theory of pions and a neutral rho-meson is used to determine the scalar form factor of the pion in the space-like region at next-to-leading order. Perturbative calculations in this framework are parameter-free, as the masses and the rho-pion-pion coupling are known from experiment. Results compare favorably with lattice QCD calculations.
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3

Friedrich, Jan. "Chiral symmetry breaking: Current experimental status and prospects." EPJ Web of Conferences 282 (2023): 01007. http://dx.doi.org/10.1051/epjconf/202328201007.

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Chiral symmetry, linked to the smallness of the quark masses compared to the QCD bound states, and its breaking pattern are exploited in effective field theory to describe a multitude of phenomena by a few low-energy constants. Those concern light-meson dynamics and decays, their couplings to photons and meson-nucleon interactions. Special emphasis is given to the pion properties, in terms of pion-pion low-energy scattering, the pion polarizability and the chiral anomaly, which describes the coupling of three pions to a photon. These properties are studied by the COMPASS collaboration at CERN
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Bussone, Andrea, Michele Della Morte, and Tadeusz Janowski. "Electromagnetic corrections to the hadronic vacuum polarization of the photon within QEDL and QEDM." EPJ Web of Conferences 175 (2018): 06005. http://dx.doi.org/10.1051/epjconf/201817506005.

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We compute the leading QED corrections to the hadronic vacuum polarization (HVP) of the photon, relevant for the determination of leptonic anomalous magnetic moments, al. We work in the electroquenched approximation and use dynamical QCD configurations generated by the CLS initiative with two degenerate flavors of nonperturbatively O(a)-improved Wilson fermions. We consider QEDL and QEDM to deal with the finite-volume zero modes. We compare results for the Wilson loops with exact analytical determinations. In addition we make sure that the volumes and photon masses used in QEDM are such that t
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5

Cahill, Reginald T., and Susan M. Gunner. "The Pion Mass Formula." Australian Journal of Physics 51, no. 3 (1998): 509. http://dx.doi.org/10.1071/p96110.

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The often used Gell-Mann–Oakes–Renner (GMOR) mass formula for Nambu-Goldstone (NG) bosons in QCD, such as the pions, involves the condensate ·q q Ò fp and the quark current masses. Within the context of the Global Colour Model (GCM) for QCD a manifestly different formula was recently found. Remarkably, Langfeld and Kettner have shown the two formulae to be equivalent. Here we note that the above recent analyses refer to the constituent pion and not the exact pion, even within the GCM. Further we generalise the Langfeld-Kettner identity to include the full response of the constituent quark corr
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6

Sanchis-Alepuz, Hèlios, Christian S. Fischer, and Stanislav Kubrak. "Pion cloud effects on baryon masses." Physics Letters B 733 (June 2014): 151–57. http://dx.doi.org/10.1016/j.physletb.2014.04.031.

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7

Nam, Soonkeon, and Ron L. Workman. "Generalized Skyrme model with pion masses." Physical Review D 41, no. 7 (1990): 2323–26. http://dx.doi.org/10.1103/physrevd.41.2323.

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8

SAHU, SARIRA, and S. C. PHATAK. "NUCLEON PROPERTIES IN CHIRAL COLOR DIELECTRIC MODEL." Modern Physics Letters A 07, no. 08 (1992): 709–21. http://dx.doi.org/10.1142/s0217732392000689.

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The chiral extension of color dielectric model has been used to study the static properties of nucleon. In this calculation we have treated the gluon and the pion fields perturbatively. It is found that the neutron charge rms radius and the pion-nucleon coupling constant are almost insensitive to the parameters used and are in excellent agreement with the experimental values. For better fitting the proton charge rms radius, nucleon magnetic moments and axial coupling constant prefer large quark masses (~100 MeV) and small glueball masses (<1100 MeV). The strong coupling constant is found to
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9

Pasupathy, J. "PCAC and Modifications in Hadron Properties in Nuclear Medium." Modern Physics Letters A 12, no. 26 (1997): 1943–49. http://dx.doi.org/10.1142/s0217732397001989.

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It is known that the Adler zero condition when imposed on pion amplitudes leads to several relations between hadron masses through the dual resonance formula of Lovelace, Shapiro and Veneziano. In particular the Lovelace quantization condition leads to the relation [Formula: see text] which is well satisfied experimentally. The Regge slope parameter α′ can be related to the gluon condensate. The latter is modified in the nuclear medium as compared to its value in the QCD vacuum. Combining the PCAC hypothesis with changes in gluon condensate leads to lowering of vector masses in the nuclear med
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10

Sasaki, Chihiro, David Blaschke, Pok Man Lo, Michał Marczenko, Kenji Morita, and Krzysztof Redlich. "Parity Doubling in QCD Thermodynamics." Proceedings 13, no. 1 (2019): 7. http://dx.doi.org/10.3390/proceedings2019013007.

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Motivated by the recent lattice study by FASTSUM collaboration, effective masses of the baryon parity-doublers are shown for various pion masses. A general trend of the nucleon and delta parity-doublers is consistent with the lattice Quantum Chromodynamics (QCD) observation, whereas the hyperon masses exhibit a qualitatively different behavior, traced back to the lattice set-up with the heavy pion comparable to the kaon. As an application to hot QCD, we demonstrate the fluctuations and correlations involving baryon number in hot hadronic matter with modified masses of negative-parity baryons,
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