Nuclear Theory·nucl-th

Thursday·December 16, 2021

13 papers—7 primary·6 cross-listed

08
[Submitted on 14 Dec 2021] (cross-list from hep-ph)
Factorization for Azimuthal Asymmetries in SIDIS at Next-to-Leading Power
Markus A. Ebert🇩🇪 · Anjie Gao🇺🇸 · Iain W. Stewart🇺🇸
Differential measurements of the semi-inclusive deep inelastic scattering (SIDIS) process with polarized beams provide important information on the three-dimensional structure of hadrons. Among the various observables are azimuthal asymmetries that start at subleading power, and which give access to novel transverse momentum dependent distributions (TMDs). Theoretical predictions for these distributions are currently based on the parton model rather than a rigorous factorization based analysis. Working under the assumption that leading power Glauber interactions do not spoil factorization at this order, we use the Soft Collinear Effective Theory to derive a complete factorization formula for power suppressed hard scattering effects in SIDIS. This yields generalized definitions of the TMDs that depend on two longitudinal momentum fractions (one of them only relevant beyond tree level), and a complete proof that only the same leading power soft function appears and can be absorbed into the TMD distributions at this order. We also show that perturbative corrections can be accounted for with only one new hard coefficient. Factorization formulae are given for all spin dependent structure functions which start at next-to-leading power. Prospects for improved subleading power predictions that include resummation are discussed.
Comments:
118 pages, 1 figure; Update fixing typos and with complex C^(1) [JHEP erratum version]
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2112.07680 [pdf]
JHEP(2022)·58 citations
09
[Submitted on 14 Dec 2021] (cross-list from cond-mat.quant-gas)
Toward an automated-algebra framework for high orders in the virial expansion of quantum matter
Aleks J. Czejdo · Joaquin E. Drut · Yaqi Hou · Kaitlyn J. Morrell
The virial expansion provides a non-perturbative view into the thermodynamics of quantum many-body systems in dilute regimes. While powerful, the expansion is challenging as calculating its coefficients at each order $n$ requires analyzing (if not solving) the quantum $n$ -body problem. In this work, we present a comprehensive review of automated algebra methods, which we developed to calculate high-order virial coefficients. The methods are computational but non-stochastic, thus avoiding statistical effects; they are also for the most part analytic, not numerical, and amenable to massively parallel computer architectures. We show formalism and results for coefficients characterizing the thermodynamics (pressure, density, energy, static susceptibilities) of homogeneous and harmonically trapped systems, and explain how to generalize them to other observables such as the momentum distribution, Tan's contact, and the structure factor.
Comments:
25 pages, 4 figures; Updated Fig. 2 to show comparison with the results of Endo and Castin at finite trapping frequency
Subjects:
Quantum Gases (cond-mat.quant-gas); Statistical Mechanics (cond-mat.stat-mech); Nuclear Theory (nucl-th)
arXiv:
2112.07744 [pdf]
Condens.Mat.(2022)·2 citations
10
[Submitted on 14 Dec 2021] (cross-list from hep-ph)
Jet Charge: A new tool to probe the anomalous $Z b b ˉ$ couplings at the EIC
Hai Tao Li🇨🇳 · Bin Yan🇺🇸 · C.-P. Yuan🇺🇸
We propose to utilize the average jet charge weighted single-spin asymmetry $A_{e}^{b Q}$ in the neutral current DIS scattering with one $b$ -tagged jet produced at the EIC to probe the $Z b b ˉ$ interactions. This novel observable is sensitive to the axial-vector component of the $Z b b ˉ$ coupling and is complementary to the single-spin asymmetry measurement at the EIC and the $g g \to Z h$ cross section measurement at the HL-LHC in the determination of the $Z b b ˉ$ couplings. We show that the apparent degeneracy of the $Z b b ˉ$ couplings, implied by the LEP and SLC precision electroweak data, can be broken by the $A_{e}^{b Q}$ measurement at the EIC. With a large enough integrated luminosity collected at the EIC, the measurement of $A_{e}^{b Q}$ could also resolve the long-standing discrepancy of $A_{FB}^{b}$ at the LEP, strongly dependent on the $b$ -tagging efficiency.
Comments:
6 pages, 4 figures, published version
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2112.07747 [pdf]
PLB(2022)·37 citations
11
[Submitted on 15 Dec 2021] (cross-list from hep-lat)
Aspects of finite temperature QCD towards the chiral limit
Anirban Lahiri🇩🇪
QCD under extreme conditions has been studied for a long time, and the chiral limit has been a grey area mostly. In this write-up of my talk, I review some of the recent developments made by the community to unveil various features of QCD towards the chiral limit, which includes calculation of the chiral critical temperature and determination of the order of chiral phase transition for various numbers of flavors. Acknowledging the importance of the studies regarding the effective restoration of $U_{A} (1)$ , I try to give a comprehensive overview about the various studies done in the last few years in a comparative manner to realize the current status of the community in this regard. I also discuss very recent efforts about the relevance of various energy-like observables w.r.t. the chiral phase transition.
Comments:
Write-up corresponding to my topical plenary talk in The 38th International Symposium on Lattice Field Theory, LATTICE2021 held in cyberspace organized by MIT, USA. 1 (cover) + 18 (main text) + 5 (references) pages
Subjects:
High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2112.08164 [pdf]
PoS(2022)·30 citations
12
[Submitted on 15 Dec 2021] (cross-list from hep-ph)
Quantum field theoretical structure of electrical conductivity of cold and dense fermionic matter in the presence of a magnetic field
Sarthak Satapathy🇮🇳 · Snigdha Ghosh🇮🇳 · Sabyasachi Ghosh🇮🇳
We have gone through a detailed calculation of the two-point correlation function of vector currents at finite density and magnetic field by employing the real time formalism of finite temperature field theory and Schwinger's proper time formalism. With respect to the direction of external magnetic field, the parallel and perpendicular components of electric conductivity for the degenerate relativistic fermionic matter are obtained from the zero momentum limit of the current-current correlator, owing to Kubo formula. Our quantum field theoretical expressions and numerical estimations are compared with the same, obtained from the relaxation time approximation methods of kinetic theory and its Landau quantized extension, which may be called as classical and quantum results respectively. All the results are merged in the classical domain i.e. high density and low magnetic field region but in the remaining (quantum) domain, quantum results carry a quantized information like Shubnikov-de Haas oscillation along density and magnetic field axes. We have obtained completely new quantum field theoretical expression for perpendicular conductivity of degenerate relativistic fermionic matter. Interestingly, our quantum field theoretical calculation provide a new mathematical form of cyclotron frequency with respect to its classical definition, which might require more future research to interpret the phenomena.
Comments:
Version published in Physical Review D
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2112.08236 [pdf]
PRD(2022)·18 citations
13
[Submitted on 15 Dec 2021] (cross-list from hep-ph)
Soft photon bremsstrahlung at next-to-leading power
Domenico Bonocore🇩🇪 · Anna Kulesza🇩🇪
The emission of soft radiation provides a fundamental probe of the consistency of the underlying quantum field theory. Correspondingly, the measurement of the soft photon bremsstrahlung, such as the one proposed with the planned future upgrade of the ALICE experiment at the LHC, is of great interest. In this letter we explore the possibility to implement analytic techniques that have been recently developed for soft gluon resummation at Next-to-Leading-Power (NLP) in the context of the soft photon spectrum. We provide a formula for the differential cross-section with shifted kinematics that is particularly suitable for numerical implementations. We also discuss the impact of loop corrections to Low's theorem due to radiative jet functions.
Comments:
17 pages, 2 figures. Version published in PLB. Arguments and results unchanged. Corrected typos. Added references
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2112.08329 [pdf]
PLB(2022)·20 citations

Affiliations

first authorsco-authorsvia INSPIRE

Factorization for Azimuthal Asymmetries in SIDIS at Next-to-Leading Power

Toward an automated-algebra framework for high orders in the virial expansion of quantum matter

Jet Charge: A new tool to probe the anomalous Zbbˉ couplings at the EIC

Aspects of finite temperature QCD towards the chiral limit

Quantum field theoretical structure of electrical conductivity of cold and dense fermionic matter in the presence of a magnetic field

Soft photon bremsstrahlung at next-to-leading power

Affiliations

Jet Charge: A new tool to probe the anomalous $Z b b ˉ$ couplings at the EIC