Roxanne P. Springer

Journal Article Physical Review C · October 1, 2023 We calculate the cold neutron-deuteron (nd) capture cross section,σnd to next-to-next-to leading order (NNLO) using the model-independent approach of pionless effective-field theory [EFT(π)]. At leading order we find σnd=0.314±0.217 mb, while the experimen ... Full text Cite

Implications of Large-N QCD for the NN Interaction

Journal Article Annual Review of Nuclear and Particle Science · September 25, 2023 We present a method for ordering two-nucleon interactions based upon their scaling with the number of QCD colors, Nc, in the limit that Nc becomes large. Available data in the two-nucleon sector show general agreement with this ordering, indicating that th ... Full text Cite

Nuclear Forces for Precision Nuclear Physics: A Collection of Perspectives

Journal Article Few-Body Systems · December 1, 2022 This is a collection of perspective pieces contributed by the participants of the Institute for Nuclear Theory’s Program on Nuclear Physics for Precision Nuclear Physics which was held virtually from April 19 to May 7, 2021. The collection represents the r ... Full text Cite

International Workshop on Next Generation Gamma-Ray Source

Journal Article Journal of Physics G: Nuclear and Particle Physics · December 2, 2021 Link to item Cite

The possible role of the large-N $_{c}$ limit in understanding nuclear forces from QCD

Other · June 2021 Cite

Large- Nc and renormalization group constraints on parity-violating low-energy coefficients for three-derivative operators in pionless effective field theory

Journal Article Physical Review C · May 1, 2021 We extend, from operators with one derivative to operators with three derivatives, the analysis of two-body hadronic parity violation in a combined pionless effective field theory (EFTπ/) and large-Nc expansion, where Nc is the number of colors in quantum ... Full text Cite

Large- Nc analysis of two-nucleon neutrinoless double- β decay and charge-independence-breaking contact terms

Journal Article Physical Review C · May 1, 2021 The interpretation of experiments that search for neutrinoless double-β decay relies on input from nuclear theory. Cirigliano et al. [Phys. Rev. Lett. 120, 202001 (2018)PRLTAO0031-900710.1103/PhysRevLett.120.202001] recently showed that, for the light Majo ... Full text Cite

A Precise Parity-Violation Measurement in Light Nuclei

Journal Article Physics · September 23, 2020 Full text Cite

Editorial: RMP: Looking Forward

Journal Article Reviews of Modern Physics · July 1, 2019 Full text Cite

Large-Nc relationships among two-derivative pionless effective field theory couplings

Journal Article Physical Review C · October 12, 2018 We analyze two-derivative two-nucleon interactions in a combined pionless effective field theory and large-Nc expansion. At leading order in the large-Nc expansion, relationships among low-energy constants emerge. We find these to be consistent with experi ... Full text Cite

Erratum: Large-Nc limit reduces the number of independent few-body parity-violating low-energy constants in pionless effective field theory (Physical Review C (2016) 93 (025502) DOI: 10.1103/PhysRevC.93.025502)

Journal Article Physical Review C · May 8, 2018 There are instances of a missing sin2θW where we discuss the isotensor terms. Reference [1] is also missing this factor. The corrections are as follows: Eq. (9), (Formula Presented). scales as O (c) sin2 θ W, while Eqs. (18) and (19), (Formula Presented). ... Full text Cite

Nd scattering and the Ay puzzle to next-to-next-to-next-to-leading order

Journal Article Physical Review C · May 2, 2016 Polarization observables in neutron-deuteron scattering are calculated to next-to-next-to-next-to-leading order (N3LO) in pionless effective field theory (EFT¬π). At N3LO the two-body P-wave contact interactions are found to be important contributions to t ... Full text Cite

Non-relativistic Neutron Deuteron Scattering

Conference EPJ Web of Conferences · March 25, 2016 We discuss the calculation of polarization observables, including Ay, in nd scattering to next-to-next-to-next-to-leading order in pionless effective field theory. ... Full text Cite

Large- Nc limit reduces the number of independent few-body parity-violating low-energy constants in pionless effective field theory

Journal Article Physical Review C · February 19, 2016 The symmetries of the standard model dictate that for very low energies, where nucleon dynamics can be described in terms of a pionless effective field theory (EFT(π/)), the leading-order parity-violating nucleon-nucleon Lagrangian contains five independen ... Full text Cite

He 3 and pd scattering to next-to-leading order in pionless effective field theory

Journal Article Physical Review C - Nuclear Physics · June 12, 2014 We study the three-body systems of He3 and pd scattering and demonstrate, both analytically and numerically, that a new pd three-body force is needed at next-to-leading order in pionless effective field theory. We also show that at leading order these obse ... Full text Cite

The theory of parity violation in few-nucleon systems

Journal Article Progress in Particle and Nuclear Physics · September 1, 2013 We review recent progress in the theoretical description of hadronic parity violation in few-nucleon systems. After introducing the different methods that have been used to study parity-violating observables we discuss the available calculations for reacti ... Full text Cite

Parity Violation in Photonuclear Reactions at HIGS -- Submission to Snowmass 2013: Intensity Frontier

Journal Article · July 30, 2013 We discuss the scientific motivation, possible experiments, and beam requirements for measurements of parity violation in photonuclear reactions at an intensity upgraded HIGS facility, HIGS2. ... Link to item Cite

Using the decay ψ(4160)→X(3872)γ to probe the molecular content of the X(3872)

Journal Article Physical Review D - Particles, Fields, Gravitation and Cosmology · July 15, 2013 The X(3872) has non-charmonium-like properties, such as decay processes that seem to violate isospin, and a mass that lies unexpectedly close to the D0 D̄0* threshold. An effective field theory that includes both charmoniumlike (short-distance) and molecule ... Full text Cite

Parity-violating neutron spin rotation in hydrogen and deuterium

Journal Article The European Physical Journal A · January 2012 Full text Cite

Radiative decays X(3872)→ψ(2S)γ and ψ(4040)→X(3872) γ in effective field theory

Journal Article Physical Review D - Particles, Fields, Gravitation and Cosmology · May 5, 2011 Heavy hadron chiral perturbation theory (HHχPT) and XEFT are applied to the decays X(3872)→ψ(2S)γ and ψ(4040)→X(3872)γ under the assumption that the X(3872) is a molecular bound state of neutral charm mesons. In these decays the emitted photon energies are ... Full text Cite

Radiative Decays X(3872)->psi(2S) gamma and psi(4040) ->X(3872) gamma

Journal Article Phys. Rev. D · January 1, 2011 Cite

X(3872) -> psi(2S) gamma and psi(4040) -> X(3872) gamma

Journal Article Phys Rev D83 094009 · 2011 Cite

Two parity-violating asymmetries from np → dγ in pionless effective field theories

Journal Article Nuclear Physics A · November 1, 2010 We consider parity-violating observables from the processes n→p→dγ and np → dγ. We perform calculations using pionless effective field theory both with and without explicit dibaryon fields. After combining these results with ones we have already obtained o ... Full text Cite

Parity violation in the NN system

Conference EPJ Web of Conferences · January 1, 2010 We briefly review the apparent experimental discrepancies that sustain interest in the field of lowenergy few-nucleon parity violation. We argue that it is not possible to determine whether present experimental measurements are consistent unless each is un ... Full text Cite

Can fermions save large N dimensional reduction?

Journal Article Journal of High Energy Physics · November 11, 2009 This paper explores whether Eguchi-Kawai reduction for gauge theories with adjoint fermions is valid. The Eguchi-Kawai reduction relates gauge theories in different numbers of dimensions in the large N limit provided that certain conditions are met. In pri ... Full text Cite

Scattering of D and D* mesons off the X(3872)

Journal Article Physical Review D - Particles, Fields, Gravitation and Cosmology · August 6, 2009 Both the mass (just below the D*0D̄0 threshold) and the likely quantum numbers (JPC=1++) of the X(3872) suggest that it is either a weakly bound hadronic "molecule" (X(3872)∼1/2[D*0D̄0+D̄*0D0]) or a virtual state of charmed mesons. Assuming the X(3872) is a w ... Full text Cite

An effective-field-theory analysis of low-energy parity-violation in nucleon-nucleon scattering

Journal Article Nuclear Physics A · May 1, 2009 We analyze parity-violating nucleon-nucleon scattering at energies E < mπ2 / M using the effective field theory appropriate for this regime. The minimal Lagrangian for short-range parity-violating NN interactions is written in an operator basis that encode ... Full text Cite

HHChPT applied to the charmed-strange parity partners

Journal Article Chiral Dynamics 2006 - Proceedings of the 5th International Workshop on Chiral Dynamics, Theory and Experiment, CD 2006 · January 1, 2007 We apply heavy hadron chiral perturbation theory (HHChPT) to study the properties of the even- and odd-parity charmed-strange mesons. We find that the experimental masses and electromagnetic decay rates are consistent with HHChPT.We consider the hypothesis ... Full text Cite

Even- and odd-parity charmed meson masses in heavy hadron chiral perturbation theory

Journal Article Physical Review D - Particles, Fields, Gravitation and Cosmology · August 1, 2005 We derive mass formulas for the ground state, JP=0- and 1-, and first excited even-parity, JP=0+ and 1+, charmed mesons including one-loop chiral corrections and O(1/mc) counterterms in heavy hadron chiral perturbation theory. We show that including these ... Full text Cite

Even- and Odd-Parity Charmed Meson Masses in Heavy Hadron Chiral Perturbation Theory

Journal Article Phys Rev D · March 2005 Cite

Heavy-quark symmetry and the electromagnetic decays of excited charmed strange mesons

Journal Article Physical Review D - Particles, Fields, Gravitation and Cosmology · 2004 Heavy-hadron chiral perturbation theory (HHχPT) is applied to the decays of the even-parity charmed strange mesons, Ds0(2317) and Ds1(2460). Heavy-quark spin-symmetry predicts the branching fractions for the three electromagnetic decays of these states to ... Full text Cite

SU(3) predictions for weak decays of doubly heavy baryons, including SU(3) breaking terms

Journal Article Physical Review D - Particles, Fields, Gravitation and Cosmology · January 1, 2003 We find expressions for the weak decay amplitudes of baryons containing two b quarks (or one b and one c quark—many relationships are the same) in terms of unknown reduced matrix elements. This project was originally motivated by the request of the Fermila ... Full text Cite

The anapole form factor of the deuteron

Journal Article Nuclear Physics A · April 9, 2001 We find the leading-order result for the anapole form factor of the deuteron using effective field theory. The momentum dependence of the anapole form factor is different from that of the matrix element of the strange currents in the deuteron, which may pr ... Full text Cite

An effective field theory calculation of the parity violating asymmetry in n^→ + p > d + γ

Journal Article Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics · January 1, 1999 Weak interactions are expected to induce a parity violating pion-nucleon coupling, hπNN(1). This coupling should be measurable in a proposed experiment to study the parity violating asymmetry Aγ in the process n→ + p → d + γ. We compute the leading depende ... Full text Cite

Heavy baryon chiral perturbation theory and the weak nonleptonic p-wave decays of the baryon octet

Journal Article Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics · January 1, 1999 Considerable confusion in the literature about heavy baryon chiral perturbation theory, its convergence properties, and appropriate calculational techniques, make it timely to discuss the nonleptonic p-wave decays of the octet of baryons. We present model ... Full text Cite

Weak nonleptonic Ω^- decay in chiral perturbation theory

Journal Article Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics · January 1, 1999 We calculate the weak nonleptonic decay of the Ω- baryon to octet final states in heavy baryon chiral perturbation theory (HBChPT). We include the one-loop leading logarithmic effects and show that this improves the universality of the HBChPT constants. © ... Full text Cite

Weak Nonleptonic Omega Decay in Chiral Perturbation Theory

Journal Article Physics Letters · October 1998 Cite

Gamma-Deuteron Compton Scattering in Effective Field Theory

Journal Article Nuclear Physics · October 1998 Cite

NNK and ΛΛK amplitudes in chiral perturbation theory

Journal Article Nuclear Physics A · August 24, 1998 We explore the S-wave and P-wave amplitudes for NNK and ΛΛK interactions using chiral perturbation theory to script O sign(ms log ms). In contrast to the large corrections found in P-wave amplitudes in the nonleptonic decay of octet baryons, the NNK amplit ... Full text Cite

NMK and ΛΛK amplitudes in chiral perturbation theory

Conference Nuclear Physics A · August 1998 Full text Cite

The Polarizability of the Deuteron

Journal Article Nuclear Physics · July 1998 Cite

Parity violation in effective field theory and the deuteron anapole moment

Journal Article Nuclear Physics A · January 1, 1998 Effective field theory, including pions, provides a consistent and systematic description of nucleon-nucleon strong interactions up to center-of-mass momentum p ∼ 300 MeV per nucleon. We describe the inclusion of hadronic parity violation into this effecti ... Full text Cite

Weak ΛΛK⁰ interaction

Journal Article Physical Review C - Nuclear Physics · 1998 We calculate the leading contribution to the weak ΛΛK coupling in heavy baryon chiral perturbation theory, including the SU(3) breaking terms arising at one loop. This coupling gives the leading one-boson exchange amplitude for the process ΛΛ → Λn and is a ... Cite

γ-deuteron Compton scattering in effective field theory

Journal Article Nuclear Physics A · January 1, 1998 The differential cross section for γ-deuteron Compton scattering is computed to next-to-leading order (NLO) in an effective field theory that describes nucleon-nucleon interactions below the pion production threshold. Contributions at NLO include the nucle ... Full text Cite

Weak [Formula Presented] interaction

Journal Article Physical Review C - Nuclear Physics · January 1, 1998 We calculate the leading contribution to the weak [Formula Presented] coupling in heavy baryon chiral perturbation theory, including the SU(3) breaking terms arising at one loop. This coupling gives the leading one-boson exchange amplitude for the process ... Full text Cite

Kaon-nucleon couplings for weak decays of hypernuclei (vol C53, pg 441, 1996)

Journal Article Physical Review C · November 1996 Cite

Effective Lagrangians and parity-conserving time-reversal violation at low energies.

Journal Article Physical review. D, Particles and fields · May 1996 Full text Cite

Kaon-nucleon couplings for weak decays of hypernuclei.

Journal Article Physical review. C, Nuclear physics · January 1996 Full text Cite

Hyperon Decays in Chiral Perturbation Theory Revisited

Journal Article · August 18, 1995 The discrepancies found between S-wave and P-wave fits for hyperon decays are reinvestigated using the heavy baryon chiral Lagrangian formalism. The agreement is found to improve through the inclusion of previously omitted diagrams. The S-waves are unaff ... Link to item Cite

Electromagnetic moments of the baryon decuplet.

Journal Article Physical review. D, Particles and fields · April 1994 Full text Cite

Erratum and addendum to E2/M1 mixing ratio of Δ→Nγ and hyperon resonance radiative decay

Journal Article Physics Letters B · September 9, 1993 We correct an error in the definition of our amplitudes, and then discuss using γ-γ correlations to find the ratio of electric quadrupole to magnetic dipole transitions in the electromagnetic production and decay of the Δ. © 1993. ... Full text Cite

Probing hadronic structure with the decay Delta -->Nl+l-

Journal Article Physical review. C, Nuclear physics · August 1993 Full text Cite

Strong and electromagnetic decays of the baryon decuplet

Journal Article Nuclear Physics, Section B · June 28, 1993 To explore further the role that QCD symmetries play on hadron dynamics, we discuss the radiative decay of the baryon decuplet to the baryon octet and compute the leading non-analytic SU(3) violating corrections induced at the one-loop level. In the limit ... Full text Cite

E2 M1 mixing ratio of Δ→Nγ and hyperon resonance radiative decay

Journal Article Physics Letters B · April 29, 1993 We complete the leading contribution to the E2 M1 mixing ratio of the decay Δ→Nγ in heavy baryon chiral perturbation theory. We find the mixing ratio to be 4%{less-than or approximate}|δ E2 M1|{less-than or approximate}11%, much larger than estimates based ... Full text Cite

Low energy effective hamiltonian for ΔI = 1 nuclear parity violation and nucleonic strangeness

Journal Article Physics Letters B · November 21, 1991 We calculate the low energy effective hamiltonian for isovector (ΔI = 1) nuclear parity violation, including the effects of heavy quarks s, c and b. At the hadronic scale, the hamiltonian contains four-quark operators of the u, d, and s quarks whose coeffi ... Full text Cite

Very charming baryons

Journal Article International Journal Of Modern Physics A · April 1991 Cite

Strong-interaction effects in weak radiative B-meson decay

Journal Article Nuclear Physics, Section B · July 30, 1990 Strong-interaction corrections to the effective hamiltonian for weak radiative B-meson decay (i.e., B → Xsγ, where Xs denotes a strange hadronic final state) are calculated using the leading logarithmic approximation. The inclusive rate for decays B → Xsγ, ... Full text Cite

SU(3) predictions for charmed-baryon decays

Journal Article Physical Review D · January 1, 1990 The charmed baryons c+, źc1+, źc10 and ©c0 can only weakly decay to lower-mass baryons and mesons. We derive relations between the decay rates of these particles based on flavor SU(3). Two-body and three-body nonleptonic decays are explored along with semi ... Full text Cite

Effective hamiltonian for weak radiative B-meson decay

Journal Article Physics Letters B · February 25, 1988 The inclusive rate for decay of a B-meson to a hard photon and strange hadronic final states (i.e., B→γXs with Xs=K*, etc.), is likely to be dominated by short-distance physics which gives rise to an effective hamiltonian that is a magnetic-moment-type ope ... Full text Cite