<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:msup><mml:mi>π</mml:mi><mml:mo>±</mml:mo></mml:msup><mml:mi>p</mml:mi></mml:math> differential cross sections at low energies

We present results from a comprehensive partial-wave analysis of π ± p elastic scattering and charge-exchange data, covering the region from threshold to 2.6 GeV in the lab pion kinetic energy, employing a coupled-channel formalism to simultaneously fit π − p → ηn data to 0.8 GeV. Our main result, solution SP06, utilizes a complete set of forward and fixed-t dispersion relation constraints applied to the πN elastic amplitude. The results of these analyses are compared with previous solutions in terms of their resonance spectra and preferred values for couplings and low-energy parameters.

show abstract

“…• [15] and have allowed us to extend our single-energy fits to very low energies (20 MeV) for the first time (see Table II). …”

Section: Databasementioning

confidence: 97%

Extended partial-wave analysis ofπNscattering data

Arndt¹,

Briscoe²,

Strakovsky³

et al. 2006

Phys. Rev. C

477

786

View full text Add to dashboard Cite

show abstract

“…Since the data base for the elastic channels is dominated by [58], we also performed fits excluding these data sets, with results shown in the third panel of Table 2 (for both channels [58] accounts for more than half the data points, 274/464 and 121/180 for π ± p). The pull from the full data base amounts to 1.4σ and 1.1σ for the π + p and π − p channel, respectively, and especially given that the statistical errors for the reduced fit set should be inflated due to the increased χ 2 , we conclude that the results for the full and reduced data base are compatible even within statistical errors only, both for the scattering lengths and the normalizations, while possible inconsistencies between the data sets do not become relevant at the level of accuracy for the scattering lengths that we are claiming here.…”

Section: Page 8 Of 17 Author Submitted Manuscript -Jphysg-101976r3mentioning

confidence: 99%

Extracting the σ-term from low-energy pion-nucleon scattering

Elvira

Hoferichter

Kubis³

et al. 2017

J. Phys. G: Nucl. Part. Phys.

View full text Add to dashboard Cite

Abstract. We present an extraction of the pion-nucleon (πN ) scattering lengths from low-energy πN scattering, by fitting a representation based on RoySteiner equations to the low-energy data base. We show that the resulting values confirm the scattering-length determination from pionic atoms, and discuss the stability of the fit results regarding electromagnetic corrections and experimental normalization uncertainties in detail. Our results provide further evidence for a large πN σ-term, σ πN = 58(5) MeV, in agreement with, albeit less precise than, the determination from pionic atoms.

show abstract

“…In a recent paper [68], the differential elastic π-N scattering cross sections [109] measured with the CHAOS detector at TRIUMF [110] were employed to derive a new determination of the Σ πN term, Σ πN = 43 ± 12 MeV, where the error bar is mostly due to the experimental uncertainties. Figure 3: The spin-independent neutralino-proton scattering cross section versus the pion-nucleon Σ term for three p9MSSM points (shown in Table 3), characterised by their neutralino composition: the dash-dotted blue line shows a point corresponding to mixed neutralino, the solid red line to a higgsino-like neutralino, and the dashed green line to a gaugino-like neutralino.…”

Section: Xenon100 Likelihoodmentioning

confidence: 99%

Dark matter and collider signatures of the MSSM

et al. 2013

View full text Add to dashboard Cite

We explore the MSSM with 9 free parameters (p9MSSM) that have been selected as a minimum set that allows an investigation of neutralino dark matter and collider signatures while maintaining consistency with several constraints. These include measurement of the dark matter relic density from PLANCK, main properties of the discovered Higgs boson, LHC direct SUSY searches, recent evidence for a Standard Model-like BR (B s → µ + µ − ), and the measurement of δ (g − 2) µ , plus a number of other electroweak and flavor physics constraints. We perform a simulation of two LHC direct SUSY searches at √ s = 8 TeV: the CMS inclusive α T search for squarks and gluinos and the CMS electroweak production search with 3l+E miss T in the final state. We use the latter to identify the regions of the parameter space, consistent at 2σ with δ (g − 2) µ , that are not excluded by the direct limits from the electroweak production. We find that they correspond to a neutralino mass in the window 200 GeV m χ 500 GeV. We also implement the likelihood for the XENON100 exclusion bound, in which we consider for the first time the impact of a recent determination of the Σ πN term from CHAOS data, Σ πN = 43 ± 12 MeV. We show that in light of this measurement, the present statistical impact of the XENON100 bound is greatly reduced, although future sensitivities of the LUX and XENON1T experiments will have decisive impact on the mixed bino/higgsino composition of the neutralino. We point out some tension between the constraints from δ (g − 2) µ and XENON100. Finally, we present prospects for various indirect searches of dark matter, namely γ-ray fluxes from dSphs and the Galactic Center at Fermi-LAT, and the positron flux at AMS02. We also show the 5-year sensitivity on the spin-dependent neutralino-proton cross section due to neutrino fluxes from the Sun at IceCube. * On leave of absence from the University of Sheffield, U.K.

show abstract

π±p differential cross sections at low energies

Cited by 20 publications

References 33 publications

Extended partial-wave analysis ofπNscattering data

Extended partial-wave analysis ofπNscattering data

Extracting the σ-term from low-energy pion-nucleon scattering

Dark matter and collider signatures of the MSSM

Contact Info

Product

Resources

About