Four-pion production in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>τ</mml:mi></mml:math>decays and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>e</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>e</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math>annihilation: An update

Czyż, Henryk; Kühn, Johann H.; Wapienik, Agnieszka

doi:10.1103/physrevd.77.114005

Cited by 49 publications

(69 citation statements)

References 32 publications

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“…2, we compare the spectrum of gamma-rays predicted in this model to the spectrum from the Galactic 3 The branching fractions of a particle decaying through kinetic mixing with the photon can be determined using the measurements compiled at http://durpdg.dur.ac.uk/hepdata/online/rsig/index.html. The photon spectrum has been calculated based the effective Lagrangian approach and chiral perturbation theory [44].…”

Section: Fig 1: Uppermentioning

confidence: 99%

Dark forces and light dark matter

2012

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We consider a simple class of models in which the dark matter, X, is coupled to a new gauge boson, φ, with a relatively low mass (m φ ∼ 100 MeV − 3 GeV). Neither the dark matter nor the new gauge boson have tree-level couplings to the Standard Model. The dark matter in this model annihilates to φ pairs, and for a coupling of gX ≈ 0.06 × (mX /10 GeV) 1/2 yields a thermal relic abundance consistent with the cosmological density of dark matter. The φ's produced in such annihilations decay through a small degree of kinetic mixing with the photon to combinations of Standard Model leptons and mesons. For dark matter with a mass of ∼10 GeV, the shape of the resulting gamma-ray spectrum provides a good fit to that observed from the Galactic Center, and can also provide the very hard electron spectrum required to account for the observed synchrotron emission from the Milky Way's radio filaments. For kinetic mixing near the level naively expected from loop-suppressed operators ( ∼ 10 −4 ), the dark matter is predicted to scatter elastically with protons with a cross section consistent with that required to accommodate the signals reported by DAMA/LIBRA, CoGeNT and CRESST-II.PACS numbers: 95.35.+d; FERMILAB-PUB-12-XXX

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Section: Fig 1: Uppermentioning

confidence: 99%

Dark forces and light dark matter

2012

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“…The radiator function W (s, x, C * ), which describes the probability for the emission of an ISR photon in the polar angle range | cos θ * γ | < C * , is determined to next-toleading order (NLO) ISR with the PHOKHARA software package [16]. θ * is the angle of the emitted γ with respect to the direction of the incoming e − .…”

Section: Introductionmentioning

confidence: 99%

Initial-state radiation measurement of thee+e−→π+π−π+π−cross section

Lees¹,

Poireau²,

Tisserand³

et al. 2012

Phys. Rev. D

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We study the process e + e − → π + π − π + π − γ, with a photon emitted from the initial-state electron or positron, using 454.3 fb −1 of data collected with the BABAR detector at SLAC, corresponding to approximately 260 000 signal events. We use these data to extract the non-radiative σ(e + e − → π + π − π + π − ) cross section in the energy range from 0.6 to 4.5 GeV. The total uncertainty of the cross section measurement in the peak region is less than 3%, higher in precision than the corresponding results obtained from energy scan data.

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“…The AfkQed generator used in combination with the detector simulation contains corrections for NLO-ISR collinear to the beam as well as FSR corrections implemented by PHOTOS [18]. The NLO-ISR correction is calculated by comparing the generator with PHOKHARA [8], which includes the full ISR contributions up to NLO. An effect of (0.8 AE 0.1 stat AE 0.5 syst )%, constant in Mðπ þ π − 2π 0 Þ, is observed and subsequently corrected for.…”

Section: Cross Sectionmentioning

confidence: 99%

“…PHOKHARA [8,9], an event generator for ISR processes that includes the full NLO matrix elements, is used to cross-check the signal simulation and account for nextto-leading order ISR. Final-state radiation is simulated using PHOTOS [18].…”

Section: The Babar Detector and Data Setmentioning

confidence: 99%

“…The variable s is the square of the CM energy of the experiment, x ¼ 2E Ã γ ffi ffi s p , E Ã γ is the CM energy of the ISR photon, and M ¼ ffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi ð1 − xÞs p is the invariant mass of the hadronic final state, equivalent to the effective CM energy E CM of the hadronic system. The radiator function Wðs; x; CÞ describes the probability at the squared CM energy s for an ISR photon of energy E Ã γ to be emitted in the polar angle range j cos θ Ã γ j < C. It is calculated to leading order in a closed form expression [7], while next-to-leading order (NLO) effects are accounted for by simulation using PHOKHARA [8,9]. This paper is structured as follows: in Sec.…”

Section: Introductionmentioning

confidence: 99%

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Measurement of the e+e−→π+π−π0π0 cross section using initial

Lees¹,

Poireau²,

Tisserand³

et al. 2017

Phys. Rev. D

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The process e þ e − → π þ π − 2π 0 γ is investigated by means of the initial-state radiation technique, where a photon is emitted from the incoming electron or positron. Using 454.3 fb −1 of data collected around a centerof-mass energy of ffiffi ffi s p ¼ 10.58 GeV by the BABAR experiment at SLAC, approximately 150000 signal events are obtained. The corresponding nonradiative cross section is measured with a relative uncertainty of 3.6% in the energy region around 1.5 GeV, surpassing all existing measurements in precision. Using this new result, the channel's contribution to the leading order hadronic vacuum polarization contribution to the anomalous magnetic moment of the muon is calculated as ðg π þ π − 2π 0 μ − 2Þ=2 ¼ ð17.9 AE 0.1 stat AE 0.6 syst Þ × 10 −10 in the energy range 0.85 GeV < E CM < 1.8 GeV. In the same energy range, the impact on the running of the fine-structure constant at the Z 0 -pole is determined as Δα π þ π − 2π 0 ðM 2 Z Þ ¼ ð4.44 AE 0.02 stat AE 0.14 syst Þ × 10 −4 . Furthermore, intermediate resonances are studied and especially the cross section of the process e þ e − → ωπ 0 → π þ π − 2π 0 is measured.

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Four-pion production inτdecays ande+e−annihilation: An update

Cited by 49 publications

References 32 publications

Dark forces and light dark matter

Dark forces and light dark matter

Initial-state radiation measurement of thee+e−→π+π−π+π−cross section

Measurement of the e+e−→π+π−π0π0 cross section using initial

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