Vincenzo Cirigliano - Academia.edu (original) (raw)
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Papers by Vincenzo Cirigliano
Physical Review Letters, 2009
Physical Review Letters, 2008
A proposal will be presented for a new experiment, which has been developed with Los Alamos Natio... more A proposal will be presented for a new experiment, which has been developed with Los Alamos National Laboratory LDRD funding, to measure the neutron lifetime using ultracold neutrons in a magneto-gravitational trap. In the proposed experiment, an asymmetric bowl-shaped Halbach array of permanent magnets provides the levitating and laterally confining magnetic field for ultracold neutrons produced by the Los Alamos solid deuterium source. Quasi-trapped orbits, in which relatively fast neutrons may escape during the measurement period, are suppressed by the asymmetry of the bowl and small-scale field variations designed into the magnet array. Progress on the construction of the prototype apparatus will be described.
Phys Lett B, 2011
We discuss the size of isospin violating effects of both electromagnetic (e≠0) and strong (mu≠md)... more We discuss the size of isospin violating effects of both electromagnetic (e≠0) and strong (mu≠md) origin in Pℓ2(γ) decays. Our results are relevant for the extraction of |Vus/Vud| from the measured ratio of the Kμ2(γ) and πμ2(γ) decay widths combined with FK/Fπ obtained in lattice calculations in the isospin limit. We point out that strong isospin-breaking corrections, neglected in previous studies, enter at the same level as the electromagnetic effects. The updated value for the ratio of CKM elements reads |Vus/Vud|=0.2316(12).
Eur Phys J C, Jan 23, 2004
We present a detailed numerical study of the K e3 decays to {\cal O}(p^6, (m_d-m_u)p^2, e^2 p^2) ... more We present a detailed numerical study of the K e3 decays to {\cal O}(p^6, (m_d-m_u)p^2, e^2 p^2) in chiral perturbation theory with virtual photons and leptons. We describe the extraction of the CKM matrix element |V us | from the experimental K e3 decay parameters. We propose a consistency check of the K + e3 and K 0 e3 data that is largely insensitive to the dominating theoretical uncertainties, in particular the contributions of {\cal O}(p^6). Our analysis is highly relevant in view of the recent high statistics measurement of the K + e3 branching ratio by E865 at Brookhaven which does not indicate any significant deviation from CKM unitarity but rather a discrepancy with the present K 0 e3 data.
Within an effective field theory framework, we discuss the possibility to discriminate among diff... more Within an effective field theory framework, we discuss the possibility to discriminate among different operators that contribute to lepton flavor violating (LFV) tau decays. Correlations among decay rates in different channels are shown to provide a basic handle to unravel the origin of LFV in these processes. More information about the underlying dynamics responsible for LFV can be gathered from differential distributions in three-body decays like tau -> mu pi pi or tau -> 3 mu: these are considered in some detail. We incorporate in our analysis recent developments in the determination of the hadronic form factors for tau -> mu pi pi. Future prospects for the observation of LFV tau decays and its interpretation are also discussed.
Commun Math Phys, 1999
We construct the Euclidean Green functions for the soliton (magnetic monopole) field in the U(1)4... more We construct the Euclidean Green functions for the soliton (magnetic monopole) field in the U(1)4 Lattice Gauge Theory with Wilson action. We show that in the strong coupling regime there is monopole condensation while in the QED phase the physical Hilbert space splits into orthogonal soliton sectors labeled by integer magnetic charge.
Phys Lett B, 2000
The one-loop corrections to K->pi and K->2pi matrix elements of the electroweak penguin operator ... more The one-loop corrections to K->pi and K->2pi matrix elements of the electroweak penguin operator are calculated. General next-to-leading order relations between the K->pi and K->2pi amplitudes are obtained. The fractional shift Delta_2 = 0.27 +- 0.27 is found for the O(p^2) corrections to a recent chiral determination of <(pi pi)_{I=2}|Q_{7,8}|K^0>. We explain why the sign for Delta_2 is opposite to that expected from unitarization approaches based on the Omnes equation. We perform a background-field, heat-kernel determination of the divergent one-loop amplitudes for a general class of (V-A)x(V+A) operators.
Physical Review D, Jan 30, 2002
We extend in several respects our earlier work on O(p2) corrections to the matrix elements of the... more We extend in several respects our earlier work on O(p2) corrections to the matrix elements of the electroweak penguin operator Oewp. First, to facilitate comparison with certain lattice studies we calculate O(p2) corrections to <pi\|Oewp\|K> in the SU(3) limit of equal light quark masses. Next, we demonstrate how an apparent disagreement in the literature regarding whether higher order chiral contributions increase or decrease <(pipi)I=2\|Oewp\|K> is simply a consequence of how the leading order chiral amplitude is defined. Finally, we address an aspect of the ε'/ε problem by estimating O(p2) corrections to recent determinations of <(pipi)I=2\|Q7,8\|K> which were carried out in the chiral limit.
Phys Rev Lett, 2007
We study the ratios Re/μ(P)≡Γ(P→eν¯e[γ])/Γ(P→μν¯μ[γ]) (P=π, K) in Chiral Perturbation Theory to o... more We study the ratios Re/μ(P)≡Γ(P→eν¯e[γ])/Γ(P→μν¯μ[γ]) (P=π, K) in Chiral Perturbation Theory to order e2p4. We complement the two-loop effective theory results with a matching calculation of the counterterm, finding Re/μ(π)=(1.2352±0.0001)×10-4 and Re/μ(K)=(2.477±0.001)×10-5.
Eur Phys J C, 2004
This talk is devoted to review the status of theoretical calculations of ɛ ' / ɛ. The focus is ma... more This talk is devoted to review the status of theoretical calculations of ɛ ' / ɛ. The focus is mainly on recent developments in non-lattice approaches to hadronic matrix elements. PACS: 13.25.Es Decays of K mesons - 11.30.Er CP violation
Physical review letters, Jan 20, 2015
We present lattice QCD results on the neutron tensor charges including, for the first time, a sim... more We present lattice QCD results on the neutron tensor charges including, for the first time, a simultaneous extrapolation in the lattice spacing, volume, and light quark masses to the physical point in the continuum limit. We find that the "disconnected" contribution is smaller than the statistical error in the "connected" contribution. Our estimates in the modified minimal subtraction scheme at 2 GeV, including all systematics, are g_{T}^{d-u}=1.020(76), g_{T}^{d}=0.774(66), g_{T}^{u}=-0.233(28), and g_{T}^{s}=0.008(9). The flavor diagonal charges determine the size of the neutron electric dipole moment (EDM) induced by quark EDMs that are generated in many new scenarios of CP violation beyond the standard model. We use our results to derive model-independent bounds on the EDMs of light quarks and update the EDM phenomenology in split supersymmetry with gaugino mass unification, finding a stringent upper bound of d_{n}<4×10^{-28} e cm for the neutron EDM in t...
Abstract: Using the 1=NC expansion scheme and truncating the hadronic spectrum to the lowest-lyin... more Abstract: Using the 1=NC expansion scheme and truncating the hadronic spectrum to the lowest-lying resonances, we match a meromorphic approximation to thehSPPi Green function onto QCD by imposing the correct large-momentum fallofi, both ofi-shell and on the relevant hadron mass shells. In this way we determine a number of chiral low-energy constants of O(p,… ¡
The possibility to discriminate between different operators contributing to lepton flavour violat... more The possibility to discriminate between different operators contributing to lepton flavour violating tau decays is discussed within an effective field theory framework. Correlations among decay rates in different channels as well as differential distributions in many-body decays are considered. Recent developments in the determination of the hadronic form factors for taurightarrowellpipi\tau \rightarrow \ell \pi \pitaurightarrowellpipi ($\ell = e, \mu$) decays are incorporated in the analysis. The above issues are exemplified by considering a Higgs-like boson with lepton flavour violating couplings. Implications of the search for lepton flavour violating Higgs decays performed recently by the CMS collaboration are also discussed.
Physical Review Letters, 2009
Physical Review Letters, 2008
A proposal will be presented for a new experiment, which has been developed with Los Alamos Natio... more A proposal will be presented for a new experiment, which has been developed with Los Alamos National Laboratory LDRD funding, to measure the neutron lifetime using ultracold neutrons in a magneto-gravitational trap. In the proposed experiment, an asymmetric bowl-shaped Halbach array of permanent magnets provides the levitating and laterally confining magnetic field for ultracold neutrons produced by the Los Alamos solid deuterium source. Quasi-trapped orbits, in which relatively fast neutrons may escape during the measurement period, are suppressed by the asymmetry of the bowl and small-scale field variations designed into the magnet array. Progress on the construction of the prototype apparatus will be described.
Phys Lett B, 2011
We discuss the size of isospin violating effects of both electromagnetic (e≠0) and strong (mu≠md)... more We discuss the size of isospin violating effects of both electromagnetic (e≠0) and strong (mu≠md) origin in Pℓ2(γ) decays. Our results are relevant for the extraction of |Vus/Vud| from the measured ratio of the Kμ2(γ) and πμ2(γ) decay widths combined with FK/Fπ obtained in lattice calculations in the isospin limit. We point out that strong isospin-breaking corrections, neglected in previous studies, enter at the same level as the electromagnetic effects. The updated value for the ratio of CKM elements reads |Vus/Vud|=0.2316(12).
Eur Phys J C, Jan 23, 2004
We present a detailed numerical study of the K e3 decays to {\cal O}(p^6, (m_d-m_u)p^2, e^2 p^2) ... more We present a detailed numerical study of the K e3 decays to {\cal O}(p^6, (m_d-m_u)p^2, e^2 p^2) in chiral perturbation theory with virtual photons and leptons. We describe the extraction of the CKM matrix element |V us | from the experimental K e3 decay parameters. We propose a consistency check of the K + e3 and K 0 e3 data that is largely insensitive to the dominating theoretical uncertainties, in particular the contributions of {\cal O}(p^6). Our analysis is highly relevant in view of the recent high statistics measurement of the K + e3 branching ratio by E865 at Brookhaven which does not indicate any significant deviation from CKM unitarity but rather a discrepancy with the present K 0 e3 data.
Within an effective field theory framework, we discuss the possibility to discriminate among diff... more Within an effective field theory framework, we discuss the possibility to discriminate among different operators that contribute to lepton flavor violating (LFV) tau decays. Correlations among decay rates in different channels are shown to provide a basic handle to unravel the origin of LFV in these processes. More information about the underlying dynamics responsible for LFV can be gathered from differential distributions in three-body decays like tau -> mu pi pi or tau -> 3 mu: these are considered in some detail. We incorporate in our analysis recent developments in the determination of the hadronic form factors for tau -> mu pi pi. Future prospects for the observation of LFV tau decays and its interpretation are also discussed.
Commun Math Phys, 1999
We construct the Euclidean Green functions for the soliton (magnetic monopole) field in the U(1)4... more We construct the Euclidean Green functions for the soliton (magnetic monopole) field in the U(1)4 Lattice Gauge Theory with Wilson action. We show that in the strong coupling regime there is monopole condensation while in the QED phase the physical Hilbert space splits into orthogonal soliton sectors labeled by integer magnetic charge.
Phys Lett B, 2000
The one-loop corrections to K->pi and K->2pi matrix elements of the electroweak penguin operator ... more The one-loop corrections to K->pi and K->2pi matrix elements of the electroweak penguin operator are calculated. General next-to-leading order relations between the K->pi and K->2pi amplitudes are obtained. The fractional shift Delta_2 = 0.27 +- 0.27 is found for the O(p^2) corrections to a recent chiral determination of <(pi pi)_{I=2}|Q_{7,8}|K^0>. We explain why the sign for Delta_2 is opposite to that expected from unitarization approaches based on the Omnes equation. We perform a background-field, heat-kernel determination of the divergent one-loop amplitudes for a general class of (V-A)x(V+A) operators.
Physical Review D, Jan 30, 2002
We extend in several respects our earlier work on O(p2) corrections to the matrix elements of the... more We extend in several respects our earlier work on O(p2) corrections to the matrix elements of the electroweak penguin operator Oewp. First, to facilitate comparison with certain lattice studies we calculate O(p2) corrections to <pi\|Oewp\|K> in the SU(3) limit of equal light quark masses. Next, we demonstrate how an apparent disagreement in the literature regarding whether higher order chiral contributions increase or decrease <(pipi)I=2\|Oewp\|K> is simply a consequence of how the leading order chiral amplitude is defined. Finally, we address an aspect of the ε'/ε problem by estimating O(p2) corrections to recent determinations of <(pipi)I=2\|Q7,8\|K> which were carried out in the chiral limit.
Phys Rev Lett, 2007
We study the ratios Re/μ(P)≡Γ(P→eν¯e[γ])/Γ(P→μν¯μ[γ]) (P=π, K) in Chiral Perturbation Theory to o... more We study the ratios Re/μ(P)≡Γ(P→eν¯e[γ])/Γ(P→μν¯μ[γ]) (P=π, K) in Chiral Perturbation Theory to order e2p4. We complement the two-loop effective theory results with a matching calculation of the counterterm, finding Re/μ(π)=(1.2352±0.0001)×10-4 and Re/μ(K)=(2.477±0.001)×10-5.
Eur Phys J C, 2004
This talk is devoted to review the status of theoretical calculations of ɛ ' / ɛ. The focus is ma... more This talk is devoted to review the status of theoretical calculations of ɛ ' / ɛ. The focus is mainly on recent developments in non-lattice approaches to hadronic matrix elements. PACS: 13.25.Es Decays of K mesons - 11.30.Er CP violation
Physical review letters, Jan 20, 2015
We present lattice QCD results on the neutron tensor charges including, for the first time, a sim... more We present lattice QCD results on the neutron tensor charges including, for the first time, a simultaneous extrapolation in the lattice spacing, volume, and light quark masses to the physical point in the continuum limit. We find that the "disconnected" contribution is smaller than the statistical error in the "connected" contribution. Our estimates in the modified minimal subtraction scheme at 2 GeV, including all systematics, are g_{T}^{d-u}=1.020(76), g_{T}^{d}=0.774(66), g_{T}^{u}=-0.233(28), and g_{T}^{s}=0.008(9). The flavor diagonal charges determine the size of the neutron electric dipole moment (EDM) induced by quark EDMs that are generated in many new scenarios of CP violation beyond the standard model. We use our results to derive model-independent bounds on the EDMs of light quarks and update the EDM phenomenology in split supersymmetry with gaugino mass unification, finding a stringent upper bound of d_{n}<4×10^{-28} e cm for the neutron EDM in t...
Abstract: Using the 1=NC expansion scheme and truncating the hadronic spectrum to the lowest-lyin... more Abstract: Using the 1=NC expansion scheme and truncating the hadronic spectrum to the lowest-lying resonances, we match a meromorphic approximation to thehSPPi Green function onto QCD by imposing the correct large-momentum fallofi, both ofi-shell and on the relevant hadron mass shells. In this way we determine a number of chiral low-energy constants of O(p,… ¡
The possibility to discriminate between different operators contributing to lepton flavour violat... more The possibility to discriminate between different operators contributing to lepton flavour violating tau decays is discussed within an effective field theory framework. Correlations among decay rates in different channels as well as differential distributions in many-body decays are considered. Recent developments in the determination of the hadronic form factors for taurightarrowellpipi\tau \rightarrow \ell \pi \pitaurightarrowellpipi ($\ell = e, \mu$) decays are incorporated in the analysis. The above issues are exemplified by considering a Higgs-like boson with lepton flavour violating couplings. Implications of the search for lepton flavour violating Higgs decays performed recently by the CMS collaboration are also discussed.