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Ikegami Andersson, Walter
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Publications (10 of 114) Show all publications
Ablikim, M., Ikegami Andersson, W., Johansson, T., Kupsc, A., Li, C., Papenbrock, M., . . . Zou, J. H. (2019). Amplitude analysis and branching fraction measurement of D-0 -> K-pi(+)pi(0)pi(0). Physical Review D: covering particles, fields, gravitation, and cosmology, 99(9), Article ID 092008.
Open this publication in new window or tab >>Amplitude analysis and branching fraction measurement of D-0 -> K-pi(+)pi(0)pi(0)
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2019 (English)In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 99, no 9, article id 092008Article in journal (Refereed) Published
Abstract [en]

Utilizing the dataset corresponding to an integrated luminosity of 2.93 fb(-1) at root s = 3.773 GeV collected by the BESIII detector, we report the first amplitude analysis and branching fraction measurement of the D-0 -> K- pi(+)pi(0)pi(0) decay. We investigate the substructures and determine the relative fractions and the phases among the different intermediate processes. Our results are used to provide an accurate detection efficiency and allow measurement of B(D-0 -> K- pi(+)pi(0)pi(0)) = (8.86 +/- 0.13(stat) +/- 0.19(syst))%.

Place, publisher, year, edition, pages
American Physical Society, 2019
National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-389821 (URN)10.1103/PhysRevD.99.092008 (DOI)000470859800001 ()
Funder
Knut and Alice Wallenberg Foundation, 2016.0157Swedish Research Council
Note

For complete list of authors see http://dx.doi.org/10.1103/PhysRevD.99.092008

Available from: 2019-07-30 Created: 2019-07-30 Last updated: 2019-07-30Bibliographically approved
Ablikim, M., Adlarson, P., Biernat, J., Ikegami Andersson, W., Johansson, T., Kupsc, A., . . . Zou, J. H. (2019). Cross section measurements of e(+) e(-) -> omega chi(c0) from root s=4.178 to 4.278 GeV. Physical Review D: covering particles, fields, gravitation, and cosmology, 99(9), Article ID 091103.
Open this publication in new window or tab >>Cross section measurements of e(+) e(-) -> omega chi(c0) from root s=4.178 to 4.278 GeV
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2019 (English)In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 99, no 9, article id 091103Article in journal (Refereed) Published
Abstract [en]

The cross section of the process e(+)e(-) -> omega chi(C0) is measured at center -of -mass energies from root s = 4.178 to 4.278 GeV using a data sample of 7 fb(-1) collected with the BESIII detector operating at the BEPCII storage ring. The dependence of the cross section on root s shows a resonant structure with mass of (4218.5 +/- 1.6(stat) +/- 4.0(syst)) MeV/c(2) and width of (28.2 +/- 3.9(stat) +/- 1.6(syst)) MeV, respectively. This observation confirms and improves upon the result of a previous study. The angular distribution of the e(+) e(-) ->omega chi(C0) process is extracted for the first time.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC, 2019
National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-386159 (URN)10.1103/PhysRevD.99.091103 (DOI)000468220800001 ()
Funder
Swedish Research CouncilGerman Research Foundation (DFG)
Note

For complete list of authors see http://dx.doi.org/10.1103/PhysRevD.99.091103

Available from: 2019-06-20 Created: 2019-06-20 Last updated: 2019-06-20Bibliographically approved
Ablikim, M., Andersson, W. I., Johansson, T., Kupsc, A., Li, C., Papenbrock, M., . . . Zou, J. H. (2019). Determination of the Pseudoscalar Decay Constant f(Ds)(+) via D-s(+) -> mu(+)nu(mu). Physical Review Letters, 122(7), Article ID 071802.
Open this publication in new window or tab >>Determination of the Pseudoscalar Decay Constant f(Ds)(+) via D-s(+) -> mu(+)nu(mu)
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2019 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 122, no 7, article id 071802Article in journal (Refereed) Published
Abstract [en]

Using a 3.19 fb(-1) data sample collected at an e(+)e(-) center-of-mass energy of E-cm = 4.178 GeV with the BESIII detector, we measure the branching fraction of the leptonic decay D-s(+) -> mu(+)nu(mu) to be BDs+ -> mu+nu mu = (5.49 +/- 0.16(stat) +/- 0.15(syst)) x 10(-3). Combining our branching fraction with the masses of the D-s(+) and mu(+) and the lifetime of the D-s(+), we determine f(Ds+)vertical bar V-cs vertical bar = 246.2 +/- 3.6(stat) +/- 3.5(syst) MeV. Using the c -> s quark mixing matrix element vertical bar V-cs vertical bar determined from a global standard model fit, we evaluate the D-s(+) decay constant f(Ds+) = 252.9 +/- 3.7(stat) +/- 3.6(syst) MeV. Alternatively, using the value of f(Ds+) calculated by lattice quantum chromodynamics, we find vertical bar V-cs vertical bar = 0.985 +/- 0.014(stat) +/- 0.014(syst). These values of BDs+ -> mu+nu mu, f(Ds+)vertical bar V-cs vertical bar, f(Ds+) and vertical bar V-cs vertical bar are each the most precise results to date.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC, 2019
National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-379259 (URN)10.1103/PhysRevLett.122.071802 (DOI)000459583400004 ()30848637 (PubMedID)
Funder
Swedish Research Council
Note

For complete list of authors see http://dx.doi.org/10.1103/PhysRevLett.122.071802

Available from: 2019-03-18 Created: 2019-03-18 Last updated: 2019-03-18Bibliographically approved
Ablikim, M., Ikegami Andersson, W., Johansson, T., Kupsc, A., Li, C., Papenbrock, M., . . . Zou, J. H. (2019). Evidence for the decays of Lambda(+)(C) -> Sigma(+) eta and Sigma(+) eta '. Chinese Physics C, High Energy Physics & Nuclear Physics, 43(8), Article ID 083002.
Open this publication in new window or tab >>Evidence for the decays of Lambda(+)(C) -> Sigma(+) eta and Sigma(+) eta '
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2019 (English)In: Chinese Physics C, High Energy Physics & Nuclear Physics, ISSN 1674-1137, E-ISSN 0899-9996, Vol. 43, no 8, article id 083002Article in journal (Refereed) Published
Abstract [en]

We study the hadronic decays of Lambda(+)(C) to the final states Sigma(+) eta and Sigma(+) eta', using an e(+) e(-) annihilation data sample of 567 pb(-1) taken at a center-of-mass energy of 4.6 GeV with the BESIII detector at the BEPCII collider. We find evidence for the decays Lambda(+)(C) -> Sigma(+) eta and Sigma(+) eta' with statistical significance of and, respectively. Normalizing to the reference decays Lambda(+)(C) -> Sigma(+) pi(0) and Sigma(+) omega, we obtain the ratios of the branching fractions B(Lambda(+)(C) -> Sigma(+) eta)/B(Lambda(+)(C) -> Sigma(+) pi(0)) and B(Lambda(+)(C) -> Sigma(+) eta')/B(Lambda(+)(C) -> Sigma(+) omega) to be 0.35 +/- 0.16 +/- 0.02 and 0.86 +/- 0.34 +/- 0.04, respectively. The upper limits at the 90% confidence level are set to be B(Lambda(+)(C) -> Sigma(+) eta)/B(Lambda(+)(C) -> Sigma(+) pi(0)) < 0.58 and B(Lambda(+)(C) -> Sigma(+) eta')/B(Lambda(+)(C) -> Sigma(+) omega) < 1.2. Using BESIII measurements of the branching fractions of the reference decays, we determine B(Lambda(+)(C) -> Sigma(+) eta) = (0.41 +/- 0.19 +/- 0.05)% (<0.68%) and B(Lambda(+)(C) -> Sigma(+) eta') = (1.34 +/- 0.53 +/- 0.19)% (<1.9%). Here, the first uncertainties are statistical and the second systematic. The obtained branching fraction of Lambda(+)(C) -> Sigma(+) eta is consistent with the previous measurement, and the branching fraction of Lambda(+)(C) -> Sigma(+) eta' is measured for the first time.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD, 2019
Keywords
charmed baryon, Lambda(+)(C) decays, branching fractions
National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-390389 (URN)10.1088/1674-1137/43/8/083002 (DOI)000475778100002 ()
Funder
Swedish Research Council
Note

For complete list of authors see http://dx.doi.org/10.1088/1674-1137/43/8/083002

Available from: 2019-08-09 Created: 2019-08-09 Last updated: 2019-08-09Bibliographically approved
Ablikim, M., Andersson, W. I., Johansson, T., Kupsc, A., Li, C., Papenbrock, M., . . . Zou, J. H. (2019). Evidence of a Resonant Structure in the e(+) e(-) -> pi(+) (DD)-D-0*(-) Cross Section between 4.05 and 4.60 GeV. Physical Review Letters, 122(10), Article ID 102002.
Open this publication in new window or tab >>Evidence of a Resonant Structure in the e(+) e(-) -> pi(+) (DD)-D-0*(-) Cross Section between 4.05 and 4.60 GeV
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2019 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 122, no 10, article id 102002Article in journal (Refereed) Published
Abstract [en]

The cross section of the process e(+) e(-) -> pi(+) (DD)-D-0*(-) for center-of-mass energies from 4.05 to 4.60 GeV is measured precisely using data samples collected with the BESIII detector operating at the BEPCII storage ring. Two enhancements are clearly visible in the cross section around 4.23 and 4.40 GeV. Using several models to describe the dressed cross section yields stable parameters for the first enhancement, which has a mass of 4228.6 +/- 4.1 +/- 6.3 MeV/c(2) and a width of 77.0 +/- 6.8 +/- 6.3 MeV, where the first uncertainties are statistical and the second ones are systematic. Our resonant mass is consistent with previous observations of the Y(4220) state and the theoretical prediction of a D (D) over bar (1)(2420) molecule. This result is the first observation of Y(4220) associated with an open-charm final state. Fits with three resonance functions with additional Y(4260), Y(4320), Y(4360), psi(4415), or a new resonance do not show significant contributions from either of these resonances. The second enhancement is not from a single known resonance. It could contain contributions from psi(4415) and other resonances, and a detailed amplitude analysis is required to better understand this enhancement.

National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-381081 (URN)10.1103/PhysRevLett.122.102002 (DOI)000461919200003 ()30932669 (PubMedID)
Funder
Swedish Research Council
Note

For complete list of authors see http://dx.doi.org/10.1103/PhysRevLett.122.102002

Available from: 2019-04-23 Created: 2019-04-23 Last updated: 2019-04-23Bibliographically approved
Ablikim, M., Andersson, W. I., Johansson, T., Kupsc, A., Li, C., Pettersson, J., . . . Zou, J. H. (2019). First Measurement of the Form Factors in D-s(+) -> K(0)e(+)nu(e) and D-s(+) -> K*(0)e(+)nu(e) Decays. Physical Review Letters, 122(6), Article ID 061801.
Open this publication in new window or tab >>First Measurement of the Form Factors in D-s(+) -> K(0)e(+)nu(e) and D-s(+) -> K*(0)e(+)nu(e) Decays
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2019 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 122, no 6, article id 061801Article in journal (Refereed) Published
Abstract [en]

We report on new measurements of Cabibbo-suppressed semileptonic D-s(broken vertical bar) decays using 3.19 fb(-1) of e(broken vertical bar)e(-) annihilation data sample collected at a center-of-mass energy of 4.178 GeV with the BESIII detector at the BEPCII collider. Our results include branching fractions B(D-s(+) -> K(0)e(+)nu(e)) = [3.25 +/- 0.38(stat) +/- 0.16(syst)] x 10(-3) and B(D-s(+) -> K*(0)e(+)nu(e)) = [2.37 +/- 0.26(stat) +/- 0.20(syst)] x 10(-3), which are much improved relative to previous measurements, and the first measurements of the hadronic form-factor parameters for these decays. For D-s(+) -> K(0)e(+)nu(e), we obtain f(+)(0) = 0.720 +/- 0.084(stat) +/- 0.013(syst), and for D-s(+) -> K*(0)e(+)nu(e), we find form-factor ratios r(V) = V(0)/A(1)(0) = 1.67 +/- 0.34(stat) +/- 0.16(syst) and r(2) = A(2)(0)/A(1)(0) = 0.77 +/- 0.28(stat) +/- 0.07(syst).

Place, publisher, year, edition, pages
AMER PHYSICAL SOC, 2019
National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-378373 (URN)10.1103/PhysRevLett.122.061801 (DOI)000458825100002 ()30822077 (PubMedID)
Funder
Swedish Research Council
Note

For complete list of authors see http://dx.doi.org/10.1103/PhysRevLett.122.061801

Available from: 2019-03-07 Created: 2019-03-07 Last updated: 2019-03-07Bibliographically approved
Ablikim, M., Adlarson, P., Biernat, J., Ikegami Andersson, W., Johansson, T., Kupsc, A., . . . Zou, J. H. (2019). First observations of h(c )-> hadrons. Physical Review D: covering particles, fields, gravitation, and cosmology, 99(7), Article ID 072008.
Open this publication in new window or tab >>First observations of h(c )-> hadrons
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2019 (English)In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 99, no 7, article id 072008Article in journal (Refereed) Published
Abstract [en]

Based on (4.48 +/- 0.03) x 10(8) Psi(3686) events, collected with the BESIII detector at the BEPCII storage ring, five h(c) hadronic decays are searched for via the process Psi(3686) -> pi(0)h(c). Three of them, h(c) -> p (p) over bar pi(+)pi(-) , pi(+)pi(-)pi(0 )and 2(pi(+)pi(-))pi(0) are observed for the first time with significances of 7.4 sigma, 4.6 sigma, and 9.1 sigma, and their branching fractions are determined to be (2.89 +/- 0.32 +/- 0.55) x 10(-3), (1.60 +/- 0.40 +/- 0.32) x 10(-3), and (7.44 +/- 0.94 +/- 1.52) x 10(-3), respectively, where the first uncertainties are statistical and the second systematic. No significant signal is observed for the other two decay modes, and the corresponding upper limits of the branching fractions are determined to be B(h(c) -> 3(pi(+)pi(-))pi(0)) < 8.7 x 10(-3) and B(h(c) -> K+K-pi(+)pi(-) ) < 5.8 x 10(-4) at the 90% confidence level.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC, 2019
National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-383854 (URN)10.1103/PhysRevD.99.072008 (DOI)000466419600001 ()
Funder
Knut and Alice Wallenberg Foundation, 2016.0157Swedish Research CouncilGerman Research Foundation (DFG), CRC 1044
Note

For complete list of authors see http://dx.doi.org/10.1103/PhysRevD.99.072008

Available from: 2019-05-24 Created: 2019-05-24 Last updated: 2019-05-24Bibliographically approved
Ablikim, M., Andersson, W. I., Johansson, T., Kupsc, A., Li, C., Papenbrock, M., . . . Zou, J. H. (2019). Measurement of e(+) e(-) -> K+ K- cross section at root s=2.00-3.08 GeV. Physical Review D: covering particles, fields, gravitation, and cosmology, 99(3), Article ID 032001.
Open this publication in new window or tab >>Measurement of e(+) e(-) -> K+ K- cross section at root s=2.00-3.08 GeV
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2019 (English)In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 99, no 3, article id 032001Article in journal (Refereed) Published
Abstract [en]

The cross section of the process e(+) e(-) -> K+ K- is measured at a number of center-of-mass energies root s from 2.00 to 3.08 GeV with the BESIII detector at the Beijing Electron Positron Collider (BEPCII). The results provide the best precision achieved so far. A resonant structure around 2.2 GeV is observed in the cross section line shape. A Breit-Wigner fit yields a mass of M = 2239.2 +/- 7.1 +/- 11.3 MeV/c(2) and a width of Gamma = 139.8 +/- 12.3 +/- 20.6 MeV, where the first uncertainties are statistical and the second ones are systematic. In addition, the timelike electromagnetic form factor of the kaon is determined at the individual center-of-mass energy points.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC, 2019
National Category
Subatomic Physics Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:uu:diva-377602 (URN)10.1103/PhysRevD.99.032001 (DOI)000457699400001 ()
Funder
Swedish Research Council
Note

For complete list of authors see http://dx.doi.org/10.1103/PhysRevD.99.032001

Available from: 2019-02-26 Created: 2019-02-26 Last updated: 2019-03-07Bibliographically approved
Ablikim, M., Andersson, W. I., Johansson, T., Kupsc, A., Li, C., Papenbrock, M., . . . Zou, J. H. (2019). Measurement of the absolute branching fractions of Lambda(+)(c) -> Lambda eta pi(+) and Sigma(1385) (+) eta. Physical Review D: covering particles, fields, gravitation, and cosmology, 99(3), Article ID 032010.
Open this publication in new window or tab >>Measurement of the absolute branching fractions of Lambda(+)(c) -> Lambda eta pi(+) and Sigma(1385) (+) eta
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2019 (English)In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 99, no 3, article id 032010Article in journal (Refereed) Published
Abstract [en]

We study the decays Lambda(+)(c) -> Lambda eta pi(+) and Sigma(1385)(+)eta based on Lambda(+)(c)(Lambda) over bar (c) pairs produced in e(+)e(-) collisions at a center-of-mass energy of root s = 4.6 GeV, corresponding to an integrated luminosity of 567 pb(-1). The data sample was accumulated with the BESIII detector at the BEPCII collider. The branching fractions are measured to be beta(Lambda(+)(c) -> Lambda eta pi(+)) = (1.84 +/- 0.21 (stat) +/- 0.15(syst))% and B(Lambda(+)(c) -> Sigma(1385)(+) eta) = (0.91 +/- 0.18 (stat) +/- 0.09 (syst))%, constituting the most precise measurements to date.

National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-378989 (URN)10.1103/PhysRevD.99.032010 (DOI)000459207600002 ()
Funder
Swedish Research CouncilGerman Research Foundation (DFG)
Note

For complete list of authors see http://dx.doi.org/10.1103/PhysRevD.99.032010

Available from: 2019-03-19 Created: 2019-03-19 Last updated: 2019-03-19Bibliographically approved
Ablikim, M., Adlarson, P., Biernat, J., Andersson, W. I., Johansson, T., Kupsc, A., . . . Zou, J. H. (2019). Measurement of the branching fraction of J/psi -> omega eta 'pi(+)pi(-) and search for J/psi -> omega X(1835), X(1835) -> eta 'pi(+)pi(-) decay. Physical Review D: covering particles, fields, gravitation, and cosmology, 99(7), Article ID 071101.
Open this publication in new window or tab >>Measurement of the branching fraction of J/psi -> omega eta 'pi(+)pi(-) and search for J/psi -> omega X(1835), X(1835) -> eta 'pi(+)pi(-) decay
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2019 (English)In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 99, no 7, article id 071101Article in journal (Refereed) Published
Abstract [en]

Using a sample of 1.31 x 10(9) J/psi events collected by the BESIII detector at BEPCII during 2009 and 2012, we study the J/psi -> omega eta'pi(+)pi(-) thorn p-hadronic process. For the first time, we measure the branching ratio B(J/psi -> omega eta'pi(+)pi(-)) = (1.12 +/- 0.02 +/- 0.13) x 10(-3). We search for the X(1835) state in the eta'pi(+)pi(-) invariant mass spectra. No evidence is found and we estimate the upper limit on the branching fraction at 90% confidence level to be B(J/psi -> omega X(1835), X(1835) -> eta'pi(+)pi(-)) < 6.2 x 10(-5).

Place, publisher, year, edition, pages
AMER PHYSICAL SOC, 2019
National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-382564 (URN)10.1103/PhysRevD.99.071101 (DOI)000463892700001 ()
Funder
Swedish Research Council
Note

For complete list of authors see http://dx.doi.org/10.1103/PhysRevD.99.071101

Available from: 2019-05-03 Created: 2019-05-03 Last updated: 2019-05-03Bibliographically approved
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