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Wolke, Magnus
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Publications (10 of 292) 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., Adlarson, P., Biernat, J., Ikegami Andersson, W., Johansson, T., Kupsc, A., . . . Zou, J. H. (2019). Cross section measurements of e+e- -> K+ K- K+ K- and ΦK+ K- at center-of-mass energies from 2.10 to 3.08 GeV. Physical Review D: covering particles, fields, gravitation, and cosmology, 100(3), Article ID 032009.
Open this publication in new window or tab >>Cross section measurements of e+e- -> K+ K- K+ K- and ΦK+ K- at center-of-mass energies from 2.10 to 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. 100, no 3, article id 032009Article in journal (Refereed) Published
Abstract [en]

We measure the Born cross sections of the process e(+)e(-) -> K+ K- K+ K- at center-of-mass (c.m.) energies, root s, between 2.100 and 3.080 GeV. The data were collected using the BESIII detector at the BEPCII collider. An enhancement at root s = 2.232 GeV is observed, very close to the e(+)e(-) -> Lambda(Lambda) over bar production threshold. A similar enhancement at the same c.m. energy is observed in the e(+)e(-) -> phi K+ K- cross section. The energy dependence of the K+ K- K+ K- and phi K+ K- cross sections differs significantly from that of e(+)e(-) -> phi pi(+)pi(-).

National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-394263 (URN)10.1103/PhysRevD.100.032009 (DOI)000483349300001 ()
Funder
Knut and Alice Wallenberg Foundation, 2016.0157Swedish Research Council
Note

For complete list of authors see http://dx.doi.org/10.1103/PhysRevD.100.032009

Available from: 2019-10-08 Created: 2019-10-08 Last updated: 2019-10-08Bibliographically 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
Alfs, D., Asaturyan, A., Carmignotto, M., Diermaier, M., Eyrich, W., Glowacz, B., . . . Zmeskal, J. (2019). Drift chamber calibration and particle identification in the P-349 experiment. In: Wronska, A Magiera, A Przygoda, W (Ed.), MESON 2018 - 15th International Workshop on Meson Physics: . Paper presented at 15th International Workshop on Meson Physics (MESON), JUN 07-12, 2018, Krakow, POLAND. EDP Sciences, Article ID UNSP 05017.
Open this publication in new window or tab >>Drift chamber calibration and particle identification in the P-349 experiment
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2019 (English)In: MESON 2018 - 15th International Workshop on Meson Physics / [ed] Wronska, A Magiera, A Przygoda, W, EDP Sciences, 2019, article id UNSP 05017Conference paper, Published paper (Refereed)
Abstract [en]

The goal of the P-349 experiment is to test whether 3.5 GeV/c antiprotons produced in high-energy proton-proton collisions are polarized in view of the preparation of a polarized antiproton beam. In this article, we present the details of the ongoing analysis focused on the drift chambers calibration and particle identification with DIRC.

Place, publisher, year, edition, pages
EDP Sciences, 2019
Series
EPJ Web of Conferences, ISSN 2100-014X ; 199
National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-390015 (URN)10.1051/epjconf/201919905017 (DOI)000471304400095 ()
Conference
15th International Workshop on Meson Physics (MESON), JUN 07-12, 2018, Krakow, POLAND
Funder
EU, Horizon 2020, 721559 AVA
Available from: 2019-08-02 Created: 2019-08-02 Last updated: 2019-08-02Bibliographically 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
Adlarson, P., Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Berlowski, M., . . . Zurek, M. (2019). Examination of the production of an isotensor dibaryon in the pp -> pp pi(+)pi(-) reaction. Physical Review C: Covering Nuclear Physics, 99(2), Article ID 025201.
Open this publication in new window or tab >>Examination of the production of an isotensor dibaryon in the pp -> pp pi(+)pi(-) reaction
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2019 (English)In: Physical Review C: Covering Nuclear Physics, ISSN 2469-9985, E-ISSN 2469-9993, Vol. 99, no 2, article id 025201Article in journal (Refereed) Published
Abstract [en]

The quasifree pp -> pp pi(+)pi(-) reaction has been measured by means of pd collisions at T-p = 1.2 GeV using the WASA detector setup at COSY enabling exclusive and kinematically complete measurements. Total and differential cross sections have been extracted for the energy region T-p = 1.08-1.36 GeV (root s = 2.35-2.46 GeV) covering thus the regions of N* (1440 ) and Delta(1232)Delta(1232) resonance excitations. Calculations describing these excitations by t-channel meson exchange as well as isospin relations based on the pp -> pp pi(0)pi(0) data underpredict substantially the measured total cross section. The calculations are also at variance with specific experimental differential cross sections. An isotensor Delta N dibaryon resonance with I(J(P)) = 2(1(+) ) produced associatedly with a pion is able to overcome these deficiencies. Such a dibaryon was predicted by Dyson and Xuong [Phys. Rev. Lett. 13, 815 (1964)] and more recently calculated by A. Gal and H. Garcilazo [Nucl. Phys. A 928, 73 (2014)].

Place, publisher, year, edition, pages
AMER PHYSICAL SOC, 2019
National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-377601 (URN)10.1103/PhysRevC.99.025201 (DOI)000457696100003 ()
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., 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
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