1,722,547 research outputs found
Measurement of the absolute branching fractions B -> D pi, D-*pi, D-**pi with a missing mass method
Get PDFWe present branching fraction measurements of charged and neutral B decays to D pi(-), D-*pi(-), and "D-**"pi(-) with a missing mass method, based on a sample of 231x10(6) Upsilon(4S)-> B (B) over bar pairs collected by the BABAR detector at the PEP-II e(+)e(-) collider. One of the B mesons is fully reconstructed and the other one decays to a reconstructed charged pi and a companion charmed meson identified by its recoil mass, inferred by kinematics. Here "D-**" refers to the sum of all the nonstrange charm meson states with masses in the range 2.2-2.8 GeV/c(2). We measure the branching fractions: B(B--> D-0 pi(-))=(4.49 +/- 0.21 +/- 0.23)x10(-3), B(B--> D-*0 pi(-))=(5.13 +/- 0.22 +/- 0.28)x10(-3), B(B-->"D-**0"pi(-))=(5.50 +/- 0.52 +/- 1.04)x10(-3), B((B) over bar (0)-> D+pi(-))=(3.03 +/- 0.23 +/- 0.23)x10(-3), B((B) over bar (0)-> D*+pi(-))=(2.99 +/- 0.23 +/- 0.24)x10(-3), B((B) over bar (0)->"D**+"pi(-))=(2.34 +/- 0.65 +/- 0.88)x10(-3), and their ratios
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Measurement of the Absolute Branching FractionsB to D\pi, D^*\pi, D^{**}\pi with aMissing Mass Method
No full textWe present branching fraction measurements of charged and neutral B decays to D{pi}{sup -}, D*{pi}{sup -} and D**{pi}{sup -} with a missing mass method, based on a sample of 231 million {Upsilon}(4S) {yields} B{bar B} pairs collected by the BABAR detector at the PEP-II e{sup +}e{sup -} collider. One of the B mesons is fully reconstructed and the other one decays to a reconstructed charged {pi} and a companion charmed meson identified by its recoil mass, inferred by kinematics. Here D** refers to the sum of all the non-strange charm meson states with masses in the range 2.2-2.8 GeV/c{sup 2}
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Heavy quark symmetry and D1 (2420) ---> D* pi decay
No full textHeavy-quark symmetry relates the D-wave amplitude for D1(2420) --> D*pi to the amplitudes for the decays D2*(2460) --> D*pi and D2*(2460) --> D pi. We discuss the extraction of the S and D partial wave amplitudes for D1 --> D*pi and their significance as tests of the applicability of heavy-quark symmetry for charm quarks
Study of D-J meson decays to D+pi(-), D-0 pi(+) and D*(+)pi(-) final states in pp collisions
No full textA study of D+pi(-), D-0 pi(+) and D0+pi(-) final states is performed using pp collision data, corresponding to an integrated luminosity of 1.0 fb(-1), collected at a centre-of-mass energy of 7 TeV with the LHCb detector. The D-1(2420)(0) resonance is observed in the D*(+)pi(-) final state and the D*(2)(2460) resonance is observed in the D+pi(-), D-0 pi(+) and D*(+)pi(-) final states. For both resonances, their properties and spin-parity assignments are obtained. In addition, two natural parity and two unnatural parity resonances are observed in the mass region between 2500 and 2800 MeV. Further structures in the region around 3000 MeV are observed in all the D*(+)pi(-), D-0 pi(-) and D0+pi(+) final states
Measuring the CKM angle gamma with B0d -> D*pi
No full textThe channel B0->D*pi provides a theoretically clean way to measure the CKM angle gamma. This note investigates the viability of a measurement of gamma with B0->D*pi at LHCb. Efficient methods for the reconstruction of B0->D*pi events are developed, allowing the inclusive reconstruction of all B0->D*pi events with subsequent D*->D0pi decays, irrespective of the decay mode of the D0. It is shown how the B0 4-momentum can be fully reconstructed despite the missing D0 information. Using the LHCb detector simulation program SICb, reconstruction efficiencies and signal to background ratios are estimated. It is demonstrated that the channel B0->D*pi can provide a precision in gamma of a few degrees after one year of LHCb data taking
Study of e(+)e(-) -> D+D-pi(+)pi(-) at center-of-mass energies from 4.36 to 4.60 GeV
No full textWe report a study of the e(+)e(-) -> D+D-pi(+)pi(-) process using e(+)e(-) collision data samples with an integrated luminosity of 2.5 fb(-1) at center-of-mass energies from 4.36 to 4.60 GeV, collected with the BESIII detector at the BEPCII storage ring. The D1(2420)+ is observed in the D+pi(+)pi(-) mass spectrum. The mass and width of the D-1(2420)+ are measured to be (2427.2 +/- 1.0(stat).+/- 1.2(syst).) MeV/c(2) and (23.2 +/- 2.3(stat). +/- 2.3(syst).) MeV, respectively. In addition, the Born cross sections of the e(+)e(-) -> D-1(2420)D-+(-) + c.c. -> D+D-pi(+)pi(-) and e(+)e(-) -> psi(3770)pi(+)pi(-) -> D+D-pi(+)pi(-) processes are measured as a function of the center-of-mass energy. (c) 2020 The Author. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/)
Study of e(+)e(-) -> D+D-pi(+)pi(-) at center-of-mass energies from 4.36 to 4.60 GeV
Get PDF8 pagesWe report a study of the e(+)e(-) -> D+D-pi(+)pi(-) process using e(+)e(-) collision data samples with an integrated luminosity of 2.5 fb(-1) at center-of-mass energies from 4.36 to 4.60 GeV, collected with the BESIII detector at the BEPCII storage ring. The D1(2420)+ is observed in the D+pi(+)pi(-) mass spectrum. The mass and width of the D-1(2420)+ are measured to be (2427.2 +/- 1.0(stat).+/- 1.2(syst).) MeV/c(2) and (23.2 +/- 2.3(stat). +/- 2.3(syst).) MeV, respectively. In addition, the Born cross sections of the e(+)e(-) -> D-1(2420)D-+(-) + c.c. -> D+D-pi(+)pi(-) and e(+)e(-) -> psi(3770)pi(+)pi(-) -> D+D-pi(+)pi(-) processes are measured as a function of the center-of-mass energy. (c) 2020 The Author. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/)
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Observation of the D-1(2420) -> D pi(+)pi(-) decays
Get PDFWe report on the first observation of D-1(0)(2420)-> D(0)pi(-)pi(+) and D-1(+)(2420)-> D(+)pi(-)pi(+) decays (where the contribution from the dominant known D-1-> D(*)pi decay mode is excluded) in the B--> D(1)(0)pi(-) and (B) over bar (0)-> D(1)(+)pi(-) decays, respectively. The observation is based on 15.2x10(7) B (B) over bar events collected with the Belle detector at the KEKB collider. We also set 90% confidence level upper limits for the branching fractions of the four following decays: B--> D(1)(0)pi(-), D-1(0)-> D(*0)pi(-)pi(+), (B) over bar (0)-> D(1)(+)pi(-), D-1(+)-> D(*+)pi(-)pi(+), B--> D-2(*0)(2460)pi(-), D-2(*0)-> D(*0)pi(-)pi(+), (B) over bar (0)-> D-2(*+)(2460)pi(-), D-2(*+)-> D(*+)pi(-)pi(+)
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