Long-acting reversible contraceptives (LARC) represent an especially effective kind of post-abortion contraception. We aimed at assessing satisfaction, discontinuation, efficacy, and tolerability ...associated with either levonorgestrel intrauterine device (L-IUCD), the copper intrauterine device (C-IUCD) and implant (IMP) after termination of pregnancy (TOP). We recorded baseline data about the patients and performed phone surveys at 3, 6 and 12 months after insertion to assess the bleeding profile. Furthermore, women were inquired about possible adverse events, satisfaction, and discontinuation at 12 months after insertion. LARC continuers (>12 months after TOP) were divided into three groups: L-IUCD (n = 47), C-IUCD (n = 6) and IMP (n = 36). Satisfaction rates among L-IUCD users were higher than among IMP users (100% vs. 72.2%, p < .05). A higher, yet not significant, share of patients decided to withdraw contraception in IMP group (3.6% in IUCD group and 12.2% in IMP group). The bleeding profile was significantly more favorable among L-IUCD users than among IMP users. Finally, the reported rate of treatment-associated adverse events did not differ significantly among the groups. L-IUCD insertion after TOP is associated with higher satisfaction and lower discontinuation rates than IMP. Such pattern could be attributed to a more favorable bleeding profile.
Evidence for the decay X(3872)→ψ(2S)γ Ajaltouni, Z.; An, L.; Andreotti, M. ...
Nuclear physics. B,
09/2014, Letnik:
886, Številka:
C
Journal Article
Recenzirano
Odprti dostop
Evidence for the decay mode X(3872)→ψ(2S)γ in B+→X(3872)K+ decays is found with a significance of 4.4 standard deviations. The analysis is based on a data sample of proton–proton collisions, ...corresponding to an integrated luminosity of 3 fb−1, collected with the LHCb detector, at centre-of-mass energies of 7 and 8 TeV. The ratio of the branching fraction of the X(3872)→ψ(2S)γ decay to that of the X(3872)→J/ψγ decay is measured to beB(X(3872)→ψ(2S)γ)B(X(3872)→J/ψγ)=2.46±0.64±0.29, where the first uncertainty is statistical and the second is systematic. The measured value does not support a pure DD¯⁎ molecular interpretation of the X(3872) state.
The difference in total widths between the Bc+ and B+ mesons is measured using a data sample corresponding to an integrated luminosity of 3.0 fb−1 collected by the LHCb experiment in 7 and 8 TeV ...centre-of-mass energy proton–proton collisions at the LHC. Through the study of the time evolution of Bc+→J/ψπ+ and B+→J/ψK+ decays, the width difference is measured to beΔΓ≡ΓBc+−ΓB+=4.46±0.14±0.07 mm−1c, where the first uncertainty is statistical and the second systematic. The known lifetime of the B+ meson is used to convert this to a precise measurement of the Bc+ lifetime,τBc+=513.4±11.0±5.7 fs, where the first uncertainty is statistical and the second is systematic.
We study the processes (ProQuest: Formulae and/or non-USASCII text omitted) using a data sample of 519fb super(-1) recorded with the BABAR detector operating at the SLAC PEP-II asymmetric-energy e ...super(+)e super(-) collider at center-of-mass energies at and near the Upsilon(nS) (n=2, 3, 4) resonances. We observe eta super(c) decays to both final states and perform Dalitz plot analyses using a model-independent partial wave analysis technique. This allows a model-independent measurement of the mass-dependence of the I=1/2 KpiS-wave amplitude and phase. A comparison between the present measurement and those from previous experiments indicates similar behavior for the phase up to a mass of 1.5GeV/c super(2). In contrast, the amplitudes show very marked differences. The data require the presence of a new a0(1950) resonance with parameters m=1931+ or -14+ or -22MeV/c super(2) and Gamma=271+ or -22+ or -29MeV.
Recent astrophysical and terrestrial experiments have motivated the proposal of a dark sector with GeV-scale gauge boson force carriers and new Higgs bosons. We present a search for a dark Higgs ...boson using 516 fb(-1) of data collected with the BABAR detector. We do not observe a significant signal and we set 90% confidence level upper limits on the product of the standard model-dark-sector mixing angle and the dark-sector coupling constant.
Search for the decay B 0 → ϕμ + μ Aaij, R.; Eklund, Lars; Zunica, G.
The journal of high energy physics,
05/2022, Letnik:
2022, Številka:
5
Journal Article
Recenzirano
Odprti dostop
A search for the decay B-0 -> phi mu(+) mu(-) is performed using proton-proton collisions at centre-of-mass energies of 7, 8, and 13 TeV collected by the LHCb experiment and corresponding to an ...integrated luminosity of 9 fb(-1). No evidence for the B-0 -> phi mu(+) mu(-) decay is found and an upper limit on the branching fraction, excluding the 0 and charmonium regions in the dimuon spectrum, of 4.4 x 10(-3) at a 90% credibility level, relative to that of the B-s(0) -> phi mu(+) mu(-) decay, is established. Using the measured B-s(0) -> phi mu(+) mu(-) branching fraction and assuming a phase-space model, the absolute branching fraction of the decay B-0 -> phi mu(+) mu(-) in the full q(2) range is determined to be less than 3.2 x 10(-9) at a 90% credibility level.
Using the eight time dependences e? super(Gammat)(1+C sub()icosDeltamt+S sub() isinDeltamt) for the decays Upsilon(4S)arrowrightB super(0)B super(0)arrowrightf sub(@)jfdk with the decay into a ...flavor-specific state f sub()jscriptl super(+ or -)X before or after the decay into a CP eigenstate f sub()kccK sub()S,Las measured by the BABAR experiment, we determine the three CPT-sensitive parameters Re(z) and Im(z) in B super(0)?B super(0) mixing and A/A in B super(0)arrowrightc cK super(0) decays. We find Im(z)=0.010+ or -0.030+ or -0.013, Re(z)=?0.065+ or -0.028+ or -0.014, and A/A=0.999+ or -0.023+ or -0.017, in agreement with CPT symmetry.
We perform the first measurement on the D super(0)- super( D) super(0) mixing parameters using a time-dependent amplitude analysis of the decay D super(0)arrowrightpi super(+)pi super(-)pi super(0). ...The data were recorded with the BABAR detector at center-of-mass energies at and near the Upsilon(4S) resonance, and correspond to an integrated luminosity of approximately 468.1fb super(-1). The neutral D meson candidates are selected from D*(2010) super(+)arrowrightD super(0)pi super(+) sdecays where the flavor at the production is identified by the charge of the low-momentum pion, pi sub()s super(+) The measured mixing parameters are x=(1.5+ or -1.2+ or -0.6)% and y=(0.2+ or -0.9+ or -0.5)%, where the quoted uncertainties are statistical and systematic, respectively.
A search for the rare decays Bs0→π+π−μ+μ− and B0→π+π−μ+μ− is performed in a data set corresponding to an integrated luminosity of 3.0 fb−1 collected by the LHCb detector in proton–proton collisions ...at centre-of-mass energies of 7 and 8 TeV. Decay candidates with pion pairs that have invariant mass in the range 0.5–1.3 GeV/c2 and with muon pairs that do not originate from a resonance are considered. The first observation of the decay Bs0→π+π−μ+μ− and the first evidence of the decay B0→π+π−μ+μ− are obtained and the branching fractions, restricted to the dipion-mass range considered, are measured to be B(Bs0→π+π−μ+μ−)=(8.6±1.5 (stat)±0.7 (syst)±0.7(norm))×10−8 and B(B0→π+π−μ+μ−)=(2.11±0.51(stat)±0.15(syst)±0.16(norm))×10−8, where the third uncertainty is due to the branching fraction of the decay B0→J/ψ(→μ+μ−)K⁎(892)0(→K+π−), used as a normalisation.
(ProQuest: ... denotes formulae and/or non-USASCII text omitted)We measure the time-dependent CP asymmetry in the radiative-penguin decay B super(0) arrowright ..., using a sample of 471x10 ...super(6)Upsilon(4S) arrowright BB events recorded with the BABAR detector at the PEP-II e super(+)e super(-) storage ring at SLAC. Using events with m sub()Kpipi1.8GeV/c super(2), we measure the branching fractions of B super(+) arrowright K super(+)pi super(-)pi super(+)gamma and B super(0) arrowright K super(0)pi super(-)pi super(+)gamma, the branching fractions of the kaonic resonances decaying to K super(+)pi super(-)pi super(+), as well as the overall branching fractions of the B super(+) arrowright rho super(0)K super(+)gamma, B super(+) arrowright K* super(0)pi super(+)gamma and S-wave B super(+) arrowright ... components. For events from the rho mass band, we measure the CP-violating parameters ... and ..., where the first uncertainties are statistical and the second are systematic. We extract from this measurement the time-dependent CP asymmetry related to the CP eigenstate ... and obtain ..., which provides information on the photon polarization in the underlying bsgamma transition.
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