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Biomedical subjects

P Koppenburg

Publications and source records attributed to P Koppenburg.

At least 37 records · Page 2Linked to original sources
PubMed2004

Observation of radiative B-->phi K gamma decays.

The radiative decay B-->phi K gamma is observed for the first time. The branching fraction for the charged B--->phi K- gamma decay mode is measured to be B(B--->phi K- gamma)=(3.4+/-0.9+/-0.4)x10(-6). The photon energy distribution for the B--->phi K- gamma decay is presented. The signal for the neutral B(0)-->phi K(0)gamma decay mode is not statistically significant and an upper limit, B(B(0)-->phi K(0)gamma)<8.3x10(-6) at 90% C.L., is set. The analysis is based on a data set of 90 fb(-1) collected by the Belle experiment at the e(+)e(-) asymmetric collider KEKB.

Journal Article↗
PubMed2004

Measurements of the D(sJ) resonance properties.

We report measurements of the properties of the D(+)(sJ)(2317) and D(+)(sJ)(2457) resonances produced in continuum e(+)e(-) annihilation near sqrt[s]=10.6 GeV. The analysis is based on an 86.9 fb(-1) data sample collected with the Belle detector at KEKB. We determine the masses to be M(D(+)(sJ)(2317))=2317.2+/-0.5(stat)+/-0.9(syst) MeV/c(2) and M(D(+)(sJ)(2457))=2456.5+/-1.3(stat)+/-1.3(syst) MeV/c(2). We observe the radiative decay mode D(+)(sJ)(2457)-->D(+)(s)gamma and the dipion decay mode D(+)(sJ)(2457)-->D(+)(s)pi(+)pi(-) and determine their branching fractions. No corresponding decays are observed for the D(sJ)(2317) state. These results are consistent with the spin-parity assignments of 0(+) for the D(sJ)(2317) and 1(+) for the D(sJ)(2457).

Journal Article↗
PubMed2003

Measurement of time-dependent CP-violating asymmetries in B0-->phiK(0)S, K+K-K0(S), and eta'K0(S) decays.

We present an improved measurement of CP-violation parameters in B0-->phiK(0)(S), K(+)K(-)K(0)(S), and eta(')K(0)(S) decays based on a 140 fb(-1) data sample collected at the Upsilon(4S) resonance with the Belle detector at the KEKB energy-asymmetric e(+)e(-) collider. One neutral B meson is fully reconstructed in one of the specified decay channels, and the flavor of the accompanying B meson is identified from its decay products. CP-violation parameters for each of the three modes are obtained from the asymmetries in the distributions of the proper-time intervals between the two B decays. We find that the observed CP asymmetry in the B-->phiK(0)(S) decay differs from the standard model (SM) expectation by 3.5 standard deviations, while the other cases are consistent with the SM.

Journal Article↗
PubMed2003

Observation of the D(sJ)(2317) and D(sJ)(2457) in B decays.

We report the first observation of the B-->Dmacr;D(sJ)(2317) and B-->Dmacr;D(sJ)(2457) decays based on 123.8x10(6) BBmacr; events collected with the Belle detector at KEKB. We observe the D(sJ)(2317) decay to D(s)pi(0) and the D(sJ)(2457) decay to the D(*)(s)pi(0) and D(s)gamma final states. We also set 90% C.L. upper limits for the decays D(sJ)(2317)-->D(*)(s)gamma, D(sJ)(2457)-->D(*)(s)gamma, D(sJ)(2457)-->D(s)pi(0), and D(sJ)(2457)-->D(s)pi(+)pi(-).

Journal Article↗
PubMed2003

Observation of B-->K*l+l-.

We report the observation of the flavor-changing neutral current decay B-->K(*)l(+)l(-) and an im-proved measurement of the decay B-->Kl(+)l(-), where l represents an electron or a muon, with a data sample of 140 fb(-1) accumulated at the Upsilon(4S) resonance with the Belle detector at KEKB. The results for the branching fractions are B(B-->K(*)l(+)l(-))=(11.5(+2.6)(-2.4)+/-0.8+/-0.2)x10(-7) and B(B-->Kl(+)l(-))=(4.8(+1.0)(-0.9)+/-0.3+/-0.1)x10(-7), where the first error is statistical, the second is systematic and the third is from model dependence.

Journal Article↗
PubMed2003

Observation of a narrow charmoniumlike state in exclusive B+/--->K+/-pi+pi-J/psi decays.

We report the observation of a narrow charmoniumlike state produced in the exclusive decay process B+/--->K+/-pi(+)pi(-)J/psi. This state, which decays into pi(+)pi(-)J/psi, has a mass of 3872.0+/-0.6(stat)+/-0.5(syst) MeV, a value that is very near the M(D0)+M(D(*0)) mass threshold. The results are based on an analysis of 152M B-Bmacr; events collected at the Upsilon(4S) resonance in the Belle detector at the KEKB collider. The signal has a statistical significance that is in excess of 10sigma.

Journal Article↗
PubMed2003

Evidence for B-->phiphiK.

We report evidence for the decay mode B-->phiphiK based on an analysis of 78 fb(-1) of data collected with the Belle detector at KEKB. This is the first example of a b-->sssss transition. The branching fraction for this decay is measured to be B(B+/--->phiphiK+/-)=(2.6(+1.1)(-0.9)+/-0.3)x10(-6) for a phiphi invariant mass below 2.85 GeV/c(2). Results for other related charmonium decay modes are also reported.

Journal Article↗
PubMed2003

Observation of B-/+-->rho-/+rho0 decays.

We report the first observation of the charmless vector-vector decay process B-/+-->rho(-/+)rho(0). The measurement uses a 78 fb(-1) data sample collected with the Belle detector at the KEKB asymmetric e(+)e(-) collider operating at the Upsilon(4S) resonance. We obtain a branching fraction of B(B-/+-->rho(-/+)rho(0))=[31.7+/-7.1(stat)+3.8-6.7(syst)]x10(-6). An analysis of the rho helicity-angle distributions gives a longitudinal polarization fraction of Gamma(L)/Gamma=0.95+/-0.11(stat)+/-0.02(syst). We also measure the direct-CP-violating asymmetry A(CP)(B-/+-->rho(-/+)rho(0))=0.00+/-0.22(stat)+/-0.03(syst).

Journal Article↗
PubMed2003

Measurement of branching fractions and polarization in B-->phiK(*) decays.

We present the first measurement of decay amplitudes in B-->phiK* and measurements of branching fractions in B-->phiK(*) decays based on 78.1 fb(-1) of data recorded at the Upsilon(4S) resonance with the Belle detector at the KEKB e+e- storage ring. The decay amplitudes for the different phiK*0 helicity states are measured from the angular distributions of final state particles in the transversity basis. The longitudinal and transverse complex amplitudes are |A0|2=0.43+/-0.09+/-0.04, |A(perpendicular)|2=0.41+/-0.10+/-0.04, arg((A(parallel))=-2.57+/-0.39+/-0.09, and arg((A(perpendicular))=0.48+/-0.32+/-0.06. The direct CP-violating asymmetries are found to be consistent with zero.

Journal Article↗
PubMed2003

Observation of B0 -->D0K0 and B0 -->D0K*0 decays.

We report on a search for B(0)-->D(*0)K(*0) decays based on 85 x 10(6) BB events collected with the Belle detector at KEKB. The B(0)-->D0K(0) and B(0)-->D0K(*0) decays have been observed for the first time with the branching fractions B(B(0)-->D0K(0))=(5.0(+1.3)(-1.2)+/-0.6)x10(-5) and B(B(0)-->D0K(*0))=(4.8(+1.1)(-1.0)+/-0.5)x10(-5). No significant signal has been found for the B(0)-->D(*0)K*0) and B(0)-->D(*0)K(*0) decay modes, and upper limits at 90% C.L. are presented.

Journal Article↗
PubMed1991

[Use of temporary crowns for corrections of malocclusions during the deciduous dentition in children with cleft lips and palates].

Diagnosis and correction of the a priori not normal development of the dentition in cleft palate children is of utmost importance in the primary dentition. Secondary preventive dental care using uncomplicated procedures is one of the most rewarding responsibilities in cleft orthopedics. Aesthetics in dentistry is stressed and cleft palate children should not be excluded out of consideration for their parents. A technical modification of the inclined plane using only tooth coloured materials for the treatment of sagittal and transverse anomalies of the primary dentition is presented. Case reports include a patient with a genetic disposition for anomalies in the ipsilateral maxillary quadrant.

Child, Preschool↗
PubMed1990

[The treatment of children with cheilognathopalatoschisis--a contribution to psychosocial rehabilitation].

The long-term treatment of cleft palate patients starts immediately after birth and is pursued in orderly fashion [correction of persecuted orderly] to adolescence. The results of anonymous survey of the opinion of parents of cleft palate children who undergo or underwent early treatment procedures, up to seven years of age, are presented. Questions concerned mother's or parent's experience of birth, first medical information, early orthopedic care and treatment, and psychosocial adjustment of the children as well. This study suggests that objective findings in children and subjective conditions of parents do not correlate in the beginning, as is to be seen in cleft palate versus cleft lip palate group. One other conclusion indicates the existence of a small quantity of parents able to accept their affected child without additional problems arising from the cleft.

Adult↗
PubMed1990

[Oral stereotypes in school children].

When children are asked about school, most say they look forward to it. Not a few children, however, experience feelings of insecurity about school, and in particular starting school. Some are even afraid, and in some cases the child is unable to cope with its fears alone. An orthodontist must reckon with continual or periodical school problems when planning therapy. These difficulties are an essential element of the child's psycho-social world, although by no means the sole element. The relationship between oral stereotypes in school-age children and the necessity of parent counseling or psychological/psychiatric aid for the child is investigated on the basis of clinical reports.

Child↗
PubMed1990

[Oral habits in small children].

The correction of oral stereotypes when children still have their milk teeth is known to be a rewarding measure in the prophylaxis of dental anomalies. Based on clinical examples, questions concerning the methodology and necessity of mechanical intervention are discussed along with favourable times for such action. The casuistic discussion supports the following conclusions: 1. Oral stereotypes that remain persistent beyond the third year do not necessarily lead to dentition deformities. 2. The favourable moment to offer small children aid in getting rid of their habit is not necessarily a matter of chronological or dental age, but depends rather more on the phase of personality development the child is going through at the time.

Behavior Therapy↗
PubMed1989

[Syndrome patients within the framework of the early orthodontic treatment of infants with cheilognathopalatoschisis].

The orthodontist's early orthopaedic treatment of the newborn focuses on cleft palate infants and children with Down's syndrome. In more than 100 malformation syndromes, orofacial clefting occurs. The problem of syndrome diagnosis is discussed by way of clinical examples (Robin syndrome, Stickler syndrome). A case of orofacial digital syndrome serves to demonstrate the orthodontists contribution to syndromic diagnosis in early cleft rehabilitation.

Cleft Lip↗
PubMed1989

[Secondary prevention of mesial bite in infants with maxillary clefts by correcting early deciduous prenormal incisors].

A new application of the inclined plane principle for the management of mesial bite in a child aged 14 months is reported. It was of interest to note that, inspite of the presence of Robin's sequence associated with cleft palate and postnormal mandible and inspite of posteriorly directed stresses on the mandible generated by sucking, the deciduous incisors were prenormal at the very time of their eruption. In light of the growth arresting effect of palatal clefts the authors emphasize the importance of regular orthodontic care in cleft patients beyond early orthodontic treatment throughout dental development in order to prevent the occurrence of developmental anomalies.

Cleft Palate↗