Jonas Medbo

• Senior Specialist in Applied Propagation at Ericsson

The ITU-R 1 has recently published a new Recommendation giving a method for the estimation of building entry loss at frequencies between 100 MHz and 100 GHz. This paper describes the derivation and form of the new model and highlights work that remains to be done in this area.

This paper analyzes the frequency dependency of the radio propagation channel's root mean square (rms) delay spread (DS), based on the multi-frequency measurement campaigns in the mmMAGIC project. The campaigns cover indoor, outdoor, and outdoor-to-indoor (O2I) scenarios and a wide frequency range from 2 to 86 GHz. Several requirements have been id...

This paper presents a channel model for the fifth generation (5G) air interface evaluations. The described model covers frequency bands from typical cellular frequencies up to millimetre waves and a variety of different environments, with emphasis on the urban outdoor. The model enables assessment of single radio links with, e.g., the massive multi...

This deliverable describes the extensive multi-frequency channel measurement and simulation campaigns conducted in the mmMAGIC project, covering mm-wave 5G propagation scenarios. The data is evaluated to characterize environment-specific propagation effects. Based on the findings, refined modelling approaches are developed and embedded in a geometr...

The standardization of the next generation 5G radio access technology has just started in 3GPP with the ambition of making it commercially available by 2020. There are a number of features that are unique for 5G radio access compared to the previous generations such as a wide range of carrier frequencies and deployment options, diverse use cases wi...

Written by leading experts in 5G research, this book is a comprehensive overview of the current state of 5G. Covering everything from the most likely use cases, spectrum aspects, and a wide range of technology options to potential 5G system architectures, it is an indispensable reference for academics and professionals involved in wireless and mobi...

This article first identifies requirements of 5G radio propagation models for relevant propagation scenarios and link types derived from the analysis of recently discussed 5G visions and respective 5G technology trends. A literature survey reveals that none of the state-of-the-art propagation models such as WINNER/IMT-Advanced, COST 2100, and IEEE...

In this report, the end user scenarios, test cases and requirements envisioned by the METIS project are mapped to propagation scenarios. Furthermore they are analysed for deriving a new set of requirements relevant for radio channel and propagation modelling. Since none of the existing channel models in the literature satisfies all these requiremen...

An antenna (100,200,300, 400, 500) comprising first (110, 210, 310, 410, 430) and second (120, 220, 320, 420, 440) structures for guiding electromagnetic waves, each comprising groups (111, 130, 150, 230, 330; 140,160, 240, 340, 445, 470) of radiation elements. For adjacent sections in 5 the structures, at least one applies: ?Groups of radiation el...

In this report, the results of the measurement campaigns are provided based on the propagation scenarios defined in METIS project. Channel modelling approaches are discussed and the Initial METIS Channel Model is described in detail. The initial METIS channel model includes both stochastic (generic) and map-based (site-specific) models. Moreover, t...

The main objective of this paper is to present major challenges regarding the fifth generation (5G) mobile communications propagation modelling work in the European 7 th framework project METIS (Mobile and wireless communications Enablers for the Twenty-twenty Information Society). The goal of the propagation work in METIS is to provide adequate pr...

The demand for wireless channel models, including realistic user environments, is increasing. This motivates the work on more detailed models that are reasonably simple and tractable but with adequate statistical performance. In this paper, we present an investigation of the spatial outdoor-to-in-car radio channel at 2.6 GHz. Specifically, we inves...

It has herein been shown that the stationary UE scenario is radically different from the moving UE scenario. The main difference is that the temporal fading for a stationary UE, in a rich scattering environment, is typically very small having Ricean statistics with large K values (K>10dB). This is in contrast to the traditional channel modeling sce...

Capacity improvement of intrasite cooperative multiple-input–multiple-output (MIMO) using all three 120$^{\circ}$ sectors of a base station (BS) site is studied for the first time in a measured urban environment at 2.65 GHz. The results show that the mean uplink capacity gain exceeds 40% in as much as 1/4 of the coverage area, relative to the best...

This letter explores the potential benefits of cooperative multiple-input-multiple-output (MIMO) signaling from three coherent base stations to a single four-antenna mobile station using channel measurements in an urban macrocellular environment at 2.66 GHz. The analysis compares the performance when the cooperative base stations have no informatio...

This study has been performed in order to improve the understanding of the performance of leaky feeders used in MIMO radio access deployments. In order to achieve this, a measurement campaign has been conducted in an indoor office environment at 2.4 GHz. Several configurations of leaky feeders as well as dipole antennas (as a reference case) have b...

The objective of this paper is to improve the knowledge on directional channel characteristics at the base station, particularly concerning elevation. For this purpose a channel measurement campaign has been performed. A powerful new method for super-resolution channel estimation has been used to get a detailed picture of the directional characteri...

The paper examines the impact of Rician fading on the orthogonality of dual-polarized MIMO channels in a measured urban macrocellular scenario. The measurements confirm the previous finding that the Rician k-factors of the cross-polarized channels are strongly correlated to those of the co-polarized channels. However, the Rician k-factors do not in...

This paper shows results for channel extrapolation in both spatial and frequency domain, based on real measurements in an indoor office environment. Using a network analyzer, and measurement robots with very precise movement steps, channel data over a frequency span of 50MHz has been colleted in a large spatial volume. By using some key parameters...

This paper presents a novel approach to substantially improve the efficiency as well as the accuracy of maximum likelihood based super resolved channel estimation. Ordinary maximum likelihood methods suffer from considerable computational complexity as hundreds of coupled discrete waves have to be estimated simultaneously. Standard methods are eith...

We study the potential benefits of cooperative multiple-input multiple-output signaling from multiple coherent base stations with one or more mobile stations in an urban macrocellular environment at 2.66 GHz. The analysis uses fully-coherent measurements of the channel from three base stations to a single mobile station equipped with four antennas....

The behavior of the path loss between two base stations has been investigated via measurements using one fixed transmitter and a helicopter-borne receiver. This has allowed the gathering of data for a range of distances and antenna heights, including beyond horizon conditions and antennas below and above the clutter. The data has been compared with...

We study the potential benefits of cooperative multiple-input multiple-output signaling from multiple coherent base stations with one or more mobile stations in an urban macrocellular environment. The analysis uses novel and fully-coherent measurements of the channel from three base stations to a single mobile station equipped with four antennas. T...

Multi-site measurements for urban macro cells at 2.66 GHz are performed with three base stations and one mobile station. In order to analyze the correlation properties of large scale parameters, we split up the routes into subsets, where it can be assumed that wide-sense stationarity (WSS) applies. The autocorrelation distance and correlation prope...

In this paper, we perform an experimental MIMO wireless channel characterization in an outdoor environment. We use the data acquired during wideband channel measurement campaigns made in Kista, Stockholm, Sweden. In order to predict the impact of DOA distribution and polarization diversity on the channel capacity, we have chosen specific measuremen...

In this paper, we study the potential benefits of downlink cooperative MIMO systems in cellular macrocell environments using a coherent measurement setup. Our results reveal that one of the two measured routes can leverage comparable signal strengths from the cooperating base stations to the mobile station and provide up to two-fold single user bit...

The main goals of this work is to gain understanding of antenna coupling in real propagation environments and to assess the possibility to separately model the antenna and the propagation channel. It is shown that ideal antenna coupling modeling is accurate also for real dipole antennas. Further it is indeed validated that antenna and propagation c...

The goal with this work is to evaluate the performance of the observed time difference of arrival (OTDOA) positioning method using real measured channel data in a macro-cellular urban LTE scenario. This has been made possible using a highly accurate channel sounder developed within Ericsson Research. A wideband (20 MHz bandwidth) measurement campai...

Multi-frequency path loss measurements have been conducted in an outdoor to indoor macrocellular scenario. Four discrete CW signals were transmitted in the band 460-5100 MHz from the roof of a 29 meters tall building. The loss was measured inside and outside 5 different buildings at distances up to 600 m from the base station. Excess and building p...

The immediate environment of the transmit (TX) and receive (RX) antennas, including the antenna casings and the users holding the antennas, has a strong impact on the propagation channel and thus on wireless systems. In this paper we experimentally evaluate a method that synthetically combines double-directional measurements of the propagation chan...

Narrowband and wideband measurements of the radio channel using different combinations of transmit and receive polarization have been performed. The measurements cover a range of scenarios including urban, suburban and open terrain, as well as both outdoor and indoor terminals. The vertical-to-vertical (V-V) and horizontal-to-horizontal (H-H) polar...

This paper is intended to validate the 3GPP spatial channel model (SCM) and the corresponding WINNER wideband extension (SCME) by comparisons with measurement data. Basically the models are validated. The main channel characteristics in terms of angular, delay and polarimetric distributions are confirmed. Moreover, the corresponding MIMO channel ca...

This paper reports on a set of channel models that have been proposed for the evaluation of system concepts for the long-term evolution of third generation mobile communications systems. Conflicting requirements between simplicity of implementation and accuracy in reproducing the radio channel are presented, and the resulting modeling choices are d...

To study the carrier frequency effects on path loss, measurements have been conducted at four discrete frequencies in the range 460-5100 MHz. The transmitter was placed on the roof of a 36 meters tall building and the receive antennas were placed on the roof of a van. Both urban and suburban areas were included in the measurement campaign. The resu...

First Page of the Article

An update of the searches for charginos and neutralinos in DELPHI is presented, based mainly on recent data collected at centre-of-mass energies of 161 GeV and 172 GeV. No signal is found. For a sneutrino with mass above 300 GeV/c 2 and a mass difference between the chargino and the lightest neutralino above 10 GeV/c 2, the lower limit at 95% confi...

Measurements of radio channels with 100 MHz bandwidth at 5.25 GHz have been performed in both indoor and outdoor environments. The statistical properties of the tap amplitudes have been analyzed together with general channel characteristics, such as path loss, delay spread and coherence bandwidth. With 100 MHz bandwidth, it was found that the avera...

In wireless communications, stationary terminal scenarios are becoming increasingly important as bitrates goes up. Consequently, the need to improve the knowledge about the channel behavior and to develop realistic channel models for these scenarios is also increasing. The present work comprises both measurements and modeling of the radio channel w...

Narrowband MIMO channel measurements at 1947 MHz have been performed in an urban macrocellular outdoor-indoor scenario. The spatial characteristics of the channel have been analyzed, showing an angular spread of 5-10° at the base station and 30-60° at the mobile station. The maximum theoretical capacity that the channel can support has been evaluat...

The approach presented herein provides a simple and accurate propagation model for indoor environments. The model is able to generate point sources with joint angle-delay-power characteristics that are sensitive to the macrostructure of the site's floorplan geometry. This is achieved in two stages. First, the floorplan geometry is reduced to an ess...

In order to assess important direction-delay indoor propagation characteristics, a combined wideband and 3D spatial channel measurement campaign has been performed in the frequency band 5.1-5.3 GHz (HIPERLAN type 2 band) in a modern office building. Non- line-of-sight (NLOS) measurements in a corridor environment on a single floor and measurements...

Measurements of the trilinear gauge boson couplings $WW\gamma$ and $WWZ$ are presented using the data taken by DELPHI in 1998 at a centre-of-mass energy of 189~GeV and combined with DELPHI data at 183~GeV. Values are determined for \Dgz\ and \Dkg, the differences of the $WWZ$ charge coupling and of the $WW\gamma$ dipole coupling from their Standard...

In order to assess important path loss characteristics in typical WLAN scenarios extensive measurements have been performed at 5.2 GHz (a frequency in the HIPERLAN type 2 band) in one modern office building and in a school built in 1950. Both buildings have essentially the same interior topology, i.e. rooms on both sides along a straight corridor....

In order to characterize the radio channel in typical WLAN scenarios a wideband measurement campaign at 5 GHz has been carried through. Four offices and two large open space environments have been investigated. Impulse response shape and fading statistics have been analyzed. Moreover, the Doppler characteristics have been studied. It was found that...

The transverse, longitudinal and asymmetric components of the fragmentation function are measured from the inclusive charged particles produced in $e^+e^-$ collisions at LEP. As in deep inelastic scattering, these data are important for tests of QCD. The transverse $\sigma_T$ and longitudinal $\sigma_L$ components of the total hadronic cross sectio...

The transverse, longitudinal and asymmetric components of the fragmentation function are measured from the inclusive charged particles produced in e+e- collisions at LEP. As in deep inelastic scattering, these data are important for tests of QCD. The transverse σΤ and longitudinal σL components of the total hadronic cross section σtot are evaluated...

The splitting processes in identified quark and gluon jets are investigated using longitudinal and transverse observables. The jets are selected from symmetric three-jet events measured in Z decays with the DELPHI detector in 1991-1994. Gluon jets are identified using heavy quark anti-tagging. Scaling violations in identified gluon jets are observe...

From a data sample of $9.98 {\mathrm{~pb^{-1}}}$ integrated luminosity collected by DELPHI at a centre-of-mass energy of 172 GeV, 118 events were selected as W-pair candidates. From these, the branching fraction ${\mathrm Br}({\mathrm W} \rightarrow {\mathrm q}\bar{\mathrm q})$ was measured to be $0.660^{+0.036}_{-0.037} (\mathrm{stat.}) \pm 0.009...

The DELPHI experiment at LEP has measured the inclusive charmless B hadron decay branching ratio, the B branching ratio into two charmed particles, and the total number of charmed particles per B decay, using the hadronic Z data taken between 1992 and 1995. The results are extracted from a fit to the b-tagging probability distribution based on the...

The DELPHI experiment at LEP has measured the inclusive charmless $B$ hadron decay branching ratio, the $B$ branching ratio into two charmed particles, and the total number of charmed particles per $B$ decay, using the hadronic Z data taken between 1992 and 1995. The results are extracted from a fit to the $b$-tagging probability distribution based...

Using D *+ mesons exclusively reconstructed in the DELPHI detector at LEP, an excess of 66 ± 14(stat.) events is observed in the D *+π+ π- final state with a mass of 2637 ± 2(stat.) ± 6(syst.) MeV/c2 and a full width smaller than 15 MeV/c2 (95% C.L.). This signal is compatible with the expected decay of a radially excited D *′ (JP = 1-) meson.

Using D$^{*+}$ mesons exclusively reconstructed in the DELPHI detector at LEP, an excess of $66\pm14(\mbox{stat.})$ events is observed in the D$^{*+}\pi^+\pi^-$ final state with a mass of $2637\pm2(\mbox{stat.})\pm6(\mbox{syst.})$~MeV/$c^2$ and a full width smaller than 15~MeV/$c^2$ (95\% C.L.). This signal is compatible with the expected decay of...

From the Z decays recorded in 1994 and 1995 by the DELPHI detector at LEP, the charged particle multiplicity of weakly decaying B hadrons was measured to be:4.97±0.03±0.06excluding the K0 and Λ decay products.

Trilinear gauge boson couplings are measured using data taken by DELPHI at 161 GeV and 172 GeV, Values for WWV couplings (V = Z,gamma) are determined from a study of the reactions e(+)e(-) --> W+W- and e(+)e(-) --> We nu, using differential distributions from the WW final state in which one W decays hadronically and the other leptonically, and tota...

This paper presents results on charged Higgs boson production, based on LEP data collected at GeV, that complement the previous DELPHI results obtained at centre of mass energies up to 161 GeV. The charged Higgs bosons are assumed to be pair produced and to decay either into a quark pair or into τντ. The three different possible final states are in...

The value of the b quark mass at the MZ scale defined in the renormalization scheme, mb(MZ), was determined using 2.8 million hadronic Z decays collected during 1992-1994 by the DELPHI detector to beThe analysis considers NLO corrections to the three-jet production rate including mass effects, and the result obtained agrees with the QCD prediction...

In an analysis of multihadronic events recorded at LEP by DELPHI in the years 1992 through 1994, rapidity correlations of Λ-Λ, proton-proton, and Λ-proton pairs are compared with each other and with the predictions of the string fragmentation model. For Λ pairs, the additional correlation with respect to charged kaons is also analysed.

In an analysis of multihadronic events recorded at LEP by DELPHI in the years 1992 through 1994, charged hadrons are identified using the measurement of their energy loss and their Cherenkov angle. Rapidity correlations of \La-\La, proton-proton, and \La-proton pairs are compared. The agreement with the string and cluster fragmentation models is te...

A search for neutral and charged Higgs bosons has been performed in the data collected by the {\sc DELPHI} detector at centre-of-mass energies of 161~GeV and 172~GeV. The analysis assumes either the pair-production of charged Higgs bosons, ${\mathrm H}^{\pm}$, or the production of the lightest neutral Higgs boson, h, with either a Z or a neutral ps...

From the $Z$ decays recorded in 1994 and 1995 by the DELPHI detector at LEP, the charged particle multiplicity of weakly decaying $B$ hadrons was measured to be: \begin{center} $4.97 \pm 0.03 \pm 0.06 \, ,$ \end{center} \noindent excluding the $K^0$ and $\Lambda$ decay products.

This paper presents results on charged Higgs boson production, based on LEP data collected at $\sqrt{s} = 172$ GeV, that complement the previous DELPHI results obtained at centre of mass energies up to 161 GeV. %The analysis is based on LEP data collected at $\sqrt{s} = 172$ GeV. The charged Higgs bosons are assumed to be pair produced and to decay...

The data collected by DELPHI in 1996 have been used to measure the average charged particle multiplicities and dispersions in $q\bar{q}$ events at centre-of-mass energies of $\sqrt{s}=161$~GeV and $\sqrt{s}=172$~GeV, and the average charge multiplicity in WW events at $\sqrt{s}=172$~GeV. The multiplicities in $q\bar{q}$ events are consistent with t...

An update of the searches for charginos and neutralinos in DELPHI is presented, based mainly on recent data collected at centre-of-mass energies of 161~GeV and 172~GeV. No signal is found. %Except for the case of tan$\beta$ $\approx$ 1, $|\mu| \sim 0$, %$M_2 \sim 0$, the lower limit on the chargino mass at 95\% confidence level %for a heavy sneutri...

The hadronic structure of the decay of the $\tau$ lepton to three charged particles, $\tau\rightarrow 3\pi\nu_\tau$, is studied using data collected by the DELPHI detector at LEP between 1992 and 1995. The invariant mass of the $3\pi$ system, $m_{3\pi}$, is fitted using the models of KÏhn and Santamaria, Isgur Morningstar and Reader, and Feindt. Th...

In an analysis of multihadronic events recorded at LEP by DELPHI in the years 1992 through 1994, charged hadrons are identified using the measurement of their energy loss and their Cherenkov angle. Rapidity correlations of \La-\La, proton-proton, and \La-proton pairs are compared. The agreement with the string and cluster fragmentation models is te...

From a data sample of 9.98 pb-1 integrated luminosity, collected by DELPHI at a centre-of-mass energy of 172 GeV, 118 events were selected as W-pair candidates. From these, the branching fraction Br(W ->q ) was measured to be 0.660+0.036-0.037 ( {stat.}) +/- 0.009 ( {syst.}) and the cross-section for the doubly resonant process hrm e+ e- -> W+ W- t...

This paper presents results on charged Higgs boson production, based on LEP data collected at $\sqrt{s} = 172$ GeV, that complement the previous DELPHI results obtained at centre of mass energies up to 161 GeV. %The analysis is based on LEP data collected at $\sqrt{s} = 172$ GeV. The charged Higgs bosons are assumed to be pair produced and to decay...

From a data sample of $9.98 {\mathrm{~pb^{-1}}}$ integrated luminosity collected by DELPHI at a centre-of-mass energy of 172 GeV, 118 events were selected as W-pair candidates. From these, the branching fraction ${\mathrm Br}({\mathrm W} \rightarrow {\mathrm q}\bar{\mathrm q})$ was measured to be $0.660^{+0.036}_{-0.037} (\mathrm{stat.}) \pm 0.009...

The splitting processes in identified quark and gluon jets are investigated using longitudinal and transverse observables. The jets are selected from symmetric three-jet events measured in Z decays L with the {\sc Delphi} detector in 1991-1994. Gluon jets are identified using heavy quark anti-tagging. Scaling violations in identified gluon jets are...

The 4-jet events collected by the DELPHI experiment at LEP1 in 1992, 1993 and 1994 are analysed to determine the contribution of the triple-gluon vertex. Two of the four jets are tagged as jets from b- or c-quarks using lifetime and lepton transverse momentum information. The 4-jet contributions from double-gluon bremsstrahlung, the triple-gluon ve...

Oscillations of B0s mesons were studied in events with a large transverse momentum lepton selected from 3.2 million hadronic Z0 decays registered by DELPHI between 1991 and 1994. A limit on the mass difference between the physical B0s stateswas obtained by combining the results obtained in three channels.

Analysis of the rapidity structure of charge correlations in hadronic events from Z0 decays gives evidence for chain-like charge-ordering of particle production along the thrust axis, as predicted by ‘QCD-motivated’ string-like fragmentation models.

An inclusive measurement of the average multiplicity of pairs from gluons, , in hadronic Z0 events collected by the DELPHI experiment at LEP, is presented. A counting technique, based on jet b-tagging in 4-jet events, has been used. Looking for secondary bottom production in events with production of any primary flavour, by requiring two b-tagged j...

Correlations between pions from different W's in e+e− →W+W− events are studied using data collected by the DELPHI detector at LEP running at a centre-of-mass energy of 172 GeV in 1996. At the present level of statistics, no enhancement of the correlation function above that expected from a pair of uncorrelated W's is observed at small values of the...

A sample of about 1.4 million hadronic Z decays, selected among the data recorded by the DELPHI detector at LEP during 1994, was used to measure for the first time the momentum spectra of K+, K0, p, Λ and their antiparticles in gluon and quark jets. As observed for inclusive charged particles, the production spectra of identified particles were fou...

A sample of about 1.4 million hadronic Z decays, selected among the data recorded by the DELPHI detector at LEP during 1994, was used to measure for the first time the momentum spectra of K+, K0, p, Λ and their antiparticles in gluon and quark jets. As observed for inclusive charged particles, the production spectra of identified particles were fou...

Data are presented on the reaction \epem~\into~\gamma + no other detected particle at center-of-mass energies, \sqs = 89.48 GeV, 91.26 GeV and 93.08 GeV. The cross section for this reaction is related directly to the number of light neutrino generations which couple to the \zz boson, and to several other phenomena such as excited neutrinos, the pro...

The hadronic fragmentation functions of the various quark flavours and of gluons are measured in a study of the inclusive hadron production from Z0 decays with the DELPHI detector and are compared with the fragmentation functions measured elsewhere at energies between 14 GeV and 91 GeV. A large scaling violation is observed, which is used to extrac...

A search for stable or long-lived heavy charged particles in $e^+e^-$ interactions at energies of 130-136, 161 and 172 GeV has been performed using the data taken by the DELPHI experiment at LEP. The search is based on particle identification provided by the Time Projection Chamber and the Ring Imaging Cherenkov detector. Upper limits at 95\% confi...

From data recorded by DELPHI between 1991 and 1994, which correspond to 3.2 million hadronic $\mbox{Z}^0$ decays, a measurement of the $\Bdb$ meson lifetime has been performed based on the inclusive reconstruction of $3520 \pm 150$ semileptonic decays of the type \bc $\Bdb \rightarrow \Dstarp ~X~\ell^-~ \overline{\nu_{\ell}}, $ \ec The result is: \...

Weak isosinglet Neutral Heavy Leptons ($\nu_m$) have been searched for using data collected by the DELPHI detector corresponding to $3.3\times 10^{6}$ hadronic Z$^{0}$ decays at LEP1. Four separate searches have been performed, for short-lived $\nu_m$ production giving monojet or acollinear jet topologies, and for long-lived $\nu_m$ giving detectab...

A search with the DELPHI detector at LEP for excited leptons ($e^*$, $\mu^*$, $\tau^*$ and $\nu^*$) decaying through $\gamma$, W or Z transitions is reported. The data used correspond to an integrated luminosity of 10 pb$^{-1}$ at an $e^+e^-$ centre-of-mass energy of 161 GeV. The search for pair produced excited leptons established the limits $m_{e...

In 1996 LEP ran at a centre-of-mass energy of 161 GeV, just above the threshold of W-pair production. DELPHI accumulated data corresponding to an integrated luminosity of 9.93 pb−1, and observed 29 events that are considered as candidates for W-pair production. From these, a cross-section for the doubly resonant e+e− → WW process of 3.67−0.85+0.97...

In a sample of 3.02 million hadronic Z0 decays collected by the DELPHI detector, 270 J/ψ -> l+l- candidates have been selected. A search for fully reconstructed B+/-c mesons has yielded oneB+/-c -> J/ψ π+/- candidate, no B+/-c ->J /ψ l+/- νl candidates, and one B+/-c -> J/ψ π+π-π+/- candidate, consistent with expected background in each channel. Th...

The spin density matrix elements for the ρ0, K*0(892) and φ produced in hadronic Z0 decays are measured in the DELPHI detector. There is no evidence for spin alignment of the K*0(892) and φ in the region xp <= 0.3 (xp = p/pbeam), where ρ00 = 0.33 +/- 0.05 and ρ00 = 0.30 +/- 0.04, respectively. In the fragmentation region, xp >= 0.4, there is some i...

A sample of 25000 Z(0) --> tau(-)tau(+) events collected by the DELPHI experiment at LEP in 1991 and 1992 is used to measure the leptonic branching fractions of the tau lepton. The results are B(tau --> e nu<(nu)over bar>) = (17.51+/-0.39)% and B(tau --> mu nu<(nu)over bar>) = (17.02+/-0.31)%. The ratio of the muon and electron couplings to the wea...

Inclusive charged particle and event shape distributions are measured using 321 hadronic events collected with the DELPHI experiment at LEP at effective centre of mass energies of 130 to 136 GeV. These distributions are presented and compared to data at lower energies, in particular to the precise Z data. Fragmentation models describe the observed...

In a sample of 3.02 million hadronic $Z^o$ decays collected by the DELPHI detector, 270 $J/\psi \into$ \lplm candidates have been selected. A search for fully reconstructed $B_c\upm$ mesons has yielded one $B_c\upm\to J/\psi ~\pi\upm$ candidate, no $B_c\upm \into J/\psi ~\ell\upm ~\nu_\ell$ candidates, and one $B_c\upm \into J/\psi ~\pi^+~\pi^- ~\p...