A. De Min

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Rocío Abascal-Mena

Universidad Autónoma Metropolitana-Cuajimalpa

Peter Mikulecký

University of Hradec Králové

Santiago Negrete-Yankelevich

Universidad Autónoma Metropolitana-Cuajimalpa

Heba Alagha

Acibadem University

Paullo Eduardo

Universidade Federal do Ceará

Javier Pereira

Universidad de Santander UDES

Martin Hunter

Tufts University

Myzafere Limani

University of Prishtina

Alexander Avramov

Massachusetts Institute of Technology (MIT)

Christopher Jeynes

University of Surrey

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Papers by A. De Min

Measurement of inclusive pi(0) production in hadronic Z(0) decays

Zeitschrift Fur Physik C-Particles and Fields, 1996

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Energy dependence of the differences between the quark and gluon jet fragmentation

Zeitschrift Fur Physik C-Particles and Fields, 1996

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Search for new phenomena using single photon events at LEP1

Zeitschrift Fur Physik C-Particles and Fields, 1997

Data are presented on the reaction e + e ! + no other detected particle at center-of-mass energie... more Data are presented on the reaction e + e ! + no other detected particle at center-of-mass energies, p s = 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 Z 0 boson, and to several other phenomena such as excited neutrinos, the production of an invisible `X' particle, a possible magnetic moment of the tau neutrino, and neutral monojets. Based on the observed number of single photon events, the number of light neutrinos which couple to the Z 0 is measured to be N = 3.15 0.34. No evidence is found for

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Search for B-s(0)-(B-s(0))over-bar oscillations

Physics Letters B, 1997

Oscillations of B 0 s mesons were studied in events with a large transverse momentum lepton selec... more Oscillations of B 0 s mesons were studied in events with a large transverse momentum lepton selected from 3.2 million hadronic Z 0 decays registered by DELPHI between 1991 and 1994. A limit on the mass dierence between the physical B 0 s states m s > 6:5 p s 1 at 95% C.L. was obtained by combining the results obtained in three channels.

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Measurement of correlations between pions from different W's in e(+)e(-)->W+W- events

Physics Letters B, 1997

Correlations between pions from dierent W s i n e + e ! W + W events are studied using data colle... more Correlations between pions from dierent W s i n 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 Ws is observed at small values of the four-momentum dierence of the pions.

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Search for supersymmetric partners of top and bottom quarks at root s=189 GeV

Physics Letters B, 2000

Searches for supersymmetric partners of top and bottom quarks are presented using data taken by t... more Searches for supersymmetric partners of top and bottom quarks are presented using data taken by the DELPHI experiment at LEP in 1997 and 1998. No deviations from standard model expectations are observed in these data sets, which are taken at centre-of-mass energies of 183 GeV and 189 GeV and correspond to integrated luminosities of 54 pb -1 and 158 pb -1 . These results are used in combination with those obtained by DELPHI at lower centre-of-mass energies to exclude regions in the squark-neutralino mass plane at 95% confidence level.

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Search for spontaneous R-parity violation at GeV and 189 GeV

Physics Letters B, 2001

√ s = 183 GeV and √ s = 189 GeV have been performed using the 1997 and 1998 DELPHI data, under th... more √ s = 183 GeV and √ s = 189 GeV have been performed using the 1997 and 1998 DELPHI data, under the assumption of R-parity breaking in the third lepton family. The expected topology for the decay of a pair of charginos into two acoplanar taus plus missing energy was investigated and no evidence for a signal was found. The results were used to derive a limit on the chargino mass and to constrain the allowed domains of the MSSM parameter space.

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Measurement of the e+e−→γγ(γ) cross section at the LEP energies

Physics Letters B, 1998

The total and the dierential cross-sections for the reaction e + e ! () have been measured with t... more The total and the dierential cross-sections for the reaction e + e ! () have been measured with the DELPHI detector at LEP at centre-of-mass energies from 130 to 183 GeV for an integrated luminosity of 78.19. pb 1 . The results agree with the QED predictions. The lower limits (obtained including previously published results at the Z 0 energies) on the QED cuto parameters are + > 253 GeV and > 225 GeV and the lower bound on the mass of an excited electron with an eective coupling constant = 1 is 231 GeV/c 2 . All the limits are at the 95% condence level.

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Observation of orbitally excited B mesons

Physics Letters B, 1995

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Measurement of the ZZ cross-section in e+e− interactions at 183–189 GeV

Physics Letters B, 2001

Measurements of on-shell ZZproduction are described, using data collected by DELPHI in 1997 and 1... more Measurements of on-shell ZZproduction are described, using data collected by DELPHI in 1997 and 1998, at centre-of-mass energies p s = 182.6 GeV and 188.6 GeV respectively. Results obtained in each of the nal states q qq q, + , q q, e + e , q q, q q, l + l , l + l , , and l + l , are presented. The measured cross-sections for on-shell ZZ production via the tree-level doubly-resonant graphs NC02 are:

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Performance of the DELPHI detector

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1996

DELPHI (DEtector with Lepton, Photon and Hadron Identification) is a detector for e+e-physics, de... more DELPHI (DEtector with Lepton, Photon and Hadron Identification) is a detector for e+e-physics, designed to provide high granularity over a 47r solid angle, allowing an effective particle identification. It has been operating at the LEP (Large Electron-Positron) collider at CERN since 1989. This article reviews its performance.

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Measurement of the photon structure functionF 2 ? in the reactione + e ??e + e ?+hadrons at LEP

Zeitschrift f�r Physik C Particles and Fields, 1994

We present measurements of the hadronic photon structure function F 2 (x), i n t w o Q 2 ranges w... more We present measurements of the hadronic photon structure function F 2 (x), i n t w o Q 2 ranges with mean values of 5:9 GeV 2 and 14:7 GeV 2 . The data were taken by the OPAL experiment at LEP, with p s close to the Z 0 mass and correspond to an integrated e + e luminosity of 44.8 pb 1 . In the context of a QCD-based model we nd the quark transverse momentum cuto separating the vector meson dominance (VMD) and perturbative QCD regions to be 0:270:10 GeV. We conrm that there is a signicant pointlike component of the photon when the probe photon has Q 2 > 4 GeV 2 . Our measurements extend to lower values of x than any previous experiment, and no increase of F 2 (x) is observed.

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First measurement of the strange quark asymmetry at the Z0 peak

Zeitschrift für Physik C Particles and Fields, 1995

Measurement of the average lifetime ofB hadrons

Zeitschrift f�r Physik C Particles and Fields, 1989

The average lifetime ofB hadrons has been measured by the TASSO collaboration using 110 pb-1 of d... more The average lifetime ofB hadrons has been measured by the TASSO collaboration using 110 pb-1 of data collected in 1986 at a center of mass energy of 35 GeV. Measurements by three different methods are presented and a method ofB-enrichment is discussed. The result of the impact parameter method is tB=1.36±0.13±0.28 ps, that of the vertex method is tB=1.30±0.10±0.28 ps

$Research paper thumbnail of Search for charged Higgs bosons in e+e− collisions at $\sqrt{s}=189\mbox{--}209\ \mbox{GeV}$$

Search for charged Higgs bosons in e+e− collisions at $\sqrt{s}=189\mbox{--}209\ \mbox{GeV}$

The European Physical Journal C, 2012

A search is made for charged Higgs bosons predicted by Two-Higgs-Doublet extensions of the Standa... more A search is made for charged Higgs bosons predicted by Two-Higgs-Doublet extensions of the Standard Model (2HDM) using electron-positron collision data collected by the OPAL experiment at √ s = 189-209 GeV, corresponding to an integrated luminosity of approximately 600 pb -1 . Charged Higgs bosons are assumed to be pairproduced and to decay into qq, τ ν τ or AW ± * . No signal is observed. Model-independent limits on the charged Higgsboson production cross section are derived by combining these results with previous searches at lower energies. Under the assumption BR(H ± → τ ν τ ) + BR(H ± → qq) = 1, motivated by general 2HDM type II models, excluded areas on the [m H ± , BR(H ± → τ ν τ )] plane are presented and charged Higgs bosons are excluded up to a mass of 76.

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Evidence for an excess of soft photons in hadronic decays of Z0

The European Physical Journal C, 2006

Soft photons inside hadronic jets converted in front of the DELPHI main tracker (TPC) in events o... more Soft photons inside hadronic jets converted in front of the DELPHI main tracker (TPC) in events of qq disintegrations of the Z 0 were studied in the kinematic range 0.2 < E γ < 1 GeV and transverse momentum with respect to the closest jet direction p T < 80 MeV/c. A clear excess of photons in the experimental data as compared to the Monte Carlo predictions is observed. This excess (uncorrected for the photon detection efficiency) is (1.17 ± 0.06 ± 0.27) × 10 -3 γ/jet in the specified kinematic region, while the expected level of the inner hadronic bremsstrahlung (which is not included in the Monte Carlo) is (0.340 ± 0.001 ± 0.038) × 10 -3 γ/jet. The ratio of the excess to the predicted bremsstrahlung rate is then (3.4 ± 0.2 ± 0.8), which is similar in strength to the anomalous soft photon signal observed in fixed target experiments with hadronic beams.

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Searches for supersymmetric particles in e + e- collisions up to 208 GeV and interpretation of the results within the MSSM

The European Physical Journal C, 2003

DELPHI data collected at centre-of-mass energies up to 208 GeV have been analysed to search for c... more DELPHI data collected at centre-of-mass energies up to 208 GeV have been analysed to search for charginos, neutralinos and sfermions in the framework of the Minimal Supersymmetric Standard Model (MSSM) with R-parity conservation. No evidence for a signal was found in any of the channels. The results of each search were used to derive upper limits on production cross-sections and masses. In addition, the combined result of all searches excludes regions in the parameter space of the constrained MSSM, leading to limits on the mass of the Lightest Supersymmetric Particle and other supersymmetric particles. All limits are given at 95% confidence level.

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Search for single top quark production via contact interactions at LEP2

The European Physical Journal C, 2011

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$Research paper thumbnail of Measurement of the $e^ + e^- \rightarrow W^ + W^-\gamma$ cross-section and limits on anomalous quartic gauge couplings with DELPHI$

Measurement of the $e^ + e^- \rightarrow W^ + W^-\gamma$ cross-section and limits on anomalous quartic gauge couplings with DELPHI

The European Physical Journal C, 2003

W + W -γ production at LEP2 is studied using data collected with the DELPHI detector at centre-of... more W + W -γ production at LEP2 is studied using data collected with the DELPHI detector at centre-of-mass energies between 189 GeV and 209 GeV, corresponding to an integrated luminosity of about 600 pb -1 . Cross-sections are measured for the production of W + W -with a hard, central and isolated photon in the final state, and are found to be compatible with the Standard Model prediction. The photon energy spectra are used to derive limits on anomalous contributions to the W + W -Z 0 γ and W + W -γγ vertices.

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Final results from DELPHI on the searches for SM and MSSM neutral Higgs bosons

The European Physical Journal C, 2004

A TS 5 7 U5 V1 W4 YX `S 5 87 C aD b4 c 1 d) e c c f 5 g9 hA @4 T1 32 Q ( pi qi r7 s D r7 tD F) 7 ... more A TS 5 7 U5 V1 W4 YX `S 5 87 C aD b4 c 1 d) e c c f 5 g9 hA @4 T1 32 Q ( pi qi r7 s D r7 tD F) 7 u ¡ ¤v w ¤x y ed gf ih 0j !d k ml on qp rn ts u ! ! n qp wv x p $y w z u ¡ ¤v w ¤x y p rn w{ l on qp wy ! a l on | } 0ũ w ~n w q x ! p p a $ ! n l on l n 0{ l z & p { q ! p y l on p z ! | pv o n p r z z n w w { | ! 0ũ w ~n F $ b n gv w ! x ! p p p v 0p rn gũ n U{ n B n y z p wp ¦n n & B n gp n n en ! 0h b n x l W ! B n n v z 0 p y ¡ 0¢ £ k ml on ũ y w z ¤ q ¥ ¦ ¥ § n n n u ! ©p rn ¦ l z ©¨n ¦ © o y ! ` | 0| s u ! p n qp ~n { q o 8 y v T © «ª v & p £ k ml on ¥¬ ! { e s ~n 0{ n n ¨n ® © n Uz p &p v 0 g l on | ! 0ũ ~n x p p @ p ¤ ¤ 0£ ¯¤ ° n @± ² ´³ £ ®v w z p n ! p ¦ B ¨n µ l on l n qp p { q ! ¶ ¨ ! 0~ up rn qv 0 p { g ¶ ¨x ! p p p y l on | 0| •£

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Measurement of inclusive pi(0) production in hadronic Z(0) decays

Zeitschrift Fur Physik C-Particles and Fields, 1996

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Energy dependence of the differences between the quark and gluon jet fragmentation

Zeitschrift Fur Physik C-Particles and Fields, 1996

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Search for new phenomena using single photon events at LEP1

Zeitschrift Fur Physik C-Particles and Fields, 1997

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Search for B-s(0)-(B-s(0))over-bar oscillations

Physics Letters B, 1997

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Measurement of correlations between pions from different W's in e(+)e(-)->W+W- events

Physics Letters B, 1997

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Search for supersymmetric partners of top and bottom quarks at root s=189 GeV

Physics Letters B, 2000

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Search for spontaneous R-parity violation at GeV and 189 GeV

Physics Letters B, 2001

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Measurement of the e+e−→γγ(γ) cross section at the LEP energies

Physics Letters B, 1998

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Observation of orbitally excited B mesons

Physics Letters B, 1995

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Measurement of the ZZ cross-section in e+e− interactions at 183–189 GeV

Physics Letters B, 2001

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Performance of the DELPHI detector

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1996

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Measurement of the photon structure functionF 2 ? in the reactione + e ??e + e ?+hadrons at LEP

Zeitschrift f�r Physik C Particles and Fields, 1994

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First measurement of the strange quark asymmetry at the Z0 peak

Zeitschrift für Physik C Particles and Fields, 1995

Measurement of the average lifetime ofB hadrons

Zeitschrift f�r Physik C Particles and Fields, 1989

$Research paper thumbnail of Search for charged Higgs bosons in e+e− collisions at $\sqrt{s}=189\mbox{--}209\ \mbox{GeV}$$

Search for charged Higgs bosons in e+e− collisions at $\sqrt{s}=189\mbox{--}209\ \mbox{GeV}$

The European Physical Journal C, 2012

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Evidence for an excess of soft photons in hadronic decays of Z0

The European Physical Journal C, 2006

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Searches for supersymmetric particles in e + e- collisions up to 208 GeV and interpretation of the results within the MSSM

The European Physical Journal C, 2003

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Search for single top quark production via contact interactions at LEP2

The European Physical Journal C, 2011

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$Research paper thumbnail of Measurement of the $e^ + e^- \rightarrow W^ + W^-\gamma$ cross-section and limits on anomalous quartic gauge couplings with DELPHI$

Measurement of the $e^ + e^- \rightarrow W^ + W^-\gamma$ cross-section and limits on anomalous quartic gauge couplings with DELPHI

The European Physical Journal C, 2003

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Final results from DELPHI on the searches for SM and MSSM neutral Higgs bosons

The European Physical Journal C, 2004

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