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Publications (17)

hep-ex2026

First Observation of an Exotic Reggeon

G. D. Alexeev, M. G. Alexeev, C. Alice +180

We present new \compass high-statistics measurements of the peripheral production of $I^\cdot I ¨ ^{-}$ and $I^\cdot^{'} I ¨ ^{-}$ pairs in the reactions $I ¨ ^{-} p \to I^\cdot^{(')} I ¨ ^{-} p$ . For the…

hep-ex2024

Measurement of the hard exclusive $I ¨ ^{0}$ muoproduction cross section at COMPASS

G. D. Alexeev, M. G. Alexeev, C. Alice +169

A new and detailed measurement of the cross section for hard exclusive neutral-pion muoproduction on the proton was performed in a wide kinematic region, with the photon virtuality…

cond-mat2001

Correlation gap in the optical spectra of the two-dimensional organic metal (BEDT-TTF)_4[Ni(dto)_2]

P. Haas, E. Griesshaber, B. Gorshunov +3

Optical reflection measurements within the highly conducting (a,b)-plane of the organic metal (BEDT-TTF)_4[Ni(dto)_2] reveal the gradual development of a sharp feature at around 20…

hep-ex2025

Spectroscopy of Strange Mesons and First Observation of a Strange Crypto-Exotic State with $J^{P} = 0^{-}$

G. D. Alexeev, M. G. Alexeev, C. Alice +160

We measured the strange-meson spectrum in the scattering reaction $K^{-} + p \to K^{-} I ¨ ^{-} I ¨ ^{-} + p$ with the COMPASS spectrometer at CERN. Using the world's largest sample…

hep-ex2023

Final COMPASS results on the transverse-spin-dependent azimuthal asymmetries in the pion-induced Drell-Yan process

G. D. Alexeev, M. G. Alexeev, C. Alice +180

The COMPASS Collaboration performed measurements of the Drell-Yan process in 2015 and 2018 using a 190 GeV/c $I ¨ ^{-}$ beam impinging on a transversely polarised ammonia target. Com…

cond-mat.other2007

Magneto-optic far-infrared study of Sr $_{14}$ Cu $_{24}$ O $_{41}$ : triplet excitations in chains

D. HÃ¼vonen, U. Nagel, T. RÃµÃµm +4

Using far-infrared spectroscopy we have studied the magnetic field and temperature dependence of the spin gap modes in the chains of Sr $_{14}$ Cu $_{24}$ O $_{41}$ . Two triplet modes T…

hep-ex2025

Dihadron Transverse-Spin Asymmetries in Muon-Deuteron Deep-Inelastic Scattering

G. D. Alexeev, M. G. Alexeev, C. Alice +168

In 2022, the COMPASS collaboration performed semi-inclusive measurements of deep-inelastic muon-scattering on a transversely polarised deuteron (6LiD) target. From these data, tran…

hep-ex2024

Multiplicities of positive and negative pions, kaons and unidentified hadrons from deep-inelastic scattering of muons off a liquid hydrogen target

G. D. Alexeev, M. G. Alexeev, C. Alice +166

The multiplicities of positive and negative pions, kaons and unidentified hadrons produced in deep-inelastic scattering are measured in bins of the Bjorken scaling variable $x$ , th…

cond-mat.str-el2004

Anisotropic Charge Modulation in Ladder Planes of Sr_14-xCa_xCu_24O_41

T. Vuletic, T. Ivek, B. Korin-Hamzic +7

The charge response of the ladders in Sr_14-xCa_xCu_24O_41 is characterized by dc resistivity, low frequency dielectric and optical spectroscopy in all three crystallographic direc…

cond-mat.supr-con2003

Variable-range hopping conductivity in the copper-oxygen chains of La_3Sr_3Ca_8Cu_24O_41

T. Vuletic, B. Korin-Hamzic, S. Tomic +6

We show that the spin chain/ladder compound La_3Sr_3Ca_8Cu_24O_41 is an insulator with hopping transport along the chains. In the temperature range 35 - 280 K, DC conductivity sigm…

cond-mat.mtrl-sci2005

Electronic and vibrational properties of low-dimensional perovskites Sr $_{1 - y}$ La $_{y}$ NbO $_{3.5 - x}$

C. A. Kuntscher, S. Schuppler, P. Haas +4

By angle-resolved photoemission spectroscopy and polarization-dependent infrared reflectivity measurements the electronic and vibrational properties of low-dimensional perovskites…

cond-mat.supr-con2002

Evidence of the superconducting energy gap in the optical spectra of $I^\pm_{t}$ -(BEDT-TTF) $_{2}$ I $_{3}$

N. Drichko, P. Haas, B. Gorshunov +2

The far-infrared in-plane reflectivity of the organic superconductor $I^\pm_{t}$ -(BEDT-TTF) $_{2}$ I $_{3}$ is measured down to frequencies of 10 cm $^{- 1}$ ; the optical conductivity is obt…

cond-mat.supr-con2003

Suppression of the charge-density-wave state in Sr_14Cu_24O_41 by calcium doping

T. Vuletic, B. Korin-Hamzic, S. Tomic +7

The charge response in the spin chain/ladder compound Sr_14-xCa_xCu_24O_41 is characterized by DC resistivity, low-frequency dielectric spectroscopy and optical spectroscopy. We id…

cond-mat.str-el2002

Charge-density wave formation in Sr_{14}Cu_{24}O_{41}

B. Gorshunov, P. Haas, T. RÃµÃµm +6

The electrodynamic response of the spin-ladder compound Sr $_{14 - x}$ Ca $_{x}$ Cu $_{24}$ O $_{41}$ ( $x = 0, 3, 9$ ) has been studied from radiofrequencies up to the infrared. At temperatures…

hep-ex2023

High-statistics measurement of Collins and Sivers asymmetries for transversely polarised deuterons

G. D. Alexeev, M. G. Alexeev, C. Alice +183

New results are presented on a high-statistics measurement of Collins and Sivers asymmetries of charged hadrons produced in deep inelastic scattering of muons on a transversely pol…

cond-mat.str-el2003

Extremely Small Energy Gap in the Quasi-One-Dimensional Conducting Chain Compound SrNbO $_{3.41}$

C. A. Kuntscher, S. Schuppler, P. Haas +7

Resistivity, optical, and angle-resolved photoemission experiments reveal unusual one-dimensional electronic properties of highly anisotropic SrNbO $_{3.41}$ . Along the conducting c…

cond-mat.supr-con2001

Optical measurements of the superconducting gap in MgB2

B. Gorshunov, C. A. Kuntscher, P. Haas +6

Far-infrared reflectivity studies on the polycrystalline intermetallic compound MgB_2 with a superconducting transition temperature T_c=39 K were performed at temperatures 20 K to…