Date

Subject_areas

Event shapes in deep inelastic scattering at HERA

The ZEUS collaboration Chekanov, S. ; Derrick, M. ; Magill, S. ; et al.
Nucl.Phys. B767 (2007) 1-28, 2007.
Inspire Record 714503 DOI 10.17182/hepdata.11818

Mean values and differential distributions of event-shape variables have been studied in neutral current deep inelastic scattering using an integrated {luminosity} of 82.2 pb$^{-1}$ collected with the ZEUS detector at HERA. The kinematic range was $80 < Q^2 < 20 480\gev^2$ and $0.0024 < x < 0.6$, where $Q^2$ is the virtuality of the exchanged boson and $x$ is the Bjorken variable. The data are compared with a model based on a combination of next-to-leading-order QCD calculations with next-to-leading-logarithm corrections and the Dokshitzer-Webber non-perturbative power corrections. The power-correction method provides a reasonable description of the data for all event-shape variables studied. Nevertheless, the lack of consistency of the determination of $\alpha_s$ and of the non-perturbative parameter of the model, $\albar$, suggests the importance of higher-order processes that are not yet included in the model.

69 data tables

Mean value of the event shape variable 1-THRUST(C=T).

Mean value of the event shape variable B(C=T).

Mean value of the event shape variable RHO**2.

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Measurement of event shapes in deep inelastic scattering at HERA

The ZEUS collaboration Chekanov, S. ; Krakauer, D. ; Loizides, J.H. ; et al.
Eur.Phys.J. C27 (2003) 531-545, 2003.
Inspire Record 602252 DOI 10.17182/hepdata.46536

Inclusive event-shape variables have been measured in the current region of the Breit frame for neutral current deep inelastic ep scattering using an integrated luminosity of 45.0 pb^-1 collected with the ZEUS detector at HERA. The variables studied included thrust, jet broadening and invariant jet mass. The kinematic range covered was 10 < Q^2 < 20,480 GeV^2 and 6.10^-4 < x < 0.6, where Q^2 is the virtuality of the exchanged boson and x is the Bjorken variable. The Q dependence of the shape variables has been used in conjunction with NLO perturbative calculations and the Dokshitzer-Webber non-perturbative corrections (`power corrections') to investigate the validity of this approach.

6 data tables

Mean value of the event shape variables 1-THRUST(C=T) in different Q**2 and X bins.

Mean value of the event shape variables B(C=T) in different Q**2 and X bins.

Mean value of the event shape variables RHO**2 in different Q**2 and X bins.

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Determination of $alpha_s$ from hadronic event shapes in $e^{+} e^{-}$ annihilation at 192-GeV <= $\sqrt{s}$ <= 208-GeV

The L3 collaboration Achard, P. ; Adriani, O. ; Aguilar-Benitez, M. ; et al.
Phys.Lett. B536 (2002) 217-228, 2002.
Inspire Record 586115 DOI 10.17182/hepdata.49741

Results are presented from a study of the structure of high energy hadronic events recorded by the L3 detector at sqrt(s)>192 GeV. The distributions of several event shape variables are compared to resummed O(alphaS^2) QCD calculations. We determine the strong coupling constant at three average centre-of-mass energies: 194.4, 200.2 and 206.2 GeV. These measurements, combined with previous L3 measurements at lower energies, demonstrate the running of alphaS as expected in QCD and yield alphaS(mZ) = 0.1227 +- 0.0012 +- 0.0058, where the first uncertainty is experimental and the second is theoretical.

9 data tables

The measured ALPHA_S at three centre-of-mass energies from fits to the individual event shape distributions. The first error is statistcal, the first DSYS error is the experimental systematic uncertainty, and the second DSYS error is the theoryuncertainty.

Updated ALPHA_S measurements from the BT, BW and C-Parameter distributions,from earlier L3 data at lower centre-of-mass energies.. The first error is the total experimental error (stat+sys in quadrature) and the DSYS error is the theory uncertainty.

Combined ALPHA_S values from the five event shape variables. The first error is statistical, the first DSYS error is the experimental systematic uncertainity, the second DSYS error is the uncertainty from the hadronisdation models, andthethird DSYS errpr is the uncertainty due to uncalculated higher orders in the QCDpredictions.

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Properties of hadronic final states in diffractive deep inelastic ep scattering at HERA

The ZEUS collaboration Chekanov, S. ; Derrick, M. ; Krakauer, D. ; et al.
Phys.Rev. D65 (2002) 052001, 2002.
Inspire Record 560352 DOI 10.17182/hepdata.46869

Characteristics of the hadronic final state of diffractive deep inelastic scattering events, ep -> eXp, were studied in the kinematic range 4 < M_X < 35 GeV, 4 < Q^2 < 150 GeV^2, 70 < W < 250 GeV and 0.0003 < x_pom < 0.03 with the ZEUS detector at HERA using an integrated luminosity of 13.8 pb^{-1}. The events were tagged by identifying the diffractively scattered proton using the leading proton spectrometer. The properties of the hadronic final state, X, were studied in its center-of-mass frame using thrust, thrust angle, sphericity, energy flow, transverse energy flow and ``seagull'' distributions. As the invariant mass of the system increases, the final state becomes more collimated, more aligned and more asymmetric in the average transverse momentum with respect to the direction of the virtual photon. Comparisons of the properties of the hadronic final state with predictions from various Monte Carlo model generators suggest that the final state is dominated by qqg states at the parton level.

16 data tables

Thrust distribution for a DIS hadronic final state mass between 11 and 17.8GeV.

Thrust distribution for a DIS hadronic final state mass between 17.8 and 27.7 GeV.

Sphericity distribution for a DIS hadronic final state mass between 11 and 17.8 GeV.

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Precision measurement of scaled momentum, charge multiplicity and thrust in (muon)neutrino N and (muon)anti-neutrino interactions

The NOMAD collaboration Altegoer, J. ; Angelini, C. ; Astier, P. ; et al.
Phys.Lett. B445 (1999) 439-448, 1999.
Inspire Record 480555 DOI 10.17182/hepdata.49314
1 data table

Average neutrino energy. Peak postion of distribution on log(1/z) is presented.


QCD studies and determination of alpha-s in e+ e- collisions at s**(1/2) = 161-GeV and 172-GeV

The L3 collaboration Acciarri, M. ; Adriani, O. ; Aguilar-Benitez, M. ; et al.
Phys.Lett. B404 (1997) 390-402, 1997.
Inspire Record 443563 DOI 10.17182/hepdata.47483
8 data tables

No description provided.

Average jet multiplicity using JADE algorithm.

Average jet multiplicity using Durham algorithm.

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Thrust jet analysis of deep inelastic large rapidity gap events

The H1 collaboration Adloff, C. ; Aid, S. ; Anderson, M. ; et al.
Eur.Phys.J. C1 (1998) 495-507, 1998.
Inspire Record 451036 DOI 10.17182/hepdata.44396

A thrust analysis of Large-Rapidity-Gap events in deep-inelastic ep collisions is presented, using data taken with the H1 detector at HERA in 1994. The average thrust of the final states X, which emerge from the dissociation of virtual photons in the range 10 < Q2 < 100 GeV2, grows with hadronic mass M_X and implies a dominant 2-jet topology. Thrust is found to decrease with growing Pt, the thrust jet momentum transverse to the photon-proton collision axis. Distributions of Pt2 are consistent with being independent of MX. They show a strong alignment of the thrust axis with the photon-proton collision axis, and have a large high-Pt tail. The correlation of thrust with MX is similar to that in e+e- annihilation at sqrt(see)=MX, but with lower values of thrust in the ep data. The data cannot be described by interpreting the dissociated system X as a qqbar state but inclusion of a substantial fraction of qqbarg parton configurations leads naturally to the observed properties. The soft colour exchange interaction model does not describe the data.

7 data tables

PT distribution of the photon-originated jet relative to the to the GAMMA* P collision axis in the jet center-of-mass frame, divided by the total GAMMA* P cross section for the respective M_x bin. Jet momentum defined as vector sum of momenta in the positive(negative) thrust hemisphere (thrust jet momentum).

PT distribution of the photon-originated jet relative to the to the GAMMA* P collision axis in the jet center-of-mass frame, divided by the total GAMMA* P cross section for the respective M_x bin. Jet momentum defined as vector sum of momenta in the positive(negative) thrust hemisphere (thrust jet momentum).

PT distribution of the photon-originated jet relative to the to the GAMMA* P collision axis in the jet center-of-mass frame, divided by the total GAMMA* P cross section for the respective M_x bin. Jet momentum defined as vector sum of momenta in the positive(negative) thrust hemisphere (thrust jet momentum).

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Measurement of event shape variables in deep inelastic e p scattering

The H1 collaboration Adloff, C. ; Aid, S. ; Anderson, M. ; et al.
Phys.Lett. B406 (1997) 256-270, 1997.
Inspire Record 443753 DOI 10.17182/hepdata.23948

Deep inelastic e^+ scattering data, taken with the H1 detector at HERA, are used to study the event shape variables thrust, jet broadening and jet mass in the current hemisphere of the Breit frame over a large range of momentum transfers Q between 7 GeV and 100 GeV. The data are compared with results from e^+e^- experiments. Using second order QCD calculations and an approach to relate hadronisation effects to power corrections an analysis of the Q dependences of the means of the event shape parameters is presented, from which both the power corrections and the strong coupling constant are determined without any assumption on fragmentation models. The power corrections of all event shape variables investigated follow a 1/Q behaviour and can be described by a common parameter alpha_0.

6 data tables

The data on the differential event shape distrubutions are shown only as a illustration to show the agreement with the Lepto and pQCD calculations and contain only statistical errors. The authors are preparing another paper which details these differential distributions including full point-to-point systematics.

Usual definition of Thrust.

The same as usual thrust definition but with the thrust axis replaced by the current hemisphere axis (0,0,-1), where positive Z direction coincide with theincoming proton beam direction.

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Study of hadronic events and measurements of alpha-s between 30-GeV and 91-GeV

The L3 collaboration Acciarri, M. ; Adriani, O. ; Aguilar-Benitez, M. ; et al.
Phys.Lett. B411 (1997) 339-353, 1997.
Inspire Record 445998 DOI 10.17182/hepdata.47465
6 data tables

No description provided.

No description provided.

No description provided.

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Study of the structure of hadronic events and determination of alpha-s at s**(1/2) = 130-GeV and 136-GeV

The L3 collaboration Acciarri, M. ; Adam, A. ; Adriani, O. ; et al.
Phys.Lett. B371 (1996) 137-148, 1996.
Inspire Record 404916 DOI 10.17182/hepdata.48010
3 data tables

Mean values of the event shape variables.

Mean charged particle multiplicity.

The value of alpha_s from the fits to the event shape variables : thrust (THRUST), scale heavy jet mass (MH**2/S), total jet broadening (BT)and wide jet broadening (BW). The last value is combined result (COMBINED). The second systematic error is due to uncertainties in the theory.


Experimental study of b quark jets in e+ e- annihilation at TRISTAN

The TOPAZ collaboration Nagai, K. ; Enomoto, R. ; Abe, T. ; et al.
Phys.Lett. B278 (1992) 506-510, 1992.
Inspire Record 333342 DOI 10.17182/hepdata.29230
4 data tables

No description provided.

No description provided.

Mean values of jet properties for b-jet sample.

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Measurement of alpha-s from the structure of particle clusters produced in hadronic Z decays

The ALEPH collaboration Decamp, D. ; Deschizeaux, B. ; Goy, C. ; et al.
Phys.Lett. B257 (1991) 479-491, 1991.
Inspire Record 302771 DOI 10.17182/hepdata.29466
2 data tables

No description provided.

Error contains both experimental and theoretical errors.


First Measurements of Hadronic Decays of the $Z$ Boson

The MARK-II collaboration Abrams, G.S. ; Adolphsen, Chris ; Aleksan, R. ; et al.
Phys.Rev.Lett. 63 (1989) 1558, 1989.
Inspire Record 282670 DOI 10.17182/hepdata.20044
5 data tables

Corrected event shape distributions.

Corrected event shape distributions.

Corrected event shape distributions.

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Comparison of Light Quark and Charm Quark Fragmentation

Kesten, P. ; Akerlof, C. ; Bonvicini, G. ; et al.
Phys.Lett. B161 (1985) 412-416, 1985.
Inspire Record 17116 DOI 10.17182/hepdata.30349
3 data tables

Charm Quark Jet Trigger. Characteristics of Jet Opposite the Trigger Jet.

Light Quark Jet Trigger. Characteristics of Jet Opposite the Trigger Jet.

No description provided.


Observation of Planar Three Jet Events in e+ e- Annihilation and Evidence for Gluon Bremsstrahlung

The JADE collaboration Bartel, W. ; Canzler, T. ; Cords, D. ; et al.
Phys.Lett. B91 (1980) 142-147, 1980.
Inspire Record 143985 DOI 10.17182/hepdata.6339
2 data tables

THRUST AND PLANARITY DISTRIBUTIONS. FINAL (BETTER) THRUST DISTRIBUTIONS WITH DETECTOR CORRECTIONS TO BE PUBLISHED LATER.

No description provided.


Tests of Quantum Chromodynamics and a Direct Measurement of the Strong Coupling Constant $\alpha_S$ at $\sqrt{s}=30$-{GeV}

Barber, D.P. ; Becker, U. ; Benda, H. ; et al.
Phys.Lett. B89 (1979) 139-144, 1979.
Inspire Record 143680 DOI 10.17182/hepdata.6483
2 data tables

OBLATENESS AND THRUST DISTRIBUTIONS FOR NARROW AND BROAD JETS AT 30 GEV. THESE DATA ARE SOMEWHAT ANALYSIS AND DETECTOR DEPENDENT.

No description provided.


Study of Quark Fragmentation at 29-GeV: Global Jet Parameters and Single Particle Distributions

Bender, D. ; Derrick, M. ; Fernandez, E. ; et al.
Phys.Rev. D31 (1985) 1, 1985.
Inspire Record 201482 DOI 10.17182/hepdata.23581
25 data tables

New values supplied 6.7.87 by M.Derrick.

No description provided.

New values supplied 6.7.87 by M. Derrick.

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Jet Production and Fragmentation in e+ e- Annihilation at 12-GeV to 43-GeV

The TASSO collaboration Althoff, M. ; Braunschweig, W. ; Kirschfink, F.J. ; et al.
Z.Phys. C22 (1984) 307-340, 1984.
Inspire Record 195333 DOI 10.17182/hepdata.16272
14 data tables

R VALUES BELOW 32.5 GEV ARE IDENTICAL TO THOSE GIVEN IN BRANDELIK ET AL., PL 113B, 499 (1982).

No description provided.

CHARGED PARTICLE MULTIPLICITY DISTRIBUTIONS.

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Measurement of Inclusive $\gamma$ and $\pi^0$ Spectra and a Comparison of the Neutral and Charged Components in Hadronic Events in $e^+ e^-$ Annihilation at 34-{GeV}

The CELLO collaboration Behrend, H.J. ; Chen, C. ; Fenner, H. ; et al.
Z.Phys. C14 (1982) 189, 1982.
Inspire Record 177212 DOI 10.17182/hepdata.16411
2 data tables

No description provided.

No description provided.


THRUST DISTRIBUTIONS AND DECAYS OF THE UPSILON BOUND STATES

Peterson, D. ; Bohringer, T. ; Franzini, P. ; et al.
Phys.Lett. B114 (1982) 277-281, 1982.
Inspire Record 181188 DOI 10.17182/hepdata.30893
5 data tables

No description provided.

No description provided.

No description provided.

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SEARCH FOR STRUCTURE IN SIGMA (E+ E- ---> HADRONS) BETWEEN S**(1/2) = 10.34-GEV AND 11.6-GEV

Rice, E. ; Bohringer, T. ; Franzini, P. ; et al.
Phys.Rev.Lett. 48 (1982) 906-910, 1982.
Inspire Record 180613 DOI 10.17182/hepdata.20593
4 data tables

UNCORRECTED VALUES OF R.

UNCORRECTED R VALUES BELOW AND ABOVE UPSI(10.5).

FULLY CORRECTED R VALUES, ASSUMING B AB PRODUCTION IS TOTALLY RESPONSIBLE FOR THE EXCESS ABOVE UPSI(10.5).

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TOPOLOGY AND CHARGED MULTIPLICITY OF HADRONIC EVENTS IN THE ENERGY REGION OF THE UPSILON AND UPSILON' RESONANCES. (IN GERMAN)

Schwarz, Andreas S. ;
PhD Thesis, 1981.
Inspire Record 171276 DOI 10.17182/hepdata.43836
2 data tables

OBSERVED, UNCORRECTED, AVERAGE VALUES FOR SPHERICITY AND THRUST.

AVERAGE CHARGED MULTIPLICITY - SEE B. NICZYPORUK ET AL., ZP C9, 1 (1981).


PHYSICS WITH HIGH-ENERGY ELECTRON POSITRON COLLIDING BEAMS WITH THE MARK-J DETECTOR

The MARK-J AACHEN-DESY-MIT-NIKHEF-BEIJING collaborations Barber, D.P. ; Becker, U. ; Benda, H. ; et al.
Phys.Rept. 63 (1980) 337-391, 1980.
Inspire Record 158857 DOI 10.17182/hepdata.27618
4 data tables

SUMMARY OF RESULTS FOR R FROM TOTAL OF 2595 HADRON EVENTS. INCLUDES RED = 1046, 1079, 1072 AND 1114.

MEAN THRUST AND THRUST DISTRIBUTION (1/N)*DN/DTHRUST AT 13, 17, 22 AND 30 GEV. SOMEWHAT DETECTOR DEPENDENT. INCLUDES RED = 1079 AND 1072. SEE ALSO RED = 1114. ALSO JET ANALYSIS USING FOX-WOLFRAM MOMENTS.

OBLATENESS DISTRIBUTION AT 17 AND 27.4 TO 31.6 GEV. SEE RED = 1146.

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Search for the Production of a New Quark Flavor at the Highest {PETRA} Energies

Barber, D.P. ; Becker, U. ; Benda, H. ; et al.
Phys.Rev.Lett. 44 (1980) 1722, 1980.
Inspire Record 152616 DOI 10.17182/hepdata.20702
3 data tables

No description provided.

ENERGY SCAN IN 20 MEV STEPS.

THRUST DISTRIBUTION (1/N)*DN/DTHRUST AT 29.9 TO 31.6 AND 35 GEV. THESE DATA ARE RATHER DETECTOR DEPENDENT.


Study of Electron - Positron Collisions at the Center-of-mass Energies of 27.4-{GeV} and 27.7-{GeV} at {PETRA}

Barber, D.P. ; Becker, U. ; Benda, H. ; et al.
Phys.Rev.Lett. 43 (1979) 901, 1979.
Inspire Record 141542 DOI 10.17182/hepdata.20739
2 data tables

THE RELATIVE VALUE OF R BETWEEN THESE TWO ENERGIES IS 1.0 +- 0.2.

THRUST DISTRIBUTION (1/N)*DN/DTHRUST AT 13, 17 AND 27 GEV. THESE DATA ARE RATHER DETECTOR DEPENDENT.