Jets in multiparticle production in and beyond geometry of proton-proton collisions at the LHC.

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Title: Jets in multiparticle production in and beyond geometry of proton-proton collisions at the LHC.
Authors: Azarkin, M. Yu., Dremin, I. M., Strikman, M.
Source: Physics Letters B. Jul2014, Vol. 735, p244-249. 6p.
Subjects: Jets (Nuclear physics), Multiparticle spectrometers, Proton-proton interactions, Large Hadron Collider, Nuclear physics experiments, Multiplicity of nuclear particles
Abstract: Experimental findings by CMS on properties of jets and underlying events at high multiplicities in proton-proton interactions at 7 TeV are interpreted as an indication of increasing role of central collisions with small impact parameters. The value of the average impact parameter of the pp collisions as a function of the soft hadron multiplicity is estimated. We find an indication that the rates of different hard processes observed by CMS and ALICE universally depend on the underlying event charged-particle multiplicity until it becomes four times higher than average. It is shown that the increase of the overlap area of colliding protons is not sufficient to explain the rate of jet production in events with charged-particle multiplicity that is more than three times higher than average. New mechanisms are necessary, like interaction of protons in rare configurations of higher than average gluon density. Such mechanisms are not included in the present Monte Carlo event generators. Further studies are proposed. [ABSTRACT FROM AUTHOR]
Copyright of Physics Letters B is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Jets in multiparticle production in and beyond geometry of proton-proton collisions at the LHC.
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  Data: <searchLink fieldCode="AR" term="%22Azarkin%2C+M%2E+Yu%2E%22">Azarkin, M. Yu.</searchLink><br /><searchLink fieldCode="AR" term="%22Dremin%2C+I%2E+M%2E%22">Dremin, I. M.</searchLink><br /><searchLink fieldCode="AR" term="%22Strikman%2C+M%2E%22">Strikman, M.</searchLink>
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  Data: <searchLink fieldCode="JN" term="%22Physics+Letters+B%22">Physics Letters B</searchLink>. Jul2014, Vol. 735, p244-249. 6p.
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  Data: <searchLink fieldCode="DE" term="%22Jets+%28Nuclear+physics%29%22">Jets (Nuclear physics)</searchLink><br /><searchLink fieldCode="DE" term="%22Multiparticle+spectrometers%22">Multiparticle spectrometers</searchLink><br /><searchLink fieldCode="DE" term="%22Proton-proton+interactions%22">Proton-proton interactions</searchLink><br /><searchLink fieldCode="DE" term="%22Large+Hadron+Collider%22">Large Hadron Collider</searchLink><br /><searchLink fieldCode="DE" term="%22Nuclear+physics+experiments%22">Nuclear physics experiments</searchLink><br /><searchLink fieldCode="DE" term="%22Multiplicity+of+nuclear+particles%22">Multiplicity of nuclear particles</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: Experimental findings by CMS on properties of jets and underlying events at high multiplicities in proton-proton interactions at 7 TeV are interpreted as an indication of increasing role of central collisions with small impact parameters. The value of the average impact parameter of the pp collisions as a function of the soft hadron multiplicity is estimated. We find an indication that the rates of different hard processes observed by CMS and ALICE universally depend on the underlying event charged-particle multiplicity until it becomes four times higher than average. It is shown that the increase of the overlap area of colliding protons is not sufficient to explain the rate of jet production in events with charged-particle multiplicity that is more than three times higher than average. New mechanisms are necessary, like interaction of protons in rare configurations of higher than average gluon density. Such mechanisms are not included in the present Monte Carlo event generators. Further studies are proposed. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Physics Letters B is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.physletb.2014.06.040
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      – Code: eng
        Text: English
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        PageCount: 6
        StartPage: 244
    Subjects:
      – SubjectFull: Jets (Nuclear physics)
        Type: general
      – SubjectFull: Multiparticle spectrometers
        Type: general
      – SubjectFull: Proton-proton interactions
        Type: general
      – SubjectFull: Large Hadron Collider
        Type: general
      – SubjectFull: Nuclear physics experiments
        Type: general
      – SubjectFull: Multiplicity of nuclear particles
        Type: general
    Titles:
      – TitleFull: Jets in multiparticle production in and beyond geometry of proton-proton collisions at the LHC.
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              Text: Jul2014
              Type: published
              Y: 2014
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              Value: 735
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