Evidence for a Narrow Baryonic State Decaying to KS0p and KS0p̄ in Deep Inelastic Scattering at HERA

ZEUS Collaboration

doi:10.1016/j.physletb.2004.04.024

Evidence for a Narrow Baryonic State Decaying to K_S⁰p and K_S⁰p̄ in Deep Inelastic Scattering at HERA

ZEUS Collaboration

Department of Physics

Research output: Contribution to journal › Article › peer-review

Abstract

A resonance search has been made in the K0Sp and K0Sp̄ invariant-mass spectrum measured with the ZEUS detector at HERA using an integrated luminosity of 121 pb-1. The search was performed in the central rapidity region of inclusive deep inelastic scattering at an ep centre-of-mass energy of 300-318 GeV for exchanged photon virtuality, Q2, above 1 GeV2. Recent results from fixed-target experiments give evidence for a narrow baryon resonance decaying to K+n and K0Sp, interpreted as a pentaquark. The results presented here support the existence of such state, with a mass of 1521.5±1.5(stat.)+2.8-1.7(syst.) MeV and a Gaussian width consistent with the experimental resolution of 2 MeV. The signal is visible at high Q2 and, for Q2>20 GeV2, contains 221±48 events. The probability of a similar signal anywhere in the range 1500-1560 MeV arising from fluctuations of the background is below 6×10-5.

Original language	American English
Pages (from-to)	7-22
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	591
Issue number	1-2
DOIs	https://doi.org/10.1016/j.physletb.2004.04.024
State	Published - Jul 1 2004

Disciplines

Physics

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Cite this

@article{2f6e5aa2f8ab46eb8a98187b84ffb9b7,

title = "Evidence for a Narrow Baryonic State Decaying to KS0p and KS0{\=p} in Deep Inelastic Scattering at HERA",

abstract = "A resonance search has been made in the K0Sp and K0S{\=p} invariant-mass spectrum measured with the ZEUS detector at HERA using an integrated luminosity of 121 pb-1. The search was performed in the central rapidity region of inclusive deep inelastic scattering at an ep centre-of-mass energy of 300-318 GeV for exchanged photon virtuality, Q2, above 1 GeV2. Recent results from fixed-target experiments give evidence for a narrow baryon resonance decaying to K+n and K0Sp, interpreted as a pentaquark. The results presented here support the existence of such state, with a mass of 1521.5±1.5(stat.)+2.8-1.7(syst.) MeV and a Gaussian width consistent with the experimental resolution of 2 MeV. The signal is visible at high Q2 and, for Q2>20 GeV2, contains 221±48 events. The probability of a similar signal anywhere in the range 1500-1560 MeV arising from fluctuations of the background is below 6×10-5. ",

author = "\{ZEUS Collaboration\} and Mattingly, \{Margarita C. K.\}",

year = "2004",

month = jul,

day = "1",

doi = "10.1016/j.physletb.2004.04.024",

language = "American English",

volume = "591",

pages = "7--22",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

number = "1-2",

}

TY - JOUR

T1 - Evidence for a Narrow Baryonic State Decaying to KS0p and KS0p̄ in Deep Inelastic Scattering at HERA

AU - ZEUS Collaboration

AU - Mattingly, Margarita C. K.

PY - 2004/7/1

Y1 - 2004/7/1

N2 - A resonance search has been made in the K0Sp and K0Sp̄ invariant-mass spectrum measured with the ZEUS detector at HERA using an integrated luminosity of 121 pb-1. The search was performed in the central rapidity region of inclusive deep inelastic scattering at an ep centre-of-mass energy of 300-318 GeV for exchanged photon virtuality, Q2, above 1 GeV2. Recent results from fixed-target experiments give evidence for a narrow baryon resonance decaying to K+n and K0Sp, interpreted as a pentaquark. The results presented here support the existence of such state, with a mass of 1521.5±1.5(stat.)+2.8-1.7(syst.) MeV and a Gaussian width consistent with the experimental resolution of 2 MeV. The signal is visible at high Q2 and, for Q2>20 GeV2, contains 221±48 events. The probability of a similar signal anywhere in the range 1500-1560 MeV arising from fluctuations of the background is below 6×10-5.

AB - A resonance search has been made in the K0Sp and K0Sp̄ invariant-mass spectrum measured with the ZEUS detector at HERA using an integrated luminosity of 121 pb-1. The search was performed in the central rapidity region of inclusive deep inelastic scattering at an ep centre-of-mass energy of 300-318 GeV for exchanged photon virtuality, Q2, above 1 GeV2. Recent results from fixed-target experiments give evidence for a narrow baryon resonance decaying to K+n and K0Sp, interpreted as a pentaquark. The results presented here support the existence of such state, with a mass of 1521.5±1.5(stat.)+2.8-1.7(syst.) MeV and a Gaussian width consistent with the experimental resolution of 2 MeV. The signal is visible at high Q2 and, for Q2>20 GeV2, contains 221±48 events. The probability of a similar signal anywhere in the range 1500-1560 MeV arising from fluctuations of the background is below 6×10-5.

UR - https://digitalcommons.andrews.edu/pubs/2200

U2 - 10.1016/j.physletb.2004.04.024

DO - 10.1016/j.physletb.2004.04.024

M3 - Article

VL - 591

SP - 7

EP - 22

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

IS - 1-2

ER -