CPV tests with rare kaon decays

被引：0

作者：

Marinova, E. ^{[1
]}

机构：

[1] Ist Nazl Fis Nucl, Sez Perugia, I-06100 Perugia, Italy

来源：

NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS | 2011年 / 210-11卷

关键词：

VIOLATION;

D O I：

10.1016/j.nuclphysbps.2010.12.068

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

The K-S -> pi(+)pi(-)e(+)e(-) decay mode has been investigated using the data collected in 2002 by the NA48/1 collaboration. With about 23k signal events and 59k K-L -> pi(+)pi(-)pi(0)(D) normalization decays, the K-S -> pi(+)pi(-)e(+)e(-) branching ratio was determined. This result is also used to set an upper limit on the presence of E1 direct emission in the decay amplitude. The CP-violating asymmetry has been also measured. We report on measurements of the rare decays K-+/- -> pi(+/-)e(+)e(-) and K-+/- -> pi(+/-)mu(+)mu(-). The full NA48/2 data set was analyzed, leading to more than 7200 reconstructed events in the electronic and more than 3000 events in the muonic channel, the latter exceeding the total existing statistics by a factor of four. For both channels the selected events are almost background-free. From these events, we have determined the branching fraction and form factors of K-+/- -> pi(+/-)e(+)e(-) using different theoretical models. Our results improve the existing world averages significantly. In addition, we measured the CP violating asymmetry between K+ and K- in this channel to be less than a few percent.

引用

页码：173 / 176

页数：4

共 24 条

[11] RARE KAON DECAYS IN THE 1/NC-EXPANSION [J].

BRUNO, C ;

PRADES, J .

ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS, 1993, 57 (04) :585-593

[12] Forward-backward asymmetry in K+→π+l+l- -: art. no. 074029 [J].

Chen, CH ;

Geng, CQ ;

Ho, IL .

PHYSICAL REVIEW D, 2003, 67 (07)

[13]

D'Ambrosio G, 1998, J HIGH ENERGY PHYS

[14]

Dubnicková AZ, 2008, PHYS PART NUCLEI LET, V5, P76, DOI 10.1134/S1547477108020039

[15] RADIATIVE KAON DECAYS AND CP VIOLATION IN CHIRAL PERTURBATION-THEORY [J].

ECKER, G ;

PICH, A ;

DERAFAEL, E .

NUCLEAR PHYSICS B, 1988, 303 (04) :665-702

[16] The beam and detector for the NA48 neutral kaon CP violation experiment at CERN [J].

Fanti, V. ;

Lai, A. ;

Marras, D. ;

Musa, L. ;

Nappi, A. ;

Batley, R. ;

Bevan, A. ;

Dosanjh, R. S. ;

Galik, R. ;

Gershon, T. ;

Hay, B. ;

Kalmus, G. E. ;

Katvars, S. ;

Lazzeroni, C. ;

Moore, R. ;

Munday, D. J. ;

Needham, M. D. ;

Olaiya, E. ;

Parker, M. A. ;

Patel, M. ;

Slater, M. ;

Takach, S. ;

White, To. ;

Wotton, S. A. ;

Bal, E. ;

Barr, G. ;

Bocquet, G. ;

Bremer, J. ;

Brodier-Yourstone, R. ;

Buchholz, P. ;

Burns, M. ;

Ceccucci, A. ;

Clement, M. ;

Cuhadar-Doenzelsmann, T. ;

Cundy, D. ;

Doble, N. ;

Falaleev, V. ;

Formenti, E. ;

Funk, W. ;

Gatignon, L. ;

Gonidec, A. ;

Grafstroem, P. ;

Hallgren, B. ;

Kapusta, P. ;

Kesseler, G. ;

Kubischta, W. ;

Iwanski, W. ;

Lacourt, A. ;

Laverriere, G. ;

Linser, G. .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 2007, 574 (03) :433-471

[17] Rare kaon decays revisited [J].

Friot, S ;

Greynat, D ;

de Rafael, E .

PHYSICS LETTERS B, 2004, 595 :301-308

[18] Long-distance contribution to the forward-backward asymmetry in decays K+→π+l+l- -: art. no. 094030 [J].

Gao, DN .

PHYSICAL REVIEW D, 2004, 69 (09) :6

[19]

Lai A, 2003, EUR PHYS J C, V30, P33, DOI 10.1140/epjc/s2003-01252-y

[20] New measurement of the rare decay K+ → π+μ+μ- [J].

Ma, H ;

Appel, R ;

Atoyan, GS ;

Bassalleck, B ;

Bergman, DR ;

Cheung, N ;

Dhawan, S ;

Do, H ;

Egger, J ;

Eilerts, S ;

Fischer, H ;

Herold, W ;

Issakov, VV ;

Kaspar, H ;

Kraus, DE ;

Lazarus, DM ;

Lichard, P ;

Lowe, J ;

Lozano, J ;

Majid, W ;

Menzel, W ;

Pislak, S ;

Poblaguev, AA ;

Rehak, P ;

Sher, A ;

Thompson, JA ;

Truöl, P ;

Zeller, ME .

PHYSICAL REVIEW LETTERS, 2000, 84 (12) :2580-2583

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