Search for D0-(D)over-bar0 mixing and doubly-Cabibbo-suppressed decays of the D0 in hadronic final states

被引：53

作者：

Aitala, EM ^{[1
]}

Amato, S

Anjos, JC

Appel, JA

Ashery, D

Banerjee, S

Bediaga, I

Blaylock, G

Bracker, SB

Burchat, PR

Burnstein, RA

Carter, T

Carvalho, HS

Copty, NK

Cremaldi, LM

Darling, C

Fernandez, A

Gagnon, P

Gobel, C

Gounder, K

Halling, AM

Herrera, G

Hurvits, G

James, C

Kasper, PA

Kwan, S

Langs, DC

Leslie, J

Lundberg, B

MayTal-Beck, S

Meadows, B

Neto, JRTD

Milburn, RH

de Miranda, JM

Napier, A

Nguyen, A

d'Oliveira, AB

O'Shaughnessy, K

Peng, KC

Perera, LP

Purohit, MV

Quinn, B

Radeztsky, S

Rafatian, A

Reay, NW

Reidy, JJ

dos Reis, AC

Rubin, HA

Santha, PKS

Santoro, AFS

机构：

[1] Ctr Brasileiro Pesquisas Fis, Rio De Janeiro, Brazil

[2] Univ Calif Santa Cruz, Santa Cruz, CA 95064 USA

[3] Univ Cincinnati, Cincinnati, OH 45221 USA

[4] CINVESTAV, Mexico City 14000, DF, Mexico

[5] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA

[6] Illinois Inst Technol, Chicago, IL 60616 USA

[7] Kansas State Univ, Manhattan, KS 66506 USA

[8] Univ Massachusetts, Amherst, MA 01003 USA

[9] Univ Mississippi, University, MS 38677 USA

[10] Ohio State Univ, Columbus, OH 43210 USA

[11] Princeton Univ, Princeton, NJ 08544 USA

[12] Univ Autonoma Puebla, Puebla 72570, Mexico

[13] Univ S Carolina, Columbia, SC 29208 USA

[14] Stanford Univ, Stanford, CA 94305 USA

[15] Tel Aviv Univ, IL-69978 Tel Aviv, Israel

[16] Tufts Univ, Medford, MA 02155 USA

[17] Univ Wisconsin, Madison, WI 53706 USA

[18] Yale Univ, New Haven, CT 06511 USA

来源：

PHYSICAL REVIEW D | 1998年 / 57卷 / 01期

关键词：

D O I：

10.1103/PhysRevD.57.13

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present results of a search for D-0-(D) over bar(0) mixing and doubly-Cabibbo-suppressed decays of the D-0 in Fermilab experiment E791, a fixed-target charm hadroproduction experiment. We look for evidence of mixing in the decay chain D* --> pi D--> pi(K pi or K pi pi pi). If the charge of the pion from the D* decay is the same as the charge of the kaon from the D decay (a "wrong-sign" event), mixing may have occurred. Mixing can be distinguished from other sources of wrong-sign events (such as doubly-Cabibbo-suppressed decays) by analyzing the distribution of decay times. We see no evidence of mixing. Allowing for CP violation in the interference between DCS and mixing amplitudes our fitted ratio for mixed to unmixed decay rates is r(mix) = (0.39(-0.32)(+0.36)+/-0.16)%. This corresponds to a 90% C.L. upper limit of r(mix)<0.85%. The sensitivity of this is comparable to that of previous measurements, but the assumptions made in fitting the data are notably more general. We present results from many fits to our data under Various assumptions. If we assume r(mix) = 0, we find a two-sigma wrong-sign enhancement in the K pi mode which we ascribe to doubly Cabibbo-suppressed decays. The ratios of doubly Cabibbo-suppressed decays to Cabibbo-favored decays are r(dcs) (K pi) = (0.68(-0.33)(+0.34)+/-0.07)% and r(dcs)(K pi pi pi) = (0.25(-0.34)(+0.36)+/-0.03)%. [S0556-2821(98)01103-5].

引用

页码：13 / 27

页数：15

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